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Solvent‐Free Synthesis and n ‐Hexadecane Hydroisomerization Performance of SAPO‐11 Catalyst
Author(s) -
Du Yanyan,
Feng Bing,
Jiang Ying,
Yuan Long,
Huang Keke,
Li Jiusheng
Publication year - 2018
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201800134
Subject(s) - chemistry , catalysis , bifunctional , yield (engineering) , solvent , hydrothermal circulation , hexadecane , metal , inorganic chemistry , nuclear chemistry , organic chemistry , chemical engineering , materials science , engineering , metallurgy
SAPO‐11 catalysts are prepared by both solvent‐free and hydrothermal methods. SAPO‐11 samples prepared by the solvent‐free method have a higher density of acid sites compared with the samples obtained by the hydrothermal method. We performed 29 Si NMR spectroscopy to determine the acid properties of the samples, and most Si species exist in the SAPO region. The SAPO‐11 materials were loaded with the noble metal Pt at a content of approximately 0.5 wt.‐%, and the bifunctional catalysts were applied in the hydroisomerization of n ‐hexadecane. Remarkably, a higher catalytic activity and isomer yield were obtained for the catalyst synthesized by the solvent‐free method. In particular, the higher yield of multibranched isomers, including dibranched and tribranched isomers, can be ascribed to the lower n Pt/ n A ratio (an expression of the balance between metal and acid sites) accompanied by the longer residence of carbenium ions at the acid sites. The solvent‐free samples can produce isomer products with lower pour points and enhanced low‐temperature mobility.