超顺磁核-壳结构催化剂在裂化汽油烷基化脱硫中的应用  

Alkylation desulfurization of thiophene in FCC gasoline over superparamagnetic core-shell structure catalysts

作　　者：熊小龙[1,2] 刘自力[1,2] 徐阳阳[1,2] 黄旋燕[1,2] 崔斌[1,2] 

机构地区：[1]广州大学能源与催化研究所 [2]广州大学化学化工学院,广东广州510006

出　　处：《工业催化》2014年第3期187-193,共7页Industrial Catalysis

基　　金：国家自然科学基金(21076047;21276054)资助项目

摘　　要：通过可控液相沉积制备具有超顺磁性能的介孔核-壳结构Fe3O4@nSiO2@mSiO2-Al2O3和H3P12W40/Fe3O4@nSiO2@mSiO2-Al2O3催化剂。以噻吩和异戊烯组成的模拟汽油烷基化反应作为探针反应,考察催化脱硫性能,并采用FT-IR、N2等温吸附-脱附、NH3-TPD、VSM和SEM等方法对催化剂进行表征。结果表明,Fe3O4@nSiO2@mSiO2-Al2O3催化剂是具有超顺磁性和介孔结构特征的固体酸催化剂,其饱和磁化强度为46.3 emu·g-1,低矫顽力为零,比表面积为342.6 m2·g-1。模拟汽油在Fe3O4@nSiO2@mSiO2-Al2O3催化剂上170℃反应2 h,噻吩转化率为72.2%,负载质量分数40%的磷钨酸后,噻吩转化率达96.9%,催化活性、选择性和催化剂寿命均提高。Core-shell structure FenO3 @ nSiO2 @ mSiOz-A1203 and H3 P12 W40/Fe3O4 @ nSiO2 @ mSiO2- Al2O3 catalysts were prepared by controllable liquid phase deposition method. The desulfurization perform- ance of the catalysts was investigated using the alkylation of thiophene and iso-amylene as the probe reac- tion. The catalysts were characterized by FT-IR, BET, NH3-TPD, VSM and SEM. The results showed that Fe3O4@ nSiO2@ mSiO2-Al2O3 catalyst exhibited superparamagnetism and could be easily separated mag- netically, moreover, possessing the magnetization of 46.3 emu ~ g-1 and mesoporous structure with the surface area of 342.6 m2 ~ g - 1. Fe3 O4 @ nSiO2 @ mSiO2_A12 03 could accommodate to immobilize and dis- perse HPW. H3 P12 W40/Fe3O4 @ nSiO2 @ mSiO2-Al2O3 catalyst loading with 40wt% HPW was considered to be the proper catalyst for olefinic alkylation of thiophenic sulfur and could be separated in an external field. Thiophene conversion over Fe3O4 @ nSiO2 @ mSiOz-Al2O3 catalyst and H3 P12 W40/Fe3O4 @ nSiO2 @ mSiO2-Al2O3 catalyst were up to 72.2% and 96.9% ,respectively after reaction at 170℃ for 2 h. Its cata- lytic activity,selectivity and life were all increased in a certain degree after loading phosphotungstie acid.

关 键 词：催化化学 烷基化脱硫 磁性催化剂 FCC汽油 核-壳结构 磷钨酸 

分 类 号：O643.36[理学—物理化学] TE624.48[理学—化学]