TY - JOUR
T1 - Novel derivatives of MCM-36 as catalysts for the reduction of nitrogen oxides from FCC regenerator flue gas streams
AU - Barth, Jan Olaf
AU - Jentys, Andreas
AU - Iliopoulou, Eleni F.
AU - Vasalos, Iacovos A.
AU - Lercher, Johannes A.
N1 - Funding Information:
Financial support of the European Union (Project G1RD-CT99-0065-“DENOXPRO”) is gratefully acknowledged. The authors thank Dr. H. Rhemann (OMV), Dr. R. Harding, Dr. J. Nee, and Dr. G. McElhiney (GRACE-Davison) for helpful discussions concerning FCC deNO x technologies.
PY - 2004/10/1
Y1 - 2004/10/1
N2 - MCM-36 materials containing mixed oxide pillars (MgO-Al 2O 3-MCM-36, BaO-Al 2O 3-MCM-36, MgO-Al 2O 3SiO 2-MCM-36, BaO-Al 2O 3SiO 2-MCM-36) were investigated as additives for the in situ reduction of NO x formed during the regeneration of coked cracking catalysts in FCC units. The additives were investigated under reaction conditions similar to the oxygen-depleted and the oxygen-enriched zone of the FCC regenerator. MCM-36-type materials with basic mixed oxide clusters in the interlayer galleries showed high NO conversions (∼85%) and high N 2 yields (∼80%) under oxygen-deficient reaction conditions. The catalytic activity of MCM-36 with alkaline earth metal aluminum oxide pillars incorporated between the zeolitic layers was higher (MgO-Al 2O 3-MCM-36: 77% N 2 yield at 650°C) compared to the nonpillared parent material MCM-22 (22%). The materials have been added in regeneration experiments to industrial (coked) FCC catalysts in a fluidized-bed reactor. The materials led to a reduction of NO emissions also in the presence of Pt-based CO combustion promoters (∼30% NO reduction). It is speculated that Brønsted acid sites in the zeolite layers of the composite materials catalyze the reduction of NO with NH 3, which is an intermediate in the regeneration of nitrogen-containing carbonaceous deposits on deactivated FCC catalysts.
AB - MCM-36 materials containing mixed oxide pillars (MgO-Al 2O 3-MCM-36, BaO-Al 2O 3-MCM-36, MgO-Al 2O 3SiO 2-MCM-36, BaO-Al 2O 3SiO 2-MCM-36) were investigated as additives for the in situ reduction of NO x formed during the regeneration of coked cracking catalysts in FCC units. The additives were investigated under reaction conditions similar to the oxygen-depleted and the oxygen-enriched zone of the FCC regenerator. MCM-36-type materials with basic mixed oxide clusters in the interlayer galleries showed high NO conversions (∼85%) and high N 2 yields (∼80%) under oxygen-deficient reaction conditions. The catalytic activity of MCM-36 with alkaline earth metal aluminum oxide pillars incorporated between the zeolitic layers was higher (MgO-Al 2O 3-MCM-36: 77% N 2 yield at 650°C) compared to the nonpillared parent material MCM-22 (22%). The materials have been added in regeneration experiments to industrial (coked) FCC catalysts in a fluidized-bed reactor. The materials led to a reduction of NO emissions also in the presence of Pt-based CO combustion promoters (∼30% NO reduction). It is speculated that Brønsted acid sites in the zeolite layers of the composite materials catalyze the reduction of NO with NH 3, which is an intermediate in the regeneration of nitrogen-containing carbonaceous deposits on deactivated FCC catalysts.
KW - Fluid catalytic cracking (FCC)
KW - NO reduction
KW - Oxidative regeneration
KW - Pillared zeolites
UR - http://www.scopus.com/inward/record.url?scp=4344650072&partnerID=8YFLogxK
U2 - 10.1016/j.jcat.2004.06.021
DO - 10.1016/j.jcat.2004.06.021
M3 - Article
AN - SCOPUS:4344650072
SN - 0021-9517
VL - 227
SP - 117
EP - 129
JO - Journal of Catalysis
JF - Journal of Catalysis
IS - 1
ER -