In Situ Hydrogenation of CO₂ by Al/Fe and Zn/Cu Alloy Catalysts under Mild Conditions

Abstract

The development of efficient metal catalysts for in situ hydrogenation of CO 2 in water under mild conditions has gained considerable attention. Three Al alloys (Al/Fe, Al/Fe/Cu, Al/Cu) and three Zn/Cu alloys for in situ hydrogenation of CO 2 in aqueous bicarbonate solutions were investigated. Hydrogen was generated by reaction of Al, Fe, and Zn in the alloys with water. In situ hydrogenation of CO 2 was likely to be catalyzed by intermetallic compounds and generated metal oxides. Al alloys catalyzed the hydrogenation to methane while Zn/Cu alloys produced CO and formic acid. Zn/Cu5 possessed the highest catalytic activity, which was attributed to the CuZn5 crystal planes in the alloys. Insights are provided into the importance of compositions and structures of alloys for the selectivity for in situ hydrogenation of CO 2 in aqueous bicarbonate solutions.

Recent Advances Hydrogenation of Carbon Dioxide to Light Olefins over Iron-Based Catalysts via the Fischer–Tropsch Synthesis

“…In recent years, the excessive use of fuels such as oil, coal, and natural gas has greatly contributed to the development of the economy and human society, but the increasing carbon dioxide emissions in the course of development have also brought about various environmental challenges, such as the greenhouse effect, ocean acidification, and climate anomaly. − Despite CO 2 being a greenhouse gas, CO 2 is a nontoxic carbon source that provides a fungible pathway to produce high-value-added products. , The direct conversion of CO 2 into value-added products is not only conducive to alleviating environmental issues caused by excessive CO 2 emission, but also realizes the resource utilization of CO 2 . − Therefore, CO 2 hydrogenation to value-added chemicals is an excellent way to reduce CO 2 concentrations and arouse the interest of researchers. − …”