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Citation: Xie Wenhua, Ye Xingkai, Yang Xiangguang, Wu Yue. Catalytic Behaviours of Salts of Heteropolyacids Ⅰ. Synthesis, Characterization and Catalytic Activity of Cs-Salts of PW₁₂and SiW₁₂-Heteropolyacids[J]. Chinese Journal of Applied Chemistry, ;1996, 13(2): 37-40. shu

Catalytic Behaviours of Salts of Heteropolyacids Ⅰ. Synthesis, Characterization and Catalytic Activity of Cs-Salts of PW₁₂and SiW₁₂-Heteropolyacids

1.
Changchun Institute of Applied Chemistry, Chinese Academy of Sicences, Changchun 130022

Received Date: 10 July 1995
Available Online: 19 October 1995

A series of Cs⁺ salts of heteropolyacids(HPW₁₂, HSiW₁₂) were synthesized. The Hammett function H₀ was determined in order to investigate the acid strength. Their acid contents were measured by acid-base titration and NH₃-TPD respectively; both Bronsted and Lewis acidic sites were observed by monitoring the IR spectra of adsorbed pyridine. The specific surface areas were determined by BET-method. The acid catalytic activity of various salts was also investigated using the esterification of HAc and n-butyl alcohol as a test reaction. The results showed that the Hammett functions H₀ of Cs_xPW series were more strong than that of Cs_x.SiW series, while the acidic strength and acid contents decreased with the amount of alkali metal. What is more interesting is that the samples in which their Cs contents are x=2.5 have a maximum surface area. It was confirmed that, not the acid contents on the surface but in the bulk are responsible for the catalytic activity. The reaction seems to be a pseudoliquid phase process.
- solid salt of heteropolyacid,
- acidity,
- esterification
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Catalytic Behaviours of Salts of Heteropolyacids Ⅰ. Synthesis, Characterization and Catalytic Activity of Cs-Salts of PW12and SiW12-Heteropolyacids

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Catalytic Behaviours of Salts of Heteropolyacids Ⅰ. Synthesis, Characterization and Catalytic Activity of Cs-Salts of PW₁₂and SiW₁₂-Heteropolyacids