分子筛
催化作用
介孔材料
化学
化学工程
无机化学
核化学
材料科学
有机化学
工程类
作者
Xiaojun Dai,Yan Cheng,Meng Si,Qiang Wei,Dongdong Chen,Weixing Huang,Yasong Zhou
出处
期刊:Fuel
[Elsevier]
日期:2022-04-01
卷期号:314: 123131-123131
被引量:13
标识
DOI:10.1016/j.fuel.2022.123131
摘要
• SAPO-11 molecular sieve with improved acidity, mesoporous volume and hydroisomerization performance was synthesized by reducing the water content in the synthesis system to form concentrated gel. • The effect of the reduction of water content in the synthesis system of SAPO-11 on the properties of the active phase of NiW supported catalysts was studied. • It is proposed that hydroisomerization of n-hexadecane on NiW/SAPO-11 catalyst follows the pore-mouth mechanism. A series of SAPO-11 molecular sieves were synthesized in the concentrated gel system by reducing the water content in the synthesis system. With SAPO-11 molecular sieves as supports, NiW-supported catalysts were prepared for the hydroisomerization of n-hexadecane. SAPO-11 molecular sieves and catalysts were characterized by XRD, SEM, N 2 adsorption–desorption, NH 3 -TPD, Py-IR, HRTEM and XPS. The results showed that reducing the water content in the synthesis system could increase the mesoporous volume of SAPO-11 molecular sieve and improve the acidity of SAPO-11. For the corresponding catalysts, using SAPO-11 synthesized in concentrated gel system as the support weakened the interaction between the active phase and the support, and increased the dispersion and stacking number of the active phase, which effectively improved the catalytic performance of the catalyst. The yield of i-hexadecane of the catalyst NiW/45W-SA corresponding to SAPO-11 synthesized in conventional water content system was 28.14%, while that of the catalyst NiW/5W-SA corresponding to SAPO-11 synthesized in concentrated gel system was 52.24%. According to the distribution of isomers, it is inferred that hydroisomerization of n-hexadecane over NiW/SAPO-11 follows the pore-mouth mechanism.
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