Electrochemical Promotion of Sulfur Dioxide Catalytic Oxidation

Petrushina, Irina; Bandur, Viktor; Cappeln, Frederik Vilhelm; Bjerrum, Niels

doi:10.1149/1.1393640

Cited by 39 publications

(33 citation statements)

References 16 publications

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“…Particular methane would be convenient because the development of natural gas-powered vehicles will require the development of more active catalysts to remove N x O y from the exhaust. [1][2][3] The present work is a continuation of our research in the fields of electrochemical promotion [4][5][6] and fuel cells, first the phosphoric acid fuel cells 7 and in the last ten years the polybenzimidazole ͑PBI͒-phosphoric acid fuel cells. 8 The latter have a combination of advantages obtained from polymeric electrolyte fuel cells and phosphoric acid fuel cells, especially the ability to work at temperatures up to 200°C, i.e., elimination of the problem of CO poisoning of the Pt catalyst.…”

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confidence: 88%

“…3. The CH 4 conversion was calculated on the basis of mass spectral data, and the mass spectrometer was calibrated with flows containing a known composition of CH 4 .…”

Section: -36mentioning

confidence: 99%

“…Therefore, this kind of electrochemical promotion was called charge-induced ͑CI͒ EP. We registered the CI promotion in the case of EP of catalytic reaction on a liquid catalyst 4 and in the case of EP of catalytic NO reduction with hydrogen in the ͑NO, H 2 , Ar͒, Pt/C͉PBI-H 3 PO 4 ͉Pt/C, ͑H 2 ,Ar͒ fuel cell in the case of high hydrogen partial pressure ͑effect of a positive polarization͒. 6 Another type of EP is in the case when the Fermi level of the catalyst is changed by changing of the chemical potential, i.e., through an electrochemical reaction.…”

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confidence: 99%

“…The fact that ⌳ ӷ 1 means that the promotion effect is not electrocatalytic but EPP in nature. It can be assumed that the presence of Pt-H ads sites improves the CH 4 and O 2 cochemisorption conditions.…”

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confidence: 99%

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Catalytic Reduction of NO by Methane Using a Pt∕C∕polybenzimidazole∕Pt∕C Fuel Cell

Petrushina¹,

Cleemann²,

Refshauge³

et al. 2007

J. Electrochem. Soc.

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The catalytic NO reduction by methane was studied using a (normalNnormalO,normalCH4,normalAr),Pt∣polybenzimidazole(PBI)–H3normalPO4∣Pt,(H2,normalAr) fuel cell at 135 and 165°C . It has been found that, without any reducing agent (like CnormalH4 ), NO can be electrochemically reduced in the (NO, Ar), Pt∕C∣PBI–H3normalPO4∣Pt∕C , (normalH2,Ar) fuel cell with participation of H+ or electrochemically produced hydrogen. When added, methane partially suppresses the electrochemical reduction of NO. Methane outlet concentration monitoring has shown the CnormalH4 participation in the chemical catalytic reduction, i.e., methane co-adsorption with NO inhibited the electrochemical NO reduction and introduced a dominant chemical path of the NO reduction. The products of the NO reduction with methane were N2 , normalC2normalH4 , and water. The catalytic NO reduction by methane was promoted when the catalyst was negatively polarized (−0.2V) . Repeated negative polarization of the catalyst increased the NO conversion. Maximum NO conversion was 48%. This effect was explained as a result of the reaction of the electrochemically produced hydrogen.

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confidence: 88%

“…3. The CH 4 conversion was calculated on the basis of mass spectral data, and the mass spectrometer was calibrated with flows containing a known composition of CH 4 .…”

Section: -36mentioning

confidence: 99%

mentioning

confidence: 99%

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confidence: 99%

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Catalytic Reduction of NO by Methane Using a Pt∕C∕polybenzimidazole∕Pt∕C Fuel Cell

Petrushina¹,

Cleemann²,

Refshauge³

et al. 2007

J. Electrochem. Soc.

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“…The present work is a continuation of our research in the fields of electrochemical promotion 1 and polymer electrolyte fuel cells.…”

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confidence: 86%

Electrochemical Promotion of NO Reduction by Hydrogen on a Platinum/Polybenzimidazole Catalyst

Petrushina¹,

Bandur²,

Cappeln³

et al. 2003

J. Electrochem. Soc.

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The electrochemical promotion of catalytic NO reduction by hydrogen was studied using a (NO, H2, Ar), Pt polybenzimidazole false(PBIfalse)H3PO4|normalPt, false(H2, Ar) fuel cell at 135°C. A mixture of NO/H2/normalAr was used as the working mixture at one electrode and a mixture of H2/normalAr was used as reference and counter gas at the other electrode. Products of NO reduction false(N2 and H2Ofalse) were analyzed by an on-line mass spectrometer. At high NO+H2+normalAr flow rate (17 mL/min; 17 and 354 mL/min, respectively, at atmospheric pressure) the maximum rate enhancement ratio was 4.65. At low NO+H2+normalAr flow rate (17 mL/min; 17 and 140 mL/min, respectively), NO reduction increased 20 times even without polarization compared to the high gas flow rate. The electrochemical promotion effect occurs at positive polarization with a maximum increase at approximately 0.08 V and with 1.5 times the zero polarization value. The promotion at the negative polarization can be attributed to the electrochemical production of the promoters. At low gas flow rates, a charge-induced change of the strength of chemisorptive bonds can take place. © 2003 The Electrochemical Society. All rights reserved.

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Electrochemical Modification of Catalytic Activity

Vayenas

Katsaounis

Brosda

et al. 2008

Handbook of Heterogeneous Catalysis

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The sections in this article are Introduction Catalytic and Electrocatalytic Kinetics Solid Electrolytes Solid Electrolyte Potentiometry ( SEP ) Electrocatalytic Operation of Solid Electrolyte Cells Electrochemical Promotion of Catalysis Selectivity Modification and Promotional Effects on Chemisorption Selectivity Modification Promotional Effects on Chemisorption Basic Questions Origin of Electrochemical Promotion Magnitude of Electrochemical Promotion and the Sacrificial Promoter Mechanism Mechanism of Metal–Support Interactions Interrelation of Promotion, Electrochemical Promotion and Metal–Support Interactions: the Double‐Layer Model of Catalysis Why the “New” Supports? Double‐Layer Approach to Catalysis Why Double Layer? Rationalization and Prediction of Desired Types of Promoters and Supports The Four Types of Rate–Work Function Dependence and the Promotional Rules Double‐Layer Isotherms and Kinetics Electropromotion of Thin Films and Electropromoted Monolithic Reactors Summary and Perspectives Outlook

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Electrochemical Promotion of Sulfur Dioxide Catalytic Oxidation

Cited by 39 publications

References 16 publications

Catalytic Reduction of NO by Methane Using a Pt∕C∕polybenzimidazole∕Pt∕C Fuel Cell

Catalytic Reduction of NO by Methane Using a Pt∕C∕polybenzimidazole∕Pt∕C Fuel Cell

Electrochemical Promotion of NO Reduction by Hydrogen on a Platinum/Polybenzimidazole Catalyst

Electrochemical Modification of Catalytic Activity

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