Special Issue "Photocatalytic Reduction of CO2"

A special issue of Catalysts (ISSN 2073-4344). This special issue belongs to the section "Photocatalysis".

Deadline for manuscript submissions: closed (30 June 2021) | Viewed by 6067

Special Issue Editor

Dr. Martin Reli
E-Mail Website
Guest Editor
Institute of Environmental Technology, VŠB-TU Ostrava, 17. listopadu 15/2172, 708 00 Ostrava, Czech Republic
Interests: photocatalysis; CO2 photoreduction; hydrocarbon production

Special Issue Information

Dear Colleagues,

Carbon dioxide and its emissions represent a hot topic in global warming discussions. However, it also represents the most abundant source of carbon which is not utilized. The idea of conversion of carbon dioxide into other useful chemicals such as methanol or methane and their utilization as fuels could help with the world’s emerging energy shortage. Even though photocatalytic reduction of CO2 has been studied for many years, its exact reaction mechanism is not known, and even the reaction itself represents a challenge. This Special Issue collects original research papers, reviews, and commentaries focused on improving the knowledge of photocatalytic reduction of carbon dioxide, including new reactor design, novel photocatalysts, and especially understanding of reaction mechanisms.   

Dr. Martin Reli
Guest Editor

Manuscript Submission Information

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Keywords

  • Photocatalytic reduction of CO2
  • Reaction mechanism of CO2 photoreduction
  • Reactor design for CO2 photoreduction
  • CO2 to fuels
  • Hydrocarbon production from CO2

Published Papers (4 papers)

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Research

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Article
Improvement of CO2 Photoreduction Efficiency by Process Intensification
Catalysts 2021, 11(8), 912; https://doi.org/10.3390/catal11080912 - 28 Jul 2021
Cited by 1 | Viewed by 839
Abstract
This paper addresses an innovative approach to improve CO2 photoreduction via process intensification. The principle of CO2 photoreduction using process intensification is presented and reviewed. Process intensification via concentrating solar light technology is developed and demonstrated. The concept consists in rising [...] Read more.
This paper addresses an innovative approach to improve CO2 photoreduction via process intensification. The principle of CO2 photoreduction using process intensification is presented and reviewed. Process intensification via concentrating solar light technology is developed and demonstrated. The concept consists in rising the incident light intensity as well as the reaction temperature and pressure during CO2 photoreduction using concentrating solar light. A solar reactor system using concentrated sunlight was accordingly designed and set up. The distribution of light intensity and temperature in the reactor was modeled and simulated. CO2 photoreduction performance in the reactor system was assessed, and the reaction temperature and pressure evolution were recorded. The results showed that the light intensity, temperature, and pressure could be effectively increased and irradiation on the catalyst surface followed a Gaussian distribution. The CO2 photoreduction reaction rates were enhanced to hundreds of times. Full article
(This article belongs to the Special Issue Photocatalytic Reduction of CO2)
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Article
Energy Transport of Photocatalytic Carbon Dioxide Reduction in Optical Fiber Honeycomb Reactor Coupled with Trough Concentrated Solar Power
Catalysts 2021, 11(7), 829; https://doi.org/10.3390/catal11070829 - 08 Jul 2021
Cited by 1 | Viewed by 720
Abstract
Thanks to the high photon efficiency and reaction density, the optical fiber monolith reactor (OFMR) for InTaO4-based CO2 photoreduction is regarded as a promising photoreactor. In this work, the OFMR coupling with parabolic trough concentrator (PTC) is proposed to enlarge [...] Read more.
Thanks to the high photon efficiency and reaction density, the optical fiber monolith reactor (OFMR) for InTaO4-based CO2 photoreduction is regarded as a promising photoreactor. In this work, the OFMR coupling with parabolic trough concentrator (PTC) is proposed to enlarge the daylighting area by several times without increasing the cost of photocatalysts. Based on the Monte Carlo ray-tracing (MCRT) approach and the finite volume method (FVM), a computational model of the reaction module considering the light, heat, and mass transfer is developed to optimize the fiber honeycomb reactor coupled with the PTC. As a result, the volume-averaged concentration of production reaches 1.85 × 10−4 mol·m−3, which is much higher than the traditional OFMR with the production concentration of 9.61 × 10−6 mol·m−3 under the same condition. The optimized structure of the monolith for better photocatalytic performance is obtained. It shows that the diameters of gas channels ranging from 1.5 to 2 mm are beneficial to the reaction efficiency. Finally, the results suggested that the even number of the gas channel should be avoided due to the pseudo-steady zone in the middle of the monolith. The reaction element with the high serial number along the flow direction has the reduced reaction density and endangers the organic optical fibers especially when the serial number exceeds 5. Full article
(This article belongs to the Special Issue Photocatalytic Reduction of CO2)
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Article
Photocatalytic H2 Evolution, CO2 Reduction, and NOx Oxidation by Highly Exfoliated g-C3N4
Catalysts 2020, 10(10), 1147; https://doi.org/10.3390/catal10101147 - 03 Oct 2020
Cited by 8 | Viewed by 1287
Abstract
g-C3N4, with specific surface area up to 513 m2/g, was prepared via three successive thermal treatments at 550 °C in air with gradual precursor mass decrease. The obtained bulk and exfoliated (1ex, 2ex and 3ex) g-C3 [...] Read more.
g-C3N4, with specific surface area up to 513 m2/g, was prepared via three successive thermal treatments at 550 °C in air with gradual precursor mass decrease. The obtained bulk and exfoliated (1ex, 2ex and 3ex) g-C3N4 were characterized and tested as photocatalysts for H2 production, CO2 reduction and NOx oxidation. The exfoliated samples demonstrated graphene-like morphology with detached (2ex) and sponge-like framework (3ex) of layers. The surface area increased drastically from 20 m2/g (bulk) to 513 m2/g (3ex). The band gap (Eg) increased gradually from 2.70 to 3.04 eV. Superoxide radicals (·O2) were mainly formed under UV and visible light. In comparison to the bulk, the exfoliated g-C3N4 demonstrated significant increase in H2 evolution (~6 times), CO2 reduction (~3 times) and NOx oxidation (~4 times) under UV light. Despite the Eg widening, the photocatalytic performance of the exfoliated g-C3N4 under visible light was improved too. The results were related to the large surface area and low e-h+ recombination. The highly exfoliated g-C3N4 demonstrated selectivity towards H2 evolution reactions. Full article
(This article belongs to the Special Issue Photocatalytic Reduction of CO2)
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Review

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Review
Layered Double Hydroxide (LDH) Based Photocatalysts: An Outstanding Strategy for Efficient Photocatalytic CO2 Conversion
Catalysts 2020, 10(10), 1185; https://doi.org/10.3390/catal10101185 - 14 Oct 2020
Cited by 20 | Viewed by 2298
Abstract
CO2 conversion to solar fuels/chemicals is an alluring approach for narrowing critical issues of global warming, environmental pollution, and climate change, caused by excess atmospheric CO2 concentration. Amongst various CO2 conversion strategies, photocatalytic CO2 conversion (PCC) is considered as [...] Read more.
CO2 conversion to solar fuels/chemicals is an alluring approach for narrowing critical issues of global warming, environmental pollution, and climate change, caused by excess atmospheric CO2 concentration. Amongst various CO2 conversion strategies, photocatalytic CO2 conversion (PCC) is considered as a promising approach, which utilizes inexpensive sunlight and water with a photocatalyst material. Hence, development of an efficient and a stable photocatalyst is an essential activity for the respective scientific community to upscale the PCC research domain. Until today, metal oxides, such as TiO2, ZnO, etc., are categorized as standard photocatalysts because of their relative stability, abundant availability and low cost. However, their performance is tethered by limited light absorption and somewhat physical properties. Recently, layered double hydroxides (LDHs) have offered an exciting and efficient way for PCC due to their superb CO2 adsorption and moderate photocatalytic properties. The LDH based photocatalysts show marvelous physiochemical and electrical properties like high surface area, stability, and excellent conductivity. In the present review article, a summarized survey is portrayed regarding latest development for LDH based photocatalysts with a focus on synthesis strategies employing various photocatalyst materials, influencing parameters and possible mechanism involved in PCC to useful fuels and chemicals like CO, CH4, CH3OH, and H2. Full article
(This article belongs to the Special Issue Photocatalytic Reduction of CO2)
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