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Current:Home >Company news >Company news >铂极浆料 金树脂浆料 钯浆催化碳烟氧化用PtCexZr1-xO2催化剂的制备及性能研究

铂极浆料 金树脂浆料 钯浆催化碳烟氧化用PtCexZr1-xO2催化剂的制备及性能研究

Time:2021-12-24Number:713

采用水热晶化法一步制备了铈锆摩尔比不同的PtCexZr1-xO2系列催化剂,测定其比表面积、储氧量、氢气还原温度等物化性能参数,并进行结构表征,研究催化剂组成中铈锆摩尔比(nCe/nZr)对催化剂结构和性能的影响。结果表明,当nCe/nZr=5:5时,制备得到的PtCe0.5Zr0.5O2催化剂晶粒尺寸最小,储氧量较高,氢气还原温度低,微观结构为四方相和立方相2种晶型结构并存的固溶体。与传统贵金属浸渍负载方法制备的Pt/Ce0.5Zr0.5O2催化剂相比较,水热晶化法一步制备的PtCe0.5Zr0.5O2催化剂对碳烟的低温氧化具有更优的催化活性。

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关键词:催化化学;Pt-Ce-Zr催化剂;一步法;碳烟低温氧化

中图分类号:O643.3;TK431   

文献标识码:A   

文章编号:1004-0676(2021)02-0049-07

 Study on preparation and performance of PtCexZr1-xO2 catalysts for soot oxidation


 

ZHU Jing-fang1, 2, DU Ao-lin2, GAO Kun-yang2, CHANG Shi-ying1,

ZHAO Yun-kun1, 2, YANG Dong-xia1, PAN Zai-fu2, GU Yong-wan1 *

(1. Kunming Sino-platinum Metals Catalyst Co. Ltd., Kunming 650106, China; 2. State Key Laboratory Advanced Technologies of Comprehensive Utilization of Platinum Metals, Kunming Institute of Precious Metals, Kunming 650106, China)

 

Abstract: A series of PtCexZr1-xO2 catalysts were prepared by one-step hydrothermal crystallization method. The influences of the molar rate of Ce and Zr (nCe/nZr) on physical and chemical properties of the catalysts were investigated by specific surface area, oxygen storage capacity, reduction temperature test and X-ray diffractometer methods. The results showed that the catalyst with a ratio of nCe/nZr=5:5 had the smallest grain size, higher oxygen storage capacity, lower reduction temperature, and that the microstructure was solid solution nanoparticles with tetragonal and cubic phases. Compared with the Pt/Ce0.5Zr0.5O2 catalyst prepared by a traditional method, the PtCe0.5Zr0.5O2 catalyst prepared by one-step hydrothermal crystallization method had better catalytic activity for soot low-temperature oxidation.

Key words: catalyst chemistry; Pt-Ce-Zr catalyst; one-pot synthesis; soot low-temperature oxidation

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