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Citation: Zheng Shou-Rong, Qi Hai-Hua, Yan Qi-Jie, Fu Xian-Cai. A Study of the Interaction Between 12-Molybdophosphoric Acid and γ-Alumina[J]. Acta Physico-Chimica Sinica, ;1994, 10(06): 521-525. doi: 10.3866/PKU.WHXB19940608 shu

A Study of the Interaction Between 12-Molybdophosphoric Acid and γ-Alumina

1.
Department of Chemistry, Nanjing University, Nanjing 210008

Received Date: 19 February 1993
Available Online: 15 June 1994

12-moybdophosphoric acid (PMo_(12)) supported on γ-alumina has been studied by XRD, LRS EPR and titration methods.
The results reveal that as PMo_(12) loading is lower or equal to the monolayer coverage, there is a strong interaction between PMo_(12) and γ-alumina, PMo_(12) is adsorbed by γ-alumina irreversibly and a tetrahedral coordinatha Mo-O-Al species is observed.
Beyond monolayer coverage, the PMo_(12) is dispersed on γ-alumina as primary structure, and a secondary structure PMo_(12) is observed at more higher loading. The EPR results show that the stability of the supported PMo_(12) is lower than that of the unsupported PMo_(12) and the stability of PMo_(12) in the above three diffrent states is not the same. A model of PMo_(12) dispersed on γ-alumina is suggested.
- 12-molybdophosphoric acid,
- γ-alumina,
- Dispersion,
- Interaction
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