Abstract We studied the catalytic hydrogenation of CO2 to methane using nickel-niobia composite catalysts. Catalysts containing 10–70 wt% Ni were synthesized by wet impregnation and tested for CO2 hydrogenation in a flow reactor. 40 wt% was found to be the optimum Ni loading, which resulted in CO2 conversion of 81% at 325 °C. We also calcined the Nb2O5 support at different temperatures to study the influence of calcination temperature on the catalytic performance. 40 wt% Ni loaded on Nb2O5, which was calcined at 700 °C gave higher methanation activity (91% conversion of CO2). Time on stream study for 50 h showed a stable activity and selectivity; thus confirming the scope for practical application.

中文翻译：

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用于二氧化碳加氢制甲烷的高效镍-铌复合催化剂

摘要 我们研究了镍-铌复合催化剂催化CO2 加氢制甲烷的过程。含 10-70 wt% Ni 的催化剂通过湿浸渍法合成，并在流动反​​应器中测试 CO2 加氢。发现 40 wt% 是最佳 Ni 负载量，这导致在 325 °C 下 CO2 转化率为 81%。我们还在不同温度下煅烧 Nb2O5 载体，以研究煅烧温度对催化性能的影响。负载在 Nb2O5 上的 40 wt% Ni，在 700 °C 下煅烧可提供更高的甲烷化活性（CO2 转化率为 91%）。50 小时的在线研究显示出稳定的活性和选择性；从而确定了实际应用的范围。