摘要
制备了一系列不同pH值下共沉淀的Co-MoS_2的前驱体,并与无水碳酸钾机械混合、高温分解后得到K/Co-MoS_2催化剂。对催化剂XRD、SEM、TPR和XPS表征表明,沉淀环境的pH值对Mo和Co的共沉淀效果有显著影响,中性条件下共沉淀的催化剂相比酸性和碱性条件下得到的催化剂晶粒较小,Co和Mo原子间的相互作用也较强,从而更倾向生成复合Co-MoS晶相,因此,在合成气制低碳醇反应中也显示出最高的活性和C_2^+醇选择性。
Alkali doped monolith Co-MoS2 catalysts have attracted a lot of attention for their unique catalytic performance in carbon monoxide hydrogenation to mixed low carbon alcohols, especially the C2~＋alcohols. As a key step of alkali/Co-MoS2 catalysts preparation, the co-precipitation of molybdenum salt and cobalt salt affects the final states of Mo and Co species in the catalysts,which would show their different catalytic performance in the syngas conversion. In this work, Co-MoS2 precursors produced by coprecipitation of ammonium tetrathiomolybdate（ATTM） and cobaltous acetate in different acidic or basic conditions were mechanically mixed with potassium carbonate to obtain a series of K/Co-Mo S2 catalysts after pyrolysis. The XRD, SEM, TPR and XPS characterization results indicate that pH value of precipitation environment has a significant influence on the co-precipitation of Mo and Co salts. The catalyst prepared under neutral conditions showed smaller grain size and stronger interactions between Mo and Co atoms than the catalyst prepared under acid or basic conditions, and finally resulted in the highest activity and selectivity to C2~＋mixed low carbon alcohols.
作者
刘苏
周海波
宋庆英
LIU Su, ZHOU Hai-bo, SONG Qing-ying(Sinopec Shanghai Research Institute of Petrochemical Technology, Shanghai 201208, China)
出处
《天然气化工—C1化学与化工》
CAS
CSCD
北大核心
2018年第5期25-29,36,共6页
Natural Gas Chemical Industry
