Pd supported on alumina modified by phosphate: Highly phosphorus-resistant three-way catalyst for natural gas vehicles
Pd supported on alumina modified by phosphate: Highly phosphorus-resistant three-way catalyst for natural gas vehicles
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磷酸盐改性氧化铝负载钯：天然气汽车用高耐磷三元催化剂
DOI：
10.1016/j.jtice.2020.09.032
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发表时间：
2020-10
影响因子：
5.7
通讯作者：
Chen Yaoqiang
中科院分区：
文献类型：
--
作者：
Zhang Guochen;Chen Jianjun Chen;Wu Yang;Liu Xi;Qu Pengfei;Shen Puqing;Zhong Lin;Chen Yaoqiang
天然气汽车(NGV)二氧化碳排放较少，受到越来越多的关注。然而，需要催化剂来去除天然气汽车尾气中的一氧化碳、氮氧化物和未燃烧的甲烷等污染物。开发抗化学中毒，特别是抗NGV发动机润滑油磷中毒的催化剂是一项具有挑战性的工作。在这里，我们开发了一种新的策略来提高模型钯催化剂的抗磷性，使用磷酸改性氧化铝作为NGVS的载体。对催化剂进行了氮气物理吸附、X射线荧光光谱(XRF)、X射线衍射谱(XRD)、CO化学吸附、原位漂移和X射线光电子能谱(XPS)分析。结果表明，磷酸铝载体有助于模型催化剂保持其质构性质，否则润滑油中的磷物种会沉积在催化剂表面，阻碍催化剂的活性中心。此外，磷酸盐改性氧化铝载体上活性Pd0的相对含量不会降低。因此，与传统的氧化铝载体上的钯催化剂相比，磷改性氧化铝上的模型钯催化剂在NGVS的操作条件下可以显著提高抗磷性，并且在磷中毒时几乎保持其对污染物的催化性能。我们的工作将为开发高性能的NGV催化剂提供一种通用方法。
Natural gas vehicles (NGVs) have less CO2emission and have been attracting more attention. However, catalyst is needed to remove pollutants such as CO, NOxand unburned methane in NGVs’ exhausts. The development of catalysts with high resistance to chemical poisoning, especially to phosphorus poisoning induced by lubricating oil of NGVs’ engine, is a challenge. Herein, we developed a new strategy to improve the phosphorus resistance of model palladium catalyst using phosphate-modified alumina as support for NGVs. The catalysts were analyzed by N2-physisorption, X-ray fluorescence spectrum (XRF), X-ray diffraction (XRD), CO-chemisorption, in-situ DRIFTS and X-ray photoelectron spectrum (XPS). The results show that phosphate-alumina support helps the model catalyst maintain its textual properties, otherwise phosphorus species from lubricating oil would deposit on the surface of catalyst and block the catalytically active sites. Moreover, the relative content of active Pd0on phosphate-modified alumina support will not decrease. Therefore, compared with conventional Pd catalyst on alumina, the model Pd catalyst on phosphate-modified alumina can show significantly enhanced phosphorus resistance under operating conditions for NGVs, and can nearly maintain its catalytic performance of removing pollutants upon phosphorus poisoning. Our work would provide a general method for development of catalyst with high performance for NGVs.
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DOI：
10.1016/s0166-9834(00)81842-4
发表时间：
1985
期刊：
Applied Catalysis
影响因子：
--
作者：
W. B. Williamson;J. Perry;H. Gandhi;J. Bomback
通讯作者：
W. B. Williamson;J. Perry;H. Gandhi;J. Bomback
影响因子：
2.3
作者：
A. Raj
通讯作者：
A. Raj
影响因子：
5.5
作者：
Kast, Patrick;Friedrich, Matthias;Schloegl, Robert
通讯作者：
Schloegl, Robert
影响因子：
4.7
作者：
B. Angele;K. Kirchner
通讯作者：
B. Angele;K. Kirchner
影响因子：
5.5
作者：
F. Klingstedt;A. K. Neyestanaki;R. Byggningsbacka;L. Lindfors;M. Lundén;M. Petersson;Tengstroem Paulina;T. Ollonqvist;J. Väyrynen
通讯作者：
F. Klingstedt;A. K. Neyestanaki;R. Byggningsbacka;L. Lindfors;M. Lundén;M. Petersson;Tengstroem Paulina;T. Ollonqvist;J. Väyrynen