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Pd Supported on Alumina Using CePO4 as an Additive: Phosphorus-Resistant Catalyst for Emission Control in Vehicles Fueled by Natural Gas
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-03-24 , DOI: 10.1021/acs.iecr.9b06997
Jianjun Chen 1 , Guochen Zhang 2 , Yang Wu 1 , Wei Hu 3 , Pengfei Qu 2 , Yun Wang 4 , Lin Zhong 2 , Yaoqiang Chen 1, 2, 5
Affiliation  

This work reports a novel strategy to improve phosphorus resistance of a model Pd catalyst on alumina using CePO4 as an additive, and the mechanism of phosphorus poisoning over the catalyst for methane removal under operational conditions was systematically investigated. The results demonstrated that phosphorus poisoning at 800 °C caused both harsh physical and chemical modifications in the Pd catalyst without the CePO4 additive; that is, the conversion of support aluminum oxide into a multilayer cristobalite-type aluminum phosphate led to considerable change of the catalyst texture and structure and remarkable blocking of Pd-active sites. However, CePO4 acting as a barrier layer can effectively suppress the formation of the inactive aluminum phosphate and also hinder the accumulation of Pd nanoparticles. Owing to the nearly maintaining of Pd-active sites, the modified catalyst shows much better performance (i.e., a wider λ window and a lower light-off temperature) with respect to resistance to phosphorus poisoning and thereby retains its activity of methane conversion.

中文翻译:

使用CePO 4作为添加剂负载在氧化铝上的Pd :耐磷催化剂,用于控制以天然气为燃料的车辆的排放

这项工作报告了一种新的策略,该方法使用CePO 4作为添加剂来改善氧化铝上的Pd催化剂模型的耐磷性,并且系统地研究了在操作条件下磷中毒对甲烷的去除作用,以去除甲烷。结果表明,在没有CePO 4添加剂的情况下,在800°C的磷中毒会导致Pd催化剂发生苛刻的物理和化学改性。就是说,载体氧化铝转化为方石英型磷酸铝的多层结构,导致了催化剂结构和结构的显着改变,以及钯活性位的显着封闭。但是,CePO 4用作阻挡层可以有效地抑制非活性磷酸铝的形成,并且还可以阻止Pd纳米粒子的积累。由于几乎保持了Pd活性位,因此改性催化剂在抗磷中毒方面表现出更好的性能(即,较宽的λ窗和较低的起燃温度),从而保留了其甲烷转化活性。
更新日期:2020-03-24
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