异丙醇对合成13X分子筛的结构和吸附性能的影响

Effect of Isopropanol on Structure of Synthesis 13X Zeolite and its Adsorption Performance

摘要:

利用XRD、SEM、BET、ICP-AES等手段，对常规水热13X分子筛合成体系中加入不同量异丙醇合成的分子筛进行表征。结果发现，随着合成体系中异丙醇量增加，分子筛的相对结晶度、晶粒尺寸、以及分子筛硅铝比均减小；分子筛的孔容、孔径均增大。将分子筛样品在含1000ppm二甲醚（DME）的乙烯原料以1500h-1体积空速下，应用于乙烯中甲醇、二甲醚等含氧化合物的脱除实验表明，小晶粒、大孔容分子筛样品表现出更好的吸附性能。在合成体系中加入15wt%异丙醇的分子筛样品吸附性能更好，其单程寿命达到280min，单位时间（h）内的积炭量0.71%。

Abstract:

The structure, particle size distribution and adsorption performance of 13X zeolites obtained by hydrothermal synthesis system with isopropanol were characterized by XRD, SEM, BET, and ICP-AES etc. It is concluded that with the increasing amount of isopropanol in the synthesis system, 13X zeolites’ relative crystalline, grain size and the silica/alumina ratio are decreased; the pore volume and average pore size are increased. The samples were investigated in removing oxygenates (methanol, DME, etc.) from ethylene under the condition of 1500h-1 (GHSV) and with 1000ppm DME in the feed flow. The results showed that the samples with smaller grain size and larger pore volume had better adsorption performance, Compared with other samples, the sample synthesized from the synthesis system containing 15wt% isopropanol exhibited the best performance, the on stream lifetime reached 280min, and the coking rate was 0.71%/h.