To develop proton-conducting materials with high hydrothermal and acid-base stability and to elucidate the proton-transport mechanism through visualized structural analysis,two new lanthanum phosphite-oxalates with 3D...To develop proton-conducting materials with high hydrothermal and acid-base stability and to elucidate the proton-transport mechanism through visualized structural analysis,two new lanthanum phosphite-oxalates with 3D frameworks,designated as[La(HPO_(3))(C_(2)O_(4))0.5(H_(2)O)_(2)](La‑1)and(C_(6)H_(16)N_(2))(H_(3)O)[La_(2)(H_(2)PO_(3))_(3)(C_(2)O_(4))_(3)(H_(2)O)](La‑2)(C_(6)H_(14)N_(2)=cis-2,6-dimethylpiperazine),were prepared by hydrothermal and solvothermal conduction,respectively.La‑1 was constructed with lanthanum phosphite 2D layers and C_(2)O_(4)^(2-)groups,whereas La‑2 was constructed with lanthanum oxalate 2D layers and H_(2)PO^(3-)groups.Alternating current(AC)impedance spectra indicate that the pro-ton conductivities of both compounds could reach 10^(-4)S·cm^(-1)and remain highly durable at 75℃and 98%of rela-tive humidity(RH).Due to the abundance of H-bonds in La‑2,theσof La‑2 was higher than that of La‑1.La‑1 exhibited excellent water and pH stability.CCDC:2439965,La‑1;443776,La‑2.展开更多
The syntheis of diphenyletylane with xylol and styrene as reactants and solid superacid SO42-/TiO2 doped rare-earth metal ion La3+ as a catalyst was reported.The results showed that the optimal conditions were using 1...The syntheis of diphenyletylane with xylol and styrene as reactants and solid superacid SO42-/TiO2 doped rare-earth metal ion La3+ as a catalyst was reported.The results showed that the optimal conditions were using 1% of catalyst with the molar ration of xylol to styrene being 7.5:1,at temperature of 140℃ for 3 h;The yield of diphenylethylane under such conditions was about 97.5%.展开更多
The LaCoO3 and 1%,10%,20%,30% doped Cu-LaCoO3 were prepared and studied. Two pretreated process were studied to investigate the effect of pretreating process of the catalysts on the reduction of SO2 by CO. One was usi...The LaCoO3 and 1%,10%,20%,30% doped Cu-LaCoO3 were prepared and studied. Two pretreated process were studied to investigate the effect of pretreating process of the catalysts on the reduction of SO2 by CO. One was using the mixture of SO2 and CO for catalysts sulfurized and poisoned in the presence of oxygen and the other was using SO2 and CO pre-reduced in the absence of oxygen. The evaluations were based on the SO2 conversion as well as sulfur selectivity and COS produced in a gradientless, quartz tubular packed-bed reactor. It was found that the catalysts sulfurized and poisoned under the mixture of SO2 and CO in the presence of oxygen could sustain its activity better than the pre-reduced catalysts. The activity decrease of the sulfurized and poisoned catalysts was very small after 4 h reaction. But for the two pre-reduced catalysts, SO2 conversion was only 17% over one 10% doped Cu-LaCoO3 and the other was deactivated after 140 min reaction. It was also found that all the doped Cu catalysts, sulfurized and poisoned in the presence of oxygen, presented higher oxygen resistance than the pre-reduced catalysts after reaction. The SO2 conversion of all the doped Cu catalysts decreased a little over 40 h reaction, while the activity of un-doped LaCoO3 was lowered to only 0.2 times of the initial activity. The other result showed that the COS formation was minimized in the doped Cu catalysts. From the results, it could be concluded that the 10% Cu-LaCoO3 was the most effective of the catalysts for removing sulfur with little COS formation.展开更多
文摘To develop proton-conducting materials with high hydrothermal and acid-base stability and to elucidate the proton-transport mechanism through visualized structural analysis,two new lanthanum phosphite-oxalates with 3D frameworks,designated as[La(HPO_(3))(C_(2)O_(4))0.5(H_(2)O)_(2)](La‑1)and(C_(6)H_(16)N_(2))(H_(3)O)[La_(2)(H_(2)PO_(3))_(3)(C_(2)O_(4))_(3)(H_(2)O)](La‑2)(C_(6)H_(14)N_(2)=cis-2,6-dimethylpiperazine),were prepared by hydrothermal and solvothermal conduction,respectively.La‑1 was constructed with lanthanum phosphite 2D layers and C_(2)O_(4)^(2-)groups,whereas La‑2 was constructed with lanthanum oxalate 2D layers and H_(2)PO^(3-)groups.Alternating current(AC)impedance spectra indicate that the pro-ton conductivities of both compounds could reach 10^(-4)S·cm^(-1)and remain highly durable at 75℃and 98%of rela-tive humidity(RH).Due to the abundance of H-bonds in La‑2,theσof La‑2 was higher than that of La‑1.La‑1 exhibited excellent water and pH stability.CCDC:2439965,La‑1;443776,La‑2.
文摘The syntheis of diphenyletylane with xylol and styrene as reactants and solid superacid SO42-/TiO2 doped rare-earth metal ion La3+ as a catalyst was reported.The results showed that the optimal conditions were using 1% of catalyst with the molar ration of xylol to styrene being 7.5:1,at temperature of 140℃ for 3 h;The yield of diphenylethylane under such conditions was about 97.5%.
文摘The LaCoO3 and 1%,10%,20%,30% doped Cu-LaCoO3 were prepared and studied. Two pretreated process were studied to investigate the effect of pretreating process of the catalysts on the reduction of SO2 by CO. One was using the mixture of SO2 and CO for catalysts sulfurized and poisoned in the presence of oxygen and the other was using SO2 and CO pre-reduced in the absence of oxygen. The evaluations were based on the SO2 conversion as well as sulfur selectivity and COS produced in a gradientless, quartz tubular packed-bed reactor. It was found that the catalysts sulfurized and poisoned under the mixture of SO2 and CO in the presence of oxygen could sustain its activity better than the pre-reduced catalysts. The activity decrease of the sulfurized and poisoned catalysts was very small after 4 h reaction. But for the two pre-reduced catalysts, SO2 conversion was only 17% over one 10% doped Cu-LaCoO3 and the other was deactivated after 140 min reaction. It was also found that all the doped Cu catalysts, sulfurized and poisoned in the presence of oxygen, presented higher oxygen resistance than the pre-reduced catalysts after reaction. The SO2 conversion of all the doped Cu catalysts decreased a little over 40 h reaction, while the activity of un-doped LaCoO3 was lowered to only 0.2 times of the initial activity. The other result showed that the COS formation was minimized in the doped Cu catalysts. From the results, it could be concluded that the 10% Cu-LaCoO3 was the most effective of the catalysts for removing sulfur with little COS formation.
