Supported Metal Catalysts: Preparation, Characterization, and Function

Jackson, S. David; Glanville, B.M.; Willis, J. B.; Mclellan, G.D.; Webb, G.; Moyes, R.B.; Simpson, Sydney; Wells, Peter B.; Whyman, Robin

doi:10.1006/jcat.1993.1018

Cited by 73 publications

(34 citation statements)

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“…In our opinion, this fact causes that in the case of platinum supported on oxides with which different compounds are easily formed, dispersion cannot be a parameter used to calculate the size of Pt crystallites. Moreover, it must be marked that carbon monoxide shows very high affinity only to the pure platinum [38] surface, therefore when it is not clean enough, adsorption of CO can be very low.…”

Section: Platinum Dispersionmentioning

confidence: 99%

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CO oxidation over Pt/SnO2 catalysts

Śmiechowicz

Kocemba

Rogowski

et al. 2018

Reac Kinet Mech Cat

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The influence of treatment conditions on Pt/SnO 2 properties and its catalytic activity in CO oxidation was investigated. It was found that the temperature and atmosphere of catalyst heating had a great impact on the active phase dispersion, the chemical composition of the surface layer and the O 2 adsorption capacity of the Pt/SnO 2 catalysts. TOF-SIMS analysis and XRD measurements showed that the heat treatment in an atmosphere of H 2 promotes the formation of bimetallic compounds of Pt-Sn and different species such as PtOH, PtO 2 , PtO 2 H, PtOCl, PtSnO, PtSnOH. It was stated that their presence significantly affects the activity of the catalyst in the CO oxidation. The catalyst capacity of O 2 adsorption varied depending on the treatment conditions. The catalyst treated at 600°C in oxygen showed the greatest ability of oxygen adsorption. A significant difference in the activities between the catalyst samples heated in O 2 or H 2 atmosphere was found. The highest activity was obtained for 1%Pt/SnO 2 sample treated in oxygen at 700°C. The treatment in hydrogen above 100°C caused a decrease in the catalyst activity.

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Section: Platinum Dispersionmentioning

confidence: 99%

“…The literature data [21,[38][39][40][41] show that the affinity of CO and O 2 to the platinum surface for these gases is quite different and the sticking coefficient of carbon monoxide is significantly higher than for oxygen. It means that carbon monoxide can be Fig.…”

Section: Oxygen Adsorptionmentioning

confidence: 99%

CO oxidation over Pt/SnO2 catalysts

Śmiechowicz

Kocemba

Rogowski

et al. 2018

Reac Kinet Mech Cat

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“…Furthermore, when freshly activated cluster catalysts were used for hydrocarbon reactions, hydrocarbonaceous ligands were formed which first promoted and then partially poisoned the cluster, the catalyst eventually achieving a reproducible activity [5,7]. Catalytic activities quoted in this paper are values for catalysts in this reproducible state.…”

Section: Introductionmentioning

confidence: 98%

“…First, infrared and EXAFS spectroscopies show that impregnation of these cluster compounds onto the supports, pretreated as described in reference 3, result in no chemical change and no catalytic activity.. Second, catalytic activation by heating in helium or in vacuum at 10 K nun to 523 K results in the loss or reaction of a minority (typically 10%) of the carbonyl ligands [3], and provides materials which adsorbed CO and Oz at room temperature [4] and which are active catalysts for reactions involving hydrogen [5][6][7][9][10][11]. Evidence from uv-visible spectroscopy [3], EXAFS spectroscopy [8][9][10] and high resolution transmission electron microscopy [3] confirm that the clustered state is retained.…”

Section: Introductionmentioning

confidence: 99%

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Volcano relationships in metal cluster catalysis: An infrared spectroscopic monitor of site character

Wells

Jackson

Whyman

1999

React Kinet Catal Lett

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Active osmium cluster catalysts (derived from Os3(CO)12, H2Os3(CO)10, HaOs4(CO)12, Os6(CO)ls and H2OsloC(CO)24 supported on silica, alumina, titania, and ceria) contain, in their infrared spectra, a band in file region 1930 -1985 cm "~ that is characteristic of the cluster/support combination. The activities of these catalysts for reactions of hydrogen with ethene, carbon monoxide, carbon dioxide, and ethane, relate to their characteristic CO stretching frequencies, giving 'volcano' curves. Evidence from ethene hydrogenation kinetics confirms that the characteristic CO-frequency is a monitor of strength of adsorption at the catalytically active site.

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Catalytic Steam Gasification of Cellulose Using Reactive Flash Volatilization

Chan

Tanksale

2014

ChemCatChem

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Biomass gasification is considered to be one of the most promising technologies to deliver renewable energy. However, tar formation in the gasifier is one of the main challenges. Ni‐based catalysts are one of the most effective transition‐metal catalysts in biomass gasification for tar cracking and reforming. Alumina‐supported Ni, Pt‐Ni, Ru‐Ni, Re‐Ni and Rh‐Ni catalysts were tested for their activity in the reactive flash volatilisation (RFV) of cellulose to produce synthesis gas in 50 ms reaction time. RFV is a catalytic gasification process that utilises a high carbon space velocity and mass flow rate with oxygen and steam as gasification agents. Re‐Ni, Rh‐Ni and Ru‐Ni supported catalysts showed a higher gasification efficiency than the other catalysts, which was because of their higher metal surface area, high reducibility and lower CO desorption temperature. The highest gasification efficiency was achieved at 750 °C with a carbon‐to‐oxygen ratio of 0.6 and a carbon‐to‐steam ratio of 1.0 without any oxygen breakthrough.

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Supported Metal Catalysts: Preparation, Characterization, and Function

Cited by 73 publications

References 0 publications

CO oxidation over Pt/SnO2 catalysts

CO oxidation over Pt/SnO2 catalysts

Volcano relationships in metal cluster catalysis: An infrared spectroscopic monitor of site character

Catalytic Steam Gasification of Cellulose Using Reactive Flash Volatilization

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