Synthesis of Monocarboxylic Acids via Direct CO2 Conversion over Ni-Zn Intermetallic Catalysts

Synthesis of Monocarboxylic Acids via Direct CO2 Conversion over Ni-Zn Intermetallic Catalysts
정경윤박재호Malayil Gopalan SibiDeepak VermaHandi Cayadi SetiyadiMuhammad Kashif KhanNeha Karanwal곽상규한다슬남경완김재훈
CO2; hydrogenation; acetic acid; propionic acid; Ni-Zn; intermetallic phase
Issue Date
ACS catalysis
VOL 11, NO 13-8398
The direct conversion of CO2 to methane, gasoline-to-diesel range fuels, methanol, and light olefins using sustainable hydrogen sources is considered a promising approach for mitigating global warming. Nevertheless, the direct conversion of CO2 to high value-added chemicals, such as acetic acid and propionic acid (AA and PA, respectively), has not been explored to date. Herein, we report a Ni?Zn intermetallic/Zn-rich NixZnyO catalyst that directly converted CO2 to AA and PA with an overall selectivity of 77.1% at a CO2 conversion of 13.4% at 325 °C. The surface restructuring of the ZnO and NiO phases during calcination and subsequent reduction led to the formation of a Ni?Zn intermetallic on the Zn-rich NixZnyO phase. Surface-adsorbed (*CHx)n species were formed via the reverse water gas shift reaction and subsequent CO hydrogenation. Afterward, monocarboxylic acids were produced via the direct insertion of CO2 into the (*CHx)n species and subsequent hydrogenation. The synthesis of monocarboxylic acid was highly stable up to 216 h on-stream over the Ni?Zn intermetallic catalyst, and the catalyst maintained its phase structure and morphology during long-term CO2 hydrogenation. The high selectivity toward monocarboxylic acids and high stability of the Ni?Zn intermetallic demonstrated its high potential for the conversion of CO2 into value-added chemicals.
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