<br>通过三段结晶法合成的小晶多级级 SAPO-11 分子筛及相应 NiWS 负载催化剂的加氢异构化性能,Fuel

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通过三段结晶法合成的小晶多级级 SAPO-11 分子筛及相应 NiWS 负载催化剂的加氢异构化性能
Fuel ( IF 6.7 ) Pub Date : 2022-05-19 , DOI: 10.1016/j.fuel.2022.124610
Xiaojun Dai , Yan Cheng , Qiang Wei , Meng Si , Yasong Zhou

为了制备具有高催化性能的非贵金属负载体加氢异构化催化剂，本工作首先提出了一种新颖的三段结晶方法合成小晶多级级 SAPO-11 分子筛，并制备了相应的 NiWS 负载体催化剂，用于正十六烷的加氢异构化。通过一系列表征方法分析了小晶多级 SAPO-11 分子筛和 NiWS 负载催化剂的物理化学性质。结果发现，SAPO-11-S 的晶体尺寸减小到 21.8 nm，粒径减小到 70-140 nm。SAPO-11-S 在孔隙性质和酸度上优于 SAPO-11-C。通过 29Si MAS NMR 表征研究了 SAPO-11-S 中强 B 酸位点数量增加的原因，并通过跟踪和分析 SAPO-11-S 的结晶过程提出了 SAPO-11-S 的形成机制。SAPO-11 分子筛晶体尺寸的减小有效提高了活性金属的硫化度和催化剂活性相的分散度，促进了更多的活性相形成“II 型活性相”。与 NiW/SAPO-11-C 相比，NiW/SAPO-11-S 表现出更高的催化活性和异构化选择性，NiW/SAPO-11-S 的最大异十六烷产率比 NiW/SAPO-11-C 高 44.77%。

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Small-crystal and hierarchical SAPO-11 molecular sieve synthesized via three-stage crystallization method and hydroisomerization performance of corresponding NiWS supported catalyst

In order to prepare non-noble metal supported hydroisomerization catalyst with high catalytic performance, this work first proposed a novel three-stage crystallization method to synthesize small-crystal and hierarchical SAPO-11 molecular sieve, and prepared the corresponding NiWS supported catalyst for the hydroisomerization of n-hexadecane. The physicochemical properties of the small-crystal and hierarchical SAPO-11 molecular sieve and the NiWS supported catalyst were analyzed via a series of characterization methods. It was found that the crystal size of SAPO-11-S was reduced to 21.8 nm and the particle size was reduced to 70–140 nm. SAPO-11-S was superior to SAPO-11-C in pore properties and acidity. The reason for the increase of the number of medium-strong B acid sites in SAPO-11-S was investigated by 29Si MAS NMR characterization, and the formation mechanism of SAPO-11-S was proposed by tracking and analyzing the crystallization process of SAPO-11-S. The decrease of crystal size of SAPO-11 molecular sieve effectively improved the sulfidation degree of active metals and the dispersion degree of the active phase of the catalyst, and promoted more active phases to form “type II active phase”. Compared with NiW/SAPO-11-C, NiW/SAPO-11-S showed higher catalytic activity and isomerization selectivity, and the maximum i-hexadecane yield of NiW/SAPO-11-S was 44.77% higher than that of NiW/SAPO-11-C.

更新日期：2022-05-19

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