Effects of Cesium Ions and Cesium Oxide in Side-Chain Alkylation of Toluene with Methanol over Cesium-Modified Zeolite X
发表时间：2019-03-13
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- 论文类型：
- 期刊论文
- 第一作者：
- Han, He
- 合写作者：
- Liu, Min,Ding, Fanshu,Wang, Yiren,Guo, Xinwen,Song, Chunshan
- 发表时间：
- 2016-02-24
- 发表刊物：
- INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
- 收录刊物：
- SCIE、EI、Scopus
- 文献类型：
- J
- 卷号：
- 55
- 期号：
- 7
- 页面范围：
- 1849-1858
- ISSN号：
- 0888-5885
- 摘要：
- The side-chain alkylation of toluene with methanol was studied on cesium-modified zeolite X prepared by ion exchange and impregnation with different cesium precursors. The catalyst was characterized by X-ray diffraction, scanning electron microscopy, X-ray fluorescence spectroscopy, Ar physical adsorption desorption, NH3 temperature-programmed desorption (TPD), CO2-TPD, thermogravimetric/differential thermal analysis, ultraviolet-Raman spectroscopy, energy-dispersive spectrometry, and X-ray photoelectron spectroscopy. Cesium hydroxide was found to be the most effective precursor for modifying zeolite X. Cesium ions bonded on the framework and cesium oxide formed in the pore were found to take different roles in this reaction. Cesium ions could adsorb and activate toluene or modify the basicity of framework oxygen, whereas cesium oxide could ensure the effective conversion of methanol to formaldehyde and inhibit the process of coke deposition. A possible reaction pathway for this reaction over cesium-modified samples was described. The synergistic effect of cesium ions and cesium oxide was proven to be important for the formation of styrene and ethylbenzene.
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