The deactivation of Ni/SiO2-Al2 O3 catalyst in hydrogenation of crude 1,4-butanediol was investigated.During the operation time of 2140 h,the catalyst showed slow activity decay.Characterization results,for four spent...The deactivation of Ni/SiO2-Al2 O3 catalyst in hydrogenation of crude 1,4-butanediol was investigated.During the operation time of 2140 h,the catalyst showed slow activity decay.Characterization results,for four spent catalysts used at different time,indicated that the main reason of the catalyst deactivation was the deposition of carbonaceous species that covered the active Ni and blocked mesopores of the catalyst.The TPO and SEM measurements revealed that the carbonaceous species included both oligomeric and polymeric species with high C/H ratio and showed sheet.Such carbonaceous species might be eliminated through either direct H2 reduction or the combined oxidation-reduction methodologies.展开更多
The Ni/Al2O3 catalysts were prepared by two impregnation methods: common and promoted with support salt, for CH4/CO2 reforming and studied by using TPR, TPD, TPMC（Temperature programmed methane decomposition carbon d...The Ni/Al2O3 catalysts were prepared by two impregnation methods: common and promoted with support salt, for CH4/CO2 reforming and studied by using TPR, TPD, TPMC（Temperature programmed methane decomposition carbon deposition） and activity test techniques. The results showed that the coke formation of the catalysts promoted with support salt（aluminium nitrate） was reduced to one sixth and the dispersion increased by 72.7% in comparison with catalyst prepared by common impregnation method. The interactions between Ni and Al with O on the surface of the support salt promoted catalyst appeared stronger.展开更多
基金Supported by the National Natural Science Foundation of China(21673132).
文摘The deactivation of Ni/SiO2-Al2 O3 catalyst in hydrogenation of crude 1,4-butanediol was investigated.During the operation time of 2140 h,the catalyst showed slow activity decay.Characterization results,for four spent catalysts used at different time,indicated that the main reason of the catalyst deactivation was the deposition of carbonaceous species that covered the active Ni and blocked mesopores of the catalyst.The TPO and SEM measurements revealed that the carbonaceous species included both oligomeric and polymeric species with high C/H ratio and showed sheet.Such carbonaceous species might be eliminated through either direct H2 reduction or the combined oxidation-reduction methodologies.
基金supported by the National Natural Science Foundation of China(21703194)the Natural Science Foundation of Jiangsu Province(BK20171168,BK20171169)+2 种基金Natural Science Foundation of Jiangsu Higher Education Institutions of China(17KJB530010,17KJB150038 and18KJA430015)Key Research Project of Social Development of Xuzhou(KC17154)Research Project of Xuzhou University of Technology(XKY2017217)
文摘The Ni/Al2O3 catalysts were prepared by two impregnation methods: common and promoted with support salt, for CH4/CO2 reforming and studied by using TPR, TPD, TPMC（Temperature programmed methane decomposition carbon deposition） and activity test techniques. The results showed that the coke formation of the catalysts promoted with support salt（aluminium nitrate） was reduced to one sixth and the dispersion increased by 72.7% in comparison with catalyst prepared by common impregnation method. The interactions between Ni and Al with O on the surface of the support salt promoted catalyst appeared stronger.
