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在 3 63～ 473 K,0 .1 MPa压力下 ,研究了 Cu-Fe-V2 O5/ Al2 O3催化剂上 CO2 催化加氢反应 ,对这些催化剂进行了 XRD及 TPR表征 ,并对 XRD结果和 TPR的“ROR”(还原 -氧化 -还原 )过程进行分析。结果显示 :在铜基催化剂中加入 Fe、V使其在 5 0 0 K以下的活性和选择性大为提高 ,且明显改善铜物种的分散度 ,影响催化剂表面的酸度。Fe、V浸渍的先后顺序对催化剂的性能亦有影响。Fe、V的加入及不同的浸渍顺序可能对催化剂上 Cu、Fe、V的分布状态及其相互作用有影响。室温下 ,催化剂上活性铜物种含量增加 ,有利于 H2的解离吸附及 CO2 的配位活化。
The catalytic hydrogenation of CO2 on Cu-Fe-V2 O5 / Al2 O3 catalysts was studied under pressure of 3 63 ~ 473 K and 0.1 MPa. The catalysts were characterized by XRD and TPR. The XRD results and TPR “ROR” (reduction - oxidation - reduction) process for analysis. The results showed that the addition of Fe and V to copper-based catalysts greatly enhanced the activity and selectivity below 500 K, significantly improved the dispersibility of copper species and the acidity of the catalyst surface. The order of Fe and V impregnation also has an influence on the performance of the catalyst. The addition of Fe and V and different impregnation sequences may have influence on the distribution of Cu, Fe and V and their interaction on the catalyst. At room temperature, the content of active copper on the catalyst increases, which is in favor of the dissociative adsorption of H2 and the coordination activation of CO2.