Photocatalytic Reduction of CO<sub>2</sub> with H<sub>2</sub>O on Ti−β Zeolite Photocatalysts:  Effect of the Hydrophobic and Hydrophilic Properties

Ikeue, Keita; Yamashita, Hiromi; Anpo, Masakazu; Takewaki, Takahiko

doi:10.1021/jp010885g

Cited by 298 publications

(208 citation statements)

References 37 publications

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“…It is also clear that the polarity and dielectric constant of solvents, acid-base properties of supports and the hydrophobic-hydrophilic nature of catalysts have significant influences on the activation of CO 2 , the stability of CO 2 − radical anion and the catalytic activity and selectivity [59,84,181,285]. For example, through loading TiO 2 /Pd, CuO/ZnO and Li 2 O-TiO 2 on the supports of magnesium oxide, aluminium oxide and silicon dioxide, it was found that the conversion of CO 2 to C 1 -C 3 compounds took place preferentially on basic oxide supported systems, and acidic oxide supported catalysts showed more selectivity to C 1 compounds [84].…”

Section: Important Factors Affecting Co 2 Activationmentioning

confidence: 99%

“…Yet, the microporous structure of zeolites is not beneficial for the improvement of photocatalytic activity. Thus, a variety of mesoporous molecular sieves (MCM-41, MCM-48, KIT-6, FSM-16 and SBA-15) are also applied in photocatalytic CO 2 reduction [285,290,295,[304][305][306][307][308][309]. Ti-MCM-41 and Ti-MCM-48 mesoporous zeolite catalysts exhibited high photocatalytic reactivity for the reduction of CO 2 with H 2 O at 328 K to produce CH 4 and CH 3 OH in the gas phase.…”

Section: Developing Mesoporous Photocatalystsmentioning

confidence: 99%

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Design and fabrication of semiconductor photocatalyst for photocatalytic reduction of CO2 to solar fuel

et al. 2014

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The shortage of fossil fuels and the disastrous pollution of the environment have led to an increasing interest in artificial photosynthesis. The photocatalytic conversion of CO 2 into solar fuel is believed to be one of the best methods to overcome both the energy crisis and environmental problems. It is of significant importance to efficiently manage the surface reactions and the photo-generated charge carriers to maximize the activity and selectivity of semiconductor photocatalysts for photoconversion of CO 2 and H 2 O to solar fuel. To date, a variety of strategies have been developed to boost their photocatalytic activity and selectivity for CO 2 photoreduction. Based on the analysis of limited factors in improving the photocatalytic efficiency and selectivity, this review attempts to summarize these strategies and their corresponding design principles, including increased visible-light excitation, promoted charge transfer and separation, enhanced adsorption and activation of CO 2 , accelerated CO 2 reduction kinetics and suppressed undesirable reaction. Furthermore, we not only provide a summary of the recent progress in the rational design and fabrication of highly active and selective photocatalysts for the photoreduction of CO 2 , but also offer some fundamental insights into designing highly efficient photocatalysts for water splitting or pollutant degradation. INTRODUCTIONThe shortage of the energy supply and the problem of disastrous environmental pollution have been recognized as two main challenges in the near future [1]. It is a better way to efficiently and inexpensively convert solar energy into chemical fuels by developing an artificial photosynthetic (APS) system because solar fuels are high density energy carriers with long-term storage capacity. The most important and challenging reactions in APS-the photocatalytic water splitting into H 2 and O 2 (water reduction and oxidation) [2][3][4] and photoreduction of CO 2 to solar fuel, such as CH 4 and CH 3 OH [5,6] have been extensively studied since the photocatalytic water splitting on TiO 2 electrodes was discovered by Honda and Fujishima in 1972 [7]. The photocatalytic reduction of CO 2 by means of solar energy has attracted growing attention in the recent years, which 1 State Key Laboratory of Advanced Technology for Material Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China 2 College of Science, South China Agricultural University, Guangzhou 510642, China 3 Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia * Corresponding author (email: jiaguoyu@yahoo.com) is also believed to be one of the best methods to overcome both global warming and energy crisis [8]. However, it is also generally thought that photocatalytic CO 2 reduction is a more complex and difficult process than H 2 production due to preferential H 2 production and low selectivity for the carbon species produced [9,10]. The progress achieved in the photoreduction of CO 2 is still far behind that in wate...

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Section: Important Factors Affecting Co 2 Activationmentioning

confidence: 99%

Section: Developing Mesoporous Photocatalystsmentioning

confidence: 99%

Design and fabrication of semiconductor photocatalyst for photocatalytic reduction of CO2 to solar fuel

et al. 2014

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“…8,10 The product distribution between methanol and methane was influenced by the hydrophilic character of the solid. 9 Overall yields were found to be higher for mesoporous than microporous silicate hosts. Development of framework Ti-containing mesoporous silicate films that are optically transparent (as opposed to the light-scattering pressed wafers of crystallites) has allowed the determination of the quantum efficiency, which is around 0.3% (300 nm).…”

Section: Introductionmentioning

confidence: 96%

CO₂ Splitting by H₂O to CO and O₂ under UV Light in TiMCM-41 Silicate Sieve

2004

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The 266 nm light-induced reaction of CO 2 and H 2 O gas mixtures (including isotopic modifications 13 CO 2 , C 18 O 2 , and D 2 O) in framework TiMCM-41 silicate sieve was monitored by in-situ FT-IR spectroscopy at room temperature. Carbon monoxide gas was observed as the sole product by infrared, and the growth was found to depend linearly on the photolysis laser power. H 2 O was confirmed as stoichiometric electron donor. The work establishes CO as the single photon, 2-electron transfer product of CO 2 photoreduction by H 2 O at framework Ti centers for the first time. O 2 was detected as co-product by mass spectrometric analysis of the photolysis gas mixture. These results are explained by single UV photon-induced splitting of CO 2 by H 2 O to CO and surface OH radical.

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“…34 This material absorbs in the UV-Vis region of the spectrum (200-350 nm) and it can be used as a photocatalyst, since this material has suitable banding positions for the reduction of CO 2 to oxygenated products. 35,36 Ikeue et al 37 applied a similar titanosilicate, the TS-1, as photocatalyst to convert CO 2 and water using UV light, producing CH 3 OH and CH 4 . From our best knowledge, titanosilicate ETS-10 has not been reported as photocatalyst for CO 2 photoreduction, although this material has been employed in dye photodegradation reactions.…”

Section: Introductionmentioning

confidence: 99%

ETS‑10 Modified with CuxO Nanoparticles and Their Application for the Conversion of CO2 and Water into Oxygenates

Januario

Nogueira

Pastore

2018

J. Braz. Chem. Soc.

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Photocatalytic reactions to convert CO 2 and H 2 O into solar fuels using only solar irradiation have been investigated in this work. For this purpose, titanosilicate ETS-10 was decorated with Cu 2 O and CuO nanoparticles and their properties were analyzed by different techniques. The final materials were applied in photoreduction of CO 2 in gas phase under 20 h of solar irradiation. In the final, the products oxygen, acetic acid, formaldehyde and methanol were detected by chromatographic techniques. Photoluminescence and electrochemical studies indicate the interaction between Cu x O nanoparticles and Ti-O-Ti-O on the surface of ETS-10, corroborating with the results obtained in the photocatalytic experiments. The best CO 2 photoconversion efficiencies into methanol were obtained when using ETS-10/Cu x O compared to pure ETS-10. Another important finding in this study is the fact that the reactions were carried out in the gas phase and no scavenge donors were employed.Keywords: CO 2 photoreduction, ETS-10 photocatalyst, oxygenated products, copper oxide, solar irradiation IntroductionIn the last 40 years, CO 2 emissions from fossil fuel combustion and industrial processes contributed with about 78% of the total greenhouse gases (GHG) emissions. 1 Different methods to consume CO 2 have been investigated, such as thermochemical conversion, 2-4 electrochemical reduction, [5][6][7] and photocatalytic reduction of CO 2 and water into hydrocarbons or solar fuels. [8][9][10] The use of solar energy has been highlighted as an alternative to obtain clean energy while simultaneously reducing the CO 2 concentration in the atmosphere. 11 Many chemicals are reported to be produced from water and CO 2 : formic acid, 12,13 acetic acid, 14,15 formaldehyde, 16 methanol [17][18][19] and methane. 20,21 Using a combination of metaloxides and co-catalysts we have already demonstrated the feasibility to produce both methane and methanol. 22 The first and principal step in CO 2 reduction is the oxidation of H 2 O molecules into oxygen and protons (equation 1), following the sequence described in equations 1-5. 23 Several works report the conversion to oxygenated chemicals by using sacrificial compounds, such as NaOH, 24 Titanosilicate ETS-10 (Engelhard titanium silicate) was first reported in the literature by Chapman and Roe 28 in 1990, however its structure was elucidated only in 1994 by Anderson et al. 29 using sophisticated techniques as highresolution transmission electron microscopy (HRTEM), nuclear magnetic resonance (NMR) and molecular simulations. The most interesting feature is that the ETS-10 contains a periodic structure of quantum semiconductor wires of [-O-Ti-O-Ti-] formed by TiO 6 octahedra isolated along the structure. The pores (ca. 0.67 nm diameter) run along [100] and [010] directions. [30][31][32][33] These properties make ETS-10 unique, because a short Ti-O bond length (1.71-2.11 Å) along the axial direction would not be possible outside of a zeolite framework. 34 This material absorbs ETS-10 Modified with Cu ...

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Photocatalytic Reduction of CO₂ with H₂O on Ti−β Zeolite Photocatalysts: Effect of the Hydrophobic and Hydrophilic Properties

Cited by 298 publications

References 37 publications

Design and fabrication of semiconductor photocatalyst for photocatalytic reduction of CO2 to solar fuel

Design and fabrication of semiconductor photocatalyst for photocatalytic reduction of CO2 to solar fuel

CO₂ Splitting by H₂O to CO and O₂ under UV Light in TiMCM-41 Silicate Sieve

ETS‑10 Modified with CuxO Nanoparticles and Their Application for the Conversion of CO2 and Water into Oxygenates

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Photocatalytic Reduction of CO2 with H2O on Ti−β Zeolite Photocatalysts: Effect of the Hydrophobic and Hydrophilic Properties

Cited by 298 publications

References 37 publications

Design and fabrication of semiconductor photocatalyst for photocatalytic reduction of CO2 to solar fuel

Design and fabrication of semiconductor photocatalyst for photocatalytic reduction of CO2 to solar fuel

CO2 Splitting by H2O to CO and O2 under UV Light in TiMCM-41 Silicate Sieve

ETS‑10 Modified with CuxO Nanoparticles and Their Application for the Conversion of CO2 and Water into Oxygenates

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Product

Resources

About

Photocatalytic Reduction of CO₂ with H₂O on Ti−β Zeolite Photocatalysts: Effect of the Hydrophobic and Hydrophilic Properties

CO₂ Splitting by H₂O to CO and O₂ under UV Light in TiMCM-41 Silicate Sieve