Catalytic NO reduction with NH3 over carbons modified by acid oxidation and by metal impregnation and its kinetic studies

Hsu, Li-Yeh; Teng, Hsisheng

doi:10.1016/s0926-3373(01)00228-4

Cited by 43 publications

(28 citation statements)

References 23 publications

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“…Of the various approaches, treatment of carbon black with HNO 3 was known to increase its hydrophilicity thereby increase the dispersion of metal/ metal complexes and enhances the performance of supported catalysts. In recent years, the effect of HNO 3 treatment on the properties and performance of supported catalysts towards various industrially important reactions, namely, the chemical reduction of NO with NH 3 [38], electrocatalytic oxidation of small organic molecules such as H 2 [39], CO [39,40] and CH 3 OH [41,42] and electrocatalytic reduction of air [43,44] and oxygen [45][46][47][48][49][50][51][52] were investigated. The results insisted the enhanced activity and stability for the HNO 3 treated carbon-supported catalysts.…”

Section: Introductionmentioning

confidence: 99%

Iron and Nitrogen containing Carbon Catalysts with Enhanced Activity for Oxygen Reduction in Proton Exchange Membrane Fuel Cells

Rao¹,

Kumar²,

Viswanathan³

2011

OJPC

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Iron and nitrogen containing carbon catalysts were prepared by the pyrolysis of iron(III)tetramethoxyphenylporphyrin complex adsorbed on as-received as well as nitric acid treated carbon black and employed them as oxygen reduction electrodes for hydrogen-oxygen PEM fuel cells. The influence of carbon surface functional groups on the dispersion of active species and electrocatalytic performance is investigated using electron microscopic and electrochemical techniques. The existence of quinone functional groups on the nitric acid treated carbon was evident from X-ray photoelectron spectroscopy and cyclic voltammetry. Rotating disk electrode voltammetry results affirmed the good electrocatalytic activity and stability of pyrolyzed macrocyclic complex adsorbed on nitric acid treated carbon compared to that of as-received carbon. This is ascribed to the greater number of Fe/N active species as well as good dispersion of metal clusters over nitric acid treated carbon support. Fuel cell tests depicted the comparable performance of pyrolyzed complex adsorbed on nitric acid treated carbon with commercial Pt/C at 353 K. Durability measurements performed under fuel cell operating conditions for 120 h indicate the good stability of the catalysts.

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Section: Introductionmentioning

confidence: 99%

Iron and Nitrogen containing Carbon Catalysts with Enhanced Activity for Oxygen Reduction in Proton Exchange Membrane Fuel Cells

Rao¹,

Kumar²,

Viswanathan³

2011

OJPC

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“…In recent years, the applications of activated carbon (AC) in catalysis have received increasing attention (Carabineiro et al, 2000;Hsu and Teng, 2001;Khristova and Mehandjiev, 1998;Zhu et al, 2000). The performance of the AC as a catalyst is supported by a large surface area, high porosity, good mechanical structure, being inexpensive, inert and the presence many suitable functional groups.…”

Section: Introductionmentioning

confidence: 99%

“…The performance of the AC as a catalyst is supported by a large surface area, high porosity, good mechanical structure, being inexpensive, inert and the presence many suitable functional groups. The application of the AC catalyst in the control of NO in air pollution by decreasing the NO concentrations is a developing field (Carabineiro et al, 2000;Garcia-Bordeje et al, 2004;Hsu and Teng, 2001). The reactions of activated carbon with NO can be characterized by chemisorption processes (<500 K) and pseudo-steady gasification reactions (>500 K) (Aarna and Suuberg, 1997).…”

Section: Introductionmentioning

confidence: 99%

“…Many metals, K, Cr, Fe, Pd, Cu Co, Ni, V, can be deposited on the surfaces of AC to increase the activity of the catalyst (Carabineiro et al, 2000;Illan-Gomez et al, 1995a, 1995bKhristova and Mehandjiev, 1998;Mehandjiev et al, 1996;Ruckenstein and Hu, 1997;Salas-Peregrin et al, 1996). The surface properties of the AC can also be modified using acid treatment (Gao and Wu, 1996;Hsu and Teng, 2001;Wang and Lu, 1998;Zhu et al, 2000). Illan-Gomez et al (1996) concluded that under typical reactions in both catalyzed and uncatalyzed NO reaction on carbon, the following reactions seem to be significant: Chemisorption process:…”

Section: Introductionmentioning

confidence: 99%

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Reduction of NO by activated carbon in the presence of vanadium

Chen

Yen

Peng

2007

Journal of the Chinese Institute of Chemical Engineers

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“…While some high-efficiency SCR technologies are under development, minus SNCR, to achieve the same NO reduction (Zhu et al, 1999;Hsu and Teng, 2001), this study attempted to improve the 3 NH injection technique of a hybrid SNCR-SCR process. Through a bench-scale hybrid process, 3 NH was injected separately, a part from the SNCR inlet and a part from the SCR inlet, to react with NO in the flue gas.…”

Section: Introductionmentioning

confidence: 99%

Improvement on Hybrid SNCR-SCR Process for NO Control: a Bench Scale Experiment

Chen

2006

Aerosol Air Qual. Res.

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The reducing agent [ammonia ( 3 NH )] injection procedure was improved for the hybrid process of selective non-catalytic reduction followed by selective catalytic reduction (hybrid SNCR-SCR) to remove nitric oxide (NO) through a bench-scale experiment. Instead of injecting all of the 3 NH from the SNCR inlet, part of it was injected from the SNCR inlet and part from the SCR inlet, to react with NO in the flue gas. The experiment resulted in the significant reduction of NO. The effects of the operational conditions such as the SNCR reaction temperature, the SCR reaction temperature, and the initial concentration ratio of 3 NH to NO were also investigated. Under the initial NO concentration of 300 ppm (dry, 6% 2 O ), the space velocities of SNCR 5100-6300 1 hr  , the space velocities of SCR 7100-10000 1 hr  , and with the initial concentration ratios of 3 NH to NO 1.0-1.5, the best operational temperatures were discovered to be SNCR reaction of 850℃ and SCR reaction of 350℃ for the improved hybrid SNCR-SCR process. In addition, a correlation equation has been developed of the maximum NO reduction under the above bestoperational temperatures for the hybrid SNCR-SCR process, and closely fits with the experiment results.

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Catalytic NO reduction with NH3 over carbons modified by acid oxidation and by metal impregnation and its kinetic studies

Cited by 43 publications

References 23 publications

Iron and Nitrogen containing Carbon Catalysts with Enhanced Activity for Oxygen Reduction in Proton Exchange Membrane Fuel Cells

Iron and Nitrogen containing Carbon Catalysts with Enhanced Activity for Oxygen Reduction in Proton Exchange Membrane Fuel Cells

Reduction of NO by activated carbon in the presence of vanadium

Improvement on Hybrid SNCR-SCR Process for NO Control: a Bench Scale Experiment

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