Maximizing sinusoidal channels of HZSM-5 for high shape-selectivity to p-xylene

Chuanfu Wang (), Lei Zhang, Xin Huang, Yufei Zhu, Gang (Kevin) Li, Qinfen Gu, Jingyun Chen, Linge Ma, Xiujie Li, Qihua He, Junbo Xu, Qi Sun, Chuqiao Song, Mi Peng, Junliang Sun () and Ding Ma ()
Additional contact information
Chuanfu Wang: National Institute of Clean-and-Low-Carbon Energy (NICE)
Lei Zhang: Peking University
Xin Huang: National Institute of Clean-and-Low-Carbon Energy (NICE)
Yufei Zhu: National Institute of Clean-and-Low-Carbon Energy (NICE)
Gang (Kevin) Li: The University of Melbourne
Qinfen Gu: Australian Synchrotron
Jingyun Chen: National Institute of Clean-and-Low-Carbon Energy (NICE)
Linge Ma: National Institute of Clean-and-Low-Carbon Energy (NICE)
Xiujie Li: Chinese Academy of Sciences
Qihua He: Peking University Health Science Centre
Junbo Xu: Chinese Academy of Sciences
Qi Sun: National Institute of Clean-and-Low-Carbon Energy (NICE)
Chuqiao Song: Peking University
Mi Peng: Peking University
Junliang Sun: Peking University
Ding Ma: Peking University

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: Abstract The shape-selective catalysis enabled by zeolite micropore’s molecular-sized sieving is an efficient way to reduce the cost of chemical separation in the chemical industry. Although well studied since its discovery, HZSM-5′s shape-selective capability has never been fully exploited due to the co-existence of its different-sized straight channels and sinusoidal channels, which makes the shape-selective p-xylene production from toluene alkylation with the least m-xylene and o-xylene continue to be one of the few industrial challenges in the chemical industry. Rather than modifications which promote zeolite shape-selectivity at the cost of stability and reactivity loss, here inverse Al zoned HZSM-5 with sinusoidal channels predominantly opened to their external surfaces is constructed to maximize the shape-selectivity of HZSM-5 sinusoidal channels and reach > 99 % p-xylene selectivity, while keeping a very high activity and good stability ( > 220 h) in toluene methylation reactions. The strategy shows good prospects for shape-selective control of molecules with tiny differences in size.

Date: 2019
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DOI: 10.1038/s41467-019-12285-4

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