scholarly journals Photocatalytic Reduction of CO2 over Iron-Modified g-C3N4 Photocatalysts

Photochem ◽  
2021 ◽  
Vol 1 (3) ◽  
pp. 462-476
Author(s):  
Miroslava Edelmannová ◽  
Martin Reli ◽  
Kamila Kočí ◽  
Ilias Papailias ◽  
Nadia Todorova ◽  
...  
Keyword(s):  
Hydroxyl Radicals ◽  
Batch Reactor ◽  
Co2 Reduction ◽  
Photocatalytic Reduction ◽  
Iron Ions ◽  
Iron Nitrate ◽  
Photocatalytic Process ◽  
Photogenerated Electrons ◽  
Organic Products ◽  
Reduction Of Co2

Pure g-C3N4 sample was prepared by thermal treatment of melamine at 520 °C, and iron-modified samples (0.1, 0.3 and 1.1 wt.%) were prepared by mixing g-C3N4 with iron nitrate and calcination at 520 °C. The photocatalytic activity of the prepared materials was investigated based on the photocatalytic reduction of CO2, which was conducted in a homemade batch reactor that had been irradiated from the top using a 365 nm Hg lamp. The photocatalyst with the lowest amount of iron ions exhibited an extraordinary methane and hydrogen evolution in comparison with the pure g-C3N4 and g-C3N4 with higher iron amounts. A higher amount of iron ions was not a beneficial for CO2 photoreduction because the iron ions consumed too many photogenerated electrons and generated hydroxyl radicals, which oxidized organic products from the CO2 reduction. It is clear that there are numerous reactions that occur simultaneously during the photocatalytic process, with several of them competing with CO2 reduction.

scholarly journals Formal quantum efficiencies for the photocatalytic reduction of CO2 in a gas phase batch reactor

2019 ◽  
Vol 326 ◽  
pp. 75-81 ◽  
Author(s):  
M.A.L.R.M. Cortes ◽  
J.W.J. Hamilton ◽  
P.K. Sharma ◽  
A. Brown ◽  
M. Nolan ◽  
...  
Keyword(s):  
Gas Phase ◽  
Batch Reactor ◽  
Photocatalytic Reduction ◽  
Reduction Of Co2

scholarly journals Recent Advances in MOF-based Nanocatalysts for Photo-Promoted CO2 Reduction Applications

Catalysts ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 658 ◽  
Author(s):  
Liu ◽  
Wang ◽  
Liu ◽  
Qiao ◽  
Lv ◽  
...  
Keyword(s):  
Catalytic Mechanism ◽  
Co2 Reduction ◽  
Development Trend ◽  
Photocatalytic Reduction ◽  
Research Progress ◽  
Existing Problems ◽  
Clean Environment ◽  
Metal Organic ◽  
Reduction Of Co2 ◽  
Structure Investigations

The conversion of CO2 to valuable substances (methane, methanol, formic acid, etc.) by photocatalytic reduction has important significance for both the sustainable energy supply and clean environment technologies. This review systematically summarized recent progress in this field and pointed out the current challenges of photocatalytic CO2 reduction while using metal-organic frameworks (MOFs)-based materials. Firstly, we described the unique advantages of MOFs based materials for photocatalytic reduction of CO2 and its capacity to solve the existing problems. Subsequently, the latest research progress in photocatalytic CO2 reduction has been documented in detail. The catalytic reaction process, conversion efficiency, as well as the product selectivity of photocatalytic CO2 reduction while using MOFs based materials are thoroughly discussed. Specifically, in this review paper, we provide the catalytic mechanism of CO2 reduction with the aid of electronic structure investigations. Finally, the future development trend and prospect of photocatalytic CO2 reduction are anticipated.

scholarly journals Photocatalytic Reduction of CO2 to Methanol by Cu2O/TiO2 Heterojunctions

2021 ◽  
Vol 14 (1) ◽  
pp. 374
Author(s):  
S.-P. Cheng ◽  
L.-W. Wei ◽  
H.-Paul Wang
Keyword(s):  
Solar Energy ◽  
Visible Light ◽  
Uv Light ◽  
Light Exposure ◽  
Photocatalytic Reduction ◽  
Low Carbon ◽  
Mild Conditions ◽  
Photogenerated Electrons ◽  
Visible Light Active ◽  
Reduction Of Co2

The conversion of CO2 to low-carbon fuels using solar energy is considered an economically attractive and environmentally friendly route. The development of novel catalysts and the use of solar energy via photocatalysis are key to achieving the goal of chemically reducing CO2 under mild conditions. TiO2 is not very effective for the photocatalytic reduction of CO2 to low-carbon chemicals such as methanol (CH3OH). Thus, in this work, novel Cu2O/TiO2 heterojunctions that can effectively separate photogenerated electrons and holes were prepared for photocatalytic CO2-to-CH3OH. More visible light-active Cu2O in the Cu2O/TiO2 heterojunctions favors the formation of methanol under visible light irradiation. On the other hand, under UV-Vis irradiation for 6 h, the CH3OH yielded from the photocatalytic CO2-to-CH3OH by the Cu2O/TiO2 heterojunctions is 21.0–70.6 µmol/g-catalyst. In contrast, the yield of CH3OH decreases with an increase in the Cu2O fraction in the Cu2O/TiO2 heterojunctions. It seems that excess Cu2O in Cu2O/TiO2 heterojunctions may lead to less UV light exposure for the photocatalysts, and may decrease the conversion efficiency of CO2 to CH3OH.

scholarly journals Photocatalytic Reduction of CO2 by Halide Perovskite: Recent Advances and Future Perspectives

2021 ◽  
Author(s):  
Ali Raza Muhammad ◽  
Feng Li ◽  
Meidan Que ◽  
Liangliang Zhu ◽  
Xi Chen
Keyword(s):  
Solar Energy ◽  
Co2 Reduction ◽  
Photocatalytic Reduction ◽  
Energy Crisis ◽  
Environmental Concerns ◽  
Future Perspectives ◽  
Global Energy ◽  
Recent Advances ◽  
Halide Perovskite ◽  
Reduction Of Co2

Photocatalytic CO2 reduction to generate energy-riching fuels through solar energy provides an attractive route to alleviate the global energy crisis and environmental concerns. Searching for various photocatalysts with high catalytic...

scholarly journals Recent Advances of Photocatalytic Hydrogenation of CO2 to Methanol

Catalysts ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 94
Author(s):  
Gajanan Y. Shinde ◽  
Abhishek S. Mote ◽  
Manoj B. Gawande
Keyword(s):  
Carbon Dioxide Emissions ◽  
Co2 Reduction ◽  
Value Added ◽  
Hydrocarbon Fuel ◽  
Photocatalytic Reduction ◽  
Environmental Crisis ◽  
Mixed Metal Oxide ◽  
Metal Organic ◽  
Reduction Of Co2 ◽  
Value Added Products

Constantly increasing hydrocarbon fuel combustion along with high levels of carbon dioxide emissions has given rise to a global energy crisis and environmental alterations. Photocatalysis is an effective technique for addressing this energy and environmental crisis. Clean and renewable solar energy is a very favourable path for photocatalytic CO2 reduction to value-added products to tackle problems of energy and the environment. The synthesis of various products such as CH4, CH3OH, CO, EtOH, etc., has been expanded through the photocatalytic reduction of CO2. Among these products, methanol is one of the most important and highly versatile chemicals widely used in industry and in day-to-day life. This review emphasizes the recent progress of photocatalytic CO2 hydrogenation to CH3OH. In particular, Metal organic frameworks (MOFs), mixed-metal oxide, carbon, TiO2 and plasmonic-based nanomaterials are discussed for the photocatalytic reduction of CO2 to methanol. Finally, a summary and perspectives on this emerging field are provided.

Reversed selectivity of photocatalytic CO2 reduction over metallic Pt and Pt(II) oxide cocatalysts

2021 ◽  
Author(s):  
Junyi Wang ◽  
Youzi Li ◽  
Jiangting Zhao ◽  
Zhuo Xiong ◽  
Junying Zhang ◽  
...  
Keyword(s):  
Co2 Reduction ◽  
Underlying Mechanism ◽  
Chemical State ◽  
Photocatalytic Reduction ◽  
Major Influence ◽  
Reduction Of Co2

The chemical state of Pt in cocatalysts has a major influence on the activity and selectivity of the photocatalytic reduction of CO2; however, the underlying mechanism is unclear owing to...

Graphene Supported Tungsten Carbide as Catalyst for Electrochemical Reduction of CO2

2019 ◽  
Author(s):  
Sahithi Ananthaneni ◽  
Rees Rankin
Keyword(s):  
Tungsten Carbide ◽  
Electrochemical Reduction ◽  
Low Cost ◽  
Co2 Reduction ◽  
Platinum Group Metal ◽  
Reduction Reaction ◽  
Metal Carbides ◽  
Depth Study ◽  
Reduction Of Co2 ◽  
Co2 Reduction Reaction

<div>Electrochemical reduction of CO2 to useful chemical and fuels in an energy efficient way is currently an expensive and inefficient process. Recently, low-cost transition metal-carbides (TMCs) are proven to exhibit similar electronic structure similarities to Platinum-Group-Metal (PGM) catalysts and hence can be good substitutes for some important reduction reactions. In this work, we test graphenesupported WC (Tungsten Carbide) nanocluster as an electrocatalyst for the CO2 reduction reaction. Specifically, we perform DFT studies to understand various possible reaction mechanisms and determine the lowest thermodynamic energy landscape of CO2 reduction to various products such as CO, HCOOH, CH3OH, and CH4. This in-depth study of reaction energetics could lead to improvements and develop more efficient electrocatalysts for CO2 reduction.<br></div>

Three-dimensional porous copper-decorated bismuth-based nanofoam for boosting electrochemical reduction of CO2 to formate

2021 ◽  
Author(s):  
Yingchun Zhang ◽  
Changsheng Cao ◽  
Xintao Wu ◽  
Qi-Long Zhu
Keyword(s):  
Current Density ◽  
High Current Density ◽  
Three Dimensional ◽  
Co2 Reduction ◽  
Reduction Reaction ◽  
High Current ◽  
Porous Copper ◽  
Reduction Of Co2 ◽  
Co2 Reduction Reaction ◽  
Wide Potential

Bismuth (Bi)-based nanomaterials are considered as the promising electrocatalysts for electrocatalytic CO2 reduction reaction (CO2RR), but it is challenging to achieve high current density and selectivity in a wide potential...

Synergistic effect of phosphomolybdic acid on rhodium-based metal-organic frameworks for the efficient selective photocatalytic reduction of CO2 to CO

2021 ◽  
Author(s):  
Yurong Shan ◽  
Dexiang Liu ◽  
Chunyan Xu ◽  
Peng Zhan ◽  
Hui Wang ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Electronic Structure ◽  
Synergistic Effect ◽  
Metal Organic Frameworks ◽  
Phosphomolybdic Acid ◽  
Photocatalytic Reduction ◽  
Structure And Morphology ◽  
Spherical Structure ◽  
Metal Organic ◽  
Reduction Of Co2

In this work, PMA@NH2-MIL-68(Rh) with a mangosteen spherical structure was successfully synthesized by a hydrothermal method for the photocatalytic reduction of carbon dioxide. The electronic structure and morphology of the...

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