合成气制醇钼硫基催化剂上吸附物种的红外光谱表征

利用现场ＦＴＩＲ方法对合成气制混合醇钼硫基催化剂上吸附物种进行了表征。结果表明，在反应条件下，非负载或ＳｉＯ２负载的碱助钼硫基催化剂上主要的ＣＯ加氢中间物种是ＨＣ＝Ｏ、ＣＨ２、ＨＣＯＳ、Ｏ－ＣＨ３及Ｓ＝ＣＨ３，而ＨＣＯＯ＾－和ＣＯ＾２－３的红外指纹谱带却十分弱，难以辨识。推断了该催化体系的反应历程。

IR Spectra of Chemisorbed Species on MoS_x-based Catalysts for Mixed Alcohols Synthesis from Syngas

The IR spectra of chemisorbed species on SiO2 supported,or unsupported,alkali-promoted MoSx-based catalysts for the mixed alcohols synthesis from syngas were taken in-situ under the reaction conditions of 538 K,2.0 MPa,and flowing feed stream of syngas(CO/H2=1,V/V),and ex-situ at 323 K,atmospheric pressure and under the controlled atmosphere.The results indicate that the detectable surface intermediates of CO hydrogenation are and that the IR bands as the fingerprints of and are ambiguous,and too weak to be sure of assignments.Based upon the results of the present IR investigation,the major reaction pathways of the syngas conversion over the MoSx-K+ catalysts are suggested.