Reduction of Nitric Oxide over Magnesium Oxide and Dolomite at Fluidized Bed Conditions

Olanders, Birgitta; Stroemberg, Dan

doi:10.1021/ef00052a016

Cited by 16 publications

(11 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore CaO remains more accessible than in the case of limestone. On the other hand, some studies reported that MgO in dolomite can also contribute to the catalytic reduction of NO with CO [39] although this effect was not seen in our experiments. The inhibiting effect of SO 2 on N 2 O decomposition is not clearly appreciated in any of the conditions tested in Figure 5(C).…”

Section: Effect Of Addition Of Ca-sorbent and Type Of Sorbentcontrasting

confidence: 92%

NO and N 2 O emissions in oxy-fuel combustion of coal in a bubbling fluidized bed combustor

Loscertales

Mendiara

Rufas

et al. 2015

Fuel

View full text Add to dashboard Cite

Emissions from coal oxy-fuel combustion are receiving significant attention during the last years. This paper is focused on the analysis of fuel-N emissions in fluidized bed combustion systems. Experiments were carried out in a bubbling fluidized bed unit in the temperature interval 850-950ºC. Different coals (anthracite, bituminous and lignite) were used as fuels and different sorbents were employed for in-bed sulphur retention. In the experiments, NO, N 2 O and NO 2 were measured. NO 2 was not detected in any of the operating conditions. The influence of temperature on NO and N 2 O emissions was the same as in conventional combustion: NO emission increased as temperature increased while N 2 O emission decreased. Nevertheless, the total fuel-N conversion to nitrogenous species seemed to be lower than in combustion with air. As in air-firing combustion, the highest levels of NO and N 2 O were registered with the highest rank coals. The Ca-sorbent was found to have a key role on NO reduction via catalytic reaction and this catalytic effect seemed not to be affected by the high CO 2 levels present in oxy-fuel combustion. Also, the moisture content in the coal affected the NO formation, which decreased 2 with an increase in the coal moisture content. A similar effect was observed by increasing the oxygen concentration fed to the combustor.

show abstract

Section: Effect Of Addition Of Ca-sorbent and Type Of Sorbentcontrasting

confidence: 92%

NO and N 2 O emissions in oxy-fuel combustion of coal in a bubbling fluidized bed combustor

Loscertales

Mendiara

Rufas

et al. 2015

Fuel

View full text Add to dashboard Cite

show abstract

“…The same reaction was also studied over quartz sand. It is known that quartz sand is relatively inactive toward the NO reduction with CO at these temperatures . No transient CO 2 production was detected, but instead the CO signal was found to shift to faster responding times (Figure ).…”

Section: Resultsmentioning

confidence: 88%

Study of the Reduction and Reoxidation of a CaO Surface

1997

View full text Add to dashboard Cite

The reduction of NO with CO and H2 is shown to comprise two basic reactions: a surface oxygen abstraction by the reducing agent and a reoxidation of the surface by NO. The former reaction step has been demonstrated by transient CO2 formation during CO exposure of oxidized CaO surfaces, while the latter was demonstrated by N2 and/or N2O transient formation during NO exposure of a prereduced CaO surface. It was shown that at low temperatures (between room temperature and 500 °C) both N2 and N2O were formed, but at temperatures above 500 °C only N2 was observed. The activation energies of the respective steps have been determined using temperature-programmed reaction experiments. The activation energy of the surface oxygen abstraction was determined to be 25 kcal/mol and is similar to the apparent activation energy of the overall reaction. The activation energy of the NO bond breakage was determined to be maximum 10 kcal/mol as measured by N2O formation. The importance of an N2O2 - or N2O2 2- intermediate in the formation of N2O will be discussed, and the importance of N2O decomposition in forming N2 at temperatures above 500 °C will be compared with a N surface diffusion mechanism.

show abstract

“…Magnesium hydroxide, especially in the suspension form, has recently attracted more and more attention and is widely applied as neutralizing agents [1,2], and acidic gas absorbents [3][4][5]. It is also recognized as an excellent material used in wastewater and industrial effluent treatment to absorb heavy metals [6,7] and organic contaminants [8].…”

Section: Introductionmentioning

confidence: 99%

The rheological behavior and stability of Mg(OH)2 aqueous suspensions in the presence of sodium polyacrylate

Tong

Song

Sun

et al. 2013

Colloids and Surfaces A: Physicochemical and Engineering Aspect

View full text Add to dashboard Cite

Reduction of Nitric Oxide over Magnesium Oxide and Dolomite at Fluidized Bed Conditions

Cited by 16 publications

References 0 publications

NO and N 2 O emissions in oxy-fuel combustion of coal in a bubbling fluidized bed combustor

NO and N 2 O emissions in oxy-fuel combustion of coal in a bubbling fluidized bed combustor

Study of the Reduction and Reoxidation of a CaO Surface

The rheological behavior and stability of Mg(OH)2 aqueous suspensions in the presence of sodium polyacrylate

Contact Info

Product

Resources

About