Kinetics of post-combustion nitric oxide reduction by waste biomass fly ash

Chen, Wei-Yin; Gathitu, Benson

doi:10.1016/j.fuproc.2011.04.019

Cited by 8 publications

(3 citation statements)

References 29 publications

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“…Wang et al and Yamashita et al reported a considerable increase in NO reduction with high CO concentrations. , There appears to be no consensus on the catalytic effect of minerals in the char for the NO–char reaction. − Tullin et al reported on the decreasing importance of the pores with a decreasing particle size, and Sun et al noted the inaccuracy of a random pore model for high carbon conversions. ,, Biomass chars reportedly behave differently than coal chars with respect to NO–char rate, reaction order, and other trends under otherwise similar conditions . In general, biomass chars are more reactive than lignite chars . A single particle model, specific to biomass char, has been proposed by Karlstrom et al to correlate NO–char reaction conditions to NO release …”

Section: Introductionmentioning

confidence: 99%

“…28 In general, biomass chars are more reactive than lignite chars. 29 A single particle model, specific to biomass char, has been proposed by Karlstrom et al to correlate NO−char reaction conditions to NO release. 30 Because the carbon in a char reacts during the NO−char reaction, the morphology and reactivity of the remaining char may change and the nature of this change depends upon the conditions under which the burnout occurred.…”

Section: ■ Introductionmentioning

confidence: 99%

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Kinetics of NO Reduction by Coal, Biomass, and Graphitic Chars: Effects of Burnout Level and Conditions

et al. 2014

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During the combustion of coal and other carbonaceous materials, the heterogeneous reaction of NO with the evolving char created in the combustion process is important for understanding the formation and reduction of NO. This investigation quantifies the effects of char burnout level and conditions on the kinetics of NO reduction by chars made from coals ranging in rank from lignite to low-volatile bituminous (Beulah Zap, Dietz, Utah Blind Canyon, Pittsburgh #8, and Pocahontas #3) as well as graphite and coconut char. Kinetic data were measured in a packed-bed reactor at temperatures between 723 and 1173 K. The rate constant for the NO−char reaction was found to depend upon the extent of burnout/conversion and conditions under which the char was burned out. The NO−char rate constant consistently decreases with increasing burnout when the char burnout levels are accomplished in a drop tube reactor at 1800 K and 3−5% O 2 . However, the NO−char rate constant increases as char burnout increases (up to 90%) when the char burnout levels result from reacting the char with 3050 ppm of NO in a packed bed at 723−1173 K. For the latter case, the relationship of the NO−char rate constant (on the basis of moisture ash-free char mass) and char burnout is approximately linear with roughly the same upward slope between 20 and 80% burnout for all coal chars studied. The activation energy of the NO−char reaction is apparently independent of both char burnout level and burnout conditions. The CO 2 /CO ratio in the exhaust stream appears to correlate with the NO−char rate constant for the chars burned out at low-temperature conditions.

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Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Kinetics of NO Reduction by Coal, Biomass, and Graphitic Chars: Effects of Burnout Level and Conditions

et al. 2014

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“…The nitrogen oxides (NOx) in coal combustion flue gas are one of the leading causes of environmental pollution and health hazards, depletion of ozone in the stratosphere, and the formation of smog and acid rain. , Therefore, adequate measures need to be taken to remove NOx from combustion flue gas before emission. Selective catalytic reduction (SCR) and selective noncatalytic reduction (SNCR) have been used to mitigate the NOx emission in power plants. , The SNCR process is more attractive than SCR because of the conversion of NOx at lower temperatures.…”

Section: Introductionmentioning

confidence: 99%

Kinetics and Mechanism of Catalytic Oxidation of NO in Coal Combustion Flue Gas over Co-Doped Mn–Ti Oxide Catalyst

et al. 2020

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The coprecipitation method was used to prepare Mn/Ti, Mn/Co/Ti, and Co/Ti metal oxide catalysts to oxidize NO with O 2 . The influence of the concentrations of NO and O 2 on the oxidation of NO was investigated. Besides, the changes in the reaction rate with the particle size of the catalysts were investigated to determine the internal diffusion resistance. The surface area and microcrystalline structure of the catalysts were analyzed to investigate the impact of physical structure on SO 2 poisoning in the catalyst. It was observed that Co doping in Mn/TiO 2 had a favorable impact on reducing the effect of SO 2 poisoning during the NO oxidation reaction. On the basis of the kinetic study, it was concluded that the reaction followed the Langmuir−Hinshelwood (L-H) mechanism, where NO and O 2 were adsorbed on the catalyst, forming highly reactive NO + and O − , which were then converted into NO 2 . The Co doping into the TiO 2 crystal lattice increased the O 2 adsorption, thus accelerating the rate of NO oxidation reaction.

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Experimental and kinetics study of NO heterogeneous reduction on semi-coke and its chars: Effects of high-temperature rapid pyrolysis and atmosphere

Wang

Bai

Wang

et al. 2023

Energy

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Kinetics of post-combustion nitric oxide reduction by waste biomass fly ash

Cited by 8 publications

References 29 publications

Kinetics of NO Reduction by Coal, Biomass, and Graphitic Chars: Effects of Burnout Level and Conditions

Kinetics of NO Reduction by Coal, Biomass, and Graphitic Chars: Effects of Burnout Level and Conditions

Kinetics and Mechanism of Catalytic Oxidation of NO in Coal Combustion Flue Gas over Co-Doped Mn–Ti Oxide Catalyst

Experimental and kinetics study of NO heterogeneous reduction on semi-coke and its chars: Effects of high-temperature rapid pyrolysis and atmosphere

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