CAJ | 학술논문

利用固定床、傅罩叶红外光谱(FT-IR)及频率响应(FR)等方法研究了1,5-己二烯和苯对NiY分子筛脱硫性能的影响机理.结果表明,吸附剂的选择性吸附脱硫性能随着模拟燃料中1,5-己二烯和苯含量的增加而显著降低,苯的影响比1,5-己二烯更显著.1,5-己二烯和苯影响NiY脱硫的机理不同,在吸附剂表面质子酸的作用下,烯烃与噻吩发生催化反应,噻吩开环生成烷基噻吩类大分子化合物,这类吸附堵塞分子筛的孔道,阻碍硫化物分子进入超笼与其中的金属阳离子吸附活性中心发生吸附作用.通过FR光谱观察,得知吸附过程是噻吩在NiY分子筛中传质过程的速控步骤,扩散过程是苯在NiY分子筛卜动力学过程的速控步骤,这使噻吩从吸附中心上置换下来的苯不易从分子筛孔道中扩散出去,从而阻碍了噻吩在吸附中心上的吸附.
이용고정상、부조협홍외광보(FT-IR)급빈솔향응(FR)등방법연구료1,5-기이희화분대NiY분자사탈류성능적영향궤리.결과표명,흡부제적선택성흡부탈류성능수착모의연료중1,5-기이희화분함량적증가이현저강저,분적영향비1,5-기이희경현저.1,5-기이희화분영향NiY탈류적궤리불동,재흡부제표면질자산적작용하,희경여새분발생최화반응,새분개배생성완기새분류대분자화합물,저류흡부도새분자사적공도,조애류화물분자진입초롱여기중적금속양리자흡부활성중심발생흡부작용.통과FR광보관찰,득지흡부과정시새분재NiY분자사중전질과정적속공보취,확산과정시분재NiY분자사복동역학과정적속공보취,저사새분종흡부중심상치환하래적분불역종분자사공도중확산출거,종이조애료새분재흡부중심상적흡부.
Effects of 1,5-hexadiene and benzene on the desulfurization property of NiY were investigated by Fourier transform-infrared (FT-IR), frequency-response (FR), and fixed-bed techniques. Results indicate that both 1,5-hexadiene and benzene inhibit the desulfurization of the sorbent which can be detected by a decrease in the desulfurization capacity of the NiY in the presence of 1,5-hexadiene and benzene in the model fuels. The effect of benzene on the adsorption capacity of the NiY was more conspicuous than that of 1,5-hexadiene. In the zeolite, the sulfur compounds and 1,5-hexadiene adsorbed on the protons can subsequently undergo an opening reaction of the heterocyclic rings, which blocks the zeolite pores and then hinders sulfide molecule access to the supercage where they could come into contact with metal cations. Distinct processes were observed in the FR spectra of thiophene and benzene on NiY zeolites, with the adsorption of thiophene in the supercage being the rate-controlling step and the diffusion process of benzene in the supercage being the rate-controlling step. The benzene molecules were replaced by thiophene molecules from the active centers and they, therefore, diffused out of the zeolite channels with difficulty. The adsorption of thiophene into the active centers will, therefore, be hindered.