Dispertion of ZnO to Ag in Ag/SiO2 Catalyst and Its Effect on the Stability of Indole Synthesis

Abstract

Abstract: Indole, which is an important raw organic material and fine chemical product, has many uses in the fields of industry, agriculture and medicine. There are many known methods to produce indole. One of the most promising routes, from an economic point of view, seems to be the direct catalytic synthesis from aniline and ethylene glycol. For the reaction, Ag/SiO₂ catalyst exhibits very high activity. However the activity of Ag/SiO₂ catalyst declined with increase of time on stream in the reaction. In order to improve the stability of the catalyst ZnO promoter was doped into Ag/SiO₂ catalyst. Cu/SiO₂-ZnO catalysts were prepared by separative impregnation method. It was found that ZnO could enhance the stability of the catalyst greatly. It was firstly obtained from the characterization of XRD and TEM that ZnO could efficiently improve the dispersion of silver on the support and inhibit the sintering of silver crystallite during the reaction process. ZnO is a structure promoter.

Key words: ZnO, Structure promoter, Ag/SiO₂ catalyst, Synthesis of indole, Stability

CLC Number:

O643

TrendMD:

SHI Lei, SUN Ren-An, CAI Tian-Xi, WANG Xin-Ping . Dispertion of ZnO to Ag in Ag/SiO₂ Catalyst and Its Effect on the Stability of Indole Synthesis[J]. Chem. J. Chinese Universities, 2004, 25(1): 108.

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Dispertion of ZnO to Ag in Ag/SiO₂ Catalyst and Its Effect on the Stability of Indole Synthesis

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