钾改性铁钼碳化物催化剂及其CO加氢性能

Potassium doped Fe-Mo bimetallic carbide catalysts for higher alcohols synthesis from syngas

制备了碳化铁和钾掺杂碳化钼催化剂并对其CO加氢合成低碳混合醇性能进行了考察。结果表明当只有β-碳化钼存在时,产物主要是烃类以及微量的醇。经过钾改性后,β-碳化钼催化剂上产物低碳醇含量增加;而同时被碳化铁和钾改性后,低碳醇的含量进一步增加,并且高级醇(C2+OH)收率可达到0.14g/(mL·h)。β-碳化钼催化剂上醇烃产物均符合线性Anderson-Schultz-Flory(A-S-F)分布曲线,而钾改性β-碳化钼以及钾和碳化铁改性的催化剂上醇产物为独特的甲醇负偏离A-S-F分布。这表明钾和碳化铁的加入有效促进了C1OH到C2OH的链增长步骤,从而有利于C2+OH高级醇的生成。

The catalytic performances of iron carbide and potassium promoted molybdenum carbide catalysts are investigated for mixed alcohols synthesis from syngas.The results show that hydrocarbons and a trace of alcohols are formed over molybdenum carbide catalyst.The low carbon in alcohols products increase when the catalyst in promoted by potassium.When the β-molybdenum carbide catalyst is promoted by both iron carbide and potassium,the yield of C2+OH can reach 0.14 g/(mL·h).The distribution of hydrocarbons obeys the traditional linear Anderson-Schultz-Flory equation,while the distribution of alcohols gives a unique linear Anderson-Schultz-Flory with remarkable deviation of methanol.Thus,potassium and iron carbide promoter exerts a prominent function on the whole chain propagation to produce alcohols especially for the stage of methanol to ethanol.