The Oxidation of Carbon by Nitrous Oxide

Smith, R. Nelson; Lesnini, David; Mooi, John

doi:10.1021/j150547a015

Cited by 20 publications

(16 citation statements)

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“…The use of carbon as a reducing agent, ,− catalyst, ,,− and/or catalyst support 31,42,46,47,62-77 offers obvious potential advantages, including (a) very efficient, in situ oxygen scavenging capability, and (b) elimination of the environmentally problematic “slip” of the gaseous reducing agent (e.g., ammonia). The virtues of carbon-based catalysts have thus been scrutinized in considerable detail, especially during the last decade.…”

Section: Introductionmentioning

confidence: 99%

NO Reduction by Activated Carbons. 7. Some Mechanistic Aspects of Uncatalyzed and Catalyzed Reaction

et al. 1996

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In this last paper of a series devoted to uncatalyzed and catalyzed reduction of NO by carbon, we discuss some mechanistic aspects of this reaction, which is thought to be a viable alternative to selective catalytic reduction by ammonia or hydrocarbons. We present a summary of the results of isothermal and temperature-programmed reduction studies on a metal-free activated carbon and carbon loaded with K, Ca, Fe, Cu, Cr, Co, and Ni catalysts. All the results obtained on catalyzed NO reduction are consistent with a simple oxidation-reduction (redox) mechanism involving the following kinetically significant steps: (1) chemisorption of NO on the catalyst surface; (2) transfer of oxygen from the catalytically active sites to the carbon reactive sites; and(3) desorption of oxygen from the carbon surface. A comparison with the proposed mechanisms for selective catalytic reduction is offered, as well as a mechanistic interpretation of the NO reduction enhancement in the presence of O 2 .

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Section: Introductionmentioning

confidence: 99%

NO Reduction by Activated Carbons. 7. Some Mechanistic Aspects of Uncatalyzed and Catalyzed Reaction

et al. 1996

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“…For this calculation, a representative activation energy of 157.7 kJ/mol from Smith et al (1957) was assumed. The corresponding preexponential factor for the fit curve presented in Figure 3.67 was 2.1 x 10 8 ppm/min.…”

Section: Temperature-programmed Reaction (Tpr) Resultsmentioning

confidence: 99%

“…At low temperatures, the principal reaction products are N 2 and CO 2 Smith, et al, 1957;Zhu and Lu, 1999a), and the amount of CO increases with increasing temperature. However, some workers (Shah, 1929;Teng et al, 1997) found that the gaseous products of the combustion of carbon in N 2 O were mainly CO 2 , N 2 with lesser amounts of CO.…”

Section: No Reductionmentioning

confidence: 99%

“…The consensus in the literature (Strickland-Constable, 1938;Madley and StricklandConstable, 1953;Smith et al, 1957;Johnsson, 1994;Zhu and Lu, 1999a;Liu et al, 2001) is that the N 2 O-carbon reaction is generally close to first-order with respect to N 2 O. However, reported almost zero order behavior at low temperature for reduction over a lignite coal (DE53).…”

Section: Thermal Desorption From Potassium-promoted Resin Charmentioning

confidence: 99%

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DEVELOPMENT OF HIGH ACTIVITY, CATALYTIC SYSTEMS FOR NOx REDUCTION

UNKNOWN¹

2001

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This project was directed at an investigation of catalytic NO x reduction on carbonaceous supports at low temperatures. The experimental work was conducted primarily in a packed bed reactor/gas flow system that was constructed for this work. The analytical techniques employed were mass spectrometry, NO x chemiluminescence, and gas chromatography. The experimental plan was focused on steady-state reactivity experiments, followed by temperature programmed desorption (TPD) of surface intermediates, and also selected temperature-programmed reaction (TPR) experiments. Both uncatalyzed and catalyzed (potassium-promoted) phenolic resin char, were investigated as well as the catalytic effect of additional CO in the gas phase.

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“…Oxides of nitrogen which are formed during coal combustion can subsequently react with carbon to produce nitrogen gas (Smith et al 1957;Bedjai et al 1958;Watts 1958).…”

Section: The Carpon-qxipes Qf Nitrogen Reactionmentioning

confidence: 99%