CO<sub>2</sub> hydrogenation to acetic acid and methyl acetate via tandem catalysis.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 41387674.
- Also identified by DOI 10.1038/s41467-025-66117-9 and PMC identifier 12717239.
- Licence recorded as CC BY-NC-ND.
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Abstract
Selective hydrogenation of CO<sub>2</sub> into high-value C<sub>2+</sub> oxygenates, such as acetic acid (AA), methyl acetate (MA), and ethanol, is highly attractive yet remains a significant challenge. This study demonstrates an innovative tandem catalysis system for converting CO<sub>2</sub> to AA and MA, employing GaZrO<sub>x</sub> and hydrophobically modified MOR-8-C1@PC (PTFE+CNTs) catalysts. The upstream GaZrO<sub>x</sub> drives CO<sub>2</sub> hydrogenation to produce an effluent gas with a controlled CO/(DME + CH<sub>3</sub>OH) ratio of approximately 4, facilitating the subsequent carbonylation reaction over the MOR-based catalyst. For the downstream catalyst, surface silanization of MOR zeolite combined with a hydrophobic promoter effectively prevents water (generated during CO₂ hydrogenation) from entering the zeolite channels and greatly enhances the carbonylation activity and catalyst stability. Results show that at a CO<sub>2</sub> conversion of 27%, the selectivity towards AA and MA in the organics reaches up to 78%, with no catalyst deactivation observed over 50 hours. This strategy offers an efficient approach for converting CO<sub>2</sub> into C<sub>2+</sub> oxygenates, with promising implications for sustainable chemical production.