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Adsorption and reaction of thiophene and H2S on Mo2C/Al2O3 catalyst studied by in situ FT-IR spectroscopy

机译：adsorption and reaction of thiophene and H2s on mo2C/al2O3 catalyst studied by in situ FT-IR spectroscopy

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摘要

The reactions of both thiophene and H2S onMo(2)C/Al2O3 catalyst have been studied by in situ FT-IR spectroscopy. CO adsorption was used to probe the surface sites of Mo2C/Al2O3 catalyst under the interaction and reaction of thiophene and H2S. When the fresh Mo2C/Al2O3 catalyst is treated with a thiophene/H-2 mixture above 473 K, hydrogenated species exhibiting IR bands in the regions 2800-3000 cm(-1) are produced on the surface, indicating that thiophene reacts with the fresh carbide catalyst at relatively low temperatures. IR spectra of adsorbed CO on fresh Mo2C/Al2O3 pretreated by thiophene/H-2 at different temperatures clearly reveal the gradual sulfidation of the carbide catalyst at temperatures higher than 473 K, while H2S/H-2 can sulfide the Mo2C/Al2O3 catalyst surface readily at room temperature (RT). The sulfidation of the carbide surface by the reaction with thiophene or H2S maybe the major cause of the deactivation of carbide catalysts in hydrotreating reactions. The surface of the sulfided carbide catalyst can be only partially regenerated by a recarburization using CH4/H-2 at 1033 K. When the catalyst is first oxidized and then recarburized, the carbide surface can be completely reproduced.
机译：噻吩和硫化氢在Mo（2）C / Al2O3催化剂上的反应已通过原位FT-IR光谱进行了研究。在噻吩和H2S的相互作用和反应下，用CO吸附法检测了Mo2C / Al2O3催化剂的表面位置。当将新鲜的Mo2C / Al2O3催化剂用高于473 K的噻吩/ H-2混合物处理时，在表面上会产生在2800-3000 cm（-1）区域显示IR带的氢化物质，这表明噻吩与新鲜的反应。碳化物催化剂在相对较低的温度下。噻吩/ H-2预处理后的新鲜Mo2C / Al2O3在不同温度下吸附的CO的红外光谱清楚地表明，碳化物催化剂在高于473 K的温度下逐渐硫化，而H2S / H-2可以硫化Mo2C / Al2O3催化剂表面容易在室温下（RT）。与噻吩或H2S的反应使碳化物表面硫化可能是加氢处理反应中碳化物催化剂失活的主要原因。硫化碳化物催化剂的表面只能通过在1033 K处使用CH4 / H-2进行再碳化来部分再生。当催化剂先被氧化然后再碳化时，碳化物表面可以完全再生。

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