Abstract
This study focuses on water–gas shift reaction (WGSR) activity of CuO–CeO 2 catalysts containing 10, 15 and 20 mol% CuO synthesized by hard template method with KIT-6 silica acting as a template. The obtained solids were characterized by N 2 adsorption/desorption, XRD, H 2-TPR/TPD, N 2O decomposition, in situ DRIFTS and NH 3 chemisorption/TPD methods. The catalysts exhibited ordered mesoporous structure, which was identified as the negative replica of KIT-6 silica pore system with CuO dispersion values between 28 and 40%. H 2-TPR/TPD experiments revealed facile and extensive CeO 2 reduction in tested samples, which increased with CuO loading, indicating strong interactions between both oxide phases. On the other hand, abundance of surface acidic sites decreased with increasing CuO content. WGS reaction activity was tested at the stoichiometric CO/H 2O ratio and low contact times in the temperature range from 250 to 450 °C. At reaction temperatures above 375 °C, catalyst deactivation was observed, regardless of CuO content. Despite rigorous reaction conditions, CO conversion up to 62% was attained, with H 2 selectivity above 99% in the entire temperature range.
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