Effect of structural and acidity/basicity changes of CuO–CeO2 catalysts on their activity for water–gas shift reaction

✍ Scribed by Petar Djinović; Janez Levec; Albin Pintar

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 582 KB
• Volume: 138
• Category: Article
• ISSN: 0920-5861
• DOI: 10.1016/j.cattod.2008.05.032

✦ Synopsis

The objective of this work was to investigate the influence of CuO loading and catalyst pretreatment procedure to derive an optimal CuO-CeO 2 catalyst for the water-gas shift reaction (WGS), and to study in detail structure-and surface acidity-activity relationships. Catalyst samples prepared by coprecipitation and a 10, 15 and 20 mol% CuO content were examined by XRD, BET and TPR/TPD analyses and subjected to pulse WGS activity tests in the temperature range of 180-400 8C. Strong structure-activity dependence in the WGS reaction was observed for all catalyst samples. It was established that increasing CuO content has a positive effect on H 2 production during the WGS reaction, due to favored CeO 2 reduction. Increasing calcination temperature on the other hand reduces the BET surface area, induced by CuO sintering and agglomeration of CeO 2 particles, resulting in a negative effect on H 2 production. Distinctive WGS activity dependence on surface acidity was observed and investigated.