Catalytic reduction of nitric oxide over activated carbons

Ahmed, Shamim; Baldwin, R.M.; Derbyshire, F.J.; McEnaney, B.; Stencel, J.M.

doi:10.1016/0016-2361(93)90044-3

Cited by 72 publications

(41 citation statements)

References 8 publications

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“…However, in the case of calcined Fe/AC adsorbent the micropore surface area was significantly lower compared to the other impregnated adsorbents. Even though the literature [2] indicates no direct correlation of the BET surface area and pore volume of the adsorbents with their NO removal efficiency, these results show that the NO removal efficiency is related to micropore parameters such as micropore volume and microproe surface area. The NO removal efficiency of the adsorbents was observed to increase with increase in the the micropore volume and surface area of an adsorbent.…”

Section: No Adsorption In the Presence Of Oxygencontrasting

confidence: 65%

“…In this process, NO x is selectively reduced to nitrogen in the presence of oxygen over supported vanadia catalyst using ammonia as the reductant at temperatures ranging from 350 to 450°C [2][3][4]. Because of the good activity of the SCR catalyst at the high operating temperature the location of the SCR unit is restricted in the power plant.…”

Section: Introductionmentioning

confidence: 99%

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Removal of Nitric Oxide over Saskatchewan Lignite and its Derivatives

et al. 2006

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Adsorption of nitric oxide was studied over reduced and unreduced Fe, Cu, Co and Ni impregnated activated carbons (AC) in a microreactor system in the presence and absence of oxygen. In the absence of oxygen reduced Fe-AC showed an NO removal efficiency of 58% which was higher than that of virgin activated carbon by a factor of 2.5. The removal efficiency of Cu-AC with and without oxygen was in the range of 44-46%.

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Section: No Adsorption In the Presence Of Oxygencontrasting

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Removal of Nitric Oxide over Saskatchewan Lignite and its Derivatives

et al. 2006

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“…Activated carbon (AC) exhibits catalytic activity towards NO reduction with NH 3 at temperatures as low as 100-200 o C, making the SCR process easily retrofit into an existing flue gas cleaning system [4,[8][9][10]. However, the main disadvantage of AC is the low SCR activity.…”

Section: Introductionmentioning

confidence: 99%

“…The most effective technique to eliminate NO is the selective catalytic reduction (SCR) of NO with NH 3 [1,[3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Promoting role of sulfur groups in selective catalytic reduction of NO with NH3 over H2SO4 modified activated carbons

Guo

Wen

Cheng

et al. 2015

Korean J. Chem. Eng.

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To determine the role of sulfur groups formed on activated carbon (AC) in the selective catalytic reduction (SCR) of NO with NH 3 , coal-based AC was modified by H 2 SO 4 under various conditions and then treated in N 2 atmosphere at 400 o C. The resulting carbons were characterized by N 2 adsorption, elemental analysis, temperature programmed desorption and X-ray photoelectron spectroscopy, and tested for the SCR of NO with NH 3 in the temperature range of 30-250 o C. Results reveal that H 2 SO 4 modification has little effect on the textural properties, but promotes the formation of sulfur and oxygen groups. The sulfur groups incorporated by H 2 SO 4 modification are mainly sulfonic groups and then sulfates. In particular, these sulfur groups play a predominant role in improving NH 3 adsorption and then enhancing the SCR activity of modified carbons above 150 o C. However, the contribution of oxygen groups to NO reduction is very limited under the conditions employed in this work.

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“…Different NO x abatement methods have been recommended. AC is considered valuable either as catalyst support or as solid reactant for NO x reduction to nitrogen (N 2 ) and can evade reductant slip (Ahmed et al, 1993;Teng et al, 1992;. AC is usually prepared from the pyrolysis and the following activation, either by physical or chemical processes, of coal, wood byproducts, various types of cellulose materials and pitches (Ahmadpour and Do, 1996;Molina-Sabio et al, 1996).…”

Section: Introductionmentioning

confidence: 99%

Development of an Innovative Circulating Fluidized-Bed with Microwave System for Controlling NOx

Chang

Yan

Tseng

et al. 2012

Aerosol Air Qual. Res.

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Selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR) technique are widely used to control nitrogen oxides emissions. However, both techniques have a general shortcoming known as NH 3 slip.This research introduced the design of activated carbon in a circulating fluidized-bed with microwave system and developed an innovative de-NO x technique. The whole system demonstrated the capability and advantage of reducing reductant cost and continuous process. The experiments investigated microwave to regenerate activated carbon (AC) in order to increase adsorption and destruction efficiency while reducing energy consumption. In the NO x abatement process, activated carbon adsorbed NO and NO 2 and then utilized microwave heating technology to regenerate itself because of microwave's high energy utilization and strong penetration ability. The specific surface areas of AC increased from 673.03 to 834.52 (m 2 /g) when microwave power was increased from 0 to 550 W, respectively, in this study. Through increasing the specific surface area, the microwave treatment further improved the NO x adsorption capacity and rate.In consequence, the results indicated that destruction efficiency of NO and NO 2 at 200 ppm could reach about 80% with microwave power of 350 W and above 85% of 550 W. The destruction efficiency at 550 W for NO x was about 77%.

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Catalytic reduction of nitric oxide over activated carbons

Cited by 72 publications

References 8 publications

Removal of Nitric Oxide over Saskatchewan Lignite and its Derivatives

Removal of Nitric Oxide over Saskatchewan Lignite and its Derivatives

Promoting role of sulfur groups in selective catalytic reduction of NO with NH3 over H2SO4 modified activated carbons

Development of an Innovative Circulating Fluidized-Bed with Microwave System for Controlling NOx

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