SiO_2含量对Ni/SiO_2-Al_2O_3催化剂上H_2和O_2等温吸附的影响
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摘要
H_2和O_2吸附常用于金属催化剂的活性表面积、分散度、还原度和金属颗粒大小的测定.文章通过共沉淀制备不同SiO_2含量的60%Ni/SiO_2-Al_2O_3催化剂,并采用氢气和氧气的等温吸附进行表征.研究发现,随着SiO_2含量的增加,催化剂的H_2吸附量增大.SiO_2的加入不仅有利于催化剂镍颗粒的还原,促进镍颗粒的分散,而且使得催化剂中金属镍的粒径显著减小,活性表面积显著增大.
The Ni/SiO_2-Al_2O_3catalysts with different contents of SiO_2were prepared by co-precipitation method and characterized by the isothermal adsorption of H_2and O_2.The results showed that the H_2uptake of the catalysts was increased with the increase of SiO_2amount.The reducibility of metallic Ni in the catalysts was increased with the addition of SiO_2and the dispersion of Ni in the catalysts was enhanced.Thus,the particle sizes of metallic Ni in the catalysts were significantly decreased while the active areas of Ni were considerably increased with the increase of SiO_2content.
The Ni/SiO_2-Al_2O_3catalysts with different contents of SiO_2were prepared by co-precipitation method and characterized by the isothermal adsorption of H_2and O_2.The results showed that the H_2uptake of the catalysts was increased with the increase of SiO_2amount.The reducibility of metallic Ni in the catalysts was increased with the addition of SiO_2and the dispersion of Ni in the catalysts was enhanced.Thus,the particle sizes of metallic Ni in the catalysts were significantly decreased while the active areas of Ni were considerably increased with the increase of SiO_2content.
引文
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[4]PAKHARE D,SPIVEY J. A review of dry(CO2)reforming of methane over noble metal catalysts[J]. Chemical Society Reviews,2014,43(22):7813-7837.
[5]SEHESTED J.Four challenges for nickel steam-reforming catalysts[J]. Catalysis Today,2006,111(1):103-110.
[6]BRADFORD M C J,VANNICE M A.Catalytic reforming of methane with carbon dioxide over nickel catalysts I.Catalyst characterization and activity[J]. Applied Catalysis A:General,1996,142(1):73-96.
[7]DE S,ZHANG J,LUQUE R,et al.Ni-based bimetallic heterogeneous catalysts for energy and environmental applications[J]. Energy&Environmental Science,2016,9:3314-3347.
[8]SERP P,FEURER R,MORANCHO R,et al.A versatile one-step method for the preparation of highly dispersed metal supported catalysts[J]. Journal of Molecular Catalysis A:Chemical,1995,101(2):107-110.
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[10]ERMAKOVA M A,ERMAKOV D Y.High-loaded nickel–silica catalysts for hydrogenation,prepared by sol–gel:Route:structure and catalytic behavior[J]. Applied Catalysis A:General,2003,245(2):277-288.
[11]SAVVA P G,GOUNDANI K,VAKROS J,et al.Benzene hydrogenation over Ni/Al2O3catalysts prepared by conventional and sol–gel techniques[J]. Applied Catalysis B:Environmental,2008,79(3):199-207.
[12]ORTEGA-DOM NGUEZ R A,VARGAS-VILLAGR N H,PE ALOZA-ORTA C,et al.A facile method to increase metal dispersion and hydrogenation activity of Ni/SBA-15 catalysts[J]. Fuel,2017,198:110-122.
[13]SUPPINO R S,LANDERS R,COBO A J G.Effects of the activation method on the performance of base metal catalysts prepared by wet impregnation for toluene hydrogenation in liquid phase[J]. Reaction Kinetics,Mechanisms and Catalysis,2015,114(1):295-309.
[14]LI Guohui,HU Linjie,HILL J M.Comparison of reducibility and stability of alumina-supported Ni catalysts prepared by impregnation and co-precipitation[J]. Applied Catalysis A:General,2006,301(1):16-24.
[15]BURATTIN P,CHE M,LOUIS C.Metal particle size in Ni/SiO2materials prepared by deposition-precipitation:influence of the nature of the Ni(II)phase and of its interaction with the support[J]. The Journal of Physical Chemistry B,1999,103(30):6171-6178.
[16]STANISLAUS A,COOPER B H.Aromatic hydrogenation catalysis:A review[J]. Catalysis Reviews,1994,36(1):75-123.
[17]BARTHOLOMEW C H,FARRAUTO R J.Chemistry of nickel-alumina catalysts[J]. Journal of Catalysis,1976,45(1):41-53.
[18]MUSTARD D G,BARTHOLOMEW C H.Determination of metal crystallite size and morphology in supported nickel-catalysts[J]. Journal of Catalysis,1981,67(1):186-206.
[19]PANNELL R B,CHUNG K S,BARTHOLOMEW C H.Stoichiometry and poisoning by sulfur of hydrogen,oxygen and carbon-monoxide chemisorption on unsupported nickel[J]. Journal of Catalysis,1977,46(3):340-347.
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