Noble metal catalysts for methane removal

Janbey, Alan; Clark, Wayne M.; Noordally, Ehsan; Grimes, Sue; Tahir, Saad

doi:10.1016/s0045-6535(03)00292-3

Cited by 40 publications

(22 citation statements)

References 15 publications

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“…Presently, catalytic oxidation of VOC seems to be one of the most effective and promising methods to satisfy the strict emission standards and therefore has received worldwide attention [1]. Supported noble metal catalysts (mainly Pt and Pd) provide high activity for the combustion of a variety of VOCs, including toluene [2][3][4], at relatively low temperatures and great resistance to deactivation [5][6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Catalytic Activity of Supported Platinum and Metal Oxide Catalysts for Toluene Oxidation

2009

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Oxidation of toluene has been investigated over supported platinum as well as over a variety metal oxide (M x O y ) catalysts dispersed on high surface area c-Al 2 O 3 . Catalysts were characterized with respect to their specific surface area (BET), metal dispersion (selective chemisorption of CO), phase composition and M x O y crystallite size (XRD) and reducibility (H 2 -TPR). Catalytic performance for the title reaction was investigated in the temperature range of 100-500°C, using a feed composition consisting of 0.1% toluene in air. For Pt/M x O y catalysts, it has been found that catalytic performance depends on the nature of the support, with Pt/CeO 2 being the most active catalyst at low temperatures. The intrinsic reaction rate per surface platinum atom does not depend on Pt loading (0.5-5 wt%), at least for Pt/Al 2 O 3 . Reducible metal oxides, such as ceria, are active for the title reaction and catalytic performance is improved significantly with increase of specific surface area (SSA). However, the intrinsic reaction rate per unit surface area is invariant with SSA. Dispersion of M x O y on high surface area inert supports, such as Al 2 O 3 , results in materials with relatively high catalytic activity, which seems to correlate well with the reducibility of metal oxides. Catalytic performance of M x O y /Al 2 O 3 catalysts can be optimized by proper selection of M x O y loading. Best performing catalysts of this series include 60% MnO, 90% CeO 2 and 5% CuO on Al 2 O 3 which, under the present experimental conditions, are able to completely convert toluene toward CO 2 at temperatures lower than 350°C. Dispersion of Pt on M x O y /Al 2 O 3 catalysts improves significantly the catalytic performance of irreducible M x O y but does not alter appreciably the activity of reducible M x O y /Al 2 O 3 catalysts.

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Section: Introductionmentioning

confidence: 99%

Catalytic Activity of Supported Platinum and Metal Oxide Catalysts for Toluene Oxidation

2009

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“…The different curve slope of catalysts containing Pd could be explained by the capability of Pd itself to give ignition phenomena. The role of Pd in methane catalytic combustion is well known and still addressed by a number of investigation [3,8,9].…”

Section: Resultsmentioning

confidence: 99%

Catalytic removal of methane over thermal-proof nanostructured catalysts for CNG engines

et al. 2007

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were prepared and characterized by XRD, BET and FESEM techniques. The activity of these catalysts towards the combustion of methane was evaluated in a Temperature Programmed Combustion (TPC) apparatus. The half conversion temperature of methane over the Co 0.8 Cr 2 O 4 catalyst was 369°C with a W/F = 0.12 g s/cm 3 . On the basis of Temperature Programmed Desorption (TPD) of oxygen as well as of catalytic combustion runs, the prevalent activity of the Co 0.8 Cr 2 O 4 catalyst could be explained by its higher capability to deliver suprafacial chemisorbed oxygen species. This catalyst, promoted by the presence of 1 wt% of Pd, deposited by wet impregnation, was lined on cordierite monoliths and then tested in a lab-scale test rig. The combination of Pd and Co 0.8 Cr 2 O 4 catalysts enables half methane conversion at 340°C (GHSV = 10,000 h )1 ), a performance similar to that of conventional 4 wt% Pd-c Al 2 O 3 catalysts but guaranteed with just a four-fold lower amount of noble metal. Both the catalysts in powder and the monolith hosting the Co 0.8 Cr 2 O 4 + 1 wt% Pd catalyst, submitted to a thermal ageing treatment in air at 700°C for 12 h, displayed a negligible deactivation.

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“…Examples of these are: the active compound, loading [61] and oxidation state of the active compound [62,63], the washcoat material [62,64], the surface area of the catalyst and the dispersion of the active material [65], the oxygen mobility and oxygen storage capacity (OSC) of a catalyst [56,66] as well as the modifiers and promoters [67,68], even precursor salts [69,70]. Furthermore, variations in process operation conditions such as in temperature, in pressure, and in gas mixture composition influence catalyst activity [71].…”

Section: Normal Vocsmentioning

confidence: 99%

“…Furthermore, variations in process operation conditions such as in temperature, in pressure, and in gas mixture composition influence catalyst activity [71]. Real VOC emissions are usually mixtures of hydrocarbons, and in mixtures, the compound that is the most difficult to oxidize determines the rate of total oxidation [63]. In EU, the major emission sources of normal VOCs are the solvent-using industry, such as painting and coating of different products as well as refining, storage and distribution of fuels.…”

Section: Normal Vocsmentioning

confidence: 99%

Catalysis in VOC Abatement

et al. 2011

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Volatile organic compounds (VOCs) are harmful to environment and human health. Catalytic oxidation has been used in VOC abatement for over 60 years, and it has proven to be an effective technology. A large variety of VOCs set high demands for the treatment, and therefore catalytic oxidation needs still to be developed further. This paper reviews current aspects and future research needs related to VOCs and catalytic VOC treatment concentrating on solvent-based, chlorinated and sulphur-containing VOCs.

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Noble metal catalysts for methane removal

Cited by 40 publications

References 15 publications

Catalytic Activity of Supported Platinum and Metal Oxide Catalysts for Toluene Oxidation

Catalytic Activity of Supported Platinum and Metal Oxide Catalysts for Toluene Oxidation

Catalytic removal of methane over thermal-proof nanostructured catalysts for CNG engines

Catalysis in VOC Abatement

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