901 resultados para Pd black
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The structural evolution of a Pd/C catalyst during the liquid phase selective aerobic oxidation of cinnamyl alcohol has been followed by in situ XAFS and XPS. The fresh catalyst comprised highly dispersed, heavily oxidised Pd particles. Cinnamyl alcohol oxidation resulted in the rapid reduction of surface palladium oxide and a small degree of concomitant particle growth. These structural changes coincided with a large drop in catalytic activity. Prereduced Pd/C exhibited a significantly lower initial oxidation rate demonstrating the importance of surface metal oxide in effecting catalytic oxidation. Use of a Pd black model system confirmed that the oxide→metal transformation was the cause, and not result, of catalyst deactivation.
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Mode of access: Internet.
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A novel.
Estimates and projections of Black and Hispanic personnel in selected health professions, 1980-2000.
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Item 507-J-1
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"November 1980"--Cover.
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Mode of access: Internet.
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Mode of access: Internet.
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Based on the author's thesis.
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Mode of access: Internet.
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"June 1995"--P. 2.
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Mode of access: Internet.
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Mode of access: Internet.
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"The fables contained in this volume were ... published in the State between August 1923 and February 1924."
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Mode of access: Internet.