Potassium-Containing Coal Chars as Catalysts for NO<i><sub>x</sub></i> Reduction in the Presence of Oxygen

Illán-Gómez, M.J.; Lecea, and C. Salinas-Martínez de; Linares-Solano, Á.; Radović, Ljubiša R.

doi:10.1021/ef980067w

Cited by 45 publications

(34 citation statements)

References 60 publications

(96 reference statements)

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“…The catalytic effect of metals present in a solid fuel is known to be potentially very influential in the combustion process [21][22][23][24][25]. We selected 6 petcokes among the 22, covering the range of reactivities observed, and we quantified the following metals: vanadium, copper, molybdenum, iron and manganese.…”

Section: Catalytic Effectsmentioning

confidence: 99%

Lack of correlation between the properties of a petroleum coke and its behaviour during combustion

Commandré

Salvador

2005

Fuel Processing Technology

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To cite this version:Jean-Michel Commandre, Sylvain Salvador. Lack of correlation between the properties of a petroleum coke and its behaviour during combustion. Fuel Processing Technology, Elsevier, 2005, 86 (7), p. AbstractThis work is an attempt to establish links between the properties of the petcoke that can be measured through standard analysis in the laboratory and the behaviour of the petcoke both in terms of its combustion velocity and the emission of gas pollutants.A large number of petcokes, 22, taken from different sources, were burnt in an Entrained Flow Reactor (EFR) in conditions close to those of a fluidised bed of a cement plant precalciner. The burnout for the 22 petcokes ranged from 68% to 81%. The gas emissions resulting from their combustion were analysed. Prior to this, each type of petcoke was characterised in terms of its chemical composition, volatile matter and ash content, structural properties and LCV. The correlation between all these characteristics and the combustion velocity, SO 2 emissions and NO emissions in the EFR were systematically investigated.The combustion velocity does not appear to be correlated to any of the properties. The emissions of SO 2 can be accurately predicted from the content in S of the petcoke. The emissions in NO are not directly linked to the N content of the petcoke. No simple correlation could be established to predict NO emissions.

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Section: Catalytic Effectsmentioning

confidence: 99%

Lack of correlation between the properties of a petroleum coke and its behaviour during combustion

Commandré

Salvador

2005

Fuel Processing Technology

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“…At this time, the stable denitration efficiencies of AC at three temperatures are 12.6%, -0.5%, and 2.5%, respectively. Illán-Gómez [32] carried out temperature-programmed reduction (TPR) experiments using coal-based activated carbon with 0.5% NO + 5% O2/He from room temperature to 500 °C. The results show that the denitration rate of AC decreases and then increases with the temperature.…”

Section: Effect Of Ac On No + O 2 and No + O 2 + Nhmentioning

confidence: 99%

Nitrogen Oxide Removal by Coal-Based Activated Carbon for a Marine Diesel Engine

et al. 2019

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Vanadium-based catalysts are mainly used for marine diesel exhaust denitration. However, their poor catalytic ability at low temperature and poor sulfur tolerance, as well as high toxicity and cost, are big turnoffs. AC (Activated carbon) exhibits good adsorption capacity and catalytic ability in denitration because of its high specific surface area and chemical activity. In this paper, coal-based AC was used for simulating diesel exhaust denitration in different conditions. The results show that the NO removal ability of AC is poor in an NO/N2 system. The NO2 removal ability is excellent in an NO2/N2 system, where NO is desorbed. The NOx removal efficiency is 95% when the temperature is higher than 200 °C in an NO2/NH3/N2 system. When the temperature is lower than 100 °C, AC can catalytically oxidize NO to NO2 in an NO2/O2/N2 system. The near-stable catalytic efficiencies of AC for a slow SCR (Selective Catalytic Reduction) reaction, a standard SCR reaction, and a fast SCR reaction at 300 °C are 12.1%, 31.6%, and 70.8%, respectively. When ships use a high-sulfur fuel, AC can be used after wet scrubber desulfurization to catalytically oxidize NO to NO2 at a low temperature. When ships use a low-sulfur fuel, AC can be used as a denitration catalyst at high temperatures.

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“…The larger activity of the higher Ce substituted catalysts indicates availability of reactive oxygen species on the catalytic surface, attributed to the weaker oxygen binding [25]. In this way, it is proposed that the gaseous oxygen may be dissociatively adsorbed on the surface of the metal oxide forming an oxygen adsorbed species that can react with the reactive free carbon site to give a highly reactive oxygen-carbon intermediate which can react either with the O ads or gaseous O 2 to form CO or CO 2 [26]. In the catalytic oxidation reaction using mixed oxides or perovskites types oxides as catalysts, the oxygen surface oxygen species (O -, O 2 -, O 2-) involved in the catalytic process may come from the molecular oxygen in gas phase, surface oxygen's or lattice oxygen.…”

Section: Oxygen-temperature Programmed Desorption (O 2 -Tpd)mentioning

confidence: 99%

CATALYTIC COMBUSTION OF SOOT ON Ce-DOPED LANTHANUM COBALTITES

Pecchi¹,

Morales²,

Delgado³

et al. 2014

J. Chil. Chem. Soc.

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Substituted La 1-x Ce x CoO 3 perovskite-type oxides (0.0≤x≤0.9), prepared by the self-combustion method, have been investigated as catalysts in soot combustion. The characterization results indicate modification in the specific surface area, crystal structure, oxygen mobility and reducibility of cobaltite upon cerium substitution. Cobaltite structure does not tolerate more than 50% substitution of La by Ce. For higher Ce substitution the perovskite structure is lost and mixed oxides are detected. Further destruction of the perovskite structure in a reductive process indicates a lower catalytic role of the perovskite structure in the catalytic combustion of soot regarding to the chemical composition of the La 1-x Ce x CoO 3 system. After the reductive process, only a slight increase in the catalytic activity of the samples with low Ce content (x≤0.3) while a larger increased was detected for those with larger amount of Ce(x≥0.5). These results suggest that the activity of these materials for soot combustion is improved by two factors: i) the increasing of CeO 2 content, closely related to higher material capacity for oxygen transfer from catalyst to carbonaceous surface and ii) the formation of larger CeO 2 crystals in the higher-Ce-content samples after H 2 reduction, responsible of the improvement of the oxygen exchange and number of contact points between catalyst and soot.

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Potassium-Containing Coal Chars as Catalysts for NO_x Reduction in the Presence of Oxygen

Cited by 45 publications

References 60 publications

Lack of correlation between the properties of a petroleum coke and its behaviour during combustion

Lack of correlation between the properties of a petroleum coke and its behaviour during combustion

Nitrogen Oxide Removal by Coal-Based Activated Carbon for a Marine Diesel Engine

CATALYTIC COMBUSTION OF SOOT ON Ce-DOPED LANTHANUM COBALTITES

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Potassium-Containing Coal Chars as Catalysts for NOx Reduction in the Presence of Oxygen

Cited by 45 publications

References 60 publications

Lack of correlation between the properties of a petroleum coke and its behaviour during combustion

Lack of correlation between the properties of a petroleum coke and its behaviour during combustion

Nitrogen Oxide Removal by Coal-Based Activated Carbon for a Marine Diesel Engine

CATALYTIC COMBUSTION OF SOOT ON Ce-DOPED LANTHANUM COBALTITES

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Product

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Potassium-Containing Coal Chars as Catalysts for NO_x Reduction in the Presence of Oxygen