稀土Sm对于Cu/Zr基合成醇催化剂的改性作用

 采用BET，XRD，TPR，H2－TPD和NH3－TPD等表征手段，考察了稀土助剂Sm2O3的添加方式对Cu／Mn／Zr／Ni催化剂结构的影响，并与催化剂催化CO加氢合成醇反应的活性及选择性相关联．结果表明，加入稀土助剂后，催化剂的表面酸性明显增强，催化性能发生了很大变化，副产物烃和CO2的含量明显降低；反应过程中有大量二甲醚生成．此外，稀土助剂Sm2O3对催化剂有一定的电子改性作用，改变了催化剂表面的吸附行为．

Effect of Sm2O3 Promoter on Catalytic Performance of Cu/Mn/Zr/NiCatalyst for Alcohol Synthesis

Cu/Mn/Zr/Ni catalyst was prepared by co precipitation, and CO hydrogenation to alcohols was carried out in a fixed bed reactor to test the catalytic performance of Sm modified Cu/Mn/Zr/Ni catalyst under the condition of GHSV=3?000 h -1 and p =6.0 MPa. The different addition methods of Sm 2O 3 had different influences on the activity and selectivity of the catalyst. The catalyst prepared by co precipitation with Sm(NO 3) 3 enhanced the selectivity for CH 3OH, but inhibited the selectivity for alkane and CO 2, and exhibited strong acidity, producing a considerable amount of dimethyl ether. The added Sm 2O 3 played an important role in dispersion of the bulk Cu phase during the catalyst preparation and in stabilization of the small Cu particles during the catalyst calcination and reduction. Furthermore, Sm 2O 3 promoter had some electronic effect, and thus changed the adsorption behavior of the catalyst.