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Issue 16, 2018
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Effect of the acidity of HZSM-5/MCM-41 hierarchical zeolite on its catalytic performance in supercritical catalytic cracking of n-dodecane: experiments and mechanism

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Abstract

The effect of the acidity of HZSM-5/MCM-41 hierarchical zeolite on its catalytic performance in the supercritical catalytic cracking of n-dodecane was investigated by controlled ion exchange with NaCl solution under ultrasonic conditions. XRD and nitrogen adsorption–desorption results showed that the crystal and porous properties were not affected, while NH3-TPD, the probe reaction of n-hexane cracking and temperature-programmed surface reaction (TPSR) of n-dodecane demonstrated that strong Brønsted acid sites were replaced by Na+ (weak Lewis acid sites) to different extents with varying concentrations of NaCl solution. Although the initial conversion of n-dodecane during the supercritical catalytic cracking was slightly reduced, its stability was greatly enhanced by ion exchange. An ultrastable catalyst with no obvious deactivation within 3 h of time on stream (TOS) was obtained by ion exchange with 0.8 M NaCl solution. A mechanism describing the role of the acid sites residing in both micropores and mesopores of the hierarchical catalyst was proposed based on coke analysis.

Graphical abstract: Effect of the acidity of HZSM-5/MCM-41 hierarchical zeolite on its catalytic performance in supercritical catalytic cracking of n-dodecane: experiments and mechanism

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Publication details

The article was received on 05 May 2018, accepted on 20 Jul 2018 and first published on 20 Jul 2018


Article type: Paper
DOI: 10.1039/C8CY00908B
Catal. Sci. Technol., 2018,8, 4241-4256

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    Effect of the acidity of HZSM-5/MCM-41 hierarchical zeolite on its catalytic performance in supercritical catalytic cracking of n-dodecane: experiments and mechanism

    X. Xian, C. Ran, P. Yang, Y. Chu, S. Zhao and L. Dong, Catal. Sci. Technol., 2018, 8, 4241
    DOI: 10.1039/C8CY00908B

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