Fe modified and un-modified K/Mo2C were prepared and investigated as catalysts for CO hydrogenation reaction. Compared with K/Mo2C catalyst, the addition of Fe increased the production of alcohols, especially the C2＋...Fe modified and un-modified K/Mo2C were prepared and investigated as catalysts for CO hydrogenation reaction. Compared with K/Mo2C catalyst, the addition of Fe increased the production of alcohols, especially the C2＋OH. Meanwhile, considerable amounts of C5＋ hydrocar- bons and C2= -C4= were formed, whereas methane selectivity greatly decreased. Also, the activity and selectivity of the catalyst were readily affected by the reaction pressure and temperature employed. According to the XPS results, Mo4＋ might be responsible for the production of alcohols, whereas the low valence state of Mo species such as Mo^0 and/or Mo^2＋ might be account for the high activity and selectivity toward hydrocarbons.展开更多
A vacuum heating operation at 623 K on the surfaces of SiO_2-supported promoted ca- talysts makes it possible to reveal the electron transfer from Co and Fe additives to Rh atoms: a Rh catalyst containing 1 % Eh under...A vacuum heating operation at 623 K on the surfaces of SiO_2-supported promoted ca- talysts makes it possible to reveal the electron transfer from Co and Fe additives to Rh atoms: a Rh catalyst containing 1 % Eh under CO exhibits geminal CO IR bands only, while the presence of Co and Fe in promoted Rh catalysts results in linear and bridged CO chemisorp- tions on Rh in connection with their promotion in the selective hydroformylation of propy- lene.展开更多
Iron plays a crucial role in improving the oxygen evolution reaction(OER)activity of hydroxide materials.Increasing the number of iron active sites at the solid–liquid interface is beneficial to enhancing the OER per...Iron plays a crucial role in improving the oxygen evolution reaction(OER)activity of hydroxide materials.Increasing the number of iron active sites at the solid–liquid interface is beneficial to enhancing the OER performance of catalysts but still challenging.Here,by systematic exploring the activity trends of M(OH)_(x)and Cu-M(OH)_(x)(M=Mn,Cu,Ni,Fe,and Co),we discover that the Cu doping can promote the deposition of Fe active sites on metal hydroxide and Cu-Co(OH)2 shows the most favorable iron adsorption capacity.When loaded on a conductive substrate(cobalt foam(CF),the M-Cu-Co(OH)2/CF(Co(OH)_(2))prepared by molten salt method)exhibits an attractive low overpotential of 337 mV at 1,000 mA·cm^(−2).Using in anion exchange membrane(AEM)water electrolyzer,the single cell with M-Cu-Co(OH)_(2)/CF as anode catalyst performs a stable cell voltage of 2.02 V to reach 1,000 mA·cm^(−2)over 24 h,indicating a great application potential for actual electrolytic water.Therefore,the promoted adsorption of copper on iron provides a new perspective for further enhancing the OER activity of other metal hydroxides.展开更多
基金supported by the Key Project of Chinese National Programs for Fundamental Research and Development(973 Program-2005CB221400)
文摘Fe modified and un-modified K/Mo2C were prepared and investigated as catalysts for CO hydrogenation reaction. Compared with K/Mo2C catalyst, the addition of Fe increased the production of alcohols, especially the C2＋OH. Meanwhile, considerable amounts of C5＋ hydrocar- bons and C2= -C4= were formed, whereas methane selectivity greatly decreased. Also, the activity and selectivity of the catalyst were readily affected by the reaction pressure and temperature employed. According to the XPS results, Mo4＋ might be responsible for the production of alcohols, whereas the low valence state of Mo species such as Mo^0 and/or Mo^2＋ might be account for the high activity and selectivity toward hydrocarbons.
文摘A vacuum heating operation at 623 K on the surfaces of SiO_2-supported promoted ca- talysts makes it possible to reveal the electron transfer from Co and Fe additives to Rh atoms: a Rh catalyst containing 1 % Eh under CO exhibits geminal CO IR bands only, while the presence of Co and Fe in promoted Rh catalysts results in linear and bridged CO chemisorp- tions on Rh in connection with their promotion in the selective hydroformylation of propy- lene.
基金supported by the National Natural Science Foundation of China(No.52174283)Innovation Fund Project for Graduate Student of China University of Petroleum(East China)(No.22CX04026A)the Fundamental Research Funds for the Central Universities.
文摘Iron plays a crucial role in improving the oxygen evolution reaction(OER)activity of hydroxide materials.Increasing the number of iron active sites at the solid–liquid interface is beneficial to enhancing the OER performance of catalysts but still challenging.Here,by systematic exploring the activity trends of M(OH)_(x)and Cu-M(OH)_(x)(M=Mn,Cu,Ni,Fe,and Co),we discover that the Cu doping can promote the deposition of Fe active sites on metal hydroxide and Cu-Co(OH)2 shows the most favorable iron adsorption capacity.When loaded on a conductive substrate(cobalt foam(CF),the M-Cu-Co(OH)2/CF(Co(OH)_(2))prepared by molten salt method)exhibits an attractive low overpotential of 337 mV at 1,000 mA·cm^(−2).Using in anion exchange membrane(AEM)water electrolyzer,the single cell with M-Cu-Co(OH)_(2)/CF as anode catalyst performs a stable cell voltage of 2.02 V to reach 1,000 mA·cm^(−2)over 24 h,indicating a great application potential for actual electrolytic water.Therefore,the promoted adsorption of copper on iron provides a new perspective for further enhancing the OER activity of other metal hydroxides.
