Catalytic behaviors of multi-valent lanthanide oxides. Progress report, September 1, 1981-October 31, 1982

Technical Report · Fri Jan 01 04:00:00 EST 1982

OSTI ID:6614719

Rosynek, M P

The overall objective of this project during the past four years has been to elucidate the chemical/structural natures and modes of generation of catalytically active sites on lanthanide oxide surfaces by systematically characterizing the behaviors of these materials for certain diagnostic probe reactions. An additional aim has been to identify correlations that may exist between catalytic behaviors and periodic trends in the chemical and/or physical properties of the rare earth oxides. We have made substantial progress toward the attainment of these goals, and have now essentially completed one important phase of the project. Our investigations have established, for example, that at least two types of dissimilar catalytic sites exist on several of the lighter lanthanide sesquioxides, viz., those of lanthanum, praseodymium, and neodymium, and that such sites can effectively influence each other via the transport of surface intermediates that are generated during certain multi-pathway reactions, such as alcohol dehydration/dehydrogenation. As a result, a relatively complex, but very revealing, picture has emerged regarding the generation, nature, and behavior of catalytic sites on these rare earth oxides. The postulated interpretation may, in fact, have considerably broader applicability in fostering an increased understanding of basic metal oxide catalysts in general. This progress report is largely derived from a detailed manuscript, entitled The Nature of Catalytic Sites on Lanthanum and Neodymium Oxides for Dehydration/Dehydrogenation of Ethanol, which has recently been submitted for publication to the Journal of Catalysis. This document effectively summarizes our current understanding of these oxide catalysts that has resulted from this DOE-funded project. 16 figures, 2 tables.

• Research Organization: Texas A and M Univ., College Station (USA). Dept. of Chemistry
• DOE Contract Number: AS05-78ER06042
• OSTI ID: 6614719
• Report Number(s): DOE/ER/06042-T1; ON: DE83003139
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
400301 -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ALCOHOLS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DATA
DEHYDRATION
DEHYDROGENATION
ETHANOL
EXPERIMENTAL DATA
HYDROXY COMPOUNDS
INFORMATION
KINETICS
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
REACTION KINETICS
RESEARCH PROGRAMS