Combined DeSOx/DeNOx reactions on a copper on alumina sorbent-catalyst. 3. DeNOx behavior as a function of the surface coverage with sulfate species

Centi, Gabriele; Passarini, N.; Perathoner, Siglinda; Riva, A.; Stella, Giuseppina

doi:10.1021/ie00008a018

Cited by 37 publications

(30 citation statements)

References 20 publications

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“…This is related to an initial competition between adsorption of ammonia to form ammonium bisulphate and reaction of NH3 with NO to form N2 (6). In fact, it was previously shown copper-on-alumina samples is nearly independent of the presence on it of sulphate species.…”

Section: Resultsmentioning

confidence: 95%

Contemporaneous Removal of SO₂ and NO from Flue Gas Using a Regenerable Copper-on-Alumina Sorbent—Catalyst

Centi

Passarini²,

Perathoner

et al. 1994

Environmental Catalysis

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The kinetics and reaction mechanism of SO 2 oxidation-sorption (DeSOx) and simultaneous reduction of NO by NH 3 /O 2 (DeNOx) on copper oxide on alumina are presented with reference to the development of this system for the application to a dry technology for the removal of SO 2 and NO from flue gas based on a regenerable sorbent-catalyst. The DeSOx reaction kinetics and differences for fresh and for stabilized samples and the influence of pellet diameter and support porosity characteristics on the efficiency of SO 2 capture are reported. Aspects of the nature of the active copper sites and differences between fresh and stabilized samples, regenerability of sulphated samples and behavior of copper-on-alumina in the conversion of NO to N 2 by NH 3 /O 2 during the simultaneous capture of SO 2 are also discussed.The worldwide trend toward lower levels of pollutant emissions from power generating plants has spurred significant interest in the development of new less costly technologies capable of reducing emissions of SO2 (DeSOx) and NOx (DeNOx). State-of-the-art power plants employ individual unit operations for SO2 and NOx control. Wet or dry flue gas desulphurization (FGD) systems can achieve 70 to 90% SO2 removal, depending on process design, fuel characteristics and emission regulations, and selective catalytic reduction (SCR) systems are also achieving more than 80% NO reduction. A process design integrating SO2 and NOx removal in a single unit operation offers the potential for reducing the cost of environmental control; such a design, however, should adhere to the following requirements:• minimum waste production or the formation of valuable by-products• rnirtimization of energy use, especially in the cooling or reheating of flue gas, i.e. the technology must operate at the same temperature as that of the flue gas after the first economizer (around 350°C)

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Section: Resultsmentioning

confidence: 95%

Contemporaneous Removal of SO₂ and NO from Flue Gas Using a Regenerable Copper-on-Alumina Sorbent—Catalyst

Centi

Passarini²,

Perathoner

et al. 1994

Environmental Catalysis

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“…The desorption peak at low temperature is rather wide, which may be the superposition of two or more peaks. These desorption peaks indicate that there are multi-activity sides with adsorbed NO x on the CuO-CeO 2 -MnO x /γ-Al 2 O 3 catalysts [1]. Most of the adsorbed NO on the catalysts is desorbed when the temperature is high than 475 .…”

Section: Desorption Properties Of Nomentioning

confidence: 97%

Selective catalytic reduction of NO with NH3 over sol-gel-derived CuO-CeO2-MnOx/γ-Al2O3 catalysts

Zhao

Xiang

Sun

et al. 2009

J. Cent. South Univ. Technol.

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Granular CuO-CeO 2 -MnO x /γ-Al 2 O 3 catalysts were synthesized by the sol-gel method. The performance of the CuO-CeO 2 -MnO x /γ-Al 2 O 3 catalysts for the selective catalytic reduction (SCR) was studied in a fixed bed system. Preliminary tests were carried out to analyze the behavior of NH 3 and NO over catalyst in the presence of oxygen. The optimum temperature range for SCR over the CuO-CeO 2 -MnO x /γ-Al 2 O 3 catalysts is 300−400 . The catalysts maintain nearly 100% NO conversion at 350 ℃ . The ℃ NH 3 oxidation experiments show that both NO and N 2 O are produced gradually with the increase of temperature. The catalysts in this experiment have a stronger oxidation property on NH 3 , which improves the denitrification activity at low temperature. The over-oxidation of NH 3 at high temperature is the main cause leading to a decrease in the NO conversion. The NH 3 and NO desorption experiments show that NH 3 and NO can be adsorbed on CuO-CeO 2 -MnO x /γ-Al 2 O 3 granular catalysts. The transient response of NH 3 and NO indicates that the SCR reaction proceeds in accordance with the Eley-Rideal mechanism. The adsorbed NO has little influence on the denitrification activity in SCR process.

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“…1,6,7 More than 80% of NO was reduced at the optimum temperature and U g below 1.5U mf . The sharp decrease of NO conversion with increasing U g may be due to bypassing of reactant gas through bubbles and decrease of gas residence time in the fluidized-bed reactor.…”

Section: Spectra (D) Bands Of (N=c=o)mentioning

confidence: 97%

Selective catalytic reduction by urea in a fluidized‐bed reactor

Roh

Jung

Jeong

et al. 2003

J of Chemical Tech & Biotech

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The selective catalytic reduction (SCR) of NO x by urea as a reducing agent was carried out over fresh and sulfated CuO/γ -Al 2 O 3 catalysts in a fluidized-bed reactor. The optimum temperature ranges for NO reduction on the fresh and sulfated CuO/γ -Al 2 O 3 catalysts were 300-350• C and 400-450 • C, respectively. NO reduction with the sulfated CuO/γ -Al 2 O 3 catalyst was somewhat higher than that with the fresh CuO/γ -Al 2 O 3 catalyst. N 2 O formation increased with increasing reaction temperature. Ammonia (NH 3 ) slip increased with increasing gas velocity and decreased with increasing reaction temperature.

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Combined DeSOx/DeNOx reactions on a copper on alumina sorbent-catalyst. 3. DeNOx behavior as a function of the surface coverage with sulfate species

Cited by 37 publications

References 20 publications

Contemporaneous Removal of SO₂ and NO from Flue Gas Using a Regenerable Copper-on-Alumina Sorbent—Catalyst

Contemporaneous Removal of SO₂ and NO from Flue Gas Using a Regenerable Copper-on-Alumina Sorbent—Catalyst

Selective catalytic reduction of NO with NH3 over sol-gel-derived CuO-CeO2-MnOx/γ-Al2O3 catalysts

Selective catalytic reduction by urea in a fluidized‐bed reactor

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Combined DeSOx/DeNOx reactions on a copper on alumina sorbent-catalyst. 3. DeNOx behavior as a function of the surface coverage with sulfate species

Cited by 37 publications

References 20 publications

Contemporaneous Removal of SO2 and NO from Flue Gas Using a Regenerable Copper-on-Alumina Sorbent—Catalyst

Contemporaneous Removal of SO2 and NO from Flue Gas Using a Regenerable Copper-on-Alumina Sorbent—Catalyst

Selective catalytic reduction of NO with NH3 over sol-gel-derived CuO-CeO2-MnOx/γ-Al2O3 catalysts

Selective catalytic reduction by urea in a fluidized‐bed reactor

Contact Info

Product

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About

Contemporaneous Removal of SO₂ and NO from Flue Gas Using a Regenerable Copper-on-Alumina Sorbent—Catalyst

Contemporaneous Removal of SO₂ and NO from Flue Gas Using a Regenerable Copper-on-Alumina Sorbent—Catalyst