CAJ | 학술논문

研究了不同硫化物在CeY上吸附后的红外光谱,总结了吸附作用机理;以噻吩作为模拟油中的硫化物,根据红外光谱信息研究烯烃对CeY分子筛选择性吸附脱硫性能的影响.结果表明,不同硫化物与CeY分子筛的作用方式不尽相同,但都在分子筛表面发生催化反应;CeY分子筛阳离子和烯烃的双键发生了σ-π络合,从而跟与CeY存在SM作用的噻吩形成了竞争吸附.噻吩存在下,烯烃在CeY表面发生了更为严重的催化反应,生成了大分子聚合物,占据吸附剂活性位的同时堵塞了分子筛表面孔道,导致CeY分子筛的脱硫性能显著降低.
연구료불동류화물재CeY상흡부후적홍외광보,총결료흡부작용궤리;이새분작위모의유중적류화물,근거홍외광보신식연구희경대CeY분자사선택성흡부탈류성능적영향.결과표명,불동류화물여CeY분자사적작용방식불진상동,단도재분자사표면발생최화반응;CeY분자사양리자화희경적쌍건발생료σ-π락합,종이근여CeY존재SM작용적새분형성료경쟁흡부.새분존재하,희경재CeY표면발생료경위엄중적최화반응,생성료대분자취합물,점거흡부제활성위적동시도새료분자사표면공도,도치CeY분자사적탈류성능현저강저.
FT-IR spectra of different kinds of sulfides adsorbed on CeY zeolite were collected. Based on that, the effect of olefins (with 1-octene, 1,5-hexadiene, and cyclohexene as model compounds) in FCC gasoline on the desulfurization performance of CeY were investigated. The results revealed that a ring-opening catalytic reaction occurs after the sulfides are adsorbed. As compared with alkyl thiophenes, benzo thiophenes are more stable. The strong interactions between the double bond in alkenes with the Ce cation in CeY lead to the formation of π-complexes through the σ-π electron donations, which competes with the SM function between thiophene and CeY. The amounts of polymers formed on the CeY surface increases with the concentration of alkenes, which may occupy the active sites and clog the pores in CeY; this will reduce the adsorptive selectivity for removing thiophene from the model fuel.