Exploration of the preparation of Cu/TiO2 catalysts by deposition–precipitation with urea for selective hydrogenation of unsaturated hydrocarbons

Wang, Zhao; Brouri, Dalil; Casale, Sandra; Delannoy, Laurent; Louis, Catherine

doi:10.1016/j.jcat.2016.05.011

Cited by 48 publications

(43 citation statements)

References 53 publications

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“…The authors, in fact, stated that the catalyst was able to partially hydrogenate 1,3-butadiene at temperatures as low as 60 °C. 46 The lower Cu-based activity for the catalysts supported on SiO 2 and carbon, compared to TiO 2 , may be caused by the presence of support effects for small nanoparticles on reducible metal oxide supports. For example, Masoud et al reported a 4-fold higher activity for <5 nm Au nanoparticles supported on TiO 2 compared to Au/SiO 2 .…”

Section: Results and Discussionmentioning

confidence: 99%

Supported Cu Nanoparticles as Selective and Stable Catalysts for the Gas Phase Hydrogenation of 1,3-Butadiene in Alkene-Rich Feeds

et al. 2020

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Supported copper nanoparticles are a promising alternative to supported noble metal catalysts, in particular for the selective gas phase hydrogenation of polyunsaturated molecules. In this article, the catalytic performance of copper nanoparticles (3 and 7 nm) supported on either silica gel or graphitic carbon is discussed in the selective hydrogenation of 1,3-butadiene in the presence of a 100-fold excess of propene. We demonstrate that the routinely used temperature ramp-up method is not suitable in this case to reliably measure catalyst activity, and we present an alternative measurement method. The catalysts exhibited selectivity to butenes as high as 99% at nearly complete 1,3-butadiene conversion (95%). Kinetic analysis showed that the high selectivity can be explained by considering H 2 activation as the rate-limiting step and the occurrence of a strong adsorption of 1,3-butadiene with respect to mono-olefins on the Cu surface. The 7 nm Cu nanoparticles on SiO 2 were found to be a very stable catalyst, with almost full retention of its initial activity over 60 h of time on stream at 140 °C. This remarkable long-term stability and high selectivity toward alkenes indicate that Cu nanoparticles are a promising alternative to replace precious-metal-based catalysts in selective hydrogenation.

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Section: Results and Discussionmentioning

confidence: 99%

Supported Cu Nanoparticles as Selective and Stable Catalysts for the Gas Phase Hydrogenation of 1,3-Butadiene in Alkene-Rich Feeds

et al. 2020

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“…Predominantly, Cu2O has been reported as the active species in reducing electron-hole pair recombination and as an active site for multi-electron transfers. Wang et al have shown that Cu-TiO2 nanomaterials, produced by the reaction of Cu(I) salts, photoreduced to Cu(0) and re-oxidized in ambient conditions, can work as stable photocatalysts if the formation of the CuO is avoided [26]. Theoretical investigations have shown that the presence of low coordinated Cu on the surface can induce a shift in the valence band edge mainly via the subband gap states of Cu 3d [27].…”

Section: Have Shown Thatmentioning

confidence: 99%

Surface modification of TiO2 with copper clusters for band gap narrowing

et al. 2019

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Research highlights  Successful computational design to discover new photocatalytic materials that may be useful for solar applications  CuO & CuOx molecular cluster modified TiO2 photocatalysts where investigated by DFT modelling  Modelling predicted Cu states within the band gap of TiO2 for both CuO & CuOx surface modifying molecular clusters  Physical Characterisation of the CuOx modified TiO2 showed a red shift in optical adsorption and valence band XPS.  Photoelectrochemical characterisation, showed an increase and a small red shift in the IPCE for CuOx modified TiO2 compared to TiO2.

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“…The optimum content of Cu composite TiO 2 nanorods was found to be 2%. When the number of copper particles of the surface of the TiO 2 nanorods increases, the photocatalytic activity of 4%‐Cu/TiO 2 nanorods decreases, which is due to the transfer of photoelectrons as a limiting step . The photocatalytic activity of the 2%‐Cu/TiO 2 nanorods was three times that of the pure TiO 2 nanorods.…”

Section: Resultsmentioning

confidence: 99%

Efficient and Robust Cu/TiO₂ Nanorod Photocatalysts for Simultaneous Removal of Cr(VI) and Methylene Blue under Solar Light

Guan

Zhou

Wen

et al. 2018

J Chinese Chemical Soc

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Because of its large bandgap, TiO 2 can function only under UV light. TiO 2 surface modification with noble metal nanoparticles can extend the light absorption from UV to visible light region and enhance the photocatalytic quantum yield. In this work, TiO 2 nanorods (Cu/TiO 2 ) modified by copper nanoparticles were prepared by a one-step solvothermal method at low cost. The resultant Cu/TiO 2 nanorods show excellent synergistic effect in the oxidation of methylene blue (MB) and the reduction of aqueous Cr(VI) under solar light irradiation. Mechanistic investigation suggests that the Cr(VI) species could effectively scavenge the electrons from MB in the presence of the asprepared photocatalyst, leading to the simultaneous removal of both pollutants. Being economically viable, environmentally sustainable, and highly efficient, the proposed photocatalyst holds promise for technologies involving simultaneous organic degradation and heavy metal removal in wastewater treatment.

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Exploration of the preparation of Cu/TiO2 catalysts by deposition–precipitation with urea for selective hydrogenation of unsaturated hydrocarbons

Cited by 48 publications

References 53 publications

Supported Cu Nanoparticles as Selective and Stable Catalysts for the Gas Phase Hydrogenation of 1,3-Butadiene in Alkene-Rich Feeds

Supported Cu Nanoparticles as Selective and Stable Catalysts for the Gas Phase Hydrogenation of 1,3-Butadiene in Alkene-Rich Feeds

Surface modification of TiO2 with copper clusters for band gap narrowing

Efficient and Robust Cu/TiO₂ Nanorod Photocatalysts for Simultaneous Removal of Cr(VI) and Methylene Blue under Solar Light

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Exploration of the preparation of Cu/TiO2 catalysts by deposition–precipitation with urea for selective hydrogenation of unsaturated hydrocarbons

Cited by 48 publications

References 53 publications

Supported Cu Nanoparticles as Selective and Stable Catalysts for the Gas Phase Hydrogenation of 1,3-Butadiene in Alkene-Rich Feeds

Supported Cu Nanoparticles as Selective and Stable Catalysts for the Gas Phase Hydrogenation of 1,3-Butadiene in Alkene-Rich Feeds

Surface modification of TiO2 with copper clusters for band gap narrowing

Efficient and Robust Cu/TiO2 Nanorod Photocatalysts for Simultaneous Removal of Cr(VI) and Methylene Blue under Solar Light

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Efficient and Robust Cu/TiO₂ Nanorod Photocatalysts for Simultaneous Removal of Cr(VI) and Methylene Blue under Solar Light