Synthesis of dimethyl carbonate by transesterification with various MgO–CeO2 mixed oxide catalysts |
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| Authors: | Haznan Abimanyu Chang Soo Kim Byoung Sung Ahn Kye Sang Yoo |
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| Affiliation: | (1) Applied Catalysis Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, P.O. Box 110, Dalian, 116023, P.R. China;(2) Laboratoire de Chimie des Matériaux Inorganiques, ISIS, The University of Namur (FUNDP), 61 rue de Bruxelles, Namur, B-5000, Belgium |
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| Abstract: | Abstact SAPO-34s with low and high Si content were synthesized and characterized by XRD, XRF, NMR, FTIR and TG-DSC. Different Si content
generated no apparent difference in XRD patterns and 31P and 27Al MAS NMR spectra. The Si coordination states studied by 29Si MAS NMR predicted the acidity difference caused by Si incorporation. The absorbance of bridge hydroxyls in FTIR spectra
also showed the amount of active sites differed with Si content. Both of the two samples were employed as catalysts in the
transformation of chloromethane to light olefins and proved to be very selective catalysts for light olefins production. The
influences of Si content on chloromethane conversion and product selectivity were investigated in details. Coke amount and
coke species were determined by TG-DSC and FTIR. Coke formation was related to the Si content of SAPO-34 and corresponded
to the catalytic performance. |
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| Keywords: | chloromethane light olefins SAPO-34 Si incorporation |
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