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High-efficiency photoreduction of CO 2 in a low vacuum.

Authors :: Liu Y
Kang S
Li T
Hu Z
Ren Y
Pan Z
Fu X
Wang L
Feng S
Luo J
Feng L
Lu W
Source :: Physical chemistry chemical physics : PCCP [Phys Chem Chem Phys] 2022 Jun 29; Vol. 24 (25), pp. 15389-15396. Date of Electronic Publication: 2022 Jun 29.
Publication Year :: 2022
Abstract: Photoreduction of CO <subscript>2</subscript> into CO, CH <subscript>4</subscript> or hydrocarbons is attractive, due to environmental compatibility and economic feasibility. Optimizing the reaction engineering of CO <subscript>2</subscript> reduction is an effective and general strategy that should be given special consideration. In this article, the photocatalytic CO <subscript>2</subscript> reduction performances are originally investigated in a low vacuum in both dilute (10%) and pure CO <subscript>2</subscript> . We discover that the CH <subscript>4</subscript> yield increased above one hundred times as the vacuum degree increased from barometric pressure to -80 kPa in dilute CO <subscript>2</subscript> . It also reveals long-term stability and good cycling performance in a low vacuum. The enhanced CO <subscript>2</subscript> photoreduction performance in a low vacuum comes from better accumulation of photogenerated electrons, less intense Brownian movement of gas molecules in the environment and hindrance of the active site-blocking of gas molecules in the environment. Improved photocatalytic CO <subscript>2</subscript> reduction in a low vacuum is further verified by Pt-TiO <subscript>2</subscript> catalysts. This research presents a general route for producing clean fuels by photocatalytic CO <subscript>2</subscript> reduction in a more effective way.