Mechanism study of reduction of CO2 into formic acid by in-situ hydrogen produced from water splitting with Zn: Zn/ZnO interface autocatalytic role

Highly-efficient and autocatalytic reduction of NaHCO3 into formate by in situ hydrogen from water splitting with metal/metal oxide redox cycle

“…3 ), and these shifts are in excellent agreement with the information provided by XRD measurements that indicates that Zn and ZnO coexisted at the initial reaction time. Further deconvolution analysis of the O 1 s peak indicate that oxygen vacancies on Zn/ZnO interface increased at short reaction times (less than 10 min) [68] . These analyses and experimental results suggest that a highly efficient and rapid conversion of CO 2 and water into formate should involve an autocatalytic role of the Zn/ZnO interface formed in situ , particularly at the beginning of the reaction.…”

“…The instant unstable Zn-H species was regarded as the source of active hydrogen for hydrogenation reactions [64] . Some recent research has demonstrated that Zn/ZnO in a core-shell configuration offers great promise for the fabrication of various devices with improved features [65][66][67] . This promise is attributed to the point c The solid residue collected after the reaction of using Zn as reductant and were treated by washing with deionized water several times, filtrating and drying in air.…”

CO2 reduction into formic acid under hydrothermal conditions: A mini review

“…Except for the autocatalysis mechanism for hydrothermal CO 2 reduction to formic acid, we found the metal/metal oxidize interface is also active for catalysing CO 2 hydrogenation to formic acid. 18,23,24,28,29,35 Ye et al 29 found that the formic acid yield could be improved to 48.4% with the coexistence of Zn (23% yield with Zn existed alone) and ZnO under hydrothermal conditions. The formation of H−ZnO−H from the chemisorption of H 2 should be responsible for the production of formic acid, as the yield of formic acid was only 13% with ZnO and gaseous H 2 .…”

“…[16][17][18] In the past decade, our group had made tremendous efforts on CO 2 hydrogenation to formic acid under hydrothermal conditions and great progress had been achieved in this field. 15,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37 In this review, we systematically summarized the reaction mechanism of CO 2 conversion to formic acid with various metal-based catalysts and biomass-derived reductants including Mn, Fe, Al, Zn, 2-pyrrolidone, hexanehexol, L-alanine and so on. In addition, the effects of experimental conditions such as temperature, reaction time, pH value of water solution and water filling ratio on formic acid yield are reviewed as well.…”

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

“…CO 2 hydrogenation in bicarbonate solutions using zero‐valent metals via in situ generation of hydrogen and metal oxides as catalysts has attracted great attention . In this field, the pioneering work of Jin et al demonstrated that the reaction of bicarbonate solutions with a single zero‐valent metal (Al, Fe, Mn, and Zn) in a hydrothermal process at 250 °C is able to convert bicarbonate to formic acid with yields of 1.8–62.8 %.…”