Maximizing Activity and Stability by Turning Gold Catalysis Upside Down: Oxide Particles on Nanoporous Gold

Wichmann, Andre; Wittstock, Arne; Frank, Kristian; Biener, Monika M.; Neumann, Björn; Mädler, Lutz; Biener, J.; Rosenauer, A.; Bäumer, Marcus

doi:10.1002/cctc.201200759

Cited by 38 publications

(43 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…After submersing npAu in TTIP and hydrolysis in air, calcination at 400°C in helium leads to finely dispersed coatings of TiO 2 across the whole cross section of a 300 μm npAu membrane. 143 In line with previous experiments on the catalytic oxidation of CO, the activity of the composite material was enhanced as compared with the pure npAu sample ( Figure 13). In addition to the amplified activity, the composite material also showed improved resistivity to temperature-induced coarsening.…”

Section: Acs Catalysissupporting

confidence: 91%

Nanoporous Gold as a Platform for a Building Block Catalyst

2012

Self Cite

View full text Add to dashboard Cite

Porous bulk materials are of great interest in catalysis because they can be employed in heterogeneous gas and liquid phase catalysis, electrocatalysis, and in electrocatalytic sensing. Nanoporous gold gained considerable attraction in this context because it is the prime example of a corrosion-derived nanoporous bulk metal. The material was shown to be a very active and selective Au type catalyst for a variety of oxidation reactions. By leveraging the functionalization of the surface of the material with various additives, its catalytic applications can be extended and tuned. In this review, we will summarize recent developments in using nanoporous gold as the platform for the development of high performance catalytic materials by adding metals, metal oxides, and molecular functionalities as building blocks.

show abstract

Section: Acs Catalysissupporting

confidence: 91%

Nanoporous Gold as a Platform for a Building Block Catalyst

2012

Self Cite

View full text Add to dashboard Cite

show abstract

“…Among these phases, anatase is reported to be the most beneficial with respect to catalytic activity . Figure A shows a high resolution TEM image of TiO 2 ‐coated gold rods with annealing at 450 °C for 2 h. The anatase crystalline phase of TiO 2 was confirmed by the lattice fringe distance of about 0.355 nm, which is in good agreement with literature . Figure B is the XRD pattern of individual TiO 2 power prepared with the same condition to that of TiO 2 ‐coated gold rods.…”

Section: Resultssupporting

confidence: 83%

Hierarchically Templated Synthesis of Hollow Nanoporous Gold Rods and TiO₂‐Coated Gold Rods

Gao

Liang

et al. 2016

ChemNanoMat

View full text Add to dashboard Cite

Gold nanomaterials have shown promising applications in catalysis and sensing. Among the current directions in the research and development of gold catalysts, the exploration of new forms is one of the major priorities. Using bacteria as the supporting template and polystyrene spheres as the pore‐generation template, a hierarchical‐template synthesis strategy was developed in the present study to synthesize hollow nanoporous gold rods. The pore size can be easily adjusted by using polystyrene spheres (PSS) with different diameters as the template (the pore size is about 160 nm and 70 nm when using 200 nm and 110 nm PSS, respectively, as the template). Moreover, with the simple sol–gel method, different amounts of TiO2 can be coated on these nanoporous gold rods. The results showed the thermal stability and catalytic activity of the nanoporous gold rods were improved dramatically with moderate TiO2 coating. Using reduction of 4‐nitrophenol to 4‐aminophenol with sodium borohydride as the model reaction, excellent catalytic properties (reaction rate constant k=0.246 min−1) of the prepared TiO2‐coated gold rods catalysts were confirmed.

show abstract

“…Based on this finding, Shi et al attempted the WGS reaction with NPG films decorated with ceria. Decorating NPG structure with metal oxide particles not only enhances catalytic activity, but also structural stability, which improves at high temperatures without coarsening of the nanopores and ligaments [7]. This structural stability is essential for the reaction because in this reaction, water molecules, not oxygen molecules, are used as an oxidant.…”

Section: Hydrogen Oxidation and Productionmentioning

confidence: 99%

“…However, it was one of the intrinsic problems that immobilized gold nanoparticles were being detached from the support during reaction and it caused degradation of the catalytic activity of gold nanoparticle-supported composite catalyst. NPG plays a role in this aspect as it is a one-body film and there was no concern regarding the loss of catalyst materials [7]. Consequently, the catalytic activity of the NPG films drew considerable attention from the late 1990s.…”

mentioning

confidence: 99%

Nanoporous Gold Films as Catalyst

Kim¹

2016

Catalytic Application of Nano-Gold Catalysts

View full text Add to dashboard Cite

Nanoporous gold (NPG) is reviewed as a catalyst. Various preparation methods were first reviewed for NPG and its structure. Applications of this catalyst in CO oxidation, hydrogen oxidation, hydrogen production are discussed. Regarding CO oxidation, detailed studies on reaction mechanism and density functional theory (DFT) calculations were also reviewed. Not only as a model reaction but also practical aspects of removing CO residue in hydrogen stream are discussed. Beyond those simple reactions, the application of NPG to more complicated reactions such as alcohol oxidation is reviewed. Selective aerobic oxidation of gas-phase alcohols is first reviewed and reactions in liquid phase are discussed. Finally, future prospects of NPG as a catalyst for more complicated reactions such as organic synthesis are briefly discussed.

show abstract

Maximizing Activity and Stability by Turning Gold Catalysis Upside Down: Oxide Particles on Nanoporous Gold

Abstract: Oxidation catalysis by Au spurred intensive research efforts during the last two decades. It is the intense interaction of gold and an oxide material which brings about the catalytic activity, in particular at the perimeter between both partners. The

Cited by 38 publications

References 48 publications

Nanoporous Gold as a Platform for a Building Block Catalyst

Nanoporous Gold as a Platform for a Building Block Catalyst

Hierarchically Templated Synthesis of Hollow Nanoporous Gold Rods and TiO₂‐Coated Gold Rods

Nanoporous Gold Films as Catalyst

Contact Info

Product

Resources

About

Maximizing Activity and Stability by Turning Gold Catalysis Upside Down: Oxide Particles on Nanoporous Gold

Abstract: Oxidation catalysis by Au spurred intensive research efforts during the last two decades. It is the intense interaction of gold and an oxide material which brings about the catalytic activity, in particular at the perimeter between both partners. The

Cited by 38 publications

References 48 publications

Nanoporous Gold as a Platform for a Building Block Catalyst

Nanoporous Gold as a Platform for a Building Block Catalyst

Hierarchically Templated Synthesis of Hollow Nanoporous Gold Rods and TiO2‐Coated Gold Rods

Nanoporous Gold Films as Catalyst

Contact Info

Product

Resources

About

Hierarchically Templated Synthesis of Hollow Nanoporous Gold Rods and TiO₂‐Coated Gold Rods