Open AccessSynthesis of SAPO-41 Molecular Sieves with Different SiO2/Al2O3 Ratios and their Catalytic Performance of n-Decane Hydroisomerization
Author(s) -
Han Wang,
Chunmu Guo,
Meng Ji,
Ting Li,
Le Luo,
Quan Wang,
Wei Wu
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/758/1/012080
Subject(s) - molecular sieve , decane , isomerization , catalysis , yield (engineering) , morphology (biology) , materials science , brønsted–lowry acid–base theory , phase (matter) , crystallography , chemical engineering , chemistry , nuclear chemistry , organic chemistry , composite material , biology , engineering , genetics
Using di-n-propylamine (DPA) as a template, SAPO-41 molecular sieves with SiO 2 /Al 2 O 3 ratios (n) of 0.3, 0.5, and 0.7 were synthesized. Their structure, morphology and acidity were characterized by XRD, N 2 physical adsorption, SEM, and Py-IR. All the synthesized samples have characteristic diffraction peaks corresponding to the AFO topological structure, which means that samples are pure phase SAPO-41 molecular sieve. The samples exhibited a highly ordered prismatic morphology with regular arrangement of individual grains, wrapped in flakes, and possessed complete channel structure. With the increase of n, the specific surface area and the amount of B acid showed a downward trend after increasing. Hydroisomerization reaction results of n-decane over SAPO-41 loaded with 0.5wt% Pd (Pd/SAPO-41(n)) showed that the higher the amount of B acid, the higher the conversion of n-decane,and high specific surface area and moderate B acid are favorable for yield of isomerization products. When the conversion of n-decane catalyzed by Pd/S41(0.3)-P was 88.9%, the yield of hydroisomerization products reached 83.3%.