Studies on CO oxidation performance of Pt/Au–TiO2 catalyst: role of high temperature reduction and gas discharge

IF 1.9 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
AVANTIKA GAUTAM, B TIRUMALA RAO, SHWETA VERMA, K V A N P S KUMAR, R K SHARMA, RAJIV KUMAR YADAV, L B RANA, MANOJ KUMAR
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引用次数: 0

Abstract

Noble metal like Pt or Au deposited on reducible oxides like TiO2 is one of the promising catalysts for CO oxidation, which has many applications including developing long-life sealed-off CO2 lasers, pollution control, etc. Catalytic oxidation of CO is pre-requisite for sealed-off CO2 lasers, because dissociation of lasing CO2 molecules in gas discharge decreases the laser power and may kill laser action in few minutes. Hence, this study was aimed to investigate the CO oxidation efficiency of in-house prepared Pt–TiO2 and Au–TiO2 catalysts, both at room temperature and under discharge conditions. The results of XPS and CO2 conversion measurements revealed that the post-reduction of catalyst plays a very important role for increasing the Pt0 and efficiency of CO oxidation to about 80%. Importantly, in the presence of gas discharge, considerably higher catalytic performance was observed for Pt–TiO2 catalyst with respect to their performance at room temperature and commercial gold (Au)-coated catalyst present in CO2 laser tubes.

Abstract Image

Pt/Au-TiO2 催化剂的 CO 氧化性能研究:高温还原和气体放电的作用
沉积在 TiO2 等还原性氧化物上的贵金属(如铂或金)是一种很有前景的一氧化碳氧化催化剂,它有很多应用,包括开发长寿命密封式二氧化碳激光器、污染控制等。催化 CO 氧化是密封式 CO2 激光器的先决条件,因为气体放电中激光 CO2 分子的解离会降低激光功率,并可能在几分钟内杀死激光作用。因此,本研究旨在研究内部制备的 Pt-TiO2 和 Au-TiO2 催化剂在室温和放电条件下的 CO 氧化效率。XPS 和 CO2 转化测量结果表明,催化剂的后还原在将 Pt0 和 CO 氧化效率提高到约 80% 方面起着非常重要的作用。重要的是,在气体放电条件下,Pt-TiO2 催化剂的催化性能大大高于它们在室温下的性能和二氧化碳激光管中的商用金(Au)涂层催化剂。
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来源期刊
Bulletin of Materials Science
Bulletin of Materials Science 工程技术-材料科学:综合
CiteScore
3.40
自引率
5.60%
发文量
209
审稿时长
11.5 months
期刊介绍: The Bulletin of Materials Science is a bi-monthly journal being published by the Indian Academy of Sciences in collaboration with the Materials Research Society of India and the Indian National Science Academy. The journal publishes original research articles, review articles and rapid communications in all areas of materials science. The journal also publishes from time to time important Conference Symposia/ Proceedings which are of interest to materials scientists. It has an International Advisory Editorial Board and an Editorial Committee. The Bulletin accords high importance to the quality of articles published and to keep at a minimum the processing time of papers submitted for publication.
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