Pt-xCe nanoparticles confined within HZSM-5 for increasing the selectivity of light olefins in iso-butane cracking

IF 2.5 4区材料科学 Q2 CHEMISTRY, APPLIED

Journal of Porous Materials Pub Date : 2024-11-19 DOI:10.1007/s10934-024-01683-9

Jiaqi Liu, Li Ma, Hongdan Zhang, Ying Zhao, Peng Cheng, Zhen Zhao

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Abstract

Pt-xCe@HZSM-5-op catalysts with different Ce contents were successfully synthesized via a hydrothermal method to increase the added value of iso-butane. The effects of the introduction of metal into zeolite on the relative crystallinity, pore characteristics, morphology, metal state and acidity were investigated by X-ray diffraction, N₂ adsorption‒desorption, scanning and transmission electron microscopy, X-ray photoelectron spectroscopy, temperature-programmed desorption of ammonia and pyridine infrared spectroscopy. The introduction of Pt and Ce species decreased the amounts of weak acid sites and increased the strong acid content of HZSM-5 catalyst. And it also adjusted the distribution of B acid and L acid. Moreover, the effect of varying Ce content was investigated on the catalytic cracking performance of Pt-xCe@HZSM-5-op catalysts. Among the catalysts, Pt-0.25Ce@HZSM-5-op catalyst exhibited the best catalytic performance for iso-butane cracking at 625 °C.

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限制在HZSM-5内的Pt-xCe纳米颗粒用于提高异丁烷裂化中轻烯烃的选择性

通过水热法成功合成了不同Ce含量的Pt-xCe@HZSM-5-op催化剂，以提高异丁烷的附加值。通过 X 射线衍射、N2 吸附-解吸、扫描和透射电子显微镜、X 射线光电子能谱、氨的温度编程解吸和吡啶红外光谱研究了沸石中引入金属对其相对结晶度、孔隙特征、形态、金属状态和酸度的影响。铂和铈的引入降低了 HZSM-5 催化剂中弱酸位点的含量，增加了强酸位点的含量。同时还调整了 B 酸和 L 酸的分布。此外，还研究了不同 Ce 含量对 Pt-xCe@HZSM-5-op 催化剂催化裂化性能的影响。在这些催化剂中，Pt-0.25Ce@HZSM-5-op 催化剂在 625 ℃ 下对异丁烷裂解的催化性能最好。

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来源期刊

Journal of Porous Materials 工程技术-材料科学：综合

CiteScore

4.80

自引率

7.70%

发文量

203

审稿时长

2.6 months

期刊介绍： The Journal of Porous Materials is an interdisciplinary and international periodical devoted to all types of porous materials. Its aim is the rapid publication of high quality, peer-reviewed papers focused on the synthesis, processing, characterization and property evaluation of all porous materials. The objective is to establish a unique journal that will serve as a principal means of communication for the growing interdisciplinary field of porous materials. Porous materials include microporous materials with 50 nm pores. Examples of microporous materials are natural and synthetic molecular sieves, cationic and anionic clays, pillared clays, tobermorites, pillared Zr and Ti phosphates, spherosilicates, carbons, porous polymers, xerogels, etc. Mesoporous materials include synthetic molecular sieves, xerogels, aerogels, glasses, glass ceramics, porous polymers, etc.; while macroporous materials include ceramics, glass ceramics, porous polymers, aerogels, cement, etc. The porous materials can be crystalline, semicrystalline or noncrystalline, or combinations thereof. They can also be either organic, inorganic, or their composites. The overall objective of the journal is the establishment of one main forum covering the basic and applied aspects of all porous materials.