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Open AccessArticle

Methyl Chloride Synthesis over Metal Chlorides-Modified Mesoporous Alumina Catalyst

1,2, 1,2, 1,2, 1,2,* and 1,3
1
School of Chemistry and Chemical Engineering of Shihezi University, Shihezi 832003, China
2
Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, Shihezi 832003, China
3
School of Chemical Engineering & Technology, Tianjin University, Tianjin 300072, China
*
Author to whom correspondence should be addressed.
Catalysts 2018, 8(3), 99; https://doi.org/10.3390/catal8030099
Received: 30 January 2018 / Revised: 15 February 2018 / Accepted: 24 February 2018 / Published: 28 February 2018
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PDF [2662 KB, uploaded 28 February 2018]
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Abstract

Mesoporous alumina has been successfully prepared using sucrose as templates. Mesoporous alumina-based catalysts, neat and impregnated with metal chlorides, were tested for gas phase methyl chloride synthesis from methanol and HCl. The catalysts were characterized with Transmission electron microscope (TEM), N2-physisorption, X-ray diffraction (XRD), Fourier Transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) to identify the relationship between the catalyst characteristics and their activity and selectivity. Experimental studies revealed that the alumina acidity decreases with increasing calcination temperature, and the catalytic activity is strongly related to the acidity. The catalytic activity of mesoporous alumina (named as Al2O3-500 °C) is higher than that of the commercial alumina under the same experimental conditions. The metal chlorides-modified alumina has more Lewis acid sites than the neat alumina. Impregnation by alcohol is more effective for increasing the amount of Lewis acid sites than impregnation by water. The total Lewis acid concentration of the modified alumina decreases in the following order: ZnCl2/Al2O3-E > ZnCl2/Al2O3-W > FeCl3/Al2O3-E > FeCl3/Al2O3-W, Where E and W respectively indicate that the catalyst impregnation solution is ethanol and water, which agrees well with the catalytic performance order. The effect of ethanol as a solvent in the impregnation could be due to the inhibition of the hydrolysis of metal chloride. The catalyst delivered a stable performance during a 100 h test that was significantly higher than that of commercial alumina. View Full-Text
Keywords: methyl chloride; alumina; acidity; hydrochlorination; metal chlorides methyl chloride; alumina; acidity; hydrochlorination; metal chlorides
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Ji, Y.; Zhang, F.; Yu, F.; Zhang, J.; Zhang, J. Methyl Chloride Synthesis over Metal Chlorides-Modified Mesoporous Alumina Catalyst. Catalysts 2018, 8, 99.

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