Featuring an assembly of identical pores,through-pore anodic alumina(AAO) makes an ideal monolith-like catalyst support for volatile organic compound(VOC) combustion.This work employs the oxidation of toluene as a mod...Featuring an assembly of identical pores,through-pore anodic alumina(AAO) makes an ideal monolith-like catalyst support for volatile organic compound(VOC) combustion.This work employs the oxidation of toluene as a model reaction to investigate the applicability of AAO supported Pt catalysts in VOC catalytic combustion.In order to modify the microstructure of AAO.some AAO samples were exposed to hot water treatment(HWT) firstly.Results show that the optimum HWT time is 18 h.Pt/HWT18 gives a toluene conversion of95%at 200 ℃,which is comparable to the initial activity of commercial γ-Al_2O_3 particle supported Pt catalyst.Considering its confinement effect for the supported metal and its monolith-like compact unit,AAO support offers potential applications in VOC catalytic combustion.展开更多
A series of sulfided PtMo/ γ Al 2O 3 catalysts[ w (Mo)=9.0%] with different contents of Pt were characterized by using low temperature FTIR spectroscopy of adsorbed CO, while their HDS activity was investigated with ...A series of sulfided PtMo/ γ Al 2O 3 catalysts[ w (Mo)=9.0%] with different contents of Pt were characterized by using low temperature FTIR spectroscopy of adsorbed CO, while their HDS activity was investigated with thiophene as a model substrate. Experimentally, it was found that no existence of the bands related to the surface complexes of Al 3+ ←CO and Pt 0←CO→Pt 0 was observed at 77 K and that the rate of the thiophene HDS reaction(573 K) is well linearly proportional to the area of the Pt 0←CO band at 2 093 cm -1 with a higher extrapolated HDS rate compared to that of sulfided Mo/ γ Al 2O 3 catalyst at the zero content of platinum. On the basis of the results here, the conclusion may be made that the active monolayer phase of Pt Mo S may be formed over sulfided PtMo/ γ Al 2O 3 catalysts during the sulfidation process and that both Mo 2+ and Pt 0 sites for CO adsorption should be the active reaction centers of thiophene HDS.展开更多
采用常压微反、程序升温还原(TPR)、程序升温硫化(TPS)及原位红外光谱(IR)等技术,对Co Mo Al2O3催化剂的表征研究发现:在Co Mo Al2O3催化剂中不仅存在着Co、Mo中心,而且存在由Co、Mo相互作用产生的中心,Co Mo Al2O3催化剂的催化性能是...采用常压微反、程序升温还原(TPR)、程序升温硫化(TPS)及原位红外光谱(IR)等技术,对Co Mo Al2O3催化剂的表征研究发现:在Co Mo Al2O3催化剂中不仅存在着Co、Mo中心,而且存在由Co、Mo相互作用产生的中心,Co Mo Al2O3催化剂的催化性能是由Co、Mo中心和Co、Mo相互作用产生的中心共同作用的结果。展开更多
基金Supported by the National Natural Science Foundation of China(21106189,21036009)the Natural Science Foundation(S2011040001767)the Foundation from the Educational Commission(LYM11004)of Guangdong Province
文摘Featuring an assembly of identical pores,through-pore anodic alumina(AAO) makes an ideal monolith-like catalyst support for volatile organic compound(VOC) combustion.This work employs the oxidation of toluene as a model reaction to investigate the applicability of AAO supported Pt catalysts in VOC catalytic combustion.In order to modify the microstructure of AAO.some AAO samples were exposed to hot water treatment(HWT) firstly.Results show that the optimum HWT time is 18 h.Pt/HWT18 gives a toluene conversion of95%at 200 ℃,which is comparable to the initial activity of commercial γ-Al_2O_3 particle supported Pt catalyst.Considering its confinement effect for the supported metal and its monolith-like compact unit,AAO support offers potential applications in VOC catalytic combustion.
文摘A series of sulfided PtMo/ γ Al 2O 3 catalysts[ w (Mo)=9.0%] with different contents of Pt were characterized by using low temperature FTIR spectroscopy of adsorbed CO, while their HDS activity was investigated with thiophene as a model substrate. Experimentally, it was found that no existence of the bands related to the surface complexes of Al 3+ ←CO and Pt 0←CO→Pt 0 was observed at 77 K and that the rate of the thiophene HDS reaction(573 K) is well linearly proportional to the area of the Pt 0←CO band at 2 093 cm -1 with a higher extrapolated HDS rate compared to that of sulfided Mo/ γ Al 2O 3 catalyst at the zero content of platinum. On the basis of the results here, the conclusion may be made that the active monolayer phase of Pt Mo S may be formed over sulfided PtMo/ γ Al 2O 3 catalysts during the sulfidation process and that both Mo 2+ and Pt 0 sites for CO adsorption should be the active reaction centers of thiophene HDS.
文摘采用常压微反、程序升温还原(TPR)、程序升温硫化(TPS)及原位红外光谱(IR)等技术,对Co Mo Al2O3催化剂的表征研究发现:在Co Mo Al2O3催化剂中不仅存在着Co、Mo中心,而且存在由Co、Mo相互作用产生的中心,Co Mo Al2O3催化剂的催化性能是由Co、Mo中心和Co、Mo相互作用产生的中心共同作用的结果。
