Preparation of CuO/CeO₂ Catalyst with Enhanced Catalytic Performance for Water–Gas Shift Reaction in Hydrogen Production

Abstract

CuO/CeO2 is a promising catalyst for water–gas shift (WGS) reaction in H2 production. Much effort has been devoted to improving its catalytic activity and stability by CeO2 support modification or introduction of secondary active species. Here a method to enhance the catalytic performance by controlling the deposition rate of copper is reported. The nature of CuO and CuO‐CeO2 synergetic interaction are modulated by using different copper sources (Cu(NO3)2 and Cu[(NH3)] 42+ ) and controlling reaction temperatures. The as‐prepared CuO‐CeO2 catalysts show distinguish catalytic performances for the WGS reaction. The one prepared by using Cu[(NH3)] 42+ at the reaction temperature of 30 °C (CuCe‐30N) shows superior catalytic activity and stability. The CuCe‐30N catalyst possesses the largest Cu0 surface area (39.2 m2 gcat-1 ) and strongest CuO‐CeO2 synergetic interaction. The largest Cu0 surface area provides the most active sites for CO adsorption thus leading to its highest activity. The strong synergetic interaction prevents Cu crystallites from sintering during the WGS reaction, thus improving its thermal stability.

Recent Advances on the Rational Design of Non-Precious Metal Oxide Catalysts Exemplified by CuOx/CeO2 Binary System: Implications of Size, Shape and Electronic Effects on Intrinsic Reactivity and Metal-Support Interactions

“…The precipitating agent used could also exert a significant impact on the physicochemical properties of CuO x /CeO 2 catalysts, with the great implication in the catalytic behavior [207,292]. By employing ammonia water instead of ammonium and potassium carbonate, the WGSR activity is notably enhanced (91.7% CO conversion at 200 • C in contrast to 78.3% and 46.2%, respectively), due to the better dispersion of copper species and the stronger copper-ceria interactions [207].…”

“…By employing ammonia water instead of ammonium and potassium carbonate, the WGSR activity is notably enhanced (91.7% CO conversion at 200 • C in contrast to 78.3% and 46.2%, respectively), due to the better dispersion of copper species and the stronger copper-ceria interactions [207]. Moreover, the copper precursor compound (nitrate or ammonium ions) and the preparation temperature can notably affect the WGSR activity [292].…”

The roles and mechanism of cocatalysts in photocatalytic water splitting to produce hydrogen

“…Several metal oxides such as TiO2 [158][159][160][161], CuO [22,[162][163][164][165], Cu2O [49,166,167] and NiO [168] are well known as cocatalysts for photocatalytic H2 production. Table 5 summarizes the application of metal oxides and hydroxides as cocatalyst in the photocatalyst system for H2 evolution.…”

A Novel Composite Insulation System of Hollow Glass Microspheres and Multilayer Insulation with Self‐Evaporating Vapor Cooled Shield for Liquid Hydrogen Storage

“…However, they are still expected to reduce costs and improve efficiency further. [5][6][7][8][9] For hydrogen storage and transportation, there are mainly highpressure gaseous hydrogen storage, solidmaterial adsorption hydrogen storage, liquid hydrogen (LH 2 ) storage, and other storage methods such as liquid organic hydrogen carriers (LOHC). [10][11][12][13] Among them, the outstanding advantages of the LH 2 storage method are high energy storage density (liquid density is 700 times that of gas) and low pressure (normal pressure), and it has great application potential in large-scale hydrogen storage, such as hydrogen refueling stations and low-temperature propellants.…”