CO2 Photoreduction Product Selectivity with TiO2−Cu Nanocatalysts under Different Reaction Media

Author:

Nascimento Victor R. S.12,Torres Juliana A.34,Iga Gustavo D.34,dos Santos Allef Leite35,Egues Silvia M.12,Filho José B. G.3,Ferreira Luiz F. R.6,Ribeiro Caue3ORCID

Affiliation:

1. Graduate Program in Process Engineering Tiradentes University Av. Murilo Dantas, 300 49032-490 Aracaju SE Brazil

2. Institute of Technology and Research. Av. Murilo Dantas, 300 Farolândia, 49032-490 Aracaju SE Brazil

3. Embrapa Instrumentation Rua XV de Novembro, 1452 13560-970 São Carlos SP Brazil

4. Department of Chemistry Federal University of São Carlos (UFSCar) 13565-905 São Carlos SP Brazil

5. São Paulo University Chemistry Institute of São Carlos Av. Trabalhador São Carlense, 400 13566-590 São Carlos SP Brazil

6. Graduate Program in Genomic Sciences and Biotechnology Catholic University of Brasília 71966-700 Brasília Brazil

Abstract

AbstractThis study explores photocatalytic conversion of CO2 using TiO2−Cu heterojunctions with different Cu contents and investigates influence of different reaction media on the process efficiency. The use of KOH favored liquid products, especially ethanol. An analysis of H2 production as the main competitive reaction was done. Sodium oxalate led to an increase in H2 evolution by approximately 600 μmol g‐1 compared to pure water, in the presence of CO2 in the reaction medium, but the blank test (without CO2) indicates a lower H2 yield (~136 μmol g−1), which suggests that the competitive reaction with CO2 also plays a role in H2 production. This role was related to the decrease of the initial pH from approximately 8.5 to 5.2, stabilizing at 5.5 at the end of the 6 h reaction. In an environment saturated with N2, the pH increases to 9 and stabilizes at 7.8 at the end of the process. In the presence of acetic acid, both CO and H2 production were suppressed, with a significant increase in the selectivity for methane via cleavage of the acid‘s carbon bond. The findings underscore the importance of optimizing reaction conditions to achieve higher yields of desired products in the photocatalytic conversion of CO2.

Funder

Fundação de Amparo à Pesquisa do Estado de São Paulo

Financiadora de Estudos e Projetos

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior

Fundação de Amparo à Pesquisa do Estado de Minas Gerais

Publisher

Wiley

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