Catalytic Oxidation of Methane

Anderson, R. B.; Stein, K. C.; Feenan, J. J.; Hofer, L. J. E.

doi:10.1021/ie50622a024

Cited by 272 publications

(104 citation statements)

References 2 publications

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“…The conversions of methane and propene obtained on o~-AI203 and "y-AI203 were only slightly higher than in an empty reactor and hence the activity of these support materials can be neglected. These results agree with observations of Cullis and Willatt (1983), albeit the activity of a catalyst can be strongly influenced by changing the support material; see Anderson et al_ (1961) and Niwa et al (1983).…”

Section: Influence Of Watersupporting

confidence: 90%

“…Hicks et al (1990a,b) concluded that the activity of supported Pt and Pd catalysts is very structure sensitive; this was explained by the differences in the reactivity of the adsorbed oxygen on the different forms of the metal surfaces. Anderson et al (1961) studied the activity of different catalysts on the same A1203 support material and found the following order of reactivity for the oxidation of methane: Pt >Pd > Mn > Cu.…”

Section: Influence Of Watermentioning

confidence: 99%

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The catalytic oxidation of organic contaminants in a packed bed reactor

Beld

Bijl

Reinders

et al. 1994

Chemical Engineering Science

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Abstract--The catalytic oxidation of several hydrocarbons was studied over noble metal and metal oxide catalysts. A fast empirical method was developed to determine the minimum operating temperature required to guarantee complete conversion of the hydrocarbon.The influence of the operating parameters such as the inlet concentration and residence time, as well as the chemical character of the component to be oxidized, have been investigated. The results can be described satisfactorily by a simple isothermal, plug flow reactor model and first-order reaction kinetics. In the case of simultaneous oxidation of different components a significant mixture effect was not observed. The presence of water in the feed did significantly inhibit the oxidation of alkanes.Of the applied catalysts, Pt was the most effective for the combustion of the alkenes, whereas Pd showed a higher activity for the oxidation of alkanes.

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Section: Influence Of Watersupporting

confidence: 90%

Section: Influence Of Watermentioning

confidence: 99%

The catalytic oxidation of organic contaminants in a packed bed reactor

Beld

Bijl

Reinders

et al. 1994

Chemical Engineering Science

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“…3,10 For most catalysts and VOC concentrations practically encountered, the rate dependence on the VOC concentration appears to follow a first-order kinetics. 3,11,29 Concerning the VOC concentrations in the feed gas studied in this work, the molar ratio of O 2 /VOC was estimated to be 150-300 for benzene, 140-240 for n-hexane, and 140-570, neglecting the C 0 = 14,700 mg/m 3 , for the oil vapor. Thus, a first-order kinetics with respect to VOC concentration is reasonably assumed in this study…”

Section: Resultsmentioning

confidence: 86%

“…Kinetics of the catalytic oxidation of hydrocarbons has been extensively studied. 3,9,[23][24][25][26][27][28][29] These studies show that reaction characteristics and oxidation mechanisms are different between noble metal and metal oxide systems. There is no one consistent mechanism that adequately describes the oxidation kinetics for alkanes, alkenes, aromatics, oxygenates, and so forth, over typical VOC catalysts.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of Catalytic Oxidation of Benzene,n-Hexane, and Emission Gas from a Refinery Oil/Water Separator over a Chromium Oxide Catalyst

Wang

Chou

2000

Journal of the Air & Waste Management Association

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With the advances made in the past decade, catalytic incineration of volatile organic compounds (VOCs) has become the technology of choice in a wide range of pollution abatement strategies. In this study, a test was undertaken for the catalytic incineration, over a chromium oxide (Cr 2 O 3 ) catalyst, of n-hexane, benzene, and an emission air/vapor mixture collected from an oil/water separator of a refinery. Reactions were carried out by controlling the feed stream to constant VOC concentrations and temperatures, in the ranges of 1300-14,700 mg/m 3 and 240-400 °C, respectively. The destruction efficiency for each of the three VOCs as a function of influent gas temperature and empty bed gas residence time was obtained.Results indicate that n-hexane and the oil vapor with a composition of straight-and branch-chain aliphatic hydrocarbons exhibited similar catalytic incineration effects, while benzene required a higher incineration temperature or longer gas retention time to achieve comparable results. IMPLICATIONSEmissions from oil/water separators in petroleum refineries generally contain thousands of mg/m 3 of light aliphatic and aromatic hydrocarbons. Complete catalytic oxidation has been identified as one of the most economical and efficient techniques for the abatement of these volatile compounds. There are few reports concerning the kinetic study of the complete catalytic oxidation of these compounds over metal oxide catalysts, especially Cr 2 O 3 . This paper assists in understanding the kinetics of deep catalytic oxidation of benzene, n-hexane, and a waste oil vapor from a refinery oil/water separator. The present work also provides data on the appropriate oxidation temperatures and gas residence times for catalytic incineration of the three VOCs over a bed of commercial Cr 2 O 3 catalysts.In the range of the VOC concentrations studied, at a given gas residence time, increasing the operating temperature of the catalyst bed increased the destruction efficiency. However, the much higher temperatures required for a destruction efficiency of over 99% may be not cost-effective and are not suggested. A first-order kinetics with respect to VOC concentration and an Arrhenius temperature dependence of the kinetic constant appeared to be an adequate representation for the catalytic oxidation of these volatile organics. Activation energy and kinetic constants were estimated for each of the VOCs. Low-temperature destruction of the target volatile organics could be achieved by using the Cr 2 O 3 catalyst.

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“…Catalysts play an important role in catalytic reaction, including in oxidation. Noble metal catalysts, such as platinum (Pt) and palladium (Pd), are well-known because of its reactivity, stability, resistance to poison and thermal [3][4][5]. However, these noble metal catalysts are expensive, therefore it is impossible to use only noble metal in a catalyst system [6].…”

Section: Introductionmentioning

confidence: 99%

Ammonium hydroxide addition and its influence on the catalytic activities of Pt-based catalysts for methane oxidation

Mardwita

Bustan

2017

MATEC Web Conf.

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Abstract.A series of binary chromium-platinum catalysts were prepared and the catalytic activity was tested in methane oxidation. The effects of aqueous ammonium hydroxide addition into binary catalyst chromium-platinum catalysts were investigated. All the catalysts were prepared by impregnation method. The reactant gases were consisted of methane-oxygen-argon. The reaction was conducted at an atmospheric pressure and the temperature was ranged from 573 to 773 K. The products were analyzed using thermal conductivity detector. Under this experiment conditions, the only products were carbon dioxide and water. The catalysts were characterized using carbon monoxide chemisorptions and x-ray photoelectron spectrometer. The catalytic activity results showed that the catalyst with the addition of aqueous ammonium hydroxide has smaller platinum metal particle size and its catalytic activity is the highest compared to the other catalysts. X-ray photoelectron spectrometer recorded higher intensities and clear peaks on high pH catalysts indicating a change of interaction between chromium and platinum on alumina. However, active state of chromium was not observed on catalyst surface.

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Catalytic Oxidation of Methane

Cited by 272 publications

References 2 publications

The catalytic oxidation of organic contaminants in a packed bed reactor

The catalytic oxidation of organic contaminants in a packed bed reactor

Kinetics of Catalytic Oxidation of Benzene,n-Hexane, and Emission Gas from a Refinery Oil/Water Separator over a Chromium Oxide Catalyst

Ammonium hydroxide addition and its influence on the catalytic activities of Pt-based catalysts for methane oxidation

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