Zhongguo youzhi (Oct 2022)
介孔Pt/SAPO-11的制备工艺优化及其催化油酸脱羧制备航空煤油性能评价Optimization of preparation of mesoporous Pt/SAPO-11 and its performance evaluation for the production of aviation kerosene by decarboxylation of oleic acid
Abstract
为提高SAPO-11分子筛在催化油酸脱羧制备航空煤油主要成分C8~C17烷烃的催化反应效果，以聚环氧乙烷-聚环氧丙烷-聚环氧乙烷三嵌段共聚物(P123)和十二烷基三甲基溴化铵(DTAB)为介孔双模板剂，采用原位合成法制备了介孔Pt/SAPO-11分子筛催化剂，探究不同晶化温度、晶化时间和煅烧温度对介孔Pt/SAPO-11结晶度、孔结构、形貌特征的影响，并考察其催化油酸脱羧制备C8~C17烷烃效果。结果表明：在晶化温度190 ℃、晶化时间36 h、煅烧温度650 ℃、煅烧时间5 h时，合成的介孔Pt/SAPO-11具有较大的比表面积、较高结晶度、较合适孔径和较好的形貌特征；在油酸脱羧制备C8~C17烷烃的反应中，在反应温度340 ℃、剂油比1∶ 10、反应时间6 h 时，C8~C17烷烃收率可达78.3%。 In order to improve the catalytic reaction effect of SAPO-11 molecular sieve in catalyzing the decarboxylation of oleic acid to prepare C8-C17 alkanes, using polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer (P123), and dodecyl trimethyl ammonium bromide (DTAB) as mesoporous double template agents, the mesoporous Pt/SAPO-11 molecular sieve catalyst was prepared by in-situ synthesis method,and the effects of different crystallization temperature, crystallization time and calcination temperature on the crystallinity, pore structure and morphology of mesoporous Pt/SAPO-11 were studied. Also it was uesed for the preparation of C8-C17 alkanes by decarboxylation of oleic acid. The results showed that when the crystallization temperature was 190 ℃, the crystallization time was 36 h, the calcination temperature was 650 ℃, and the calcination time was 5 h, the synthesized mesoporous Pt/SAPO-11 had a larger specific surface area, higher crystallinity, more suitable bore size and better morphological characteristics. In the reaction of oleic acid decarboxylation to prepare C8-C17 alkanes, when the reaction temperature was 340 ℃, the catalyst-oil ratio was 1∶ 10, and the reaction time was 6 h, the yield of C8-C17 alkanes could reach 78.3%.
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