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Influence of Pore Structure on Catalytic Properties of Mesoporous Silica‐supported Co‐B Amorphous Alloys in Hydrogenation of Cinnamaldehyde to Cinnamyl Alcohol
Author(s) -
Li Hui,
Liu Jun,
Yang Haixia,
Li Hexin
Publication year - 2009
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201090001
Subject(s) - cinnamyl alcohol , cinnamaldehyde , chemistry , mesoporous material , chemisorption , catalysis , amorphous solid , chemical engineering , mesoporous silica , selectivity , x ray photoelectron spectroscopy , crystallography , organic chemistry , engineering
Co‐B amorphous alloy catalysts supported on three kinds of mesoporous silica (common SiO 2 , MCM‐41 and SBA‐15) have been systematically studied focusing on the effect of pore structure on the catalytic properties in liquid‐phase hydrogenation of cinnamaldehyde to cinnamyl alcohol (CMO). Structural characterization of a series of different catalysts was performed by means of N 2 adsorption, X‐ray diffraction, transmission electron microscopy, hydrogen chemisorption, and X‐ray photoelectron spectroscopy. Various characterizations revealed that the pore structure of supports profoundly influenced the particle size, location and dispersion degree of Co‐B amorphous alloys. Co‐B/SBA‐15 was found more active and selective to CMO than either Co‐B/SiO 2 or Co‐B/MCM‐41. The superior catalytic activity could be attributed to the higher active surface area, because most of Co‐B nanoparticles in Co‐B/SBA‐15 were located in the ordered pore channels of SBA‐15 rather than on the external surface as found in Co‐B/SiO 2 and Co‐B/MCM‐41. Meanwhile, the geometrical confinement effect of the ordered mesoporous structure of SBA‐15 was considered to be responsible for the enhanced selectivity to CMO on Co‐B/SBA‐15, inhibiting the further hydrogenation of CMO to hydrocinnamyl alcohol.