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VO x /γ‐Al 2 O 3 Catalysts for Propane Dehydrogenation Prepared by “Impregnation‐Solid Phase Reaction” Method with Aluminum Hydroxide as Support Precursor
Author(s) -
Yang QiQi,
Hu Ping,
Xiu NaiYun,
Lang WanZhong,
Guo YaJun
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201802070
Subject(s) - dehydrogenation , catalysis , propene , vanadium , hydroxide , propane , x ray photoelectron spectroscopy , inorganic chemistry , materials science , desorption , vanadium oxide , adsorption , chemistry , chemical engineering , organic chemistry , engineering
The alumina supported vanadium oxide catalysts (VO x /γ‐Al 2 O 3 ) were prepared by wet impregnation‐solid phase reaction method with aluminum hydroxide as support precursor. The prepared catalysts were characterized by N 2 adsorption–desorption, UV–vis, X‐ray photoelectron spectroscopy and Raman spectroscopy. The performances of the catalysts were tested for propane dehydrogenation (PDH) reaction. The results indicate that the loading of vanadium on the aluminum hydroxide can influence the surface morphology of the catalysts and greatly improve the specific surface area of the resulted VO x /γ‐Al 2 O 3 compared to pure γ‐Al 2 O 3 support. The vanadium content markedly influences the polymerization degree of surface VO x species and catalytic performances of VO x /γ‐Al 2 O 3 catalysts for PDH. Among all samples, the 2.9VO X /γ‐Al 2 O 3 catalyst (vanadium content is 2.9 wt.%) possesses the maximum specific surface area and harmonious polymerization degree of VO X species. It exhibits the best catalytic performances during the 8 h of PDH reaction. Meanwhile, the 2.9VO x /γ‐Al 2 O 3 catalyst possesses high regeneration stability and the highest TOF (turnover frequencies) value of 9.0×10 −3 s −1 , which is evidently higher those of previous works. After 7 reaction–regeneration cycles, the initial activity and propene selectivity can be almost restored.