A Pd-Fe-B/γ-Al2O3 amorphous alloy catalyst was prepared by impregnation and chemical reduction with borohydrine aqueous solution. The catalyst was characterized by X-ray diffraction（XRD）, scanning electron microsc...A Pd-Fe-B/γ-Al2O3 amorphous alloy catalyst was prepared by impregnation and chemical reduction with borohydrine aqueous solution. The catalyst was characterized by X-ray diffraction（XRD）, scanning electron microscope（SEM）, differential scanning calorimetry（DSC） and elecdes design suite（EDS） and was used for catalytic hydrogenation of 5-nitro-2-chloro-2＇, 4＇-dimethylbenzenesulfonanilide （NCD）. The amorphous alloy catalyst shows significantly high activity and selectively for hydrogenation of NCD to 5-Amino-2-chloro- 2＇, 4＇-dimethyibenzenesuifonanilide （ACD）.展开更多
Amorphous MoNiB/γ/-Al2O3 alloy catalysts were prepared by reducing NiCI2.6H20 and （NH4）6Mo7O24.4H2O supported on γ-Al2O3 with NaBH4 as reducing agent. Using liquid-phase hydrogenation of furfural （FFR） as a prob...Amorphous MoNiB/γ/-Al2O3 alloy catalysts were prepared by reducing NiCI2.6H20 and （NH4）6Mo7O24.4H2O supported on γ-Al2O3 with NaBH4 as reducing agent. Using liquid-phase hydrogenation of furfural （FFR） as a probe reaction, the activity of MoNiB/γ/Al2O3 was examined. Compared to NiB and NiMoB, NiMoB/γ-Al2O3 exhibited excellent activity and selectivity towards furfuryl alcohol （FFA）. After reaction for 3.0 h at 80 ℃ and 5.0 MPa in methanol, FFR conversion reached 99% with FFA yield of 91%. The effects of doping amount of Mo and calcination temperature before NaBH4 reduction on hydrogenation activity were also investigated. The optimum Mo/Ni atom ratio and calcination temperature were found to be 1：7 and 300 ℃, respectively. XRD patterns and SEM images indicated that NiMoB over the surface of γ-Al2O3 was amorphous and highly dispersed, which was responsible for the high thermal stability of the title catalyst.展开更多
To decompose efficiently hydrogen cyanide （HCN） in exhaust gas, γ-Al2O3-supported bimetallicbased Cu-Ni catalyst was prepared by incipient-wetness impregnation method. The effects of the calcination temperature, H2...To decompose efficiently hydrogen cyanide （HCN） in exhaust gas, γ-Al2O3-supported bimetallicbased Cu-Ni catalyst was prepared by incipient-wetness impregnation method. The effects of the calcination temperature, H2O/HCN volume ratio, reaction temperature, and the presence of CO or O2on the HCN removal efficiency on the Cu-Ni/γ-Al2O3 catalyst were investigated. To examine further the efficiency of HCN hydrolysis, degradation products were analyzed. The results indicate that the HCN removal efficiency increases and then decreases with increasing calcination temperature and H2O/HCN volume ratio. On catalyst calcined at 400℃, the efficiency reaches a maximum close to 99% at 480 min at a H2O/HCN volume ratio of 150. The HCN removal efficiency increases with increasing reaction temperature within the range of 100v-500℃ and reaches a maximum at 500℃.This trend may be attributed to the endothern＇ficity of HCN hydrolysis; increasing the temperature favors HCN hydrolysis. However, the removal efficiencies increases very few at 500℃ compared with that at 400℃. To conserve energy in industrial operations, 400℃ is deemed as the optimal reaction temperature. The presence of CO facilitates HCN hydrolysis andincreases NH3 production. 02 substan.tially increases the HCN removal efficiency and NOx production but decreases NH3 production.展开更多
文摘A Pd-Fe-B/γ-Al2O3 amorphous alloy catalyst was prepared by impregnation and chemical reduction with borohydrine aqueous solution. The catalyst was characterized by X-ray diffraction（XRD）, scanning electron microscope（SEM）, differential scanning calorimetry（DSC） and elecdes design suite（EDS） and was used for catalytic hydrogenation of 5-nitro-2-chloro-2＇, 4＇-dimethylbenzenesulfonanilide （NCD）. The amorphous alloy catalyst shows significantly high activity and selectively for hydrogenation of NCD to 5-Amino-2-chloro- 2＇, 4＇-dimethyibenzenesuifonanilide （ACD）.
基金The authors are grateful to the Ministry of Science and Technology of the People’s Republic of China for financial support via the National 863 Developemnt Plan (2009AA05Z401)the Department of Science & Technology of Shandong Province for financial support from Shandong Natural Science Fund(ZR2009BL023)
文摘Amorphous MoNiB/γ/-Al2O3 alloy catalysts were prepared by reducing NiCI2.6H20 and （NH4）6Mo7O24.4H2O supported on γ-Al2O3 with NaBH4 as reducing agent. Using liquid-phase hydrogenation of furfural （FFR） as a probe reaction, the activity of MoNiB/γ/Al2O3 was examined. Compared to NiB and NiMoB, NiMoB/γ-Al2O3 exhibited excellent activity and selectivity towards furfuryl alcohol （FFA）. After reaction for 3.0 h at 80 ℃ and 5.0 MPa in methanol, FFR conversion reached 99% with FFA yield of 91%. The effects of doping amount of Mo and calcination temperature before NaBH4 reduction on hydrogenation activity were also investigated. The optimum Mo/Ni atom ratio and calcination temperature were found to be 1：7 and 300 ℃, respectively. XRD patterns and SEM images indicated that NiMoB over the surface of γ-Al2O3 was amorphous and highly dispersed, which was responsible for the high thermal stability of the title catalyst.
基金Acknowledgements This work is financially supported by the National Natural Science Foundation of China （Grant No. 21277064）, and the Scientific Research Key Project Fund of Ministry of Education （No. 210202）.
文摘To decompose efficiently hydrogen cyanide （HCN） in exhaust gas, γ-Al2O3-supported bimetallicbased Cu-Ni catalyst was prepared by incipient-wetness impregnation method. The effects of the calcination temperature, H2O/HCN volume ratio, reaction temperature, and the presence of CO or O2on the HCN removal efficiency on the Cu-Ni/γ-Al2O3 catalyst were investigated. To examine further the efficiency of HCN hydrolysis, degradation products were analyzed. The results indicate that the HCN removal efficiency increases and then decreases with increasing calcination temperature and H2O/HCN volume ratio. On catalyst calcined at 400℃, the efficiency reaches a maximum close to 99% at 480 min at a H2O/HCN volume ratio of 150. The HCN removal efficiency increases with increasing reaction temperature within the range of 100v-500℃ and reaches a maximum at 500℃.This trend may be attributed to the endothern＇ficity of HCN hydrolysis; increasing the temperature favors HCN hydrolysis. However, the removal efficiencies increases very few at 500℃ compared with that at 400℃. To conserve energy in industrial operations, 400℃ is deemed as the optimal reaction temperature. The presence of CO facilitates HCN hydrolysis andincreases NH3 production. 02 substan.tially increases the HCN removal efficiency and NOx production but decreases NH3 production.
