The Origin of Metal Loading Heterogeneities in Pt/Zeolite Y Bifunctional Catalysts

被引：15
|
作者：
van der Wal, Lars I. [1 ]
de Jong, Krijn P. [1 ]
Zecevic, Jovana [1 ]
机构：
[1] Univ Utrecht, Debye Inst Nanomat Sci, Inorgan Chem & Catalysis, Univ Weg 99, NL-3584 CG Utrecht, Netherlands
来源：
CHEMCATCHEM | 2019年 / 11卷 / 16期
基金：
欧洲研究理事会;
关键词：
Bifunctional Catalysts; Electron Microscopy; Energy Dispersive X-ray Spectroscopy; Pt; Zeolite Y; ZEOLITE-Y; PHYSICOCHEMICAL PROPERTIES; HYDROGEN CHEMISORPTION; PARTICLE-SIZE; HYDROCRACKING; ALUMINUM; ACID; HYDROISOMERIZATION; PERFORMANCE; MESOPORE;
D O I：
10.1002/cctc.201900441
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Preparing catalysts with highly dispersed metal nanoparticles and narrow particle size distribution has been in the focus of numerous studies. Besides size and size distribution, the location of metal nanoparticles within and local metal loading of the support can have significant impact on catalytic performance. This study revealed that great variations in Pt loading between individual Pt/zeolite Y crystals occurred irrespective of the metal deposition method, namely ion-exchange (IE) or incipient wetness impregnation (IWI). The variation in Pt loading was found to be directly related to different Si/Al ratios of individual zeolite crystals. Results indicate that this Si/Al variation was likely induced by post-synthesis treatments, commonly performed to introduce mesoporosity. In view of the great importance of zeolite-based catalysts for oil refining, understanding the origin of such metal loading heterogeneities may lead to further improvement of zeolite-based catalytic performance.
引用
收藏
页码：4081 / 4088
页数：8
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