The Methanation of CO₂ to CH₄ is a significant route to save energy and reduce CO₂ emission. In this work, a series of Cr₂O₃–Al₂O₃ powders were synthesized by a novel and simple solid-state method and considered as the carrier for the nickel catalysts in CO₂ methanation. The BET area and pore volume of the supports decreased with the decrease in Al₂O₃/Cr₂O₃ molar ratio. The results indicated that the increase in Cr₂O₃ content improved the catalytic performance and 15 wt%Ni/Cr₂O₃ catalyst exhibited the highest CO₂ conversion of 80.51%, and 100% CH₄ selectivity at 350 °C. The results indicated that the CO₂ conversion improved with the increment in H₂/CO₂ molar ratio from 2 to 5. The improvement in CO₂ conversion was also observed with decreasing GHSV due to the longer residence time of the reactants on the catalyst surface. Also, the results showed that increasing calcination temperature led to a decrease in CO₂ conversion. The 15 wt%Ni/Cr₂O₃ catalyst exhibited high stability in carbon dioxide methanation reaction.

将CO ₂甲烷化为CH ₄是节省能源和减少CO ₂排放的重要途径。在这项工作中，通过一种新颖而简单的固态方法合成了一系列Cr ₂ O ₃ -Al ₂ O ₃粉末，并被认为是CO ₂甲烷化中镍催化剂的载体。随着Al ₂ O ₃ / Cr ₂ O ₃摩尔比的减小，载体的BET面积和孔体积减小。结果表明，Cr ₂ O ₃含量的增加改善了催化性能，Ni / Cr的含量为15 wt％。₂ O ₃催化剂在350°C时具有80.51％的最高CO ₂转化率和100％CH ₄选择性。该结果表明，CO ₂转化率H中与增量提高₂ / CO ₂从2至5中的CO的改进摩尔比₂转化率也随观察GHSV由于在催化剂表面上反应物的停留时间较长。而且，结果表明，煅烧温度的升高导致CO ₂转化率的降低。15wt％Ni / Cr ₂ O ₃催化剂在二氧化碳甲烷化反应中显示出高稳定性。