Using Ti0.5Zr0.5O2(TZ) as carrier, the CuO/TZ catalysts were prepared by impregnation method with Cu(NO3)2 as active component, their activities were investigated by using a microreactor-GC NO+CO reaction system, TPR,...Using Ti0.5Zr0.5O2(TZ) as carrier, the CuO/TZ catalysts were prepared by impregnation method with Cu(NO3)2 as active component, their activities were investigated by using a microreactor-GC NO+CO reaction system, TPR, TG-DTA, XRD and NO-TPD. Experimental results showed that the fine crystallite of CuO on TZ played an important role in NO+CO reaction besides the highly dispersed Cu species, and crystalline ZrTiO4 enhanced the activities of catalysts. NO-TPD analysis inferred that the high temperature adsorption site was probably Cu2+ and low temperature adsorption site was Cu0.展开更多
The research investigated the effect of doping two metals separately or together into Ce0.5Zr0.5O2 on the catalytic activity of MnOx/Ce0.5-xZr0.5-xM0.2xOy/Al2O3 （M=Y, Mn, Y and Mn） for catalytic combustion of benzen...The research investigated the effect of doping two metals separately or together into Ce0.5Zr0.5O2 on the catalytic activity of MnOx/Ce0.5-xZr0.5-xM0.2xOy/Al2O3 （M=Y, Mn, Y and Mn） for catalytic combustion of benzene. The prepared catalysts were characterized by X-ray diffraction （XRD）, surface area analysis, oxygen storage capacity （OSC）, and H2-temperature programmed reduction （H2-TPR）. Catalytic test was performed on a conventional fixed bed flow reactor. The characterization results revealed that Y and Mn ions entered into the ceria-zirconia mixed oxides framework, which improved the textural properties and greatly promoted the MnOx dispersion on the support surface. The complete conversion temperature of benzene on MnOx/Ce0.4Zr0.4Y0.1Mn0.1Oy/Al2O3 was 563 K, and the selectivity of carbon dioxides was 99%. This catalyst could be applied in a wide range of GHSV and wide concentration condition, showing great potential for application.展开更多
A series of nanometer oxide catalytic materials AMyAl12-yO19-δwere prepared by roasting solid oxides from the decomposition of nitrates.Its crystal structure and properties were characterized by XRD,BET,TEM technique...A series of nanometer oxide catalytic materials AMyAl12-yO19-δwere prepared by roasting solid oxides from the decomposition of nitrates.Its crystal structure and properties were characterized by XRD,BET,TEM techniques,and the catalytic activities for CO2 reforming of methane to synthetic gas was also investigated.Experimental results showed that AMyAl12-yO19-δ exhibited similar crystal structures and different properties due to the difference of the substituted metals A and M.Under the same reaction condition,compound oxides AMyAl12-yO19-δexhibited significant catalytic activities and stability for CO2 reforming of methane.During 18h reaction at 700℃,the conversions of CH4 and CO2 remained over 93.4%and 91.2%,respectively and the amount of carbon deposited was only 1.57%.展开更多
文摘Using Ti0.5Zr0.5O2(TZ) as carrier, the CuO/TZ catalysts were prepared by impregnation method with Cu(NO3)2 as active component, their activities were investigated by using a microreactor-GC NO+CO reaction system, TPR, TG-DTA, XRD and NO-TPD. Experimental results showed that the fine crystallite of CuO on TZ played an important role in NO+CO reaction besides the highly dispersed Cu species, and crystalline ZrTiO4 enhanced the activities of catalysts. NO-TPD analysis inferred that the high temperature adsorption site was probably Cu2+ and low temperature adsorption site was Cu0.
基金supported by the National Natural Science Foundation of China (20773090)the National Natural Science Key Foundation of China (2033030)
文摘The research investigated the effect of doping two metals separately or together into Ce0.5Zr0.5O2 on the catalytic activity of MnOx/Ce0.5-xZr0.5-xM0.2xOy/Al2O3 （M=Y, Mn, Y and Mn） for catalytic combustion of benzene. The prepared catalysts were characterized by X-ray diffraction （XRD）, surface area analysis, oxygen storage capacity （OSC）, and H2-temperature programmed reduction （H2-TPR）. Catalytic test was performed on a conventional fixed bed flow reactor. The characterization results revealed that Y and Mn ions entered into the ceria-zirconia mixed oxides framework, which improved the textural properties and greatly promoted the MnOx dispersion on the support surface. The complete conversion temperature of benzene on MnOx/Ce0.4Zr0.4Y0.1Mn0.1Oy/Al2O3 was 563 K, and the selectivity of carbon dioxides was 99%. This catalyst could be applied in a wide range of GHSV and wide concentration condition, showing great potential for application.
文摘A series of nanometer oxide catalytic materials AMyAl12-yO19-δwere prepared by roasting solid oxides from the decomposition of nitrates.Its crystal structure and properties were characterized by XRD,BET,TEM techniques,and the catalytic activities for CO2 reforming of methane to synthetic gas was also investigated.Experimental results showed that AMyAl12-yO19-δ exhibited similar crystal structures and different properties due to the difference of the substituted metals A and M.Under the same reaction condition,compound oxides AMyAl12-yO19-δexhibited significant catalytic activities and stability for CO2 reforming of methane.During 18h reaction at 700℃,the conversions of CH4 and CO2 remained over 93.4%and 91.2%,respectively and the amount of carbon deposited was only 1.57%.
