A series of manganese-promoted MgAlFe mixed oxides, used as sulfur transfer catalysts, were prepared by acid-processed gelatin method and characterized by TGA-DTA, XRD, N2 adsorption-desorption and FT-IR techniques. I...A series of manganese-promoted MgAlFe mixed oxides, used as sulfur transfer catalysts, were prepared by acid-processed gelatin method and characterized by TGA-DTA, XRD, N2 adsorption-desorption and FT-IR techniques. It was found that the sulfur transfer catalysts with 0.5？3.0 wt% manganese showed its good dispersion in the precursor. The novel Mn/MgAlFe catalysts with 0.5？5.0 wt% manganese oxide showed a high oxidative adsorption rate and sulfur adsorption capacity, and 5.0 wt% Mn/MgAlFe sample was superior to the others for SO2 removal. Moreover, the presence of CO had no obvious effect on the adsorption activity of sulfur transfer catalysts for SO2 uptake.展开更多
Mixed solld solutions magnesium-alumina spinel catalyst, MgAl2O4 ·xAl2O3·yMgO (0< x<9, 0< y <5), using to reduce the SOx emission from the fluid catalytic cracking units (FCCU), were prepared by ...Mixed solld solutions magnesium-alumina spinel catalyst, MgAl2O4 ·xAl2O3·yMgO (0< x<9, 0< y <5), using to reduce the SOx emission from the fluid catalytic cracking units (FCCU), were prepared by coprecipitation method. It was found that a "volcano" type curve relation between the lattice parameter (a) and the composition of the spinel existed. The activity decreases as the value of x in the alumina excess spinel increases from 1 to 9, and increases as the value of y increases in the magnesium-rich spinel until up to 1, if y >1, the activity decreases which was due to MgO and spinel coekist in the catalyst. The results of reduction-oxidation (red-ox) cycle tests showed that introducing rare earth cerium to spinel could improve the de-SOx activity. Of all the catalysts, 0.1Ce/MgAl2O4· MgO is a promising catalyst which has the highest activity.30% propane as reducing gas is superior to 30% H2.展开更多
基金supported by the Foundation of Petrochina Company Limited(NO.07-03-G6)
文摘A series of manganese-promoted MgAlFe mixed oxides, used as sulfur transfer catalysts, were prepared by acid-processed gelatin method and characterized by TGA-DTA, XRD, N2 adsorption-desorption and FT-IR techniques. It was found that the sulfur transfer catalysts with 0.5？3.0 wt% manganese showed its good dispersion in the precursor. The novel Mn/MgAlFe catalysts with 0.5？5.0 wt% manganese oxide showed a high oxidative adsorption rate and sulfur adsorption capacity, and 5.0 wt% Mn/MgAlFe sample was superior to the others for SO2 removal. Moreover, the presence of CO had no obvious effect on the adsorption activity of sulfur transfer catalysts for SO2 uptake.
文摘Mixed solld solutions magnesium-alumina spinel catalyst, MgAl2O4 ·xAl2O3·yMgO (0< x<9, 0< y <5), using to reduce the SOx emission from the fluid catalytic cracking units (FCCU), were prepared by coprecipitation method. It was found that a "volcano" type curve relation between the lattice parameter (a) and the composition of the spinel existed. The activity decreases as the value of x in the alumina excess spinel increases from 1 to 9, and increases as the value of y increases in the magnesium-rich spinel until up to 1, if y >1, the activity decreases which was due to MgO and spinel coekist in the catalyst. The results of reduction-oxidation (red-ox) cycle tests showed that introducing rare earth cerium to spinel could improve the de-SOx activity. Of all the catalysts, 0.1Ce/MgAl2O4· MgO is a promising catalyst which has the highest activity.30% propane as reducing gas is superior to 30% H2.
