ISSN:
1572-879X
Keywords:
Palladium
;
lanthanum
;
lanthanum oxide
;
lanthanum aluminum oxide
;
α-alumina
;
X-ray diffraction (XRD)
;
temperature-programmed reduction (TPRd)
;
nitric oxide
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract The objective of this study is to investigate the structure of the Pd-La/α-Al2O3 catalyst. X-ray diffraction (XRD) and temperature-programmed reduction (TPRd) were used as characterization techniques. Contrary to the assertions in the literature, XRD studies conducted on La/α-Al2O3 composite oxides and Pd-La/α-Al2O3 catalysts show that Pd catalyzes the solid state reaction between A12O3 and Al2O3 to form LaAlO3. TPRd studies conducted on Pd/α-Al2O3, Pd/La2O3, Pd/LaAlO3, and Pd-La/α-Al2O3 catalysts suggest that Pd in the Pd-La/α-Al2O3 catalyst interacts more strongly with LaAlO3 than with α-Al2O3. Reaction studies were conducted to investigate the activity of Pd/α-Al2O3, Pd/La2O3, Pd/LaA103, and Pd-La/α-Al2O3 catalysts for nitric oxide (NO) reduction. These studies show that Pd/LaAlO3 catalysts are most active for NO removal at stoichiometric and under net reducing conditions.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00764344
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