Abstract
Waste to energy technology is attracting attention to overcome the upcoming environmental and energy issues. One of the key-steps is the water-gas shift (WGS) reaction, which can convert the waste-derived synthesis gas (H2 and CO) to pure hydrogen. Co–CeO2 catalysts were synthesized by the different methods to derive the optimal synthetic method and to investigate the effect of the preparation method on the physicochemical characteristics of Co–CeO2 catalysts in the high-temperature water-gas shift (HTS) reaction. The Co–CeO2 catalyst synthesized by the sol-gel method featured a strong metal to support interaction and the largest number of oxygen vacancies compared to other catalysts, which affects the catalytic activity. As a result, the Co–CeO2 catalyst synthesized by the sol-gel method exhibited the highest WGS activity among the prepared catalysts, even in severe conditions (high CO concentration: ~38% in dry basis and high gas hourly space velocity: 143,000 h−1).
Highlights
Economic development and population growth have increased the amount of globally generated waste, which is expected to rise from 2.0 billion tons per year in 2016 to 3.4 billion tons per year in2050 [1,2]
Co–CeO2 catalysts prepared by various synthetic methods were applied for the high-temperature water-gas shift (HTS) reaction of waste-derived synthesis gas
The outstanding performance of the developed catalyst was ascribed to the high concentration of oxygen vacancies, which is related to the strong metal-support interaction
Summary
Economic development and population growth have increased the amount of globally generated waste, which is expected to rise from 2.0 billion tons per year in 2016 to 3.4 billion tons per year in2050 [1,2]. Economic development and population growth have increased the amount of globally generated waste, which is expected to rise from 2.0 billion tons per year in 2016 to 3.4 billion tons per year in. Much attention has been directed at the development of waste to energy technologies such as waste gasification to reduce the extent of landfill depletion, environmental pollution, and waste treatment costs [3,4,5]. Waste gasification typically affords synthesis gas (H2 and CO), which can be used to generate value-added products such as synthetic crude oil, methanol, and dimethyl ether, and can be employed as a substitute of reformed natural gas for pure H2 production through the water-gas shift (WGS) reaction (CO + H2 O → CO2 + H2 ) [4,6,7,8,9]. More than 96% of H2 is generated from natural gas- and petroleum-derived sources (i.e., from fossil fuels), which highlights the need for practical
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