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C2–C4 light olefins from bioethanol catalyzed by Ce-modified nanocrystalline HZSM-5 zeolite catalysts

2011; Elsevier BV; Volume: 107; Issue: 1-2 Linguagem: Inglês

10.1016/j.apcatb.2011.06.038

1873-3883

Jiandong Bi, Min Liu, Chunshan Song, Xiangsheng Wang, Xinwen Guo,

Zeolite Catalysis and Synthesis

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 C2–C4 light olefins was investigated in a fixed-bed reactor at 400 °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 °C calcination temperature exhibits the best stability and selectivity to C3–C4 light olefins.