CAJ | 학술논문

以钛酸正丁酯作为钛源,MCM-41为载体,采用加热回流法合成了 TiO 2-MCM-41介孔分子筛(n (Si)/n (Ti)=5),并借助 XRD、FT-IR、N2吸附-脱附等表征手段研究了吸附剂的结构特性。以催化裂化汽油为油品进行静态脱硫和动态脱硫实验,结合使用固定床技术和色谱-硫化学发光检测(GC-SCD)偶联技术系统考查了吸附剂的选择性吸附脱硫性能及其对不同硫化物的选择性规律。结果表明,TiO 2在介孔分子筛 MCM-41的内孔壁能均匀分散；TiO 2与 MCM-41孔道表面的 SiO 2以 Si—O—Ti 键连接；MCM-41经负载 TiO 2后,吸附脱硫性能明显提高；TiO 2-MCM-41对 FCC 汽油中各种硫化物的选择性顺序为：四氢噻吩>2-甲基四氢噻吩≈C5硫醚>3,4-二甲基噻吩>2/3-乙基噻吩>2-乙基-5-甲基噻吩>噻吩>2,5-二甲基噻吩>C1-C3硫醇>2-甲基噻吩>2,3-二甲基噻吩>3-甲基噻吩>2,4-二甲基噻吩>苯并噻吩。
이태산정정지작위태원,MCM-41위재체,채용가열회류법합성료 TiO 2-MCM-41개공분자사(n (Si)/n (Ti)=5),병차조 XRD、FT-IR、N2흡부-탈부등표정수단연구료흡부제적결구특성。이최화열화기유위유품진행정태탈류화동태탈류실험,결합사용고정상기술화색보-류화학발광검측(GC-SCD)우련기술계통고사료흡부제적선택성흡부탈류성능급기대불동류화물적선택성규률。결과표명,TiO 2재개공분자사 MCM-41적내공벽능균균분산；TiO 2여 MCM-41공도표면적 SiO 2이 Si—O—Ti 건련접；MCM-41경부재 TiO 2후,흡부탈류성능명현제고；TiO 2-MCM-41대 FCC 기유중각충류화물적선택성순서위：사경새분>2-갑기사경새분≈C5류미>3,4-이갑기새분>2/3-을기새분>2-을기-5-갑기새분>새분>2,5-이갑기새분>C1-C3류순>2-갑기새분>2,3-이갑기새분>3-갑기새분>2,4-이갑기새분>분병새분。
TiO 2-MCM-41 mesoporous molecular sieve(n (Si)/n (Ti)= 5 )was synthesized by heating reflux method,using titanium tetrabutoxide as the Ti source,MCM-41 as the carrier.The samples were investigated by means of XRD,FT-IR and N2 adsorption/desorption.The static and dynamic desulfurization experiment was carried out using fluid catalytic cracking (FCC)fuel oils.Properties of selective adsorptive desulfurization of FCC gasoline on the adsorbents have been investigated in this paper by a fixed-bed adsorption experiment and a GC-SCD technique.It was indicated thatthe titania homodisperses in the modified MCM-41,titania connected with the pendant OH groups of MCM-41 via Si—O—Ti bonds.After the load of TiO 2 ,the properties of adsorptive desulfurization on the adsorbents weresignificantly improved.The removal selectivities of the sulfur compounds in the gasoline changed slightly before and after the load of TiO 2 ,while the poor removal selectivities of benzothiophene,2/3-methylthiophene,2,3-dimethylthiophene,2,4-dimethylthiophene and 2,5-dimethylthiophene on MCM-41 and TiO 2-MCM-41 were the same.