Preparation of ternary Cr2O3–SiC–TiO2 composites for the photocatalytic production of hydrogen

Zhang, Yaojun; Xu, Yong; Li, Tuo; Wang, Yachao

doi:10.1016/j.partic.2011.08.001

Cited by 21 publications

(9 citation statements)

References 22 publications

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“…Zhang et al in 2012 reported a ternary system by coupling SiC with a large band gap semiconductor (TiO 2 ) and Cr 3+ species in order to extend the material optical response range. 613 The authors demonstrated that the ternary Cr 2 O 3 − SiC-TiO 2 composites underwent a red-shift of absorption edges with increasing Cr 3+ levels thus enhancing the separation efficiency of photogenerated carriers and ultimately improving H 2 production under visible light. A year later, other multicomponent photocatalytic systems with SiC as a key promoter for water splitting reaction were developed by the Li team.…”

Section: Photochemical Processesmentioning

confidence: 99%

Porous Silicon Carbide (SiC): A Chance for Improving Catalysts or Just Another Active-Phase Carrier?

et al. 2021

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There is an obvious gap between efforts dedicated to the control of chemicophysical and morphological properties of catalyst active phases and the attention paid to the search of new materials to be employed as functional carriers in the upgrading of heterogeneous catalysts. Economic constraints and common habits in preparing heterogeneous catalysts have narrowed the selection of active-phase carriers to a handful of materials: oxide-based ceramics (e.g. Al2O3, SiO2, TiO2, and aluminosilicates–zeolites) and carbon. However, these carriers occasionally face chemicophysical constraints that limit their application in catalysis. For instance, oxides are easily corroded by acids or bases, and carbon is not resistant to oxidation. Therefore, these carriers cannot be recycled. Moreover, the poor thermal conductivity of metal oxide carriers often translates into permanent alterations of the catalyst active sites (i.e. metal active-phase sintering) that compromise the catalyst performance and its lifetime on run. Therefore, the development of new carriers for the design and synthesis of advanced functional catalytic materials and processes is an urgent priority for the heterogeneous catalysis of the future. Silicon carbide (SiC) is a non-oxide semiconductor with unique chemicophysical properties that make it highly attractive in several branches of catalysis. Accordingly, the past decade has witnessed a large increase of reports dedicated to the design of SiC-based catalysts, also in light of a steadily growing portfolio of porous SiC materials covering a wide range of well-controlled pore structure and surface properties. This review article provides a comprehensive overview on the synthesis and use of macro/mesoporous SiC materials in catalysis, stressing their unique features for the design of efficient, cost-effective, and easy to scale-up heterogeneous catalysts, outlining their success where other and more classical oxide-based supports failed. All applications of SiC in catalysis will be reviewed from the perspective of a given chemical reaction, highlighting all improvements rising from the use of SiC in terms of activity, selectivity, and process sustainability. We feel that the experienced viewpoint of SiC-based catalyst producers and end users (these authors) and their critical presentation of a comprehensive overview on the applications of SiC in catalysis will help the readership to create its own opinion on the central role of SiC for the future of heterogeneous catalysis.

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Section: Photochemical Processesmentioning

confidence: 99%

Porous Silicon Carbide (SiC): A Chance for Improving Catalysts or Just Another Active-Phase Carrier?

et al. 2021

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“…TiO 2 has been extensively studied to support the future hydrogen economy due to its high catalytic activity, long-term photostability, strong oxidizing power, abundant availability, and environmentally friendly nature (Kokporka, Onsuratoom, Puangpetch, & Chavadej, 2013;Zhang, Xu, Li, & Wang, 2012). However, it can be activated only under UV light irradiation (i.e.…”

Section: Introductionmentioning

confidence: 99%

CuO@TiO2 and NiO@TiO2 core-shell catalysts for hydrogen production from the photocatalytic reforming of glycerol aqueous solution

Ramirez

Wang

Valenzuela

et al. 2020

JART

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Hydrogen production from the photocatalytic reforming of glycerol aqueous solution was performed on the CuO@TiO2, NiO@TiO2, NiO@CuO, and CuO@NiO core-shell nanostructured catalysts under simulated solar light irradiation. These catalysts were prepared by the combination of a modified sol-gel and a precipitation-deposition method using hydroxypropyl cellulose as structural linker and they were characterized by powder X-ray diffraction (XRD), UV-Vis diffuse reflectance spectroscopy (UV–Vis DRS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and nitrogen physisorption isotherms techniques. The catalysts containing TiO2 as a shell and CuO as core showed much higher activity compared with those formulated with NiO@CuO, CuO@NiO, and bared CuO or NiO nanoparticles. The highest rate of hydrogen production obtained with the CuO@TiO2 catalyst was as high as 153.8 μmol·g−1h-1, which was 29.0, 24.8, 11.2 and 3.2 times greater than that obtained on CuO@NiO, NiO@CuO, TiO2 P25, and NiO@TiO2 catalyst, respectively. For the high active CuO@TiO2 catalyst, after activation of TiO2 with solar light irradiation, the conduction band electrons can be transferred to CuO core through the heterojunction in the core-shell interfaces which led to CuO gradually reduced to Cu2O, favoring the reduction of proton to release hydrogen.

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“…TiO 2 has a large band gap (3.2 eV) and a rapid electron‐hole recombination rate, which lead to a significant decrease in photocatalytic efficiency, and many efforts have been made by modifying TiO 2 to achieve a high photocatalytic efficiency 23–29. Nevertheless, the performance of a PM with modified TiO 2 coating has rarely been reported 22, 30.…”

Section: Introductionmentioning

confidence: 99%

Performance of a Metal Ion‐Doped Titania‐Coated Planar Photocatalytic Microreactor

2015

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A novel planar photocatalytic microreactor coated with metal ion-doped TiO 2 was fabricated by chemical etching and sol-gel techniques. The photocatalytic activity of the microreactor was evaluated by studying the degradation of methylene blue (MB) under ultraviolet light, visible light, and sunlight, and encouraging results were obtained. Analyses of the degradation products indicate that demethylation and ring-opening reactions took place and that the mineralization of MB is a slow process. Kinetic studies of the MB degradation show that metal ion doping increases the reaction order. Comparing the applied microreactor with other conventional microchannel photocatalytic reactors, nearly the same degradation ratios and relatively higher degradation rates per unit reaction volume were obtained.

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Preparation of ternary Cr2O3–SiC–TiO2 composites for the photocatalytic production of hydrogen

Cited by 21 publications

References 22 publications

Porous Silicon Carbide (SiC): A Chance for Improving Catalysts or Just Another Active-Phase Carrier?

Porous Silicon Carbide (SiC): A Chance for Improving Catalysts or Just Another Active-Phase Carrier?

CuO@TiO2 and NiO@TiO2 core-shell catalysts for hydrogen production from the photocatalytic reforming of glycerol aqueous solution

Performance of a Metal Ion‐Doped Titania‐Coated Planar Photocatalytic Microreactor

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