Abstract
Research is being actively conducted to improve the carbon deposition and sintering resistance of Ni-based catalysts. Among them, the Al2O3-supported Ni catalyst has been broadly studied for the dry reforming reaction due to its high CH4 activity at the beginning of the reaction. However, there is a problem of deactivation due to carbon deposition of Ni/Al2O3 catalyst and sintering of Ni, which is a catalytically active material. Supplementing MgO in Ni/Al2O3 catalyst can result in an improved MgAl2O4 spinel structure and basicity, which can be helpful for the activation of methane and carbon dioxide molecules. In order to confirm the optimal supports’ ratio in Ni/MgO-Al2O3 catalysts, the catalysts were prepared by supporting Ni after controlling the MgO:Al2O3 ratio stepwise, and the prepared catalysts were used for CO2 reforming of CH4 (CDR) using coke oven gas (COG). The catalytic reaction was conducted at 800 °C and at a high gas hourly space velocity (GHSV = 1,500,000 h−1) to screen the catalytic performance. The Ni/MgO-Al2O3 (MgO:Al2O3 = 3:7) catalyst showed the best catalytic performance between prepared catalysts. From this study, the ratio of MgO:Al2O3 was confirmed to affect not only the basicity of the catalyst but also the dispersion of the catalyst and the reducing property of the catalyst surface.
Highlights
Since the adoption of the Paris Agreement on Climate Change in 2015, it has been necessary to put in place measures to cut down greenhouse gas emissions to limit the increase in the global average temperature to 1.5 ◦C relative to preindustrial levels [1,2]
MgO-Al2O3 was prepared by the one-step coprecipitation method with different MgO:Al2O3 ratios as a support
To confirm the effect of the MgO:Al2O3 ratio in the Ni/MG catalyst for the dry reforming of coke oven gas (COG), Ni/MG catalysts were prepared with varying MgO:Al2O3 ratios (1:9, 3:7, 5:5, 7:3, 9:1)
Summary
Since the adoption of the Paris Agreement on Climate Change in 2015, it has been necessary to put in place measures to cut down greenhouse gas emissions to limit the increase in the global average temperature to 1.5 ◦C relative to preindustrial levels [1,2]. To achieve the CO2 levels required by the Paris Agreement, we must reach zero emissions by 2050 [1]. Fossil fuels account for 81% of the total energy consumption [5]. Greenhouse gas emissions in the form of by-products accounted for approximately 9% of global emissions from 1900 to 2015 [10]. The by-product gas of the steel industry is largely divided into coke oven gas (COG), which is generated in the process of producing coke by oxidizing coal in a coke oven, and CO2 generated in a blast furnace when iron oxide is reduced to iron [11]
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