Effects of precipitants on the catalytic performance of Cu/CeO2 catalysts for the water–gas shift reaction. Issue 19 (5th August 2021)

• Record Type: Journal Article
• Authors: Lee, Yong-Hee; Kim, Hak-Min; Jeong, Chang-Hoon; Jeong, Dae-Woon
• Is Part Of: Catalysis science & technology. Volume 11:Issue 19(2021)
• Page Start: 6380
• Page End: 6389
• Publication Date: 2021-08-05
• Subjects: Catalysis -- Periodicals; 541.395
• DOI: 10.1039/d1cy00964h
• Languages: English
• ISSNs: 2044-4753

Abstract

Abstract : The ratio of the precipitant (K2 CO3 : KOH) was confirmed to affect the Cu dispersion and OSC of the Cu/CeO2 catalyst, and the Cu/CeO2 catalyst prepared with the K2 CO3 : KOH ratio of 3 : 1 showed the highest activity. Abstract : The water–gas shift (WGS) reaction has been attracting interest for on-site small-scale production of hydrogen. This study discusses the fabrication of inexpensive, high-performance Cu/CeO2 catalysts. To synthesize these catalysts, CeO2 supports were prepared using K2 CO3 /KOH as precipitants in different ratios. First, 20 wt% Cu was loaded onto the prepared CeO2 supports through incipient wetness impregnation. The ratios of the precipitants affect the physicochemical properties of the Cu/CeO2 catalysts, which in turn affects the catalytic performance. On increasing the K2 CO3 /KOH ratio, the surface area, oxygen storage capacity, and reducibility increased, while Cu dispersion decreased. To achieve high activity of Cu/CeO2 catalysts, the CeO2 support should be synthesized at the K2 CO3 : KOH ratio of 3 : 1. This Cu/CeO2 catalyst exhibits the highest CO conversion between 200 and 400 °C, even at a very high gas hourly specific velocity of 50 102 h −1 . This result shows that the catalytic performance is greatly influenced by various physicochemical properties such as surface area, oxygen storage capacity, Cu dispersion, and reducibility.