Superior catalytic performance of micro-mesoporous Beta-SBA-15 composite with a high indexed isomerization factor in hydroisomerization of n-heptane. (15th September 2019)

• Record Type: Journal Article
• Authors: Gao, Li; Shi, Zhiyuan; Etim, Ubong Jerome; Wu, Pingping; Xing, Wei; Zhang, Yi; Bai, Peng; Yan, Zifeng
• Is Part Of: Fuel. Volume 252(2019)
• Page Start: 653
• Page End: 665
• Publication Date: 2019-09-15
• Subjects: Indexed isomerization factor -- Hydroisomerization -- n-Heptane -- Micro-mesoporous composites -- Beta-SBA-15; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2019.04.156
• Languages: English
• ISSNs: 0016-2361

Abstract

Graphical abstract: Highlights: Beta-SBA-15 composite was synthesized by a two-step hydrothermal crystallization method. Pt/HBS catalyst exhibited superior performance in hydroisomerization of n-heptane. High diffusion efficiency and suitable acidity endow Beta-SBA-15 excellent performance. Index isomerization factor (IIF) reliably predicts the isomerization performance of catalysts. Abstract: A composite material Beta-SBA-15 (BS) comprising zeolite Beta units and SBA-15-like mesoporous structure was hydrothermally synthesized and served as catalyst support for the hydroisomerization of n-heptane. Materials were characterized by a variety of techniques. Characterization results revealed that Beta-SBA-15 composite has a two-dimensional hexagonal mesoporous channel with a pore size of 6.4 nm and a high concentration of moderate-strength acid sites. Evaluation results showed that Pt/HBS exhibited a relatively high n-heptane conversion (75.57%) with a good selectivity to isoheptanes (90.04%), resulting in the highest isoheptanes yield (68.04%) among all samples. The micro-mesoporous composite structure with moderate surface acidity enhanced diffusion of large isomerized intermediates as well as inhibiting the occurrence of cracking side reactions, achieving a high isoheptanes yield. Experimental data demonstrates that the indexed isomerization factor (IIF) as a performance descriptor can accurately predict the isomerization performance of catalysts.