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Citation: YUAN Ai-Qun, WU Jian, CHEN Jie, LIANG Rong-Lan, HUANG Zai-Yin, TONG Zhang-Fa. Thermochemical Properties and Decomposition Kinetics of Nanoparticle NH₄ZnPO₄ with Dodecahedron Morphology[J]. Chinese Journal of Applied Chemistry, ;2007, 24(1): 12-16. shu

Thermochemical Properties and Decomposition Kinetics of Nanoparticle NH₄ZnPO₄ with Dodecahedron Morphology

1.
a School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004;
2.
b Department of Chemistry and Ecology Engineering, Guangxi University for Nationalities, Nanning 530006

Corresponding author: YUAN Ai-Qun,
Received Date: 16 January 2006
Available Online: 20 April 2006
Fund Project: 国家自然科学基金(20566003) (20566003)广西科技厅青年基金(0339012)资助项目 (0339012)

Nanoparticle ammonium zinc phosphate with dodecahedron morphology was synthesized via the solid-state reaction at room temperature.The standard enthalpy for the reaction and the standard enthalpy of the formation of ammonium zinc phosphate were measured with a microcalorimeter at 298.15 K.Four kinds of thermal analysis methods were used to investigate its decomposition kinetic equations.The experimental results show that the obtained product is nanoparticle NH₄ZnPO₄ with size distribution between 100 nm and 300 nm, which belongs to hexagonal crystal system, the standard enthalpy of the reaction is 23.880 kJ/mol, and the standard enthalpy of the formation of ammonium zinc phosphate is-1 568.784 kJ/mol.There are two decomposition stages between 300 K and 950 K during the thermal decomposition.The de-ammonia reaction between 603 K and 692 K is controlled by three-dimensional diffusion with an activated energy of 210.434 kJ/mol and a pre-exponential factor of 5.45×10¹³ s^-1.The dehydrate process between 692 K and 773 K is controlled by nucleating and growing with an activated energy of 287.557 kJ/mol, and a pre-exponential factor of 9.62×10¹⁹ s^-1.The kinetic compensative effect is shown between ln A and E.
- ammonium zinc phosphate,
- solid-state reaction,
- microcalorimeter,
- decomposition kinetics,
- nanoparticle
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Thermochemical Properties and Decomposition Kinetics of Nanoparticle NH₄ZnPO₄ with Dodecahedron Morphology