Ni-based catalysts doped with copper additives were studied on their role in ethanol steam reforming reaction. The effects of Cu content, support species involving Al2O3-SIO2, Al2O3-MgO, Al2O3-ZnO, and Al2O3-La2O3, on...Ni-based catalysts doped with copper additives were studied on their role in ethanol steam reforming reaction. The effects of Cu content, support species involving Al2O3-SIO2, Al2O3-MgO, Al2O3-ZnO, and Al2O3-La2O3, on the catalytic performance were studied. Characterizations by TPR, XRD, NH3-TPD, XPS, and TGA indicated that catalysts 30Ni5Cu/Al2O3-MgO and 30Ni5Cu/Al2O3-ZnO have much higher H2 selectivity than 30Ni5Cu/Al2O3-SiO2, as well as good coke resistance. H2 selectivity for 30Ni5Cu/Al2O3-MgO catalyst was 73.3% at 450 ℃ and increased to 94.0% at 600℃, whereas for 30Ni5Cu/Al2O3-ZnO catalyst, the H2 selectivity was 63.6% at 450 ℃ and 95.2% at 600℃. TheseAl2O3-MgO and Al2O3-ZnO supported Ni-Cu bimetallic catalysts may have important applications in the production of hydrogen by ethanol steam reforming reactions.展开更多
The sulfation of CeO2/γ-Al2O3 sorbent in simulated flue gas was studied. A series of CeO2/γ-Al2O3 sorbents with different CeO2 loadings were prepared by impregnation and characterized by X-ray diffraction. Thermogra...The sulfation of CeO2/γ-Al2O3 sorbent in simulated flue gas was studied. A series of CeO2/γ-Al2O3 sorbents with different CeO2 loadings were prepared by impregnation and characterized by X-ray diffraction. Thermogravimetric technique was used to study the sulfation of CeO2/γ-Al2O3 sorbents, mainly on the CeO2 loading, sulfation cycles, and intrinsic kinetics. The study revealed that monolayer coverage of CeO2 supported on γ-Al2O3 was 0. 125 g CeO2/g （γ-Al2O3）. Below monolayer coverage, CeO2 was highly dispersed on γ-Al2O3. The optimal CeO2 loading on sulfation was 0.03 g CeO2/g （γ-Al2O3）. CeO2/γ-Al2O3 sorbent was recyclable by controlling sulfation time. Intrinsic kineticd equation was R = 1. 1394×10^-4×exp （ - 1,508.39/T） mg·mg^-1·s^-1 Activation energy and reaction order were 12.54 kJ·mol^-1 and first order, respectively.展开更多
The copper oxide bed regenerable adsorber process can efficiently remove sulfur dioxide (SO2) and sulfur trioxide (SO3) and reduce nitrogen oxides (NOX) from flue gas with no solid or liquid byproducts. This paper inv...The copper oxide bed regenerable adsorber process can efficiently remove sulfur dioxide (SO2) and sulfur trioxide (SO3) and reduce nitrogen oxides (NOX) from flue gas with no solid or liquid byproducts. This paper investigates the dry flue gas desulfu- rization activities of the CuO/γ-Al2O3 under different operation conditions finding that the dispersion degree of copper oxide can achieve a threshold value, which is 0.47 mg/m2 carriers. The conclusion confirms that the sulfur capacity of desulfurizer is asso- ciated with flue gas’ space velocity, reaction temperature, copper content and the struc- ture of sorbent pellet, etc. And with the condition of the desulfurization reaction tem- perature 673 K, the space velocity 11 200 h-1 and the S/Cu mole ratio under 1, the sulfur removal efficiency can go upwards to 95%.展开更多
基金973 Program (2006CB202500)the National Natural Science Foundation of China (20676096)New Century Excellent Talents in University.9gram (2006CB202500)
文摘Ni-based catalysts doped with copper additives were studied on their role in ethanol steam reforming reaction. The effects of Cu content, support species involving Al2O3-SIO2, Al2O3-MgO, Al2O3-ZnO, and Al2O3-La2O3, on the catalytic performance were studied. Characterizations by TPR, XRD, NH3-TPD, XPS, and TGA indicated that catalysts 30Ni5Cu/Al2O3-MgO and 30Ni5Cu/Al2O3-ZnO have much higher H2 selectivity than 30Ni5Cu/Al2O3-SiO2, as well as good coke resistance. H2 selectivity for 30Ni5Cu/Al2O3-MgO catalyst was 73.3% at 450 ℃ and increased to 94.0% at 600℃, whereas for 30Ni5Cu/Al2O3-ZnO catalyst, the H2 selectivity was 63.6% at 450 ℃ and 95.2% at 600℃. TheseAl2O3-MgO and Al2O3-ZnO supported Ni-Cu bimetallic catalysts may have important applications in the production of hydrogen by ethanol steam reforming reactions.
基金Project supported bythe National Natural Science Foundation of China (90210003) Natural Science Foundation of Bei-jing City (2012010)
文摘The sulfation of CeO2/γ-Al2O3 sorbent in simulated flue gas was studied. A series of CeO2/γ-Al2O3 sorbents with different CeO2 loadings were prepared by impregnation and characterized by X-ray diffraction. Thermogravimetric technique was used to study the sulfation of CeO2/γ-Al2O3 sorbents, mainly on the CeO2 loading, sulfation cycles, and intrinsic kinetics. The study revealed that monolayer coverage of CeO2 supported on γ-Al2O3 was 0. 125 g CeO2/g （γ-Al2O3）. Below monolayer coverage, CeO2 was highly dispersed on γ-Al2O3. The optimal CeO2 loading on sulfation was 0.03 g CeO2/g （γ-Al2O3）. CeO2/γ-Al2O3 sorbent was recyclable by controlling sulfation time. Intrinsic kineticd equation was R = 1. 1394×10^-4×exp （ - 1,508.39/T） mg·mg^-1·s^-1 Activation energy and reaction order were 12.54 kJ·mol^-1 and first order, respectively.
基金Supported by the Special Fund for Major State Basic Research Project (G1999022207)
文摘The copper oxide bed regenerable adsorber process can efficiently remove sulfur dioxide (SO2) and sulfur trioxide (SO3) and reduce nitrogen oxides (NOX) from flue gas with no solid or liquid byproducts. This paper investigates the dry flue gas desulfu- rization activities of the CuO/γ-Al2O3 under different operation conditions finding that the dispersion degree of copper oxide can achieve a threshold value, which is 0.47 mg/m2 carriers. The conclusion confirms that the sulfur capacity of desulfurizer is asso- ciated with flue gas’ space velocity, reaction temperature, copper content and the struc- ture of sorbent pellet, etc. And with the condition of the desulfurization reaction tem- perature 673 K, the space velocity 11 200 h-1 and the S/Cu mole ratio under 1, the sulfur removal efficiency can go upwards to 95%.
