Ir-based additives for NO reduction and CO oxidation in the FCC regenerator: Evaluation, characterization and mechanistic studies

Iliopoulou, Eleni F.; Efthimiadis, Evangelos A.; Nalbandian, L.; Vasalos, I.A.; Barth, J.-O.; Lercher, Johannes A.

doi:10.1016/j.apcatb.2005.03.011

Cited by 53 publications

(45 citation statements)

References 48 publications

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“…Other additives based in Rh or Ir have also been proposed for the NO x removal in the FCC units [3,11,12]. Recently some derivatives of MCM-36 [13] and Cu-Ce-Al complex oxides [14,15], have been studied showing interesting results, nevertheless more active materials are necessary.…”

Section: Introductionmentioning

confidence: 98%

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Active Catalysts for the NO x Reduction in a FCC unit

2009

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Additives, without noble metals, based in CeAl mixed oxides supported on c-alumina have been investigated as potential catalysts for the NO x reduction in the FCCU regenerator. The best results were obtained with clusters of Sn-Cu-Al-O interacting with Ce-Al mixed oxides highly dispersed on the c-Al 2 O 3 . The strong interaction between the two complex oxides provides a stable catalyst with high activity at high temperature. These additives would be active in the dense phase of the FCC regenerator, being deactivated at oxygen concentrations higher than 2%, but they would be regenerated in the FCC reactor.

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Section: Introductionmentioning

confidence: 98%

“…In these plants, NO x are mainly formed in the fluid catalytic cracking (FCC) units. Current regulations controlling such pollution are becoming more stringent and new processes to control these contaminants are imperative [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Active Catalysts for the NO x Reduction in a FCC unit

2009

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“…The Rh-catalyst is known as one of the most active catalysts for the SCR of NO. Rhodium is widely developed and applied in threeway-catalysts (TWCs) to control the exhaust of gasoline vehicles [5]. In recent years, several studies have addressed the improvement of Rh-catalyst activity through modification of metals (e.g., Zn, Na, W, Co, Ag) [6][7][8][9][10][11], as shown in Table 1.…”

Section: Introductionmentioning

confidence: 99%

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

2008

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This study used different metals to modify Rh/ Al 2 O 3 catalysts for NO reduction in a simulated waste incineration flue gas containing 6% O 2 . The characteristics of the modified catalysts were analyzed using BET, TEM and XRD. The results of the experiment reveal that Na addition can significantly affect the properties of Rh/Al 2 O 3 catalysts on the BET surface area and Rh metal dispersion. Furthermore, Na addition was found to significantly enhance the NO conversion of Rh/Al 2 O 3 at 250-350°C. On the contrary, Cu, Ni, and Co addition was found to have slight suppression effects.

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“…In this way, additives based on Rh or Ir [2,[12][13], some derivatives of MCM-36 [14] and CuCe-Al complex oxides [15][16], have been proposed as active materials for the NO x removal in the FCC units showing interesting results. Also, Mg-Al mixed oxides produced from layered double hydroxides (LDHs) are active catalysts for the simultaneous removal of NO x and SO 2 in the FCC [6,17], nevertheless more active materials are necessary.…”

Section: Introductionmentioning

confidence: 99%

“…The NO x emissions in the European Union have decreased by almost 40% since 1990, but they are projected to be 6 percent above the aggregated Member State ceilings and 16 percent above the stricter ceiling for the European Community as a whole set for 2010. Current regulations controlling such pollution are becoming more stringent and new processes to control these pollutants are imperative [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

NOx selective catalytic reduction at high temperatures with mixed oxides derived from layered double hydroxides

et al. 2012

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ElsevierPalomares Gimeno, AE.; Franch Martí, C.; Ribera, A.; Abellán, G. (2012) Mixed oxides derived from Layered Double Hydroxides (LDHs) have been investigated as potential catalysts for the NO x removal at high temperatures. The best results were obtained with Co-Al mixed oxides derived from LDHs that are active at 750ºC in the presence of oxygen and water. These catalysts could reduce or/and decompose the NO x formed in the dense phase of the FCC regenerator, being deactivated at oxygen concentrations higher than 1.5%.Nevertheless this deactivation is not permanent and they would be regenerated after reduction with hydrogen at 530ºC. The influence of the layered double hydroxides (LDHs) preparation method on the catalyst activity was studied, observing that the activity of the catalyst depends on its chemical composition but it does not depend on the initial LDHs crystallinity, obtaining similar results independently of the synthesis method.

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Ir-based additives for NO reduction and CO oxidation in the FCC regenerator: Evaluation, characterization and mechanistic studies

Cited by 53 publications

References 48 publications

Active Catalysts for the NO x Reduction in a FCC unit

Active Catalysts for the NO x Reduction in a FCC unit

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

NOx selective catalytic reduction at high temperatures with mixed oxides derived from layered double hydroxides

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