期刊
JOURNAL OF ENERGY CHEMISTRY
卷 23, 期 6, 页码 771-780出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S2095-4956(14)60211-4
关键词
methanol-to-hydrocarbons; product distribution; HZSM-5; external surface; acidic sites
资金
- Shanghai Key Basic Research [11JC1412500]
- National Natural Science Foundation of China [51174277]
The external surface of HZSM-5 zeolite was passivated by liquid siliceous deposition and by acidic sites poisoning with lepidine, respectively. Then methanol-to-hydrocarbons (MTH) reaction was investigated over the above as-prepared catalysts and the dissoluble coke on these used catalysts was analyzed by GC-MS, to study the role of the external surface of HZSM-5 in the catalytic reaction. Comparison with the experimental results based on parent ZSM-5 showed that the product distribution of MTH reaction was obviously influenced by the external surface. Evidences were listed as follows: (1) the final product on parent HZSM-5 showed higher aromatic selectivity, lower olefin selectivity, lower ratio of C-2/C3+ aliphatics and higher ratio of C-3/C4+ aliphatics than the reaction mixture produced by the sole catalysis of acidic sites in HZSM-5 channel; (2) a little of pentamethylbenzene and hexamethylbenzene in the product on parent HZSM-5, was produced via multi-methylation of methylbenzene on the external surface. The above conclusion may also be suitable for MTH reaction over other zeolites with 10-ring channel.
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