Thermochemical Properties and Decomposition Kinetics of Ammonium Magnesium Phosphate Monohydrate

Thermochemical Properties and Decomposition Kinetics of Ammonium Magnesium Phosphate

Monohydrate

WU,Jian; YUAN,Ai-Qun; HUANG,Zai-Yin; TONG,Zhang-Fa; CHEN,Jie; LIANG,Rong-Lan

【期刊名称】《《中国化学（英文版）》》 【年(卷),期】2007(025)001 【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=3.63×1013 s-1 is followed by a second-order reaction (F2) with E2=212.71 kJ/mol, A2= 1.82×1018 s-1. 【总页数】5页(72-76)

【关键词】ammonium magnesium phosphate; solid state reaction; standard enthalpy of formation; thermal decomposition kinetics

【作者】WU,Jian; YUAN,Ai-Qun; HUANG,Zai-Yin; TONG,Zhang-Fa; CHEN,Jie; LIANG,Rong-Lan

【作者单位】College of Chemistry and Ecology Engineering Guangxi University for Nationalities Nanning Guangxi 530006 China; School of Chemistry and Chemical Engineering Guangxi University Nanning Guangxi 530004 China 【正文语种】中文 【中图分类】O6 【文献来源】

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