المؤلفون: Tao Jiang, Kun Xu, Danni Kong, Fahai Cao

المصدر: Applied Petrochemical Research. 6:135-144

مصطلحات موضوعية: Aqueous solution, 010405 organic chemistry, Chemistry, Nickel oxide, Inorganic chemistry, chemistry.chemical_element, 010402 general chemistry, 01 natural sciences, 0104 chemical sciences, Catalysis, Cerium, Hydrogenolysis, General Earth and Planetary Sciences, Bimetallic strip, Cobalt oxide, Incipient wetness impregnation, General Environmental Science

الوصف: A series of Ni–Co bimetallic catalysts supported on γ-Al2O3 with different Ni/Co mass ratio were prepared by incipient wetness impregnation method for glycerol hydrogenolysis. The catalyst with a Ni/Co mass ratio of 1:3 (denoted as Ni1Co3) exhibited the highest conversion. The performance was compared with that of catalysts promoted by Ce. Moreover, the addition of Ce showed a remarkable promoting effect on the catalytic performance when the cerium content was 2.5 wt%. The physicochemical properties of the supported Ni–Co catalysts were characterized by N2 physisorption, XRD, H2-TPR, NH3-TPD, XPS and TEM. H2-TPR profiles revealed that the coexistence of Ni and Co components on support changed the respective reduction behavior of Ni or Co alone, showing the synergistic effect between Ni and Co species. Compared with the TPR profiles of Ni1Co3, it was clearly observed that the reduction peak of nickel oxide and/or cobalt oxide shifted down to the lower temperature zone gradually with the addition of Ce. It was most probable that the addition of Ce favored the formation of the strong interaction between metal species and ceria. The TEM images showed that the addition of Ce component could improve the dispersion of Ni–Co species on support and inhibited the agglomeration of metal particles during the reaction process, which might be responsible for the enhanced stability.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6c6b3a9c36d25f044a780242a77aeec0Test
https://doi.org/10.1007/s13203-015-0128-8Test

المؤلفون: Tao Jiang, Fahai Cao, Danni Kong, Kun Xu

المصدر: Applied Petrochemical Research. 5:221-229

مصطلحات موضوعية: Hydrogen, Inorganic chemistry, Sintering, chemistry.chemical_element, Catalysis, chemistry.chemical_compound, chemistry, Hydrogenolysis, Glycerol, General Earth and Planetary Sciences, Dehydrogenation, Bimetallic strip, Bond cleavage, General Environmental Science

الوصف: A series of Cu–Ni bimetallic catalysts were developed and used for glycerol hydrogenolysis to produce 1,2-propanediol in the absence of added hydrogen along with the isopropanol as hydrogen donor. The monometallic Cu catalyst can catalyze the dehydrogenation of isopropanol effectively, but the Cu species would be oxidized to Cu+ which led to the catalyst deactivation. Ni incorporation can change the reduction behavior of Cu catalyst and the formation of Cu–Ni alloy might promote the hydrogenation of acetol. Furthermore, the effect of ZnO incorporation on the catalytic performance of Cu–Ni/Al2O3 bimetallic catalyst for glycerol hydrogenolysis in the absence of added hydrogen was investigated. The addition of ZnO enhanced the acidity of catalyst surface, resulting in higher C–O bond cleavage activity. Comparing the H2-TPR profiles of Cu–Ni/Al2O3 with Cu–Ni/ZnO–Al2O3, it could be clearly observed that the reduction temperature was decreased remarkably by the addition of ZnO. XRD and SEM images revealed that the addition of ZnO inhibited the catalyst sintering and favored the formation of the strong interaction between Cu–Ni species and Al2O3 by the formation of the ZnAl2O4 phase.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::813e936822c8da639e52ad76f365dd5eTest
https://doi.org/10.1007/s13203-015-0125-yTest