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

Xian Xiaochao; Ran Chao; Yang PengChu YirongZhao ShuoDong Lichun

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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

机译：HZSM-5 / MCM-41的酸度的影响分层沸石的催化性能在超临界催化裂化n-dodecane:实验和机制

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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 BrOnsted 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.

机译：HZSM-5 / MCM-41的酸度的影响分层沸石的催化性能的超临界催化裂化n-dodecane调查控制离子交换与氯化钠溶液超声条件。adsorption-desorption结果表明水晶和多孔特性没有影响,虽然NH3-TPD,正己烷的探针反应开裂和程序升温表面反应(TPSR n-dodecane证明)强大的布仑斯惕酸取而代之的是Na +网站(弱路易斯酸网站)不同区段不同浓度的氯化钠溶液。期间n-dodecane的初始转换超临界催化裂化略降低,大大提高了其稳定性离子交换。时间在流的明显失活在3 h(TOS)是通过离子交换为0.8 M氯化钠溶液。酸驻留在微孔隙和网站中孔分层的催化剂提出了基于可口可乐的分析。

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来源
《Catalysis science & technology》 |2018年第16期|4241-4256|共16页
作者
Xian Xiaochao; Ran Chao; Yang PengChu YirongZhao ShuoDong Lichun;
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作者单位

Chongqing Univ, Sch Chem & Chem Engn, Chongqing 400030, Peoples R China;

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正文语种英语
中图分类汉语教学;
关键词
Catalytic cracking; Ions; AcidityHierarchicalZeolitesdodecane;

机译：催化开裂;离子;AcidityHierarchicalZeolitesdodecane;

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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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