摘要
利用原位红外光谱技术,研究了噻吩在硫化态的负载型和分散型Mo催化剂表面的吸附行为。结果表明,在室温下,噻吩在硫化态Mo催化剂表面可发生微弱的化学吸附,在较高的真空度下脱附;噻吩主要以η~1(S)配位形式吸附在硫化态Mo催化剂表面类似于MoS_2结构边角的配位不饱和的Mo^(δ+)位上,硫原子与硫化态Mo催化剂上配位不饱和的Mo中心相互作用,降低了噻吩环的芳香性,从而增加了C=C电子云的密度,使C=C键增强、C—S键减弱,有助于加氢脱硫反应的进行。
The adsorption of thiophene on the sulfided supported Mo catalyst and sulfided dispersed Mo catalyst were studied by using in situ FT-IR technique. The results indicated that thiophene was weakly chemisorbed to the catalyst surface and could be desorbed at high vacuum at room temperature. The adsorption mode of thiophene on the surface of sulfided Mo catalyst was determined to be η^1（S） mode, in which thiophene molecule was bonded to the coordinated unsaturated sites （CUS） Mo^δ＋ located on the edge planes of MoS2 like structures. The interaction of sulfide atom with （CUS） Mo^δ＋ will decrease the aromaticity of thiophene molecule, sequentially increase the density of electron cloud of the bond C = C, enhance the bond C = C and weaken the bond C=S, which is favorable to the HDS reaction.
出处
《石油学报（石油加工）》
EI
CAS
CSCD
北大核心
2008年第6期657-662,共6页
Acta Petrolei Sinica(Petroleum Processing Section)
基金
山东省科技攻关项目(2007GG20007001)
山东省自然科学基金项目(2006ZR2203016)资助
关键词
噻吩
MO
吸附
加氢
thiophene
Mo
adsorption
hydrogenation
