Abstract
Phosphorus modification is a prevalent technique for enhancing the hydrothermal stability and adjusting the acidity of zeolite catalysts. The relation between the structure of phosphorus-modified zeolite catalysts and their catalytic performance has been studied using ZSM-5 zeolites. However, phosphorus modification of ZSM-5 zeolites is usually performed after template removal via calcination, and the phosphorus modification of ZSM-5 zeolites without template removal has not been comprehensively studied. This study comparatively examines the phosphorus modification of ZSM-5 before and after template removal during aromatization of 1-octene. The structures of both catalyst samples (with and without template removal) were characterized via X-ray diffraction, nuclear magnetic resonance spectroscopy, infrared spectroscopy, and temperature-programmed desorption of ammonia and correlated with their catalytic performance. Results indicate that phosphorus modified ZSM-5 zeolites without template removal exhibit superior catalytic activity to those with template preremoval in the aromatization of 1-octene and hydrothermal treatment. The stabilizing effect of the template on phosphorus-modified ZSM-5 zeolites during the aromatization reaction and hydrothermal treatment is discussed based on comprehensive characterization of both the P-modified ZSM-5 catalysts. This study elucidates the influence of the template on P-modified zeolite catalysts and offers a new reference for the post-treatment of zeolites.
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Acknowledgements
The authors are grateful for financial support from the National Key R&D Program of China (No. 2020YFB0606404), the Ministry of Science and Technology of China (Grant No. 2022YFA1604104), the Ordos Science and Technology Cooperation Key Special Project 2021EEDSCXQDFZ008 and funding support from Synfuels China, Co. Ltd. Wentao Zheng appreciates the support from NPL, CAEP (No. 2019BB08).
We greatly acknowledge Ms. Guoyan Zhao, Ms. Caixia Hu, and Ms. Yiling Bai at Synfuels China Co., Ltd. for assistance in performing IR, NMR, and XRD analysis, respectively.
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Cao, J., Hou, R., Wang, F. et al. Stabilizing Effect of a Template on Phosphorus-Modified ZSM-5 Zeolites. Catal Lett (2024). https://doi.org/10.1007/s10562-024-04704-z
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DOI: https://doi.org/10.1007/s10562-024-04704-z