Zeolite-encaged Ultrasmall Pt-Zn Species with Trace Amount of Pt for Efficient Propane Dehydrogenation

doi:10.1007/s40242-023-3063-8

Chemical Research in Chinese Universities ›› 2023, Vol. 39 ›› Issue (6): 870-876.doi: 10.1007/s40242-023-3063-8

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Zeolite-encaged Ultrasmall Pt-Zn Species with Trace Amount of Pt for Efficient Propane Dehydrogenation

QU Ziqiang¹, ZHANG Tianjun², YIN Xichen¹, ZHANG Junyi³, XIONG Xiaoyun⁴, and SUN Qiming¹

1. Innovation Center for Chemical Science, College of Chemistry, Chemical Engineering and Materials Science, Jiangsu Key Laboratory of Advanced Negative Carbon Technologies, Soochow University, Suzhou 215123, P.R. China;
2. College of Chemistry and Materials Science, Hebei University, Baoding 071002, P.R. China;
3. PetroChina Lanzhou Petrochemical Company, Lanzhou 730000, P.R. China;
4. Lanzhou Petrochemical Research Center, Petrochemical Research Institute, PetroChina, Lanzhou 730000, P.R. China

Received:2023-03-06 Online:2023-12-01 Published:2023-11-18
Contact: SUN Qiming E-mail:sunqiming@suda.edu.cn
Supported by:
This work was supported by the National Key R&D Program of China (No.2022YFA1506000), the Technology Development Project from SINOPEC (No.LZSH-2022-JS-81), the Natural Science Foundation of Jiangsu Province, China (No.BK20210698), the Jiangsu Distinguished Professor Program, China and the Gusu Innovation and Entrepreneurship Leading Talents Program, China (No.ZXL2022497).

Abstract

Abstract: Propane dehydrogenation (PDH) has become a globe- welcoming technology to meet the massive demand for propylene, but the most commonly used Pt-based catalysts suffer from quick sintering, poor selectivity for propylene, and unsatisfied Pt utilization. Herein, a series of Silicalite-1 (S-1) zeolite- encaged ultrasmall Pt-Zn clusters with a trace amount of Pt [40— 180 ppm (parts per million)] were developed by using a one-pot ligand-protected direct H₂ reduction method. Interestingly, the extremely low amount of Pt can significantly promote the activity of zeolite-encaged Zn catalysts in PDH reactions. Thanks to the high Pt dispersion, the synergy between Pt and Zn species, and the confinement effect of zeolites, the optimized PtZn@S-1 catalyst with 180 ppm Pt and 1.88% (mass fraction) Zn, exhibited an extraordinarily high propane conversion (33.9%) and propylene selectivity (99.5%) at 550 ℃ with a weight hourly space velocity (WHSV) of 8 h^-1, affording an extremely high propylene formation rate of 340.7 mol_C₃H₆·g_Pt^-1·h^-1. This work provides a reference for the preparation of zeolite-encaged metal catalysts with high activity and noble metal utilization in PDH reactions.

Key words: Propane dehydrogenation, Zeolite, Confinement effect, Bimetallic catalyst, Pt-Zn

QU Ziqiang, ZHANG Tianjun, YIN Xichen, ZHANG Junyi, XIONG Xiaoyun, and SUN Qiming. Zeolite-encaged Ultrasmall Pt-Zn Species with Trace Amount of Pt for Efficient Propane Dehydrogenation[J]. Chemical Research in Chinese Universities, 2023, 39(6): 870-876.

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Zeolite-encaged Ultrasmall Pt-Zn Species with Trace Amount of Pt for Efficient Propane Dehydrogenation

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