Synthesis of ZSM-22/SAPO-11 composite molecular sieve-based catalysts with small crystallites and superior n-alkane hydroisomerization performance

被引:6
|
作者
Wang, Xue-Man [1 ]
Wen, Cheng-Long [2 ]
Fan, Yu [1 ]
机构
[1] China Univ Petr, State Key Lab Heavy Oil Proc, Beijing, Peoples R China
[2] Changzhou Univ, Adv Catalysis & Green Mfg Collaborat Innovat Ctr, Sch Petrochem Engn, Jiangsu Key Lab Adv Catalyt Mat & Technol, Changzhou 213164, Jiangsu, Peoples R China
关键词
ZSM-22/SAPO-11 composite molecular; sieves; Medium and strong bronsted acid centers; Crystallite size; BranchedC10; isomers; ZSM-22; ZEOLITE; ISOMERIZATION; DODECANE; SAPO-11; BETA;
D O I
10.1016/j.petsci.2023.03.002
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
To improve oil quality, ZSM-22/SAPO-11 composite molecular sieves were synthesized by adding ZSM-22 into a synthetic gel of SAPO-11 for n-decane hydroisomerization. The mass ratios of ZSM-22/(ZSM22+SAPO-11) in the composite molecular sieves were optimized and the optimal ZSM-22/SAPO-11 composite (ZS-9) was obtained. The electrostatic repulsions between the ZSM-22 precursors and the SAPO-11 crystalline nuclei produced small ZSM-22 and SAPO-11 crystallites in ZS-9, which increased the specific surface area and mesopore volume and thereby exposed more acid sites. In comparison with conventional SAPO-11, ZSM-22 and their mechanical mixture, ZS-9 with smaller crystallites and the optimal medium and strong Bronsted acid centers (MSBAC) content displayed a higher yield of branched C10 isomers (81.6%), lower cracking selectivity (11.9%) and excellent stability. The correlation between the i-C10 selectivity and the MSBAC density of molecular sieves indicated that the selectivity for branched C10 isomers first increased and then decreased with increasing MSBAC density on the molecular sieves, and the maximum selectivity (87.7%) occurred with a density of 9.6 x 10-2 mmol m-2. & COPY; 2023 The Authors. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/ 4.0/).
引用
收藏
页码:2585 / 2595
页数:11
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