A series of Cu-Mg-Al hydrotalcites derived oxides with a(Cu+Mg)/Al mole ratio of 3 and varied Cu/Mg mole ratio(from 0.07 to 0.30) were prepared by co-precipitation and calcination methods, then they were introduced to...A series of Cu-Mg-Al hydrotalcites derived oxides with a(Cu+Mg)/Al mole ratio of 3 and varied Cu/Mg mole ratio(from 0.07 to 0.30) were prepared by co-precipitation and calcination methods, then they were introduced to the hydrogenation of furfural in aqueous-phase. Effects of Cu/Mg mole ratio, reaction temperature, initial hydrogen pressure, reaction time and catalyst amount on the conversion rate of furfural as well as the selectivity toward desired product cyclopentanol were systematically investigated. The conversion of furfural over calcined hydrotalcite catalyst with a Cu/Mg mole ratio of 0.2 was up to 98.5% when the reaction was carried out under 140 ?C and the initial hydrogen pressure of 4 MPa for 10 h, while the selectivity toward cyclopentanol was up to 94.8%. The catalysts were characterized by XRD and SEM. XRD diffraction of all the samples showed characteristic pattern of hydrotalcite with varied peak intensity as a result of different Cu content. The catalytic activity was improved gradually with the increase of Cu component in the hydrotalcite.展开更多
The synthesis and characterization, by elementary analysis, IR and 1H NMR of ( Z ) 1 [2 (triphenylstannyl)vinyl] 1 cyclopentanol, CH 2(CH) 3C(OH)CHCHSnPh 3 are described together with its halodemetalla...The synthesis and characterization, by elementary analysis, IR and 1H NMR of ( Z ) 1 [2 (triphenylstannyl)vinyl] 1 cyclopentanol, CH 2(CH) 3C(OH)CHCHSnPh 3 are described together with its halodemetallation by I 2, Br 2 and ICl to yield derivatives of the types CH 2(CH 2) 3C(OH)CHCHSnPh 3- n X n (n =1, 2; X=I, Br, Cl). The solid state structures of the dibromide were determined by X ray diffraction analysis. In the crystal of CH 2(CH 2) 3C(OH)· CHCHSnBr 2 , the Sn atom has a destorted trigonal bipyramidal geometry, in which Sn—O interaction is noted[0 244 6(8) nm]. The biological activity of the title complexes was also investigated.展开更多
A series of cobalt catalysts with different supports were prepared for the selective conversion of biomassderived furfural to cyclopentanol（CPL） in one step.The best CPLyield was 82 mol%at 160 ℃,2 MPa H2,4 h when c...A series of cobalt catalysts with different supports were prepared for the selective conversion of biomassderived furfural to cyclopentanol（CPL） in one step.The best CPLyield was 82 mol%at 160 ℃,2 MPa H2,4 h when cobalt was supported on ZrO2-La2O3.The supports were characterized by X-ray diffraction（XRD）and temperature-programmed desorption of ammonia（NH3-TPD）.The XRD results indicated that the more stable t-ZrO2 formed by doping La2O3.The amount of acid sites of the catalyst increased,too.The influences of parameters such as reaction temperature,hydrogen pressure,and reaction time on the catalytic activity were also investigated.The polymer formed during the reaction may cause the deactivation of the Co/ZrO2-La2O3 catalyst.This work provides a possibility to prepare the stable t-ZrO2and apply with cobalt metal for biomass valorization.展开更多
基金supported by the National Hi-tech Research and Development Program of China(863 Program)(2012AA051801)the Fundamenta lResearch Funds for the Central Universities(No.CXZZ13 0112)
文摘A series of Cu-Mg-Al hydrotalcites derived oxides with a(Cu+Mg)/Al mole ratio of 3 and varied Cu/Mg mole ratio(from 0.07 to 0.30) were prepared by co-precipitation and calcination methods, then they were introduced to the hydrogenation of furfural in aqueous-phase. Effects of Cu/Mg mole ratio, reaction temperature, initial hydrogen pressure, reaction time and catalyst amount on the conversion rate of furfural as well as the selectivity toward desired product cyclopentanol were systematically investigated. The conversion of furfural over calcined hydrotalcite catalyst with a Cu/Mg mole ratio of 0.2 was up to 98.5% when the reaction was carried out under 140 ?C and the initial hydrogen pressure of 4 MPa for 10 h, while the selectivity toward cyclopentanol was up to 94.8%. The catalysts were characterized by XRD and SEM. XRD diffraction of all the samples showed characteristic pattern of hydrotalcite with varied peak intensity as a result of different Cu content. The catalytic activity was improved gradually with the increase of Cu component in the hydrotalcite.
文摘The synthesis and characterization, by elementary analysis, IR and 1H NMR of ( Z ) 1 [2 (triphenylstannyl)vinyl] 1 cyclopentanol, CH 2(CH) 3C(OH)CHCHSnPh 3 are described together with its halodemetallation by I 2, Br 2 and ICl to yield derivatives of the types CH 2(CH 2) 3C(OH)CHCHSnPh 3- n X n (n =1, 2; X=I, Br, Cl). The solid state structures of the dibromide were determined by X ray diffraction analysis. In the crystal of CH 2(CH 2) 3C(OH)· CHCHSnBr 2 , the Sn atom has a destorted trigonal bipyramidal geometry, in which Sn—O interaction is noted[0 244 6(8) nm]. The biological activity of the title complexes was also investigated.
基金financial support from the NSFC(No.21572213)the National Basic Research Program of China(No.2013CB228103)+1 种基金Program for Changjiang Scholars and Innovative Research Team in University of the Ministry of Education of Chinathe Fundamental Research Funds for the Central Universities(No.wk 2060190040)
文摘A series of cobalt catalysts with different supports were prepared for the selective conversion of biomassderived furfural to cyclopentanol（CPL） in one step.The best CPLyield was 82 mol%at 160 ℃,2 MPa H2,4 h when cobalt was supported on ZrO2-La2O3.The supports were characterized by X-ray diffraction（XRD）and temperature-programmed desorption of ammonia（NH3-TPD）.The XRD results indicated that the more stable t-ZrO2 formed by doping La2O3.The amount of acid sites of the catalyst increased,too.The influences of parameters such as reaction temperature,hydrogen pressure,and reaction time on the catalytic activity were also investigated.The polymer formed during the reaction may cause the deactivation of the Co/ZrO2-La2O3 catalyst.This work provides a possibility to prepare the stable t-ZrO2and apply with cobalt metal for biomass valorization.
