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Tailored Synthesis of Cu–CeO2–MgO Catalysts Enabling Modulation of Oxygen Storage Capacity and Dispersion for Hydrogen Production via HT-WGS Reaction
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DOI：10.1021/acs.iecr.5c03985.png)
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Abstract
En 中文
Catalytic activity is influenced not only by the metal and support but also by the preparation method, which has been demonstrated in numerous studies. In this study, Cu–CeO2–MgO catalysts were synthesized using four different preparation methods: Sol–gel (SG), Coprecipitation (CP), Incipient wetness impregnation (IWI), and Hydrothermal synthesis (HT). Their catalytic activities were evaluated in the high-temperature water–gas shift (HT-WGS) reaction using a practical waste-derived syngas composition. The catalysts synthesized by the hydrothermal method showed the high concentrations of active Cu species and large oxygen storage capacity complete (OSCC) values due to well-dispersed nanosized Cu particles, abundant oxygen vacancies and a high proportion of Ce3+ species. In catalytic performance tests, the Cu–CeO2–MgO catalyst prepared by the hydrothermal method achieved excellent CO conversion (75%) and long-term stability (30 h) at 500 °C due to the large amount of active Cu species and oxygen vacancies under the harsh condition of a gas hourly space velocity (GHSV) of 50,000 mL·g–1·h–1, even under a gas composition simulating waste-derived syngas (37.9 vol % CO).
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