Controlling activity and selectivity using water in the Au-catalysed preferential oxidation of CO in H2

Lopez, Johnny Saavedra; Whittaker, Todd N.; Chen, Zhifeng; Pursell, Christopher J.; Rioux, Robert M.; Chandler, Bert D.

doi:10.1038/nchem.2494

Cited by 167 publications

(142 citation statements)

References 46 publications

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“…Currently,m any researchers pursuet he development of novel gold catalysts and investigate their applications toward the smallm olecule activation, targeted synthesis of complex systems, and the commercial production of fine chemicals. [17][18][19][20] In the alloy form with other metals, Au is used for the industrial production of vinyl acetate, [21] H 2 O 2 , [22,23] and polymethyl methacrylate, [24] andf or hydrodesulfurization and [25] redox reactions. Owing to its biocompatibility,A ui sc onsidered ag reen alternative to the hazardous metal catalysts used in petrochemical and automobile industries.…”

Section: Introductionmentioning

confidence: 99%

Gold‐Catalyzed Cross‐Coupling Reactions: An Overview of Design Strategies, Mechanistic Studies, and Applications

Nijamudheen

Datta

2019

Chemistry A European J

135

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Transition-metal-catalyzed cross-couplingr eactions are central to many organic synthesis methodologies. Traditionally,P d, Ni, Cu, and Fe catalysts are used to promote these reactions. Recently,m any studies have showedt hat both homogeneous and heterogeneous Au catalysts can be used for activating selective cross-coupling reactions.H ere, an overview of the past studies, current trends, andf uture directions in the field of gold-catalyzed coupling reactions is presented.D esign strategiest oa ccomplish selective homocoupling and cross-coupling reactions under both homogeneous and heterogeneous conditions, computational and ex-perimental mechanistic studies, and their applicationsi nd iverse fields are critically reviewed. Specific topics covered are:o xidant-assisted and oxidant-free reactions;s train-assisted reactions;d ual Au and photoredoxc atalysis;b imetallic synergistic reactions;m echanismso fr eductivee limination processes;e nzyme-mimicking Au chemistry;c lustera nd surface reactions;a nd plasmonic catalysis. In the relevant sections, theoretical and computational studies of Au I /Au III chemistry are discussed and the predictionsf rom the calculationsa re compared with the experimental observations to derive useful design strategies.A. Nijamudheen earnedh is PhD from IACS, Kolkata,i n2 015. Currently,h ei sapostdoctoral researcher atF loridaS tate University.H is researchi nterests are in computational catalysis, solar energym aterials, and beyond Li-ion battery technologies.Ayan Dattai sc urrently aP rofessor at IACS, Kolkata.H is research interests include theoretical and computational studieso ft ransitionmetal-catalyzed reactions,o pto-electronic properties of organic and solid-statem aterials, and the design of renewableenergymaterials. He has won several awards including the DST-SERB Distinguished Investigator Award (DIA) in 2019.

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Section: Introductionmentioning

confidence: 99%

Gold‐Catalyzed Cross‐Coupling Reactions: An Overview of Design Strategies, Mechanistic Studies, and Applications

Nijamudheen

Datta

2019

Chemistry A European J

135

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“…Nowadays, the hydrogen production worldwide is mainly employed in the ammonia synthesis reaction and there is an increasing interest as a clean combustible option for fuel cell technology [1]. Steam reforming of natural gas or the light oil fraction coupled with water gas shift reaction is the most widely used process to produce a H 2 -rich gas mixture known as a reformate gas, which contains 15-20 vol% CO 2 , 10 vol% H 2 O, and ~ 1 vol% (10,000 ppm) of carbon monoxide (CO) [1,2]. However, the catalysts used in the ammonia production and low-temperature fuel cell devices are very sensitive to CO.…”

Section: Introductionmentioning

confidence: 99%

Active Pt/CeO2 catalysts prepared by an alcohol-reduction process for low-temperature CO-PROX reaction

Queiroz

Machado

Paiva

et al. 2019

Mater Renew Sustain Energy

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Pt/CeO 2 catalysts were prepared with 0.5 and 1 wt% of Pt loadings by an alcohol-reduction process using a solution of ethylene glycol and water as a reducing agent and solvent. The obtained catalysts were characterized by energy-dispersive X-ray spectroscopy, X-ray diffraction, and transmission electron microscopy. Transmission electron micrographs showed Pt nanoparticles with average sizes of 2.2 and 2.4 nm for Pt content of 0.5 and 1 wt%, respectively. The preferential oxidation of carbon monoxide in hydrogen-rich stream (CO-PROX reaction) was studied in the temperature range of 25-150 °C. Pt/CeO 2 catalysts showed maximum CO conversions in the range of 80-98% and CO 2 selectivity in the range of 50-70% at 50 °C.

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“…The preferential oxidation of CO with oxygen in hydrogen-rich gas mixtures (CO-PROX reaction) has been considered a very promising process, as it can drastically reduce energy and hydrogen losses. However, the main challenge in this process is the developments of catalysts that achieves a high CO conversions and CO 2 selectivities and not convert H 2 to H 2 O 1,3 . The preparation of Au nanoparticles supported in TiO 2 (Au/TiO 2 catalysts) have been described by different methods 4 and it is well known that the particle size of Au nanoparticles enormously affects the catalytic activity of supported Au catalysts in many reactions 5 .…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, the catalysts used in the ammonia production process and in the low temperature fuel cells are very sensitive to CO contamination and, therefore, the hydrogen from these processes must be purified (below 10 ppm CO). The main methods currently used to remove CO from the hydrogen-rich gas mixture are pressure swing adsorption which requires high investment in infrastructure and the CO methanation process which causes significant losses of the hydrogen produced by non-selective methanation of CO 2 present in the reformate gas 1 . The preferential oxidation of CO with oxygen in hydrogen-rich gas mixtures (CO-PROX reaction) has been considered a very promising process, as it can drastically reduce energy and hydrogen losses.…”

Section: Introductionmentioning

confidence: 99%

“…Currently most of this hydrogen produced in the world is used in the manufacture of ammonia for use in fertilizers 1 and lately, there is also a great interest in the use of hydrogen in low temperature fuel cells 2 . On the other hand, the catalysts used in the ammonia production process and in the low temperature fuel cells are very sensitive to CO contamination and, therefore, the hydrogen from these processes must be purified (below 10 ppm CO).…”

Section: Introductionmentioning

confidence: 99%

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Preparation of Au/TiO2 Catalyst by a Liquid-Phase Reduction Method for Preferential Oxidation of Carbon Monoxide in a Hydrogen Rich-Stream (CO-PROX reaction)

Pereira¹,

Ciotti²,

Vaz³

et al. 2017

Mat. Res.

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Au nanoparticles supported on TiO 2 were prepared by a liquid-phase reduction method using HAuCl 4 .3H 2 O as the Au precursor, TiO 2 as the support, a solution of ethylene glycol/water as solvent and reducing agent and sodium citrate as reducing agent and stabilizer. The Au/TiO 2 catalysts were prepared using different routes and characterized by Energy-dispersive X-ray spectroscopy, X-ray diffraction and Transmission Electron Microscopy and tested for preferential oxidation of carbon monoxide in hydrogen-rich stream (CO-PROX reaction). The way that the Au precursor, the TiO 2 support and the sodium citrate is added to the ethylene glycol/water solution strongly influences the Au nanoparticle sizes and the catalytic activity of the obtained materials.

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Controlling activity and selectivity using water in the Au-catalysed preferential oxidation of CO in H2

Cited by 167 publications

References 46 publications

Gold‐Catalyzed Cross‐Coupling Reactions: An Overview of Design Strategies, Mechanistic Studies, and Applications

Gold‐Catalyzed Cross‐Coupling Reactions: An Overview of Design Strategies, Mechanistic Studies, and Applications

Active Pt/CeO2 catalysts prepared by an alcohol-reduction process for low-temperature CO-PROX reaction

Preparation of Au/TiO2 Catalyst by a Liquid-Phase Reduction Method for Preferential Oxidation of Carbon Monoxide in a Hydrogen Rich-Stream (CO-PROX reaction)

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