Effective production of formic and acetic acid via CO2 hydrogenation with hydrazine by using ZrO2 catalysts

• Published in: Molecular catalysis Vol. 545; p. 113238
• Main Authors: Sagar, Tatiparthi Vikram, Kumar, Praveen, Žener, Boštjan, Šuligoj, Andraž, Kočí, Kamila, Štangar, Urška Lavrenčič
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-07-2023
• Subjects: Acetic acid; CO2 hydrogenation; CO2 utilization; Formic acid; Hydrazine; Mn-based catalysts; CO2 utilization; Acetic acid; Hydrazine; Mn-based catalysts; Formic acid; CO2 hydrogenation
• ISSN: 2468-8231; 2468-8231
• DOI: 10.1016/j.mcat.2023.113238

•CO2 hydrogenation to formic and acetic acid with indirect hydrogen source.•High surface area Mn modified ZrO2 materials synthesized via two methods.•Stabilization of Mn in lower oxidation state achieved by physical mixing method.•Catalyst with high ratio of Mn2+/Mn3+ effectively enhances the product formation.•Mn+ZrO2 catalyst showed promising activity under optimized reaction conditions.
Amorphous ZrO2 and Mn addition to ZrO2 catalysts were studied for CO2 hydrogenation to formic acid and acetic acid via an indirect hydrogen source, i.e., hydrazine monohydrate. The amorphous ZrO2 was synthesized by the precipitation method and the Mn addition was carried out by two different methods, namely, the physical mixing method (Mn+ZrO2) and the co-precipitation method (Mn-ZrO2). The XRD and XPS results show that the enhanced metal-support interaction in the co-precipitation method leads to the stabilization of Mn in its higher oxidation state. The physical mixing method leads to the stabilization of Mn in its lower oxidation state and/or metallic form, which improves hydrogen production from hydrazine and thus CO2 hydrogenation. Optimization of reaction parameters was investigated with changes in reaction conditions such as reaction time, CO2 pressure and catalyst weight.
[Display omitted]