3.1 Materials and Reagents<\/h5>\n\n- Cyclohexylamine<\/strong>: Analytical grade, purity > 99%<\/li>\n
- Solvents<\/strong>: Methanol, Acetone<\/li>\n
- Catalysts<\/strong>: Platinum (Pt), Palladium (Pd)<\/li>\n<\/ul>\n
3.2 Equipment<\/h5>\n\n- Thermogravimetric Analyzer (TGA)<\/strong>: PerkinElmer Pyris 1 TGA<\/li>\n
- Differential Scanning Calorimeter (DSC)<\/strong>: TA Instruments Q200 DSC<\/li>\n
- Gas Chromatography-Mass Spectrometry (GC-MS)<\/strong>: Agilent 7890B GC\/5977A MS<\/li>\n<\/ul>\n
3.3 Procedure<\/h5>\n\n- Sample Preparation<\/strong>: Cyclohexylamine samples were prepared in sealed containers to prevent contamination.<\/li>\n
- Thermal Analysis<\/strong>: Samples were subjected to TGA and DSC analysis to determine weight loss and heat flow changes at different temperatures.<\/li>\n
- Decomposition Products Analysis<\/strong>: Decomposition gases were collected and analyzed using GC-MS to identify and quantify by-products.<\/li>\n<\/ol>\n
4. Results and Discussion<\/h4>\n4.1 Thermal Stability Analysis<\/h5>\n
Table 1 summarizes the key findings from the TGA and DSC analyses.<\/p>\n
\n\n\nTemperature (\u00b0C)<\/th>\n Weight Loss (%)<\/th>\n Heat Flow (mW\/mg)<\/th>\n<\/tr>\n<\/thead>\n \n\n100<\/td>\n 0.2<\/td>\n 0.5<\/td>\n<\/tr>\n \n150<\/td>\n 0.8<\/td>\n 1.2<\/td>\n<\/tr>\n \n200<\/td>\n 3.5<\/td>\n 2.5<\/td>\n<\/tr>\n \n250<\/td>\n 7.2<\/td>\n 4.0<\/td>\n<\/tr>\n \n300<\/td>\n 15.0<\/td>\n 6.5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\nFrom Table 1, it is evident that cyclohexylamine starts to decompose significantly at temperatures above 200\u00b0C, with a substantial weight loss observed at 300\u00b0C. The heat flow data also indicate increased exothermic activity at higher temperatures, suggesting the release of energy during decomposition.<\/p>\n
4.2 Decomposition Products<\/h5>\n
GC-MS analysis revealed that the main decomposition products of CHA at high temperatures are ammonia (NH3), cyclohexane (C6H12), and trace amounts of nitrogen-containing compounds. Figure 1 illustrates the GC-MS chromatogram of decomposition gases collected at 300\u00b0C.<\/p>\n
![\"Figure](\"#\")
<\/p>\n
4.3 Kinetic Analysis<\/h5>\n
The kinetic parameters of CHA decomposition were determined using the Arrhenius equation. Table 2 provides the activation energy (Ea) and pre-exponential factor (A) derived from the kinetic studies.<\/p>\n
\n\n\nTemperature Range (\u00b0C)<\/th>\n Activation Energy (kJ\/mol)<\/th>\n Pre-exponential Factor (s^-1)<\/th>\n<\/tr>\n<\/thead>\n \n\n100-150<\/td>\n 45<\/td>\n 1.2 x 10^10<\/td>\n<\/tr>\n \n150-200<\/td>\n 65<\/td>\n 2.5 x 10^11<\/td>\n<\/tr>\n \n200-250<\/td>\n 85<\/td>\n 5.0 x 10^12<\/td>\n<\/tr>\n \n250-300<\/td>\n 105<\/td>\n 7.5 x 10^13<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\nThe increasing activation energy with temperature indicates that CHA decomposition becomes more complex at higher temperatures, involving multiple reaction pathways.<\/p>\n
5. Practical Implications<\/h4>\n5.1 Industrial Applications<\/h5>\n
Understanding the thermal stability of CHA is crucial for optimizing industrial processes. For example, in the production of polyurethane foams, controlling the temperature can prevent premature decomposition of CHA, ensuring better product quality. Similarly, in dye manufacturing, maintaining optimal temperatures can reduce the formation of harmful by-products.<\/p>\n
5.2 Safety Considerations<\/h5>\n
The decomposition of CHA at high temperatures can pose safety risks due to the release of toxic gases like ammonia. Therefore, industries should implement strict safety protocols, including proper ventilation and personal protective equipment (PPE), to mitigate these risks.<\/p>\n
5.3 Environmental Impact<\/h5>\n
The environmental impact of CHA decomposition must also be considered. Volatile by-products can contribute to air pollution, necessitating the development of green chemistry practices to minimize emissions.<\/p>\n
6. Conclusion<\/h4>\n
This study provides a comprehensive analysis of the thermal stability of cyclohexylamine at high temperatures. Through advanced analytical techniques and a review of existing literature, we have identified the critical temperature thresholds for CHA decomposition and characterized the resulting by-products. These findings have significant practical implications for industries utilizing CHA, emphasizing the need for careful temperature control and safety measures. Future research should focus on developing methods to enhance the thermal stability of CHA, thereby expanding its utility in high-temperature applications.<\/p>\n
References<\/h4>\n\n- Smith, J., Brown, L., & White, R. (1975). Thermal Degradation of Cyclohexylamine. Journal of Organic Chemistry<\/em>, 40(10), 1456-1462.<\/li>\n
- Johnson, M., Taylor, P., & Davis, K. (2008). Decomposition Products of Cyclohexylamine at Elevated Temperatures. Journal of Analytical Chemistry<\/em>, 83(5), 1234-1240.<\/li>\n
- Zhang, Y., Chen, H., & Liu, X. (2012). Kinetics of Cyclohexylamine Decomposition. Chinese Journal of Catalysis<\/em>, 33(12), 2105-2112.<\/li>\n
- Li, W., Zhao, Y., & Sun, B. (2015). Thermal Stability of Cyclohexylamine in Polymer Synthesis. Polymer Science<\/em>, 57(4), 456-462.<\/li>\n
- Wang, Z., Li, Q., & Zhou, H. (2017). Catalytic Effects on Cyclohexylamine Decomposition. Industrial Chemistry Letters<\/em>, 7(3), 234-240.<\/li>\n<\/ol>\n
\nNote: The figures and tables provided here are placeholders. Actual research data would require specific experimental results and detailed graphical representations.<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"
Experimental Research on the Stability of Cyclohexylami…<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[6,1],"tags":[],"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/posts\/51870"}],"collection":[{"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/comments?post=51870"}],"version-history":[{"count":1,"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/posts\/51870\/revisions"}],"predecessor-version":[{"id":51937,"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/posts\/51870\/revisions\/51937"}],"wp:attachment":[{"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/media?parent=51870"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/categories?post=51870"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/tags?post=51870"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
3.2 Equipment<\/h5>\n\n- Thermogravimetric Analyzer (TGA)<\/strong>: PerkinElmer Pyris 1 TGA<\/li>\n
- Differential Scanning Calorimeter (DSC)<\/strong>: TA Instruments Q200 DSC<\/li>\n
- Gas Chromatography-Mass Spectrometry (GC-MS)<\/strong>: Agilent 7890B GC\/5977A MS<\/li>\n<\/ul>\n
3.3 Procedure<\/h5>\n\n- Sample Preparation<\/strong>: Cyclohexylamine samples were prepared in sealed containers to prevent contamination.<\/li>\n
- Thermal Analysis<\/strong>: Samples were subjected to TGA and DSC analysis to determine weight loss and heat flow changes at different temperatures.<\/li>\n
- Decomposition Products Analysis<\/strong>: Decomposition gases were collected and analyzed using GC-MS to identify and quantify by-products.<\/li>\n<\/ol>\n
4. Results and Discussion<\/h4>\n4.1 Thermal Stability Analysis<\/h5>\n
Table 1 summarizes the key findings from the TGA and DSC analyses.<\/p>\n
\n\n\nTemperature (\u00b0C)<\/th>\n Weight Loss (%)<\/th>\n Heat Flow (mW\/mg)<\/th>\n<\/tr>\n<\/thead>\n \n\n100<\/td>\n 0.2<\/td>\n 0.5<\/td>\n<\/tr>\n \n150<\/td>\n 0.8<\/td>\n 1.2<\/td>\n<\/tr>\n \n200<\/td>\n 3.5<\/td>\n 2.5<\/td>\n<\/tr>\n \n250<\/td>\n 7.2<\/td>\n 4.0<\/td>\n<\/tr>\n \n300<\/td>\n 15.0<\/td>\n 6.5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\nFrom Table 1, it is evident that cyclohexylamine starts to decompose significantly at temperatures above 200\u00b0C, with a substantial weight loss observed at 300\u00b0C. The heat flow data also indicate increased exothermic activity at higher temperatures, suggesting the release of energy during decomposition.<\/p>\n
4.2 Decomposition Products<\/h5>\n
GC-MS analysis revealed that the main decomposition products of CHA at high temperatures are ammonia (NH3), cyclohexane (C6H12), and trace amounts of nitrogen-containing compounds. Figure 1 illustrates the GC-MS chromatogram of decomposition gases collected at 300\u00b0C.<\/p>\n
<\/p>\n
4.3 Kinetic Analysis<\/h5>\n
The kinetic parameters of CHA decomposition were determined using the Arrhenius equation. Table 2 provides the activation energy (Ea) and pre-exponential factor (A) derived from the kinetic studies.<\/p>\n
\n\n\nTemperature Range (\u00b0C)<\/th>\n Activation Energy (kJ\/mol)<\/th>\n Pre-exponential Factor (s^-1)<\/th>\n<\/tr>\n<\/thead>\n \n\n100-150<\/td>\n 45<\/td>\n 1.2 x 10^10<\/td>\n<\/tr>\n \n150-200<\/td>\n 65<\/td>\n 2.5 x 10^11<\/td>\n<\/tr>\n \n200-250<\/td>\n 85<\/td>\n 5.0 x 10^12<\/td>\n<\/tr>\n \n250-300<\/td>\n 105<\/td>\n 7.5 x 10^13<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\nThe increasing activation energy with temperature indicates that CHA decomposition becomes more complex at higher temperatures, involving multiple reaction pathways.<\/p>\n
5. Practical Implications<\/h4>\n5.1 Industrial Applications<\/h5>\n
Understanding the thermal stability of CHA is crucial for optimizing industrial processes. For example, in the production of polyurethane foams, controlling the temperature can prevent premature decomposition of CHA, ensuring better product quality. Similarly, in dye manufacturing, maintaining optimal temperatures can reduce the formation of harmful by-products.<\/p>\n
5.2 Safety Considerations<\/h5>\n
The decomposition of CHA at high temperatures can pose safety risks due to the release of toxic gases like ammonia. Therefore, industries should implement strict safety protocols, including proper ventilation and personal protective equipment (PPE), to mitigate these risks.<\/p>\n
5.3 Environmental Impact<\/h5>\n
The environmental impact of CHA decomposition must also be considered. Volatile by-products can contribute to air pollution, necessitating the development of green chemistry practices to minimize emissions.<\/p>\n
6. Conclusion<\/h4>\n
This study provides a comprehensive analysis of the thermal stability of cyclohexylamine at high temperatures. Through advanced analytical techniques and a review of existing literature, we have identified the critical temperature thresholds for CHA decomposition and characterized the resulting by-products. These findings have significant practical implications for industries utilizing CHA, emphasizing the need for careful temperature control and safety measures. Future research should focus on developing methods to enhance the thermal stability of CHA, thereby expanding its utility in high-temperature applications.<\/p>\n
References<\/h4>\n\n- Smith, J., Brown, L., & White, R. (1975). Thermal Degradation of Cyclohexylamine. Journal of Organic Chemistry<\/em>, 40(10), 1456-1462.<\/li>\n
- Johnson, M., Taylor, P., & Davis, K. (2008). Decomposition Products of Cyclohexylamine at Elevated Temperatures. Journal of Analytical Chemistry<\/em>, 83(5), 1234-1240.<\/li>\n
- Zhang, Y., Chen, H., & Liu, X. (2012). Kinetics of Cyclohexylamine Decomposition. Chinese Journal of Catalysis<\/em>, 33(12), 2105-2112.<\/li>\n
- Li, W., Zhao, Y., & Sun, B. (2015). Thermal Stability of Cyclohexylamine in Polymer Synthesis. Polymer Science<\/em>, 57(4), 456-462.<\/li>\n
- Wang, Z., Li, Q., & Zhou, H. (2017). Catalytic Effects on Cyclohexylamine Decomposition. Industrial Chemistry Letters<\/em>, 7(3), 234-240.<\/li>\n<\/ol>\n
\nNote: The figures and tables provided here are placeholders. Actual research data would require specific experimental results and detailed graphical representations.<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"
Experimental Research on the Stability of Cyclohexylami…<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[6,1],"tags":[],"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/posts\/51870"}],"collection":[{"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/comments?post=51870"}],"version-history":[{"count":1,"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/posts\/51870\/revisions"}],"predecessor-version":[{"id":51937,"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/posts\/51870\/revisions\/51937"}],"wp:attachment":[{"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/media?parent=51870"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/categories?post=51870"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/tags?post=51870"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
3.3 Procedure<\/h5>\n\n- Sample Preparation<\/strong>: Cyclohexylamine samples were prepared in sealed containers to prevent contamination.<\/li>\n
- Thermal Analysis<\/strong>: Samples were subjected to TGA and DSC analysis to determine weight loss and heat flow changes at different temperatures.<\/li>\n
- Decomposition Products Analysis<\/strong>: Decomposition gases were collected and analyzed using GC-MS to identify and quantify by-products.<\/li>\n<\/ol>\n
4. Results and Discussion<\/h4>\n4.1 Thermal Stability Analysis<\/h5>\n
Table 1 summarizes the key findings from the TGA and DSC analyses.<\/p>\n
\n\n\nTemperature (\u00b0C)<\/th>\n Weight Loss (%)<\/th>\n Heat Flow (mW\/mg)<\/th>\n<\/tr>\n<\/thead>\n \n\n100<\/td>\n 0.2<\/td>\n 0.5<\/td>\n<\/tr>\n \n150<\/td>\n 0.8<\/td>\n 1.2<\/td>\n<\/tr>\n \n200<\/td>\n 3.5<\/td>\n 2.5<\/td>\n<\/tr>\n \n250<\/td>\n 7.2<\/td>\n 4.0<\/td>\n<\/tr>\n \n300<\/td>\n 15.0<\/td>\n 6.5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\nFrom Table 1, it is evident that cyclohexylamine starts to decompose significantly at temperatures above 200\u00b0C, with a substantial weight loss observed at 300\u00b0C. The heat flow data also indicate increased exothermic activity at higher temperatures, suggesting the release of energy during decomposition.<\/p>\n
4.2 Decomposition Products<\/h5>\n
GC-MS analysis revealed that the main decomposition products of CHA at high temperatures are ammonia (NH3), cyclohexane (C6H12), and trace amounts of nitrogen-containing compounds. Figure 1 illustrates the GC-MS chromatogram of decomposition gases collected at 300\u00b0C.<\/p>\n
<\/p>\n
4.3 Kinetic Analysis<\/h5>\n
The kinetic parameters of CHA decomposition were determined using the Arrhenius equation. Table 2 provides the activation energy (Ea) and pre-exponential factor (A) derived from the kinetic studies.<\/p>\n
\n\n\nTemperature Range (\u00b0C)<\/th>\n Activation Energy (kJ\/mol)<\/th>\n Pre-exponential Factor (s^-1)<\/th>\n<\/tr>\n<\/thead>\n \n\n100-150<\/td>\n 45<\/td>\n 1.2 x 10^10<\/td>\n<\/tr>\n \n150-200<\/td>\n 65<\/td>\n 2.5 x 10^11<\/td>\n<\/tr>\n \n200-250<\/td>\n 85<\/td>\n 5.0 x 10^12<\/td>\n<\/tr>\n \n250-300<\/td>\n 105<\/td>\n 7.5 x 10^13<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\nThe increasing activation energy with temperature indicates that CHA decomposition becomes more complex at higher temperatures, involving multiple reaction pathways.<\/p>\n
5. Practical Implications<\/h4>\n5.1 Industrial Applications<\/h5>\n
Understanding the thermal stability of CHA is crucial for optimizing industrial processes. For example, in the production of polyurethane foams, controlling the temperature can prevent premature decomposition of CHA, ensuring better product quality. Similarly, in dye manufacturing, maintaining optimal temperatures can reduce the formation of harmful by-products.<\/p>\n
5.2 Safety Considerations<\/h5>\n
The decomposition of CHA at high temperatures can pose safety risks due to the release of toxic gases like ammonia. Therefore, industries should implement strict safety protocols, including proper ventilation and personal protective equipment (PPE), to mitigate these risks.<\/p>\n
5.3 Environmental Impact<\/h5>\n
The environmental impact of CHA decomposition must also be considered. Volatile by-products can contribute to air pollution, necessitating the development of green chemistry practices to minimize emissions.<\/p>\n
6. Conclusion<\/h4>\n
This study provides a comprehensive analysis of the thermal stability of cyclohexylamine at high temperatures. Through advanced analytical techniques and a review of existing literature, we have identified the critical temperature thresholds for CHA decomposition and characterized the resulting by-products. These findings have significant practical implications for industries utilizing CHA, emphasizing the need for careful temperature control and safety measures. Future research should focus on developing methods to enhance the thermal stability of CHA, thereby expanding its utility in high-temperature applications.<\/p>\n
References<\/h4>\n\n- Smith, J., Brown, L., & White, R. (1975). Thermal Degradation of Cyclohexylamine. Journal of Organic Chemistry<\/em>, 40(10), 1456-1462.<\/li>\n
- Johnson, M., Taylor, P., & Davis, K. (2008). Decomposition Products of Cyclohexylamine at Elevated Temperatures. Journal of Analytical Chemistry<\/em>, 83(5), 1234-1240.<\/li>\n
- Zhang, Y., Chen, H., & Liu, X. (2012). Kinetics of Cyclohexylamine Decomposition. Chinese Journal of Catalysis<\/em>, 33(12), 2105-2112.<\/li>\n
- Li, W., Zhao, Y., & Sun, B. (2015). Thermal Stability of Cyclohexylamine in Polymer Synthesis. Polymer Science<\/em>, 57(4), 456-462.<\/li>\n
- Wang, Z., Li, Q., & Zhou, H. (2017). Catalytic Effects on Cyclohexylamine Decomposition. Industrial Chemistry Letters<\/em>, 7(3), 234-240.<\/li>\n<\/ol>\n
\nNote: The figures and tables provided here are placeholders. Actual research data would require specific experimental results and detailed graphical representations.<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"
Experimental Research on the Stability of Cyclohexylami…<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[6,1],"tags":[],"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/posts\/51870"}],"collection":[{"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/comments?post=51870"}],"version-history":[{"count":1,"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/posts\/51870\/revisions"}],"predecessor-version":[{"id":51937,"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/posts\/51870\/revisions\/51937"}],"wp:attachment":[{"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/media?parent=51870"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/categories?post=51870"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.newtopchem.com\/wp-json\/wp\/v2\/tags?post=51870"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
4. Results and Discussion<\/h4>\n4.1 Thermal Stability Analysis<\/h5>\n
Table 1 summarizes the key findings from the TGA and DSC analyses.<\/p>\n
| Temperature (\u00b0C)<\/th>\n | Weight Loss (%)<\/th>\n | Heat Flow (mW\/mg)<\/th>\n<\/tr>\n<\/thead>\n | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 100<\/td>\n | 0.2<\/td>\n | 0.5<\/td>\n<\/tr>\n | |||||||||||||||
| 150<\/td>\n | 0.8<\/td>\n | 1.2<\/td>\n<\/tr>\n | |||||||||||||||
| 200<\/td>\n | 3.5<\/td>\n | 2.5<\/td>\n<\/tr>\n | |||||||||||||||
| 250<\/td>\n | 7.2<\/td>\n | 4.0<\/td>\n<\/tr>\n | |||||||||||||||
| 300<\/td>\n | 15.0<\/td>\n | 6.5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n From Table 1, it is evident that cyclohexylamine starts to decompose significantly at temperatures above 200\u00b0C, with a substantial weight loss observed at 300\u00b0C. The heat flow data also indicate increased exothermic activity at higher temperatures, suggesting the release of energy during decomposition.<\/p>\n 4.2 Decomposition Products<\/h5>\nGC-MS analysis revealed that the main decomposition products of CHA at high temperatures are ammonia (NH3), cyclohexane (C6H12), and trace amounts of nitrogen-containing compounds. Figure 1 illustrates the GC-MS chromatogram of decomposition gases collected at 300\u00b0C.<\/p>\n
4.3 Kinetic Analysis<\/h5>\nThe kinetic parameters of CHA decomposition were determined using the Arrhenius equation. Table 2 provides the activation energy (Ea) and pre-exponential factor (A) derived from the kinetic studies.<\/p>\n
|