Effects of Na, Cu, Ni and Co Modifications on the Activity and Characteristics of Rh/Al2O3 Catalysts for NO Reduction

Chang, Fu‐Min; Chen, Jyh-Cherng; Wey, Ming‐Yen

doi:10.1007/s10562-008-9608-0

Cited by 5 publications

(2 citation statements)

References 15 publications

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“…Selective catalytic reduction (SCR) has been an attractive method for NO reduction because of its high control efficiency, low reaction temperature, and low energy/fuel requirement. Many studies have applied SCR for NO reduction and the feasible catalysts include transition metal catalysts (Cu, Fe, V, Co and Ni) supported by activated carbon [1,2], noble metal catalysts (Pd-Rh) supported on alumina [3] and some combined/modified metal catalysts (Pd-Na and Rh-Na) [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…The effects of H 2 O on Rh-catalysts and modified Rh-catalysts in oxygen positive conditions similar to the incineration flue gas have not yet investigated. Our group has previously studied the performance of the Rh/Al 2 O 3 catalyst on NO reduction and its modification by adding Na [5,6]. The characterization of Rh/Al 2 O 3 and Rh-Na/Al 2 O 3 catalysts before and after the reaction have been carried out, including the dispersion of Rh and Na, BET surface area, the oxidation state of Rh, etc.…”

Section: Introductionmentioning

confidence: 99%

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Improving the Activity of Rh/Al2O3 Catalyst for NO Reduction by Na Addition in the Presences of H2O and O2

2009

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The effect of Na addition on the performance of Rh/Al 2 O 3 catalyst for NO reduction with CO in the presence of H 2 O and O 2 was investigated. The reacted catalysts were analyzed by the FTIR technique to identify the products for further investigation on the possible catalytic reaction mechanisms and the reasons behind the H 2 O poisoning. Experimental results show that the removal efficiency of NO by Rh/Al 2 O 3 catalyst was 63% at 250°C but that decreased as the H 2 O content increased. Adding Na to modify the Rh/Al 2 O 3 catalyst significantly enhanced the conversion of NO to 99% at 250-300°C even as the H 2 O content was 1.6 vol%. The FTIR analyses results reveal that the abundant H 2 O in the flue gas can compete with NO to adsorb on the surfaces of Rh/Al 2 O 3 and Rh-Na/ Al 2 O 3 catalysts and further enhance the formation of NO 3 that reacts with H. The effects of H 2 O on Rh/Al 2 O 3 and Rh-Na/Al 2 O 3 catalysts can be eliminated by increasing the reaction temperature to higher than 300°C. Rh-Na/Al 2 O 3 is a feasible catalyst for NO reduction at such condition with relative high H 2 O and O 2 contents.

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