Selective formation of CH3OH in the photocatalytic reduction of CO2 with H2O on titanium oxides highly dispersed within zeolites and mesoporous molecular sieves

Yamashita, Hiromi; Fujii, Yo; Ichihashi, Yuichi; Zhang, Shu Gou; Ikeue, Keita; Park, Dal Ryung; Koyano, Keiko A.; Tatsumi, Takashi; Anpo, Masakazu

doi:10.1016/s0920-5861(98)00219-3

Cited by 245 publications

(176 citation statements)

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“…The order of methane formation activity from this study is: enhance the activity of the catalysts because more active sites are available (16). Combine with our data, this suggests that one method to boost the activity of the catalysts used in this study would be to deposit them on high-surface area supports.…”

Section: Reductionsupporting

confidence: 66%

CO2 Sequestration and Recycle by Photosynthesis

Chuang¹

2005

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Hydrocarbon synthesis from photocatalytic reactions of CO 2 and H 2 O over various catalysts has been studied by UV-visible light. The quantum efficiencies suggest that Pd/TiO 2 sol gel exhibits the highest activity for hydrocarbon synthesis from photocatalytic reactions. The in situ IR was able to monitor the adsorbed hydrocarbon species. The UV-visible, IR spectroscopy and XRD techniques were used to characterize the catalysts to obtain the information of properties of the process and catalyst before/after reaction. The UV-visible spectroscopy provides the information about the surface band gap energy of each catalyst. In situ UV-visible studies reveals that TiO 2 -supported catalysts require the higher energy (i.e.shorter wavelength) to pass through the water-thin film deposited on the surface to activate the photocatalytic reaction. XRD data show there is changes in the crystal structure of TiO 2 sol gel from photon energy during photo reaction. Studies on photocatalytic oxidation of methylene blue show that the photocatalytic oxidation rate is significantly higher than the photocatalytic reduction rate on TiO 2 based catalysts. The information from this study can lead to a better understanding of the nature of the catalysts and photoreaction processes, which might provide the information to develop better catalysts and reaction process for the hydrocarbon synthesis from photocatalytic reactions of CO 2 and H 2 O.3

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Section: Reductionsupporting

confidence: 66%

CO2 Sequestration and Recycle by Photosynthesis

Chuang¹

2005

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“…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%

“…on TiO 2 photocatalysts can greatly boost their photocatalytic activities for CO 2 reduction to CH 4 (in decreasing order). The addition of Pt onto the highly dispersed titanium oxide catalysts promotes the charge separation which leads to an increase in the formation of CH 4 in place of CH 3 OH [305]. Pt NP/TiO 2 nanotube composite greatly promoted the photocatalytic conversion of CO 2 and water vapor into methane due to a large number of active reduction sites from the homogeneous distribution of metal co-catalyst NPs over the TiO 2 nanotube array surface [186].…”

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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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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“…Scientific challenges in the domain of storing solar energy by CO 2 conversion are larger than for hydrogen synthesis. CO 2 conversion in the presence of water can lead to different products, such as methane or methanol, and little is known about the role of the chemical composition and surface structure of electrocatalytic and photo-catalytic converters in triggering selectivity [19][20][21][26][27][28][29]. In the following case studies we will further address the options for chemical storage of solar energy.…”

Section: Minerals (Including P and N In Suitable Formmentioning

confidence: 99%

“…While some interesting results have been reported, productivity is still beyond the limit to design a viable process. Besides studies on crystalline TiO 2 based catalysts, Ti-containing siliceous materials, such as TS-1, Ti-MCM-41, Ti-MCM-48 and Ti-SBA-15 were found to yield high methane production rates in gas phase photocatalytic CO 2 reduction [5,[26][27][28][29]. The production yield of highly dispersed titanium oxide catalysts (in mol/g-Ti/h), was increased 10-300 times as compared to crystalline TiO 2 .…”

Section: Photocatalytic Co 2 Reductionmentioning

confidence: 99%

Functioning devices for solar to fuel conversion

Mul¹,

Schacht²,

Swaaij³

et al. 2012

Chemical Engineering and Processing: Process Intensification

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a b s t r a c tThis paper provides a perspective on the technologies capable of converting solar energy, CO 2 and H 2 O into an easy to use fuel. The paper addresses bio-based approaches, but mainly focuses on (i) the combination of photovoltaic (PV) devices and electrocatalysis, (ii) single unit operation by photocatalytic conversion, and (iii) solar thermal conversion. Each option is described in a general manner, including a brief evaluation of the advantages and disadvantages. Also suggestions for future research endeavours are given. Based on the used literature data, for electrocatalytic and photocatalytic technologies, dramatic improvements should be made in material optimization, as well as reactor design and operation. Large efficiency gains are necessary to enable use of these technologies in practice. Solar thermal conversion is more mature, and requires specific optimization in processing, as will be discussed.

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Selective formation of CH3OH in the photocatalytic reduction of CO2 with H2O on titanium oxides highly dispersed within zeolites and mesoporous molecular sieves

Cited by 245 publications

References 11 publications

CO2 Sequestration and Recycle by Photosynthesis

CO2 Sequestration and Recycle by Photosynthesis

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

Functioning devices for solar to fuel conversion

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