Au–Cu on Nb2O5 and Nb/MCF supports – Surface properties and catalytic activity in glycerol and methanol oxidation

Sobczak, Izabela; Wolski, Łukasz

doi:10.1016/j.cattod.2014.10.051

Cited by 46 publications

(21 citation statements)

References 80 publications

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“…Sobczak et al. reported Au (or Au‐Cu) on Nb 2 O 5 and Nb/MCF (silica) supports by modification of the niobium oxide surface by an amino group . Tong et al.…”

Section: Co Oxidation On Au/nb2o5 Catalysts[a] Prepared By the Dr Metmentioning

confidence: 99%

“…Sobczak et al reported Au (or Au-Cu) on Nb 2 O 5 and Nb/MCF (silica) supports by modificationo ft he niobium oxide surface by an amino group. [16,17] Tong et al and Ko et al reported as imple Au/Nb 2 O 5 catalyst;h owever,t he mean diameter of the Au particles was larger than 5nm. [18,19] As far as we know, this is the first report on highly active NPGCs (smaller than 5nm) supported on Nb 2 O 5 .…”

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confidence: 99%

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Deposition of Gold Nanoparticles on Niobium Pentoxide with Different Crystal Structures for Room‐Temperature Carbon Monoxide Oxidation

2016

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Nanoparticulate gold catalysts (NPGCs) supported on niobium oxides (Nb2O5) were prepared by different deposition methods. Au nanoparticles (NPs) with a mean diameter of approximately 5 nm were deposited by conventional deposition methods, which include the deposition‐precipitation (DP) and deposition‐reduction (DR) methods, on layered‐type Nb2O5 that possesses a deformed orthorhombic structure. Moreover, Au NPs with a mean diameter of approximately 2.7 nm could be deposited by the sol immobilization method on several crystalline forms of Nb2O5 (deformed orthorhombic, pseudohexagonal, and orthorhombic). NPGCs deposited on deformed orthorhombic Nb2O5 had a higher catalytic activity for CO oxidation. The temperature for 50 % CO conversion was 11 °C for 1 wt % Au/Nb2O5 (deformed orthorhombic) prepared by the sol immobilization method, and the CO conversion was 91 % at 28 °C. As far as we know, this is the first report of highly active Au NPGCs (smaller than 3 nm in diameter) supported on Nb2O5. NPGCs supported on acidic metal oxides will expand the utilization of gold catalysts for new applications.

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“…Sobczak et al. reported Au (or Au‐Cu) on Nb 2 O 5 and Nb/MCF (silica) supports by modification of the niobium oxide surface by an amino group . Tong et al.…”

Section: Co Oxidation On Au/nb2o5 Catalysts[a] Prepared By the Dr Metmentioning

confidence: 99%

mentioning

confidence: 99%

Deposition of Gold Nanoparticles on Niobium Pentoxide with Different Crystal Structures for Room‐Temperature Carbon Monoxide Oxidation

2016

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“…oxidation of carbon monoxide, [1][2][3][4][5][6][7] methanol, [8][9][10][11] and other alcohols. [12][13][14][15][16][17][18] In the case of gold catalysts, metallic gold on the surface of catalysts promotes oxidative properties by leading to higher mobility of oxygen and to a much easier reduction of the copper species. 19 The transfer of electrons is difficult on a metallic gold surface; however, copper has a greater electron-donating ability and it can modify the electronic and structural properties of gold.…”

Section: Introductionmentioning

confidence: 99%

“…This nding indicates that the existence of reducible copper species in copper-gold catalysts is responsible for enhanced core-hole shielding. 12 The species characterized by BE below 83 eV were interpreted by some authors as negatively charged gold on different supports, e.g. ref.…”

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confidence: 99%

Mesoporous cerium–zirconium oxides modified with gold and copper – synthesis, characterization and performance in selective oxidation of glycerol

2017

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“…Furthermore, noble metal/Cu alloys are also reported as active catalysts for the selective oxidation of glycerol. [34][35][36] Despite the variety of possible noble metal catalysts, more abundant and cost-efficient catalysts are highly desirable. An attractive alternative to noble metals in selective oxidation reactions is copper, which was demonstrated to be active for the selective oxidation of various alcohols and polyols.…”

Section: Introductionmentioning

confidence: 99%

Selective glycerol oxidation over ordered mesoporous copper aluminum oxide catalysts

Schünemann

Tüysüz

2017

Catal. Sci. Technol.

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Glycerol is a major by-product of the biodiesel production and is therefore produced in high quantities. While currently there are limited possible applications for this highly functionalized molecule, glycerol can be a cheap and abundant feedstock for value-added products that are accessible by selective oxidation.Usually, the selective oxidation of glycerol utilizes expensive noble metal catalysts, such as Au, Pt, and Pd. Here we report the selective oxidation of glycerol in basic media, using ordered mesoporous Cu-Al 2 O 3 catalysts with various Cu loadings prepared by a facile soft-templating method. The materials were characterized in detail by nitrogen physisorption, vis-NIR spectroscopy, EDX, low-and wide-angle XRD, XPS, and TEM. Subsequently the reaction conditions for glycerol oxidation were optimized. The catalytic oxidation of glycerol yields C 3 products, such as glyceric acid and tartronic acid, and also C 2 and C 1 products, such as glycolic acid, oxalic acid, and formic acid. Moreover, the role of the solvent on the catalytic reaction was investigated, and the addition of various co-solvents to the aqueous reaction mixture was found to increase the initial reaction rate up to a factor of three. The trends of the initial reaction rates correlate well with the polarity of the water/co-solvent mixtures. The prepared Cu-Al 2 O 3 catalysts are a more costefficient and environmentally viable alternative to the reported noble metal catalysts.

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Au–Cu on Nb2O5 and Nb/MCF supports – Surface properties and catalytic activity in glycerol and methanol oxidation

Cited by 46 publications

References 80 publications

Deposition of Gold Nanoparticles on Niobium Pentoxide with Different Crystal Structures for Room‐Temperature Carbon Monoxide Oxidation

Deposition of Gold Nanoparticles on Niobium Pentoxide with Different Crystal Structures for Room‐Temperature Carbon Monoxide Oxidation

Mesoporous cerium–zirconium oxides modified with gold and copper – synthesis, characterization and performance in selective oxidation of glycerol

Selective glycerol oxidation over ordered mesoporous copper aluminum oxide catalysts

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