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In order to provide a pathway scenario for the contribution of flotation in the context of carbon neutral targets, starting from the phenomenon of CO2 optimization of flotation indexes, the studies on the direct participation of CO2 in flotation are elaborated through the change of flotation three-phase system; and the studies on the indirect participation of CO2 in flotation are reviewed from the point of view of the participation of CO2 capture-converted chemical reagents in flotation as flotation inhibitors and capture agents. On the basis of summarizing the previous studies on the direct participation of CO2 in flotation, it is pointed out that the direct participation of CO2 in flotation has limitations in space and processing objects under the current carbon neutral target. Combined with the importance of the current flotation chemicals system for flotation, the advantages of indirect CO2 participation in flotation are pointed out. On the one hand, it plays the role of optimizing and regulating the flotation index;on the other hand, it promotes the industry chain of carbon dioxide capture and conversion through the feedback of flotation, thus accelerating the rate of carbon dioxide capture and conversion, and realizing a win-win situation under the background of the goal of carbon neutrality. Therefore, it is proposed to vigorously promote the utilization of chemical products after carbon dioxide capture and conversion in flotation, which will be a new path for flotation to contribute to the carbon neutrality goal. [ABSTRACT FROM AUTHOR]

This article reviews the preparation of cyclic carbonates from alkylene oxides and CO2 catalyzed by metalloporphyrin polymers. It is found that metalloporphyrin-based porous polymers have high specific surface area, central metal of the porphyrin ring and nucleophilicity in small molecule polymerized monomers, which are the key points for efficiently catalyzing the cycloaddition reaction of epoxides and CO2 under mild conditions. However, currently synthesized metalloporphyrin polymers have some problems, such as easy pore size, unstable structure, and difficulty in adapting to large-sized epoxides. In the future, we should focus on designing and preparing dual-active site metalloporphyrin-based porous polymers with small steric hindrance, stable performance, and a large number of Lewis acid-base highly active centers, which is the direction we need to research in the future. [ABSTRACT FROM AUTHOR]

The research progress of metal-organic framework (MOFs) materials in photocatalytic carbon dioxide (CO2) cycloaddition reaction in recent years was reviewed ・ The mechanism of cycloaddition reaction of CO2 under photocatalysis was analyzed, and four modification strategies of MOFs were introduced, including structural defects of MOFs, MOFs with active catalytic metal s让es, heterojunctions with semiconductor materials, and co-catalyst functionalization of MOFs. Based on the current research status of CO2 cycloaddition reaction, the prospects and challenges of MOFs and its composites in the field of photocatalysis are presented. [ABSTRACT FROM AUTHOR]

By enlarging the H-type reactor, formic acid is produced by electrocatalytic reduction of carbon dioxide using indium metal sheet and tin metal sheet electrodes with an area of more than 100 cm2 ・ The selectivity of carbon dioxide reduction reaction products, electrolysis ability and other aspects were studied, and the optimization method of electrocatalytic formic acid production in large-scale metal electrode reactor was obtained・ The results show that the optimal conditions for the reaction are the air inlet flow rate of 40 mL/min, the current density of 一 3.0 to 一4.5 mA/cm2, and the neutral electrolyte. [ABSTRACT FROM AUTHOR]