Mesoporous TiO2/SBA-15, and Cu/TiO2/SBA-15 Composite Photocatalysts for Photoreduction of CO2 to Methanol

Yang, Hsien-Chang; Lin, Hsin‐Yu; Chien, Yu-Shiang; Wu, Jeffrey C.S.; Wu, Han Chieh

doi:10.1007/s10562-009-0076-y

Cited by 129 publications

(41 citation statements)

References 23 publications

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“…The formation of CH 3 OH was more efficient than that of CH 4 in the presence of Cu/TiO 2 catalysts prepared by impregnation of a TiO 2 powder with CuCl 2 ·2H 2 O [21]. An increased methanol yield was also obtained loading silica supported TiO 2 powders with copper [9,13] or by impregnating Degussa P25 with copper nitrate [12]. The addition of Cu species, markedly increased the overall CO 2 conversion efficiency as well as the selectivity to CH 4 [13].…”

Section: Introductionmentioning

confidence: 95%

“…The photocatalytic reduction of CO 2 on TiO 2 has been studied in aqueous solutions [4,[6][7][8][9][10][11][12][13], in liquid CO 2 [14] and in solid-gas systems [15][16][17][18]. The efficiency of the conversion of CO 2 to fuels in aqueous suspension systems was very low when H 2 O was used as the reductant but higher yields of products were obtained in the presence of molecules acting as hole sacrificial scavengers.…”

Section: Introductionmentioning

confidence: 99%

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Photocatalytic CO2 Reduction in Gas-Solid Regime in the Presence of Bare, SiO2 Supported or Cu-Loaded TiO2 Samples

Bellardita¹,

Paola²,

García‐López³

et al. 2013

COC

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Both commercial and home prepared (HP) TiO2 samples have been tested for the photocatalytic reduction of CO2. (HP) TiO2 powders were prepared by using TiCl4 or Ti(OC4H9)4 as the precursors to obtain HP1 and HP2 samples, respectively. Also HP Cu-loaded and SiO2 supported TiO2 powders were prepared. The HP samples were more active than the commercial ones for the photoreduction of CO2 with and without water vapour. HP1 produced mainly formaldehyde, HP2 principally methane. Acetaldehyde was found to be the primary product obtained when HP1 was supported on SiO2. The addition of Cu increased the photocatalytic reactivity either of bulk and SiO2-supported HP1. In particular, 1 wt % of Cu improved the formaldehyde yield obtained with the bare HP1 by one order of magnitude. Differently, the presence of Cu or SiO2 in the HP2 samples markedly reduced the production of methane.

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Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Photocatalytic CO2 Reduction in Gas-Solid Regime in the Presence of Bare, SiO2 Supported or Cu-Loaded TiO2 Samples

Bellardita¹,

Paola²,

García‐López³

et al. 2013

COC

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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%

“…However, higher Cu loading gave a lower rate of methanol yield because of the masking effect of Cu 2 O clusters on the TiO 2 surface [132,133]. Consequently, it is generally believed that CO 2 can be selectively reduced to methanol in an aqueous solution under light irradiation due to the Cu 2 O or CuO species on the TiO 2 surface [54,55,131,133,218,308,328].…”

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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“…As photocatalysts, mesoporous materials have a number of advantages, including: (1) a high value of specific surface area and nanometer pore size; (2) prolonged substrate retention; (3) migration of photogenerated charge carriers through the adjacent semiconductor nanoparticles, and an accumulation at their points of contact, and (4) high possibility of repeat light reflectance encouraging a greater absorption of light [9]. The benefits of these mesoporous structures are illustrated by the titania nanophotocatalysts in the photocatalytic oxidation of dyes [10], oxidative disruption of the cell membranes of E. coli bacteria [11] and carbon dioxide reduction to methanol [12], among others. Specifically, mesoporous ZnO [13], CeO2 [14] and Co3O4 [15] have all exhibited high photocatalytic activity in the destruction of dyes when compared with non-porous nanopowders.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Properties of Nb/MCM-41 Molecular Sieves: Effect of the Synthesis Conditions

Gómez

Páez

2015

Coatings

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Abstract:The effect of synthesis conditions and niobium incorporation levels on the photocatalytic properties of Nb/MCM-41 molecular sieves was assessed. Niobium pentoxide supported on MCM-41 mesoporous silica was obtained using two methods: sol-gel and incipient impregnation, in each case also varying the percentage of niobium incorporation. The synthesized Nb-MCM-41 ceramic powders were characterized using the spectroscopic techniques of infrared spectroscopy (IR), Raman spectroscopy, X-ray diffraction (XRD), and transmission electron microscopy (TEM). The photodegradation capacity of the powders was studied using the organic molecule, methylene blue. The effect of both the method of synthesis and the percentage of niobium present in the sample on the photodegradation action of the solids was determined. The mesoporous Nb-MCM-41 that produced the greatest photodegradation response was obtained using the sol-gel method and 20% niobium incorporation.

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Mesoporous TiO2/SBA-15, and Cu/TiO2/SBA-15 Composite Photocatalysts for Photoreduction of CO2 to Methanol

Cited by 129 publications

References 23 publications

Photocatalytic CO2 Reduction in Gas-Solid Regime in the Presence of Bare, SiO2 Supported or Cu-Loaded TiO2 Samples

Photocatalytic CO2 Reduction in Gas-Solid Regime in the Presence of Bare, SiO2 Supported or Cu-Loaded TiO2 Samples

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

Photocatalytic Properties of Nb/MCM-41 Molecular Sieves: Effect of the Synthesis Conditions

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