利用表面活性剂合成含丰富介孔的EU-1分子筛

利用十二烷基苯磺酸钠、十六烷基三甲基溴化铵、JH聚羧酸高性能减水剂JH-01和JH-03等表面活性剂合成EU-1分子筛,并考察了不同表面活性剂对合成EU-1分子筛的影响。通过XRD,SEM,NH_3-TPD和N_2吸附-脱附等表征手段对合成样品进行物性表征及对其二甲苯异构化的催化性能进行评价。结果表明,添加这4种表面活性剂能够成功合成结晶度较高的EUO拓扑结构分子筛;与原样比较,其总比表面积、总孔体积、介孔表面积和介孔体积均明显增大。添加十二烷基苯磺酸钠表面活性剂的样品,其介孔体积最多可增加20.2%,极大降低了反应扩散限制,其二甲苯异构化活性从23.34%增大到23.62%,从而提高了EU-1分子筛的反应活性。

Preparation of mesoporous zeolite EU-1 with assistance of surfactants

Surfactants such as sodium dodecylbenzene sulfonate (SDBS), hexadecyl trimethyl ammonium bromide, JH polycarboxylate water reducer JH-01 and JH-03 were used separately to prepare zeolite EU-1. Effect of different surfactant on the preparation of zeolite EU-1 was studied. The zeolite EU-1 was characterized by XRD, SEM, NH3-TPD and N2 adsorption-desorption. The catalytic performance evaluation of xylene isomerization of zeolite EU-1 samples was carried out. The results showed that zeolite of EUO topological molecular structure with higher degree of crystallinity can be prepared by adding the above-mentioned four kinds of surfactant, and as comparing with the original sample, the total specific surface area, total pore volume, the mesoporous surface area and the mesoporous volume were increased significantly. Mesoporous volume of the sample that prepared with addition of sodium dodecylbenzene sulfonate increases by up to 20.2% and the reaction diffusion constraints is obviously reduced. The isomerization activity of xylene by the use of zeolite EU-1 increases from 23.34% to 23.62%. This result reflects that the reaction activity of zeolite EU-1 is improved effectively by the use of the surfactant.