Thermal desorption of nitrogen oxides from activated carbon

Richter, Ekkehard; Kleinschmidt, Ralph; Pilarczyk, E.; Knoblauch, K.; Jontgen, H.

doi:10.1016/0040-6031(85)85589-1

Cited by 22 publications

(7 citation statements)

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“…The reactions of nitric oxide with carbons have been studied with a view toward their potential for reduction of NO emissions from combustion systems, and relevant literature on these reactions has been reviewed in papers dealing with the global kinetics of the gasification reaction (Suuberg et al, 1991; Teng et al, 1992). The first step of the process, involving the chemisorption of NO on the carbon surface, has been separately considered by us (Teng et al, 1990; Teng and Suuberg, 1993) and others (Zarifayanz, 1964; Zarifayanz et al, 1967;Smith et al, 1956Smith et al, , 1959Shah, 1929;Harker et al, 1966;Hall, 1971,1972;Pastor et al, 1957; Dianis and Lester, 1974;Richter, 1983;Richter et al, 1985; Cascarini de Torre and Arvia, 1968; Kaneko, 1987Kaneko, ,1988Kaneko, ,1989; Kaneko and Shindo, 1989; Kaneko et al, 1987aKaneko et al, ,b, 1988aKaneko et al, -c, 1989aKaneko et al, ,b, 1991; Matsumoto et al, 1989; Uchiyama et al, 1990;DeGroot et al, 1991). Most of these studies have concluded that if temperatures are kept low (i.e., well below ambient) mainly physisorption occurs (Smith et al, 1956;Brown and Hall, 1971).…”

Section: Introductionmentioning

confidence: 99%

Chemisorption of nitric oxide on char. 2. Irreversible carbon oxide formation

Teng¹,

Suuberg

1993

Ind. Eng. Chem. Res.

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Section: Introductionmentioning

confidence: 99%

Chemisorption of nitric oxide on char. 2. Irreversible carbon oxide formation

Teng¹,

Suuberg

1993

Ind. Eng. Chem. Res.

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“…4, in which NO 2 was added to the feed gas containing O 2 and water. When water and NO 2 are dosed in parallel HNO 3 and HNO 2 are formed in a disproportionation reaction [15,[19][20][21]. Jeguirim et al suggested, supported by experimental and theoretical results, that HNO 3 and HNO 2 are intermediates of the C-NO 2 reaction, which can hence directly react with the carbon surface leading to an increase of the reaction rate [15].…”

Section: Pm Oxidation With O 2 and O 2 /Nomentioning

confidence: 72%

Development of a TG-FTIR system for investigations with condensable and corrosive gases

Mehring

Elsener

Kröcher

2010

J Therm Anal Calorim

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A thermogravimetric analyzer and a Fouriertransform infrared (FTIR) spectrometer were combined and redesigned for investigations with corrosive and condensable reactive gases. The standard gas inlet and outlet of the thermogravimetric analyzer were changed in order to heat the gas tubes, which are lead through the flanges, and avoid condensation in these parts of the system. Furthermore, all tubes upstream and downstream of the thermogravimetric analyzer were trace heated up to 180°C. The gas measuring cell of the FTIR spectrometer was designed such that an optimum compromise between the small flow rates through the thermogravimetric analyzer and a short residence time of the gases in the gas measuring cell could be achieved. The gas supply allows the dosage of different gas compositions containing nitrogen, oxygen, water, NH 3 , and NO 2 , for example. The system was validated by analyzing the composition of a diesel particulate matter (PM) sample with a temperature-programmed desorption followed by oxidation (TPD/O) experiment, which showed good agreement with the established analysis methods. The reactivity of the PM sample was investigated by temperature-programmed oxidation (TPO) experiments with different reactive gas mixtures of oxygen, water, and NO 2 in nitrogen. By adding NO 2 , the soot oxidation started at lower temperatures and the addition of water lead to a shift of the maxima of the carbon oxidation rates to lower temperatures. The ratio of formed CO 2 and CO was shifted to higher values by the addition of NO 2 and water whereby the influence of water was much more pronounced.

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“…In a preliminary experiment we tested Printex U for its SCR activity under conditions similar to previous studies in the 1980s on activated carbon [5][6][7][8][9][10][11][12][13][14]24]. However, at a GHSV of 3,000 h -1 no NO x reduction activity was observed for Printex U with NH 3 when NO x was only NO.…”

Section: Scr Reaction Over Printex U In the Presence Of No And Nhmentioning

confidence: 92%

“…For special low temperature applications at 100-150°C, activated carbon catalysts were developed for the reduction of NO at space velocities of approx. 2,000 h -1 in the 1970s and 1980s [5][6][7][8][9][10][11][12][13][14]. The up to 80 % conversion reached with these catalysts strongly depends on the carbon type and pre-treatment [8].…”

Section: Introductionmentioning

confidence: 98%

Diesel Soot Catalyzes the Selective Catalytic Reduction of NOx with NH3

2013

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The catalytic activity of soot samples for the selective catalytic reduction (SCR) of NO x with NH 3 was investigated in dependence of the NO 2 , NO and NH 3 concentration in the temperature range between 200 and 350°C. The highest NO x reduction of up to 25 % was measured in the presence of both NO 2 and NO at a GHSV of 35,000 h-1. Decreasing space velocities resulted in an increase of the SCR activity. In the absence of NO 2 , NO x reduction was not observed. Carbon oxidation and SCR reaction occurred in parallel due to the presence of NO 2 and O 2 , but hardly influenced each other, which suggested that in the NO x reduction on soot most probably physisorbed species were involved. The observed stoichiometries indicated the action of the fast SCR reaction in the presence of NO and the NO 2 SCR reaction in the absence of NO, while the observed gas phase and surface species pointed at reaction steps similar to those on classical SCR catalysts.

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Thermal desorption of nitrogen oxides from activated carbon

Cited by 22 publications

References 1 publication

Chemisorption of nitric oxide on char. 2. Irreversible carbon oxide formation

Chemisorption of nitric oxide on char. 2. Irreversible carbon oxide formation

Development of a TG-FTIR system for investigations with condensable and corrosive gases

Diesel Soot Catalyzes the Selective Catalytic Reduction of NOx with NH3

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