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.
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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 CsxPW series were more strong than that of Csx.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.
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Keywords:
- solid salt of heteropolyacid,
- acidity,
- esterification
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