查看更多>>摘要：The catalytic performance of synergistic catalytic elimination of NO,mercury and chlorobenzene for WCeMnOx/TiO2-ZrO2 was improved by controlling the pore structure.The formation of micron-sized macropores made the catalyst structure looser,and the transparent macropores helped the catalyst expose more active sites.At low temperature,-NH2* reacted with monodentate nitrite and bidentate nitrate,and NHj reacted with gas phase NO to generate N2 and H2O.At high temperature,NH4 reacted rapidly with gas phase NO.The reaction process of catalytic oxidation of Hg° was that gaseous Hg° was adsorbed on the catalyst surface and then oxidized to Hg~(2+).For the catalytic degradation of chlorobenzene,phenols and HCl were generated firstly,and then phenols and hydroxyl groups reacted to form maleate,bidentate carbonate and carbonate species.The maleate and bidentate carbonate degraded to form carbonate,and the carbonate degraded to produce CO2 and H2O.
查看更多>>摘要：Crystal facet engineering is considered to be a powerful method to maximize the inherent catalytic properties of electrocatalysts.In this research,polyvinylpyrrolidone(PVP)served as a surfactant to realize the controllable synthesis of sub-microspheres NiCo2S4 with a highly exposed(400)crystal facet.The sub-microspheres NiCo2S4(P-0.2)shows excellent catalytic activities as a cathode toward hydrogen evolution reaction(HER)with a lower overpotential of 235 mV at 10 mA·cm~(-2)in alkaline electrolyte.Moreover,the sub-microspheres NiCo2S4 presents satisfactory durability in the alkaline solution for 24 h.Such remarkable HER performance of electrocatalyst is benefited from the unique sub-microspheres structure,which could highly expose specific crystal facets to provide abundant active sites,and thus enhance the mass/electron transfer efficiency.Furthermore,the increased exposure of(400)facet of NiCo2S4 crystal will offer more S2"during HER,it can effectively stabilize the reaction intermediates.
查看更多>>摘要：We have optimized the H2 production by methanol thermo-photocatalytic reforming in the gas phase using Cu/TiO2 catalyst by tuning metal loading.Metal co-catalyst has been deposited by means of chemical reduction deposition.We have stated that thermo-and thermo-photocatalytic process leads to a notable H2 production at 200 ℃.By in-situ FTIR studies we evidenced that formate formation follows a different evolution depending on the reforming experiment.These surface formate would lead to CO formation through dehydration reaction.At higher Cu content the low CO selectivity denote that water-gas-shift reaction would predominate and exalt H2 yield.Thus,different optimum Cu content is found for each reforming experiment.While for the photocatalytic reforming Cu/TiO2(2 wt%)is the best catalyst of the series,we should increase the Cu content to Cu/TiO2(5 wt %)to achieve the optimum performance for thermo-photocatalytic reforming of methanol.
查看更多>>摘要：Rich Cu-ZnO interfaces play a significant role in Cu/ZnO catalysts for CO2 hydrogenation to methanol.However,the low methanol selectivity and catalytic stability of reported Cu/ZnO catalysts mainly ascribe to the reduction of Cu-ZnO interfaces,which caused by the agglomeration of Cu nanoparticles.Herein,Cu/ZnO catalysts(named CuxZnO-MOF-74-350)with rich Cu-ZnO interfaces were prepared by using Cu-Zn bimetallic metal organic framework(MOFs)-templated strategy(x is the feeding ratios of Cu/Zn).Especially,CuZnO-MOF-74-350 catalyst exhibited high methanol selectivity of about 80% at a CO2 conversion of 7.5%,and had long-term durability for 100 h at 190 ℃ under 4.0 MPa.The great catalytic performance mainly resulted from rich interfaces,which were conducive to the adsorption of CO2 and the formation of intermediate.This study provides a novel strategy for optimizing the activity of catalysts in the view of the regulation of interface.
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