Rh(Ⅲ) and Ir(Ⅲ) were separated satisfactorily in Tween80 (NH 4) 2SO 4 H 2O system by the liquid solid extraction in form of complexes with stannous chloride.
Various biologically important perimidine derivatives have been synthesized efficiently from various ketones and naphthalene- 1,8-diamine by using a catalytic amount of RuCl_3(1 mol%).This method is a very simple and ...Various biologically important perimidine derivatives have been synthesized efficiently from various ketones and naphthalene- 1,8-diamine by using a catalytic amount of RuCl_3(1 mol%).This method is a very simple and high yielding reaction for the synthesis of perimidine derivatives.展开更多
Developing an environmental-friendly and highly active catalyst in transesterification for biodiesel production is of great importance for a more economic biodisel process.Herein,we reported that waste eggshells were ...Developing an environmental-friendly and highly active catalyst in transesterification for biodiesel production is of great importance for a more economic biodisel process.Herein,we reported that waste eggshells were used to adsorb Au(Ⅲ) in water and convert the Au(Ⅲ)-polluted eggshells into the functional nanocatalyst-Ca O/Au for the transesterification reaction between soybean oil and methanol to the preparation of biodiesel.By coupling of Ca O and Au nanoparticles,Ca O/Au nanoparticles showed superior catalytic activity for the transesterification reaction between soybean oil and methanol.An optimum performance was observed over Ca O/Au nanocomposites in a methanol-oil molar ratio at 12:1with catalyst content of 1.0 wt% at 70°C for 3 h.Besides,the catalytic activity of Ca O/Au nanocatalyst was almost unchanged after recycling for 5 times and the yield of biodiesel still kept at 88.9%.The proof-of concept study provided us a sustainable method for utilization of waste eggshells to remedy the metal ions-polluted wastewater and the synthesis of functional nanocomposite for biodiesel production,show great potential application of waste eggshell in adsorption and catalytic reactions.展开更多
Al2O3 and Ce-Zr mixed oxides are important components of the automobile three-way catalyst.Various contents modifying A12O3(GAL) was physically introduced into Ce-Zr-Al mixed oxides(CZA) to form series of GAL/CZA comp...Al2O3 and Ce-Zr mixed oxides are important components of the automobile three-way catalyst.Various contents modifying A12O3(GAL) was physically introduced into Ce-Zr-Al mixed oxides(CZA) to form series of GAL/CZA composition.The Pd/Rh catalyst samples were prepared by different GAL/CZA support loading Pd/Rh,then aged at 950 oC for 6 h.The catalytic behavior of different Pd/Rh catalyst samples was studied.Surface area,oxygen storage capacity(OSC) and H2 adsorption capacity(TPR) of fresh and aged samples were...展开更多
Partial oxidation of methane to syngas （POM） over Rh/SiO2 catalyst was investigated using in-situ FT-IR. When methane interacted with 1.0wt%Rh/SiO2 catalyst, it was dissociated to adsorbed hydrogen and CHx species. ...Partial oxidation of methane to syngas （POM） over Rh/SiO2 catalyst was investigated using in-situ FT-IR. When methane interacted with 1.0wt%Rh/SiO2 catalyst, it was dissociated to adsorbed hydrogen and CHx species. The adsorbed hydrogen atoms were transferred to SiO2 surface by ＂spill-over＂ and reacted with lattice oxygen to form surface -OH species. POM mechanism was investigated over Rh/SiO2 catalyst using in-situ FT-IR. It was found that CO2 was formed before CO could be detected when CH4 and O2 were introduced over the preoxidized Rh/SiO2 catalyst, whereas CO was detected before CO2 was formed over the prereduced Rh/SiO2 catalyst.展开更多
An efficient and simple method for the preparation of 5-arylamino-1H-tetrazole and 1-aryl-5-amino-1H-tetrazole derivatives is reported using aluminum（Ⅲ） hydrogensulfate（Al（HSO4）3） as an effective heterogeneous ...An efficient and simple method for the preparation of 5-arylamino-1H-tetrazole and 1-aryl-5-amino-1H-tetrazole derivatives is reported using aluminum（Ⅲ） hydrogensulfate（Al（HSO4）3） as an effective heterogeneous catalyst from secondary arylcyanamides. Generally,when the substitution in arylcyanamide is strongly electron-withdrawing the position of equilibrium would shift toward the isomer of 1-aryl-5-amino-1H-tetrazole（B） and as the electron-donating of substituent increased,the position of equilibrium is shifted toward the isomer of 5-arylamino-1H-tetrazole（A）.The present methodology offers several advantages,such as excellent yields,short reaction times,easy work-up and greener conditions.展开更多
The kinetics of CO hydrogenation for the synthesis of C_2 oxygenates overRh-Mn-Li-Fe/SiO_2 was investigated. Kinetic parameters for the formation of ethanol, acetaldehyde,C'2 oxygenates, methanol and methane were ...The kinetics of CO hydrogenation for the synthesis of C_2 oxygenates overRh-Mn-Li-Fe/SiO_2 was investigated. Kinetic parameters for the formation of ethanol, acetaldehyde,C'2 oxygenates, methanol and methane were obtained. The activation energy. H_2 and CO dependenceorders for ethanol and acetaldehyde formation differed greatly, the large difference seemed to implythat they were formed through different intermediates.展开更多
The catalysts with Rh loading on different cerium-zirconium mixed oxides were characterized by BET, H2-TPR and OSC. The effects of different cerium-zirconium mixed oxides on catalytic performance and thermal stability...The catalysts with Rh loading on different cerium-zirconium mixed oxides were characterized by BET, H2-TPR and OSC. The effects of different cerium-zirconium mixed oxides on catalytic performance and thermal stability of Rh loaded catalyst were studied. The results show that: (1) Rh can enhance cerium-zirconium mixed oxides OSC and catalytic reaction rates; (2) cerium-zirconium mixed oxides with high Ce contents and low Zr contents are more favorable to the stability of catalysts. Moreover, the contents of CeO2 have important effect on catalysts characteristics, and the addition of some rare earth components, such as La, Pr and Nd also have some influences.展开更多
EHMO calculations and orbital analysis of fragments were performed for the Synthetic reactions of oxygenates in Fischer-Tropsch synthesis using a butterfly model for four different metals (Nim Ru, Rh, Pd)supported on ...EHMO calculations and orbital analysis of fragments were performed for the Synthetic reactions of oxygenates in Fischer-Tropsch synthesis using a butterfly model for four different metals (Nim Ru, Rh, Pd)supported on SiO2 as catalysts. Four processest CO dissociation, coupling of CO and H to produce CHO.insertion of CO to M-CH3; insertion of CH2 to M-CH3 have been calculated. We compared the degree of CO bond activation and the banters of the foregoing processes for these four catalysts, it can be shown that Ni/SiO2 is a methanation catalyst, Ru/SiO2 and Rh/SiO2 can produce C2-oxygenated compound (acetaldehyde), especially Rh/SiO2 is a good catalyst for producing it, and Pd/SiO2 is a methanol Synthesis catalyst.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
文摘Rh(Ⅲ) and Ir(Ⅲ) were separated satisfactorily in Tween80 (NH 4) 2SO 4 H 2O system by the liquid solid extraction in form of complexes with stannous chloride.
文摘Various biologically important perimidine derivatives have been synthesized efficiently from various ketones and naphthalene- 1,8-diamine by using a catalytic amount of RuCl_3(1 mol%).This method is a very simple and high yielding reaction for the synthesis of perimidine derivatives.
基金supported by the Orientative project funded by Fujian Provincial Science and Technology Department(2019H0023)Quanzhou City Science & Technology Program of China(2017G023)+1 种基金Fujian Educational Committee(JAT160402)Natural Science Foundation of Shandong Province,China(No.ZR2019MEM012)。
文摘Developing an environmental-friendly and highly active catalyst in transesterification for biodiesel production is of great importance for a more economic biodisel process.Herein,we reported that waste eggshells were used to adsorb Au(Ⅲ) in water and convert the Au(Ⅲ)-polluted eggshells into the functional nanocatalyst-Ca O/Au for the transesterification reaction between soybean oil and methanol to the preparation of biodiesel.By coupling of Ca O and Au nanoparticles,Ca O/Au nanoparticles showed superior catalytic activity for the transesterification reaction between soybean oil and methanol.An optimum performance was observed over Ca O/Au nanocomposites in a methanol-oil molar ratio at 12:1with catalyst content of 1.0 wt% at 70°C for 3 h.Besides,the catalytic activity of Ca O/Au nanocatalyst was almost unchanged after recycling for 5 times and the yield of biodiesel still kept at 88.9%.The proof-of concept study provided us a sustainable method for utilization of waste eggshells to remedy the metal ions-polluted wastewater and the synthesis of functional nanocomposite for biodiesel production,show great potential application of waste eggshell in adsorption and catalytic reactions.
基金supported by the National High Technology Research and Development Program (863) of China (2006AA03Z462)
文摘Al2O3 and Ce-Zr mixed oxides are important components of the automobile three-way catalyst.Various contents modifying A12O3(GAL) was physically introduced into Ce-Zr-Al mixed oxides(CZA) to form series of GAL/CZA composition.The Pd/Rh catalyst samples were prepared by different GAL/CZA support loading Pd/Rh,then aged at 950 oC for 6 h.The catalytic behavior of different Pd/Rh catalyst samples was studied.Surface area,oxygen storage capacity(OSC) and H2 adsorption capacity(TPR) of fresh and aged samples were...
基金This study was supported by the grant of 2004C31053 from the Ministry of Science and Technology of Zhejiang Province, China, and the grant of Y404305 from the Natural Science Foundation of Zhejiang Province, Chinathe grant of 20673101, 20673102 from National Natural Science Foundation of China.
文摘Partial oxidation of methane to syngas （POM） over Rh/SiO2 catalyst was investigated using in-situ FT-IR. When methane interacted with 1.0wt%Rh/SiO2 catalyst, it was dissociated to adsorbed hydrogen and CHx species. The adsorbed hydrogen atoms were transferred to SiO2 surface by ＂spill-over＂ and reacted with lattice oxygen to form surface -OH species. POM mechanism was investigated over Rh/SiO2 catalyst using in-situ FT-IR. It was found that CO2 was formed before CO could be detected when CH4 and O2 were introduced over the preoxidized Rh/SiO2 catalyst, whereas CO was detected before CO2 was formed over the prereduced Rh/SiO2 catalyst.
文摘An efficient and simple method for the preparation of 5-arylamino-1H-tetrazole and 1-aryl-5-amino-1H-tetrazole derivatives is reported using aluminum（Ⅲ） hydrogensulfate（Al（HSO4）3） as an effective heterogeneous catalyst from secondary arylcyanamides. Generally,when the substitution in arylcyanamide is strongly electron-withdrawing the position of equilibrium would shift toward the isomer of 1-aryl-5-amino-1H-tetrazole（B） and as the electron-donating of substituent increased,the position of equilibrium is shifted toward the isomer of 5-arylamino-1H-tetrazole（A）.The present methodology offers several advantages,such as excellent yields,short reaction times,easy work-up and greener conditions.
基金supported by Shanghai Municipal Natural Science Foundation,China(15ZR1447800)the Chinese Postdoctoral Science Foundation(2012M511158,2013T60477,2014M560363)~~
基金This work was financially by the Chinese Science and Technology Ministry (Grant No.G1999022404)
文摘The kinetics of CO hydrogenation for the synthesis of C_2 oxygenates overRh-Mn-Li-Fe/SiO_2 was investigated. Kinetic parameters for the formation of ethanol, acetaldehyde,C'2 oxygenates, methanol and methane were obtained. The activation energy. H_2 and CO dependenceorders for ethanol and acetaldehyde formation differed greatly, the large difference seemed to implythat they were formed through different intermediates.
基金Project supported by Yunnan Province Science Technology Program (2002C001Z) the National High Technology Research and Development Program ( 863 ) of China ( 2002AA321060 ) Yunnan Province Science Technology Program (2004B0028Q)
文摘The catalysts with Rh loading on different cerium-zirconium mixed oxides were characterized by BET, H2-TPR and OSC. The effects of different cerium-zirconium mixed oxides on catalytic performance and thermal stability of Rh loaded catalyst were studied. The results show that: (1) Rh can enhance cerium-zirconium mixed oxides OSC and catalytic reaction rates; (2) cerium-zirconium mixed oxides with high Ce contents and low Zr contents are more favorable to the stability of catalysts. Moreover, the contents of CeO2 have important effect on catalysts characteristics, and the addition of some rare earth components, such as La, Pr and Nd also have some influences.
文摘EHMO calculations and orbital analysis of fragments were performed for the Synthetic reactions of oxygenates in Fischer-Tropsch synthesis using a butterfly model for four different metals (Nim Ru, Rh, Pd)supported on SiO2 as catalysts. Four processest CO dissociation, coupling of CO and H to produce CHO.insertion of CO to M-CH3; insertion of CH2 to M-CH3 have been calculated. We compared the degree of CO bond activation and the banters of the foregoing processes for these four catalysts, it can be shown that Ni/SiO2 is a methanation catalyst, Ru/SiO2 and Rh/SiO2 can produce C2-oxygenated compound (acetaldehyde), especially Rh/SiO2 is a good catalyst for producing it, and Pd/SiO2 is a methanol Synthesis catalyst.
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.
