| Thermochemical Properties and Decomposition Kinetics of Ammonium Magnesium Phosphate Monohydrate |
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| 作者姓名： | 吴健 袁爱群 黄在银 童张法 陈杰 梁榕兰 |
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| 作者单位： | [1]College of Chemistry and Ecology Engineering, Guangxi University for Nationalities, Nanning, Guangxi 530006, China [2]School of Chemistry and Chemical Engineering, Guangxi University, Nanning, Guangxi 530004, China |
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| 基金项目： | Project supported by the National Natural Science Foundation of China （No. 20566003）. |
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| 摘 要： | Ammonium magnesium phosphate monohydrate NH4MgPO4·H2O was prepared via solid state reaction at room temperature and characterized by XRD, FT-IR and SEM. Thermochemical study was performed by an isoperibol solution calorimeter, non-isothermal measurement was used in a multivariate non-linear regression analysis to determine the kinetic reaction parameters. The results show that the molar enthalpy of reaction above is （28.795 ± 0.182） kJ/mol （298.15 K）, and the standard molar enthalpy of formation of the title complex is （-2185.43 ± 13.80） kJ/mol （298.15 K）. Kinetics analysis shows that the second decomposition of NH4MgPO4·H2O acts as a double-step reaction： an nth-order reaction （Fn） with n=4.28, E1=147.35 kJ/mol, A1=3.63×10^13 s^-1 is followed by a second-order reaction （F2） with E2=212.71 kJ/mol, A2= 1.82 × 10^18 s^-1.
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| 关 键 词： | 磷酸铵镁一水合物 固态反应 热化学性质 标准焓 热解动力学 鸟粪石 |
| 修稿时间： | 2006-05-092006-09-26 |
Thermochemical Properties and Decomposition Kinetics of Ammonium Magnesium Phosphate Monohydrate |
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| WU, Jian, YUAN, Ai-Qun, HUANG, Zai-Yin, TONG, Zhang-Fa,CHEN, Jie, LIANG, Rong-Lan.Thermochemical Properties and Decomposition Kinetics of Ammonium Magnesium Phosphate Monohydrate[J].Chinese Journal of Chemistry,2007,25(1):72-76. |
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| Authors: | WU Jian YUAN Ai-Qun HUANG Zai-Yin TONG Zhang-Fa CHEN Jie LIANG Rong-Lan |
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| Institution: | 1,College of Chemistry and Ecology Engineering, Guangxi University for Nationalities, Nanning, Guangxi 530006, China ;2, School of Chemistry and Chemical Engineering, Guangxi University, Nanning, Guangxi 530004, China |
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| Abstract: | Ammonium magnesium phosphate monohydrate NH4MgPO4·H2O was prepared via solid state reaction at room temperature and characterized by XRD, FT‐IR and SEM. Thermochemical study was performed by an isoperibol solution calorimeter, non‐isothermal measurement was used in a multivariate non‐linear regression analysis to determine the kinetic reaction parameters. The results show that the molar enthalpy of reaction above is (28.795±0.182) kJ/mol (298.15 K), and the standard molar enthalpy of formation of the title complex is (?2185.43±13.80) kJ/mol (298.15 K). Kinetics analysis shows that the second decomposition of NH4MgPO4·H2O acts as a double‐step reaction:an nth‐order reaction (Fn) with n=4.28, E1=147.35 kJ/mol, A1=3.63×1013 s?1 is followed by a second‐order reaction (F2) with E2=212.71 kJ/mol, A2=1.82×1018 s?1. |
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| Keywords: | ammonium magnesium phosphate solid state reaction standard enthalpy of formation thermal decomposition kinetics |
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