TiO<sub>2</sub>Supported Nano-Au Catalysts Prepared Via Solvated Metal Atom Impregnation for Low–Temperature CO Oxidation

Wu, Shi-Hua; Zheng, Xiu-Cheng; Wang, Shurong; Han, Dongzhan; Huang, Wei‐Ping; Zhang, Shoumin

doi:10.1023/b:catl.0000029528.60669.cf

Cited by 18 publications

(3 citation statements)

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“…Typical reducing agents are H 2 [63] where strength of reduction is controlled by temperature [64,65] and NaBH 4 [66] which have strong reduction strength at room temperature Comparing Pt-CeO 2 /C and Pt-CeO 2/ C-1 in Fig. (7a, 7b) we can easily notice that, for 2400 rpm, Pt-CeO 2 /C had a higher current density value at 0.65V/RHE; -2.240 mAcm -2 than that of Pt-CeO 2 /C-1 that equals to-1.597 mAcm -2 , this could be related to the fact that, smaller particle sized electrocatalysts produced from using single reducing agent may tend to agglomerate and hence reduce the activity of the whole electrocatalysts, hence the oxide reduction extent in the preparation method affects the Pd and Au performance towards the ORR which is related to the catalyst synthesis procedures [67][68][69][70][71].…”

Section: Study Of Oxygen Reduction With Rdementioning

confidence: 99%

Preparation and Characterization of Nano Structured Pt−MOx/C for Oxygen Reduction Reaction in Acidic Medium

El–Khatib¹,

Fetohi

Amin

et al. 2017

Egypt. J. Chem.

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Pt-MOx/C (M = Ti, Ce or Zr) electrocatalysts was prepared for the purpose of developing a cheap and efficient electrocatalysts for oxygen reduction reaction (ORR) using a mixture of ethylene glycol and sodium borohydride (EG + NaBH 4 ) as areducing agent. Pt/C was studied for estimation of metal oxides effect.Pt-CeO 2 /C-1 was prepared through single reducing agent ethylene glycol for studying the effect of changing the reducing agent on the activity of electrocatalysts toward ORR and for studying ORR kinetics. The electrocatalytic activity of the prepared electrocatalysts towards (ORR) was evaluated by cyclic voltammetry (CV) and linear sweep voltammetry (LSV) on a rotating disc electrode (RDE). Pt-ZrO 2 /C shows the best activity towards ORR among the studied electrocatalysts; the oxygen reduction current density for it is about 5 times; (5.84 mAcm -2 ) as that of Pt/C (1.26 mAcm -2 ). Pt-CeO 2 /C showed better ORR activity (2.24 mAcm -2 ) than Pt-CeO 2 /C-1(1.58 mAcm -2 ) indicating the great effect of changing the reducing agent not only on the electrocatalyst behavior towards ORR but also its particle size and the metal content of the resultant electrocatalysts. Oxygen reduction mechanism for Pt-CeO 2 /C and Pt-CeO 2 /C-1 was evaluated using through KouteckyLevich, they showed first-order kinetics with ORR not controlled solely by diffusion. XRD, EDX and TEM analyses were used to characterize the prepared electrocatalyst.

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Section: Study Of Oxygen Reduction With Rdementioning

confidence: 99%

Preparation and Characterization of Nano Structured Pt−MOx/C for Oxygen Reduction Reaction in Acidic Medium

El–Khatib¹,

Fetohi

Amin

et al. 2017

Egypt. J. Chem.

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“…Extensive research has focused on the improvement of catalytic activity at low temperatures for these three co-current catalytic processes [32][33][34]. Numerous catalytic systems have been proposed including those based on Pt [35], Pd [36][37], Rh, Ru, Au [38][39][40][41][42][43], Ag, and Cu, supported on refractory or reducible carriers or dispersed in perovskites [44]. Due to the cost of the noble metals, much attention has been given to base metals as catalysts.…”

Section: Introductionmentioning

confidence: 99%

High Throughput Screening of Low Temperature CO Oxidation Catalysts Using IR Thermography

Cypes¹,

Hagemeyer²,

Hogan³

et al. 2007

CCHTS

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The catalytic oxidation of carbon monoxide to carbon dioxide is an important process used in several areas such as respiratory protection, industrial air purification, automotive emissions control, CO clean-up of flue gases and fuel cells. Research in this area has mainly focused on the improvement of catalytic activity at low temperatures. Numerous catalyst systems have been proposed, including those based on Pt, Pd, Rh, Ru, Au, Ag, and Cu, supported on refractory or reducible carriers or dispersed in perovskites. Well known commercial catalyst formulations for room temperature CO oxidation are based on CuMn2O4 (hopcalite) and CuCoAgMnOx mixed oxides. We have applied high-throughput and combinatorial methodologies to the discovery of more efficient catalysts for low temperature CO oxidation. The screening approach was based on a hierarchy of qualitative and semi-quantitative primary screens for the discovery of hits, and quantitative secondary screens for hit confirmation, lead optimization and scale-up. Parallel IR thermography was the primary screen, allowing one wafer-formatted library of 256 catalysts to be screened in approximately 1 hour. Multi-channel fixed bed reactors equipped with imaging reflection FTIR spectroscopy or GC were used for secondary screening. Novel RuCoCe compositions were discovered and optimized for CO oxidation and the effect of doping was investigated for supported and bulk mixed oxide catalysts. Another family of active hits that compare favorably with the Pt/Al2O3 benchmark is based on RuSn, where Sn can be used as a dopant (e.g. RuSn/SiO2) and/or as a high surface area carrier (e.g., SnO2 or Sn containing mixed metal oxides). Also, RuCu binary compositions were found to be active after a reduction pretreatment with hydrogen.

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“…Extensive research has focused on the improvement of catalytic activity at low temperatures for these three co-current catalytic processes [46][47][48]. Numerous catalytic systems have been proposed including those based on Pt [49], Pd [50,51], Rh, Ru, Au [52][53][54][55][56][57], Ag, and Cu, supported on refractory or reducible carriers or dispersed in perovskites [58]. Due to the cost of the noble metals, much attention has also been given to base metals and various transition metal oxides as catalysts.…”

Section: Introductionmentioning

confidence: 99%

High throughput discovery of CO oxidation/VOC combustion and water–gas shift catalysts for industrial multi-component streams

et al. 2006

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High-throughput and combinatorial approaches have been applied to the discovery of catalysts for selective low temperature CO oxidation/VOC removal using mixed CO/propylene feeds, and for the water-gas shift (WGS) reaction using real post-reformer feeds containing CO, CO 2 , H 2 O and H 2 . The screening approach was based on a hierarchy of qualitative and semi-quantitative primary screens for the discovery of hits, and quantitative secondary screens for hit confirmation, lead optimization and scale-up. For WGS, primary screening was carried out using scanning mass spectrometry. For CO oxidation and VOC removal, parallel IR thermography was the primary screen. Multi-channel fixed bed reactors equipped with imaging reflection FTIR spectroscopy or GC were used for secondary screening. Novel RuCoCe compositions were discovered and optimized for CO oxidation/VOC removal and the effect of doping was investigated for supported and bulk mixed oxide catalysts. For WGS, noble metal-free and Pt-doped CoFeRu mixed oxides as well as Pt on CeO 2 and Pt on CeO 2 /ZrO 2 were investigated and a new synergistic PtFeCe ternary composition was discovered. In these cases oxygen vacancies in the ceria lattice are believed to play a key role in the strong and synergistic Pt-Ce interaction. Alkaline metal doping was found to enhance the selectivity towards WGS by suppressing the unselective methanation side reaction and to increase the low temperature catalytic activity.

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TiO₂Supported Nano-Au Catalysts Prepared Via Solvated Metal Atom Impregnation for Low–Temperature CO Oxidation

Cited by 18 publications

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Preparation and Characterization of Nano Structured Pt−MOx/C for Oxygen Reduction Reaction in Acidic Medium

Preparation and Characterization of Nano Structured Pt−MOx/C for Oxygen Reduction Reaction in Acidic Medium

High Throughput Screening of Low Temperature CO Oxidation Catalysts Using IR Thermography

High throughput discovery of CO oxidation/VOC combustion and water–gas shift catalysts for industrial multi-component streams

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TiO2Supported Nano-Au Catalysts Prepared Via Solvated Metal Atom Impregnation for Low–Temperature CO Oxidation

Cited by 18 publications

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Preparation and Characterization of Nano Structured Pt−MOx/C for Oxygen Reduction Reaction in Acidic Medium

Preparation and Characterization of Nano Structured Pt−MOx/C for Oxygen Reduction Reaction in Acidic Medium

High Throughput Screening of Low Temperature CO Oxidation Catalysts Using IR Thermography

High throughput discovery of CO oxidation/VOC combustion and water–gas shift catalysts for industrial multi-component streams

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Product

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TiO₂Supported Nano-Au Catalysts Prepared Via Solvated Metal Atom Impregnation for Low–Temperature CO Oxidation