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Start Over Author "Fujita, Shin-ichiro" Journal catalysis letters
15 results on '"Fujita, Shin-ichiro"'

13. Synthesis of Diphenyl Carbonate from Phenol and Carbon Dioxide in the Presence of Carbon Tetrachloride and Zinc Chloride.

Author

Guozhi Fan, Fujita, Shin-ichiro, Bing Zou, Nishiura, Masahiro, Xiangchun Meng, and Arai, Masahiko

Subjects
*PHENOL, *CARBON dioxide, *CARBON tetrachloride, *ZINC chloride, *TEMPERATURE
Abstract

Diphenyl carbonate (DPC) was synthesized from phenol and dense phase CO2 in the presence of CCl4 and K2CO3 using different catalysts of ZnCl2, ZnBr2, Lewis acid ionic liquids including 1-butyl-3-methylimidazolium chloride (BMIMCl) and bromide (BMIMBr). It was found that K2CO3 was not required, ZnCl2 and ZnBr2 were similar in the catalytic performance, and the use of BMIMCl and BMIMBr was not effective for the production of DPC. For the reactions with ZnCl2 in CCl4, the effects of such reaction variables as temperature, CO2 pressure, the amount of ZnCl2, and the volume of CCl4 were studied in detail. It was shown that the pressure was less influential while a larger amount of ZnCl2, a smaller volume of CCl4, and a low temperature of around 100°C were beneficial for the synthesis of DPC. On the basis of the results obtained, possible reaction mechanisms were discussed. [ABSTRACT FROM AUTHOR]

Published
2009
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14. Temperature programmed oxidation of Cu/ZnO catalysts with N2O: an attempt for characterization of copper catalysts

Author

Fujita, Shin-ichiro, Matsumoto, Susumu, and Takezawa, Nobutsune

Abstract

For characterization of the surface structure of metallic copper formed on the support, temperature programmed oxidation (TPO) with N2O was carried out over various Cu/ZnO catalysts. Four peaks of the N2 formation (a, ß, ? and d) were observed at 223, 400, 545 and 600 K in the TPO runs. The average copper crystallite size estimated from the sum of the amount of a- and ß-peaks agreed fairly with those determined by X-ray diffraction and transmission electron microscopy. It was concluded that a- and ß-peaks resulted from the oxidation of metallic copper atoms on the steps, corners and/ or defect sites, and on the flat sites of the surface of copper crystallites, respectively, while ?- and d-peaks resulted from the bulk oxidation of copper.

Published
1994
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