Improvement of CO2 Photoreduction Efficiency by Process Intensification

Zhang, Zekai; Wang, Ying; Cui, Guokai; Liu, Huayan; Abanades, Stéphane; Lu, Hanfeng

doi:10.3390/catal11080912

Cited by 12 publications

(3 citation statements)

References 57 publications

(46 reference statements)

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“…In the case of the best performing catalyst used in this work (P25/TE), the calculation of this parameters returns 1.2% efficiency. This is a very impressive result, notwithstanding the small absolute value, with respect to the literature results collected at ambient pressure and temperature [42,43] and those from natural photosynthesis (0.4%); it is attributable to the combination of the high catalytic activity of the selected samples and the very particular high pressure conditions, which are able to boost the productivity.…”

Section: Energy Efficiencymentioning

confidence: 54%

Carbon Nitride-Based Catalysts for High Pressure CO2 Photoreduction

et al. 2022

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In the current research, the productivity of CO2 photoreduction has been boosted by performing the reaction in an innovative photocatalytic reactor, which allows for operation up to 20 bar. A set of photocatalysts were used, including three types of pristine TiO2, i.e., one commercially prepared (Evonik P25), one home-prepared by flame spray pyrolysis (FSP), and one obtained by the hydrolysis of TiCl4 (TiO2exCl), a bare thermo-exfoliated carbon nitride (C3N4-TE), and binary materials composed of TiO2 and C3N4-TE. The photoreduction was carried out in water at pH 14 and in the presence of Na2SO3 as a hole scavenger. Hydrogen and very small amounts of CO were detected in the head space of the photoreactor, while in the liquid phase, the main product was formic acid, along with traces of methanol and formaldehyde. The composites P25/TE and TiO2exCl/TE were found to have a higher productivity if compared to its single constituents used alone, probably due to the heterojunction formed by coupling the two materials. Moreover, the high pressure applied in the photoreactor proved to be very effective in boosting the yield of the organic products.

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Section: Energy Efficiencymentioning

confidence: 54%

Carbon Nitride-Based Catalysts for High Pressure CO2 Photoreduction

et al. 2022

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“…Therefore, the photoreduction of CO 2 (CO 2 PR) in high-added-value products has emerged as an environmental alternative to mitigate the greenhouse effect and energy problems through CO 2 capture and air purification [5][6][7]. Inspired by natural photosynthesis [8], the scientific community has developed many biomimetic approaches to design photocatalytic systems capable of converting CO 2 molecules into valuable fuels (CO, HCHO, HCOOH, CH 3 OH and CH 4 ) under visible light irradiation [9,10]. Similarly to natural photosynthesis, CO 2 PR processing artificial photosynthesis systems (APSs) are initiated with visible light absorption by a light-harvesting molecule or photosensitizer causing charge carrier generation.…”

Section: Introductionmentioning

confidence: 99%

Zn-Cr Layered Double Hydroxides for Photocatalytic Transformation of CO2 under Visible Light Irradiation: The Effect of the Metal Ratio and Interlayer Anion

Gil-Gavilán,

Cosano,

Amaro-Gahete

et al. 2023

Catalysts

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Carbon dioxide is the main gas responsible for the greenhouse effect. Over the last few years, the research focus of many studies has been to transform CO2 into valuable products (CO, HCOOH, HCHO, CH3OH and CH4), since it would contribute to mitigating global warming and environmental pollution. Layered double hydroxides (LDHs) are two-dimensional materials with high CO2 adsorption capacity and compositional flexibility with potential catalytic properties to be applied in CO2 reduction processes. Herein, Zn-Cr LDH-based materials with different metal ratio and interlayer anions, i.e., chloride (Cl−), graphene quantum dots (GQDs), sodium dodecyl sulfate (SDS) and sodium deoxycholate (SDC), have been prepared by a co-precipitation method and characterized by different techniques. The influence of the interlayer inorganic and organic anions and the metal ratio on the application of Zn-Cr LDHs as catalysts for the photocatalytic CO2 reduction reaction under visible light irradiation is unprecedentedly reported. The catalytic tests have been carried out with Ru(bpy)32+ as photosensitizer (PS) and triethanolamine as sacrificial electron donor (ED) at λ = 450 nm. All LDHs materials exhibited good photocatalytic activity towards CO. Among them, LDH3-SDC showed the best catalytic performance, achieving 10,977 µmol CO g−1 at 24 h under visible light irradiation with a CO selectivity of 88%. This study provides pertinent findings about the modified physicochemical features of Zn-Cr LDHs, such as particle size, surface area and the nature of the interlayer anion, and how they influence the catalytic activity in CO2 photoreduction.

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“…The photoconversion of CO 2 into valuable and renewable hydrocarbon fuels on semiconductor photocatalysts has caused substantial apprehension toward the clean invention of alternative energy resources [14][15][16][17]. The photoreduction of CO 2 either in the gas or liquid phase is an ecological pathway owing to its simplicity and sustainability, particularly regarding conservational topics [18,19]. The catalytic conversion of CO 2 into value-added products, such as methanol (CH 3 OH) or other organic materials, is an additional benefit to the global warming issue [17,20,21].…”

Section: Introductionmentioning

confidence: 99%

Visible-Light-Driven CO2 Reduction into Methanol Utilizing Sol-Gel-Prepared CeO2-Coupled Bi2O3 Nanocomposite Heterojunctions

et al. 2022

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Carbon dioxide (CO2) photoreduction into renewable fuels over semiconductor photocatalysts has emerged as a green and sustainable alternative for energy production. Consequently, tremendous efforts are being performed to develop robust and sustainable photocatalysts. Therefore, visible-light active nanocomposite photocatalysts composed of 5.0–20.0 wt.% bismuth oxide (Bi2O3) and cerium oxide (CeO2) were synthesized by a sol-gel-based process. The prepared nanocomposites were evaluated for the promoted photocatalytic reduction of CO2 into methanol (CH3OH). Various characterizations of the obtained photocatalysts exposed an outstanding development of crystalline structure, morphology, and surface texture due to the presence of Bi2O3. Moreover, the absorbance of light in the visible regime was improved with enhanced charge separation, as revealed by the exploration of optical response, photoluminescence, and photocurrent measurements. The overall bandgap calculations revealed a reduction to 2.75 eV for 15% Bi2O3/CeO2 compared to 2.93 eV for pure CeO2. Moreover, the adjusted 2.8 g L−1 dose of 15% Bi2O3/CeO2 selectively produced 1300 μmol g−1 CH3OH after 9 h of visible light irradiation. This photocatalyst also exhibits bearable reusability five times. The improved progression of 15% Bi2O3/CeO2 is denoted by significant charge separation as well as enhanced mobility. This study suggests the application of metal oxide-based heterojunctions for renewable fuel production under visible light.

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Improvement of CO2 Photoreduction Efficiency by Process Intensification

Cited by 12 publications

References 57 publications

Carbon Nitride-Based Catalysts for High Pressure CO2 Photoreduction

Carbon Nitride-Based Catalysts for High Pressure CO2 Photoreduction

Zn-Cr Layered Double Hydroxides for Photocatalytic Transformation of CO2 under Visible Light Irradiation: The Effect of the Metal Ratio and Interlayer Anion

Visible-Light-Driven CO2 Reduction into Methanol Utilizing Sol-Gel-Prepared CeO2-Coupled Bi2O3 Nanocomposite Heterojunctions

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