The effects of various factors on the electrocarboxylation of organic compounds with carbon dioxide catalyzed by metalloporphyrin are studied.The optimal potential of electrocar- boxylation is -1.6 V(vs.SCE).A weak pr...The effects of various factors on the electrocarboxylation of organic compounds with carbon dioxide catalyzed by metalloporphyrin are studied.The optimal potential of electrocar- boxylation is -1.6 V(vs.SCE).A weak protic solvent methanol can enhance catalytic activity. Tetrabutylammonium iodide is the best one of five electrolytes.The yields and current efficiencies of electrocarboxylation are increased slowly as the concentration of catalyst increases.展开更多
The effects of peptides,amino acids and organic bases as an axial ligand on reaction ac- tivities in the electrocarboxylation of benzyl chloride with CO_2 catalyzed by CoTPP are reported. The imidazole organic base,pe...The effects of peptides,amino acids and organic bases as an axial ligand on reaction ac- tivities in the electrocarboxylation of benzyl chloride with CO_2 catalyzed by CoTPP are reported. The imidazole organic base,peptide containing —SH and amino acid containing imidazolyl en- hance the catalytic activity.The effect of imidazole amounts on the catalytic activity of CoTPP is studied.展开更多
The catalyzation of CoTPP for electrocarboxylation of alkyl halides, alkenes and ketones with CO_2 are studied. The electrocarboxylation of these organic compounds with CO_2 in the presenec of catalyst can occur at mo...The catalyzation of CoTPP for electrocarboxylation of alkyl halides, alkenes and ketones with CO_2 are studied. The electrocarboxylation of these organic compounds with CO_2 in the presenec of catalyst can occur at more positive potential than that of no catalyst. The products of electrocarboxylation were identified by UV, IR and GC-MS. The electrocarboxylation mechanisms of different organic compounds are discussed.展开更多
二氧化碳(CO_(2))是主要的温室气体,但同时也是一种储量巨大、廉价、安全且易得的可再生资源。在我国“碳达峰、碳中和”战略目标的驱动下,如何有效减少CO_(2)排放并转而利用这一重要碳资源已成为当前的研究热点与重点,这同时也加快了CO...二氧化碳(CO_(2))是主要的温室气体,但同时也是一种储量巨大、廉价、安全且易得的可再生资源。在我国“碳达峰、碳中和”战略目标的驱动下,如何有效减少CO_(2)排放并转而利用这一重要碳资源已成为当前的研究热点与重点,这同时也加快了CO_(2)捕集、利用与封存(carbon capture,utilization and storage,CCUS)技术的发展和创新。生物转化是实现CO_(2)利用的主要路径之一,既能够直接催化、转化CO_(2)合成目标产物,也可以与化学催化路径相耦合实现对CO_(2)来源的有机低碳资源(如甲醇、甲酸、乙酸)的有效转化及定向合成,因此有望在国家“双碳”目标的实现中发挥重要作用。本文对近年来CO_(2)生物转化的研究进展进行了梳理和总结,指出了现有技术路线的特点和不足,并对今后的研究重点和方向提出了建议。总体而言,CO_(2)生物利用技术目前尚处于起步阶段。基于化能自养细菌的合成气(CO_(2)/CO)发酵生产乙醇虽已实现工业化,但仍需要进一步优化和提高CO_(2)的转化利用效率,并获得除乙醇外更多的高值产品,从而提升整个技术路线的经济性。而其他的CO_(2)生物转化路径,无论是化学-生物发酵耦合还是体外酶催化,目前离大规模应用还有较大距离,需要进一步优化技术体系和降低成本来满足工业化需求。展开更多
A novel electrochromic display composed of polymeric solid electrolyte and ferroin electroactive species has been assembled, which presents a reversible variation of the color between light blue and red when a potenti...A novel electrochromic display composed of polymeric solid electrolyte and ferroin electroactive species has been assembled, which presents a reversible variation of the color between light blue and red when a potential of 0.98 and 0.75 V is applied respectively. The results indicate that the response speed is increased by lowering the concentration of ferroin without decreasing color contrast.展开更多
文摘The effects of various factors on the electrocarboxylation of organic compounds with carbon dioxide catalyzed by metalloporphyrin are studied.The optimal potential of electrocar- boxylation is -1.6 V(vs.SCE).A weak protic solvent methanol can enhance catalytic activity. Tetrabutylammonium iodide is the best one of five electrolytes.The yields and current efficiencies of electrocarboxylation are increased slowly as the concentration of catalyst increases.
文摘The effects of peptides,amino acids and organic bases as an axial ligand on reaction ac- tivities in the electrocarboxylation of benzyl chloride with CO_2 catalyzed by CoTPP are reported. The imidazole organic base,peptide containing —SH and amino acid containing imidazolyl en- hance the catalytic activity.The effect of imidazole amounts on the catalytic activity of CoTPP is studied.
基金This work is supported by the National Natural Science Foundation of China
文摘The catalyzation of CoTPP for electrocarboxylation of alkyl halides, alkenes and ketones with CO_2 are studied. The electrocarboxylation of these organic compounds with CO_2 in the presenec of catalyst can occur at more positive potential than that of no catalyst. The products of electrocarboxylation were identified by UV, IR and GC-MS. The electrocarboxylation mechanisms of different organic compounds are discussed.
文摘二氧化碳(CO_(2))是主要的温室气体,但同时也是一种储量巨大、廉价、安全且易得的可再生资源。在我国“碳达峰、碳中和”战略目标的驱动下,如何有效减少CO_(2)排放并转而利用这一重要碳资源已成为当前的研究热点与重点,这同时也加快了CO_(2)捕集、利用与封存(carbon capture,utilization and storage,CCUS)技术的发展和创新。生物转化是实现CO_(2)利用的主要路径之一,既能够直接催化、转化CO_(2)合成目标产物,也可以与化学催化路径相耦合实现对CO_(2)来源的有机低碳资源(如甲醇、甲酸、乙酸)的有效转化及定向合成,因此有望在国家“双碳”目标的实现中发挥重要作用。本文对近年来CO_(2)生物转化的研究进展进行了梳理和总结,指出了现有技术路线的特点和不足,并对今后的研究重点和方向提出了建议。总体而言,CO_(2)生物利用技术目前尚处于起步阶段。基于化能自养细菌的合成气(CO_(2)/CO)发酵生产乙醇虽已实现工业化,但仍需要进一步优化和提高CO_(2)的转化利用效率,并获得除乙醇外更多的高值产品,从而提升整个技术路线的经济性。而其他的CO_(2)生物转化路径,无论是化学-生物发酵耦合还是体外酶催化,目前离大规模应用还有较大距离,需要进一步优化技术体系和降低成本来满足工业化需求。
文摘A novel electrochromic display composed of polymeric solid electrolyte and ferroin electroactive species has been assembled, which presents a reversible variation of the color between light blue and red when a potential of 0.98 and 0.75 V is applied respectively. The results indicate that the response speed is increased by lowering the concentration of ferroin without decreasing color contrast.
