Active Catalysts for the NO x Reduction in a FCC unit

Abstract

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.

NO reduction by CO over a Fe-based catalyst in FCC regenerator conditions

“…Reduction of NO x by CO would be an efficient way due to it generated in the dense bed of the FCC regenerator. Unfortunately, in the presence of excessive O 2 , the reaction activities of many high performance active catalysts become lower [18,19], such as noble metal-based additives [20][21][22][23][24][25][26], MCM-36 [27], and Cu-Ce or Mg-Al mixed oxides [28][29][30][31]. Recently we reported a simple NO x reduction technology using a novel multi-redox-stage regenerator that just needs a modification of the regenerator configuration [32].…”

On the role of Pd β-hydride in the reduction of nitrate over Pd based catalyst

“…The most promising technique for nitrate removal seems to be the catalytic hydrogenation over a solid catalyst. In this context, bimetallic palladium based supported catalysts have been extensively studied [4][5][6][7][8][9][10][11][12][13][14][15].…”

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

“…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.…”