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论文类型：期刊论文

发表时间：2011-08-31

发表刊物：APPLIED CATALYSIS B-ENVIRONMENTAL

收录刊物：SCIE、EI

卷号：107

期号：1-2

页面范围：68-76

ISSN号：0926-3373

关键字：Bioethanol; Transformation; Light olefins; Ce-modified; Nanocrystalline HZSM-5

摘要：Conversion of bioethanol into bulk chemicals besides ethylene is a promising process in which the stability of catalyst and the selectivity of products are important. In this study, a series of Ce-modified nanocrystalline HZSM-5 catalysts were prepared and their catalytic performance in the conversion of bioethanol into C-2-C-4 light olefins was investigated in a fixed-bed reactor at 400 degrees C under atmospheric pressure. The results show that the stability of catalyst and the distribution of products depend strongly on the content of cerium and the calcination temperature: both cerium content and calcination temperature affect not only the acid properties of the tested catalyst samples but also the composition of cerium species (Ce3+/Ce4+) as revealed by XPS. Among the tested catalyst samples, the catalyst with 5 wt% cerium loading and 520 degrees C calcination temperature exhibits the best stability and selectivity to C-3-C-4 light olefins. (C) 2011 Elsevier B.V. All rights reserved.