One-Pot Synthesis of Mesoporous Fe-SBA-15 and Its Catalytic Performance for Friedel-Crafts Benzylation

Abstract

Abstract: Mesoporous Fe-SBA-15 samples with different Si/Fe ratios were prepared by one-pot synthesis using urea as a self-adjustor for pH values. The XRD patterns and nitrogen adsorption-desorption isotherms showed that the samples had similar mesoporous structure to SBA-15. The UV-Vis spectra showed that the iron atoms in the samples calcined at 550 ℃ were mainly tetrahedrally coordinated. The activity test results showed that the samples exhibited excellent catalytic performance in Friedel-Crafts benzylation of aromatics with benzyl chloride. For example, the Fe-SBA-15 samples took20-70min for the complete conversion of benzyl chloride with 97.8%-100% selectivity for diphenylmethane under the conditions of 70 ℃ and benzene/benzyl chloride molar ratio of 14.4. The conversion of benzyl chloride increased with increasing reaction temperature and iron content, whereas the time required for complete conversion of benzyl chloride increased with the decrease of the molar ratio of benzene to benzyl chloride.

Key words: one-pot synthesis, urea, iron, SBA-15, mesoporous molecular sieve, Friedel-Crafts reaction, benzyl chloride

LIU Sen;DU Yunchen;XIAO Ni;ZHANG Yonglai;JI Yanyan;XIAO Fengshou*. One-Pot Synthesis of Mesoporous Fe-SBA-15 and Its Catalytic Performance for Friedel-Crafts Benzylation[J]. Chinese Journal of Catalysis, 2008, 29(5): 468-472.

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One-Pot Synthesis of Mesoporous Fe-SBA-15 and Its Catalytic Performance for Friedel-Crafts Benzylation

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