4.6 Article

Unveiling CuO role in CO2 photoreduction process - Catalyst or reactant?

Journal

CATALYSIS COMMUNICATIONS
Volume 137, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.catcom.2020.105929

Keywords

Artificial photosynthesis; Stability of the catalyst; Copper oxide; Method of synthesis

Funding

  1. Ministry of Science, Technology, and Innovation (SisNANO Program National System of Laboratories in Nanotechnology)
  2. National Council for Scientific and Technological Development (CNPq, Brazil China Virtual Center in Nanotechnology Project)
  3. National Council for Scientific and Technological Development (CNPq) [402.287/2013-4, 141680/2015-6, 159866/2018-9]
  4. Coordination for the Improvement of Higher Education Personnel (CAPES) [001]
  5. Coordination for the Improvement of Higher Education Personnel (CAPES-Embrapa Program)
  6. Chinese Academy of Sciences (CAS) President's International Fellowship Initiative (PIFI)
  7. Sao Paulo Research Foundation (FAPESP) [18/01258-5, 15/14330-8, 16/09746-3, 16/21515-7, 14/09014-7]
  8. Embrapa Rede AgroNano
  9. CAPES/Alexander von Humboldt Foundation by Experienced Research Fellowship (CAPES) [001, 88881.145566/2017-1]
  10. Federal University of Ouro Preto [23109.004080/2019-88]
  11. Structural Characterization Laboratory (LCE) [13839]
  12. Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [14/09014-7, 16/09746-3, 15/14330-8, 16/21515-7, 18/01258-5] Funding Source: FAPESP

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We systematically investigated CO2 photoreduction catalyzed by CuO from different synthetic methods (solvothermal, coprecipitation and solid-state reaction) to understand which mechanism is prevailing for this reaction. The results showed that CuO acts as a reactant during CO2 reduction through copper carbonate formation rather than a catalyst, but the as-formed Cu-2(OH)(2)CO3 (malachite) is active as catalyst for the same reaction. Significant CO2 conversion was observed during the CuO carbonation process, reducing to lower conversion levels after complete conversion to copper carbonate.

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