Industrialization, overuse of fossil fuels, and population growth are among the many culprits that have increased atmospheric CO2 concentrations so much in recent decades that humanity is already facing serious environmental problems. By capturing, using and converting CO2, we would not only reduce the amount of this greenhouse gas, but also gain valuable chemicals. One of the ways to reduce the concentration of CO2 in the atmosphere is to convert CO2 into HCOOH, which is not only an important liquid material for hydrogen storage but also a C1 building block for the chemical industry. The aim of this work was to propose a sustainable method for hydrogenation of CO2 to formic acid using hydrazine hydrate as an indirect hydrogen source, and to synthesize and select a catalyst that is highly active and selective in this process. Manganese modified ZrO2 calcined at 900 °C (Mn+ZrO2-m) proved to be the most active catalyst, with which further reactions were carried out to optimize the conditions.
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