New Approaches to the Synthesis of Ultralow-Palladium Automotive Emission Control Catalysts

IF 1.1 4区化学 Q4 CHEMISTRY, PHYSICAL Doklady Physical Chemistry Pub Date : 2023-02-20 DOI:10.1134/S001250162260019X

T. N. Rostovshchikova, M. I. Shilina, S. A. Gurevich, D. A. Yavsin, G. B. Veselov, A. A. Vedyagin

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引用次数: 3

Abstract

Laser electrodispersion has been used as an alternative to the chemical synthesis of palladium-containing catalysts. The thus produced catalysts supported on alumina and HZSM-5 zeolite have high catalytic activity and stability at ultralow palladium content (0.03 wt %) in a model reaction of CO oxidation under conditions of prompt thermal aging. According to X-ray photoelectron spectroscopy and transmission electron microscopy data, palladium in the catalyst samples predominantly occurs in the Pd⁰ state as fine particles about 2.0 nm in size, which almost completely cover the support surface. The textural characteristics of both supports are retained after the deposition of palladium. The modification of zeolite with palladium increases the adsorption capacity for hydrocarbons, which gives rise to a sorption effect in the temperature dependences of the CO conversion. The palladium-containing alumina-based catalyst demonstrated the best stability during heat treatment up to 1000°C.

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超低钯汽车尾气控制催化剂的合成新方法

激光电分散已被用作化学合成含钯催化剂的替代方法。制备的催化剂负载于氧化铝和HZSM-5沸石上，在超低钯含量(0.03 wt %)条件下，在快速热老化条件下的CO氧化模型反应中具有较高的催化活性和稳定性。根据x射线光电子能谱和透射电镜数据，催化剂样品中的钯主要以Pd0状态存在，尺寸约为2.0 nm，几乎完全覆盖载体表面。钯沉积后，两种支架的结构特征都被保留。钯改性沸石提高了对碳氢化合物的吸附能力，在CO转化的温度依赖性中产生了吸附效应。含钯铝基催化剂在高达1000℃的热处理过程中表现出最佳的稳定性。

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来源期刊

Doklady Physical Chemistry 化学-物理化学

CiteScore

1.50

自引率

0.00%

发文量

审稿时长

6-12 weeks

期刊介绍： Doklady Physical Chemistry is a monthly journal containing English translations of current Russian research in physical chemistry from the Physical Chemistry sections of the Doklady Akademii Nauk (Proceedings of the Russian Academy of Sciences). The journal publishes the most significant new research in physical chemistry being done in Russia, thus ensuring its scientific priority. Doklady Physical Chemistry presents short preliminary accounts of the application of the state-of-the-art physical chemistry ideas and methods to the study of organic and inorganic compounds and macromolecules; polymeric, inorganic and composite materials as well as corresponding processes. The journal is intended for scientists in all fields of chemistry and in interdisciplinary sciences.