NO decomposition over Cu-Sm-ZSM-5 zeolites containing low-exchanged copper

Journal Article · Tue Apr 25 00:00:00 EDT 2000 · Journal of Catalysis

DOI:https://doi.org/10.1006/jcat.2000.2818· OSTI ID:20030526

Parvulescu, V I; Centeno, M A; Grange, P; Delmon, B

Catalysts were prepared by exchange and co-exchange techniques following Iwamoto's procedure. Copper-exchange degree in the zeolites varied between 21.2% and 128% while the Sm content varied in inverse order, between 27.2% and 18.8%. The catalysts were characterized by NO-DRIFT, O{sub 2}-TPD, and XPS. Catalytic tests were performed in a microreactor in the temperature range 673--873 K. It was found that the presence of Cu in close proximity of the Al framework, i.e., in the exchangeable positions, is increased in the presence of Sm. The presence of Sm stabilizes the Cu(I)-O-Cu(II) redox buffer, increasing the activity of this catalyst. This behavior is mainly observable for low Sm concentration.

• Research Organization: Univ. of Bucharest (RO)
• OSTI ID: 20030526
• Journal Information: Journal of Catalysis, Vol. 191, Issue 2; Other Information: PBD: 25 Apr 2000; ISSN 0021-9517
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
01 COAL, LIGNITE, AND PEAT
NITRIC OXIDE
DECOMPOSITION
COPPER
SAMARIUM
ZEOLITES
CATALYTIC EFFECTS
SELECTIVE CATALYTIC REDUCTION
AIR POLLUTION CONTROL