Issue 8, 2024

Pressure-dependent CO2 thermolysis on barium titanate nanocatalysts

Abstract

Rising CO2 levels pose a significant threat to global warming, extreme weather events, and ecosystem disruption. Mitigating these effects requires a reduction in CO2 concentration using innovative technologies for CO2 capture, storage, and utilization. Perovskite-type barium titanate nanocatalysts have the potential for high CO2 conversion into valuable solid carbon products at low temperatures. In this study, we investigated the pressure-dependent CO2 conversion activity of barium titanate nanocatalysts at 700 K. A key focus of this study is the impact of pressure on the interaction between CO2 molecules and barium titanate nanocatalysts to evaluate the CO2 conversion mechanism. The primary structures of the nanocatalysts remained unchanged after CO2 thermolysis, whereas carbon was deposited on the nanocatalysts above 0.05 MPa. The reactant carbons after CO2 conversion at various pressures between 0.01 and 1.0 MPa at 700 K were evaluated by temperature-programmed desorption in an O2 atmosphere. The desorption peaks observed at approximately 500 K, 800–900 K, and 900–1300 K were the results of desorption of chemisorbed CO2, less- and high-crystalline graphitic carbons. Chemisorbed CO2 and less-crystalline graphitic carbon were observed at 0.05 MPa. Highly crystalline graphitic carbons were observed on the nanocatalysts after CO2 thermolysis at 0.1–1.0 MPa as well as chemisorbed CO2, although the amount of carbon at 1.0 MPa was smaller than the others. Therefore, the approach of CO2 thermolysis at a low temperature of 700 K and 0.1–0.5 MPa is promising for producing valuable solid carbon products and mitigating the environmental impact of CO2 emissions.

Graphical abstract: Pressure-dependent CO2 thermolysis on barium titanate nanocatalysts

Supplementary files

Article information

Article type
Paper
Submitted
21 May 2024
Accepted
24 Jun 2024
First published
01 Jul 2024
This article is Open Access
Creative Commons BY-NC license

RSC Sustain., 2024,2, 2218-2224

Pressure-dependent CO2 thermolysis on barium titanate nanocatalysts

S. Takawane, M. Miyamoto, T. Watanabe and T. Ohba, RSC Sustain., 2024, 2, 2218 DOI: 10.1039/D4SU00253A

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