30-P-34-Selective reduction of NO to N2 in the presence of oxygen

Furusawa, Takeshi; Seshan, Kulathuiyer; Maisuls, Sergio; Lercher, Johannes A.; Lefferts, Leon; Aika, Ken‐ichi

doi:10.1016/s0167-2991(01)81755-9

Cited by 4 publications

(4 citation statements)

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“…The production of NO 2 is observed after the C 3 H 6 conversion reaches 100% and this trend is similar to Co-ZSM5 (38.5) in Fig. 6 reported earlier [27]. N 2 is the main product over this catalyst in the range of reaction temperature from 473 to 548 K, however, NO 2 is the main product above 573 K where C 3 H 6 starts to be oxidized completely.…”

Section: Selective Reduction Of No With Propylene or Methane Over Co ...supporting

confidence: 85%

Selective reduction of NO with propylene in the presence of oxygen over Co- and Pt-Co promoted HY

Furusawa

Seshan

Lefferts

et al. 2002

Applied Catalysis B: Environmental

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Section: Selective Reduction Of No With Propylene or Methane Over Co ...supporting

confidence: 85%

Selective reduction of NO with propylene in the presence of oxygen over Co- and Pt-Co promoted HY

Furusawa

Seshan

Lefferts

et al. 2002

Applied Catalysis B: Environmental

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“…However, it was shown by XPS analysis that the surface of the silver particles and clusters was partially oxidised. It has been reported that oxidised silver species are highly selective for N 2 formation [19][20][21], hence it may be that it is silver oxide species that facilitate the production of N 2 .…”

Section: Reaction Selectivitymentioning

confidence: 99%

Silver Modified Degussa P25 for the Photocatalytic Removal of Nitric Oxide

Bowering

Croston

Harrison

et al. 2007

International Journal of Photoenergy

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A study of the photocatalytic behaviour of silver modified titanium dioxide materials for the decomposition and reduction of nitric oxide (NO) gas has been carried out. The effects of silver loading, calcination temperature, and reaction conditions have been investigated. Prepared photocatalysts were characterised using XRD, TEM, and XPS. A continuous flow reactor was used to determine the photocatalytic activity and selectivity of NO decomposition in the absence of oxygen as well as NO reduction using CO as the reducing agent, over the prepared photocatalysts. XRD and TEM analysis of the photocatalysts showed that crystalline silver nitrate particles were present on the titanium dioxide surface after calcination at temperatures of up to200∘C. The silver nitrate particles are thermally decomposed to form metallic silver clusters at higher temperatures. XPS analysis of the photocatalysts showed that for each of the temperatures used, bothAg+andAg0were present and that theAg0/Ag+ratio increased with increasing calcination temperature. The presence of metallic silver species on theTiO2surface dramatically increased the selectivity forN2formation of both decomposition and reduction reactions. When CO was present in the reaction gas, selectivities of over 90%were observed for all the Ag-TiO2photocatalysts that had been calcined at temperatures above200∘C. Unfortunately these high selectivities were at the expense of photocatalytic activity, with lower NO conversion rates than those achieved over unmodifiedTiO2photocatalysts.

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“…Since the early work of Iwamoto et al 1 and Held et al 2 with Cu-ZSM-5, silver supported on alumina has been reported to be an active and stable catalyst for selective catalytic reduction of nitrogen oxides with various hydrocarbons (HC-SCR). [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] Discussions have occurred about the optimal silver loading on the alumina support. It has been shown that the best catalytic performance is obtained at low and intermediate silver loadings (1.2-3 wt %), while higher amounts of silver lead to undesired total combustion of hydrocarbons.…”

Section: Introductionmentioning

confidence: 99%

Structure−Activity Relationship in HC-SCR of NO_x by TEM, O₂-Chemisorption, and EDXS Study of Ag/Al₂O₃

et al. 2005

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Ag/alumina catalysts with different silver loading (1.28-6 wt %) for lean NO reduction activity were prepared by impregnation and the incipient wetness method. Complementary HRTEM, HAADF, O2-chemisorption, and EDXS studies were applied to investigate the dependence between silver particle size and catalytic activities of the prepared materials. The catalyst with the lowest silver loading (1.28 wt %) was found to be the most active catalyst in terms of reacted NO molecules per mole of silver. On the basis of the HRTEM, HAADF, and O2-chemisorption studies it could be concluded that the mean particle size or particle size distribution of the samples alone could not explain the big difference in the activities. EDXS analyses showed on the other hand that all of the samples were very heterogeneous in terms of particle size distribution, e.g., including both small and very big particles. Furthermore, both metallic silver and mainly hexagonal silver oxide (Ag2O) were found to be present in the samples. Despite the valuable information provided by ex situ characterization of the prepared samples, it needs to be emphasized that establishing a structure-reactivity relationship for this type of catalyst requires in situ characterization.

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30-P-34-Selective reduction of NO to N2 in the presence of oxygen

Cited by 4 publications

References 0 publications

Selective reduction of NO with propylene in the presence of oxygen over Co- and Pt-Co promoted HY

Selective reduction of NO with propylene in the presence of oxygen over Co- and Pt-Co promoted HY

Silver Modified Degussa P25 for the Photocatalytic Removal of Nitric Oxide

Structure−Activity Relationship in HC-SCR of NO_x by TEM, O₂-Chemisorption, and EDXS Study of Ag/Al₂O₃

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30-P-34-Selective reduction of NO to N2 in the presence of oxygen

Cited by 4 publications

References 0 publications

Selective reduction of NO with propylene in the presence of oxygen over Co- and Pt-Co promoted HY

Selective reduction of NO with propylene in the presence of oxygen over Co- and Pt-Co promoted HY

Silver Modified Degussa P25 for the Photocatalytic Removal of Nitric Oxide

Structure−Activity Relationship in HC-SCR of NOx by TEM, O2-Chemisorption, and EDXS Study of Ag/Al2O3

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Structure−Activity Relationship in HC-SCR of NO_x by TEM, O₂-Chemisorption, and EDXS Study of Ag/Al₂O₃