Abstract
A series of MCM-41 supported Ni catalysts with high metal dispersion was successfully synthesized by simple co-impregnation using proper ethylene glycol (EG). The acquired Ni-based catalysts performed the outstanding hydrogenolysis activity of guaiacol. The effects of the synthesis parameters including drying temperature, calcination temperature, and metal loading on the physical properties of NiO nanoparticles were investigated through the use of X-ray diffraction (XRD). The drying temperature was found to significantly influence the particle sizes of NiO supported on MCM-41, but the calcination temperature and metal loading had less influence. Interestingly, the small particle size (≤3.3 nm) and the high dispersion of NiO particles were also obtained for co-impregnation on the mixed support (MCM-41:HZSM-5 = 1:1), similar to that on the single MCM-41 support, leading to excellent hydrogenation activity at low temperature. The guaiacol conversion could reach 97.9% at 150 °C, and the catalytic activity was comparative with that of noble metal catalysts. The hydrodeoxygenation (HDO) performance was also promoted by the introduction of acidic HZSM-5 zeolite and an 84.1% yield of cyclohexane at 240 °C was achieved. These findings demonstrate potential applications for the future in promoting and improving industrial catalyst performance.
Highlights
In the chemical industry, supported metal catalysts, as the most widely used heterogeneous catalysts, have attracted extensive research [1]
Ni-based samples supported on MCM-41 and HZSM-5 were shortened to Ni/M and Ni/H, respectively
The Ni/M(H) 1EG catalyst was prepared by co-impregnation after mixing MCM-41 with 50 wt % HZSM-5 by milling
Summary
In the chemical industry, supported metal catalysts, as the most widely used heterogeneous catalysts, have attracted extensive research [1]. In order to obtain highly active heterogeneous catalysts, active metal components usually need to be loaded on the support materials with high specific surface area. To this purpose, highly ordered mesoporous materials have displayed extensive potential applications in purification and catalysis. Siliceous MCM-41 is regarded as an ideal support for supported metal catalysts due to its large surface area and high porosity, which is able to well disperse the active phase on the surface [2,3]. Catalytic hydrogenolysis of guaiacol is often considered to be the criterion for evaluating the hydrogenation and HDO activity of supported nickel catalysts, which is of commercial importance in the bio-oil hydro-refining industry [22]. For the purpose of probing the influences of preparation methods and additional introduction of HZSM-5 upon the catalytic properties of Ni/MCM-41, guaiacol hydrogenolysis was used for the catalytic test
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