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Low-temperature combustion of hydrogen on supported Pd catalysts by Jeffrey F. Kramer; Seyed-A. S. Reihani; Gregory S. Jackson is a scholarly article available to read on EtoBox.

What is Low-temperature combustion of hydrogen on supported Pd catalysts about?

Low-temperature (Ͻ250 ЊC) combustion over Pd catalysts of very lean H 2 /O 2 mixtures diluted in N 2 has been studied experimentally using a microreactor with transient exhaust monitoring using mass spectroscopy. Experimental results using a c-Al 2 O 3 washcoat-supported PdO x catalyst reveal the importance of transient measurements for elucidating features of the catalytic combustion mechanism and, in particular, the effects of H 2 O adsorption/desorption and of the Pd oxidation state. For the cases studied, experiments indicate that H 2 conversion depends on equivalence ratio () only at low temperatures (T in Ͻ 125 ЊC) where conversion remains Ͻ40%. For T in Ͼ 125 ЊC, mass transfer limitations become more significant, and thus, as T in rises, conversion becomes relatively independent of . Addition of H 2 O vapor to the inlet flow causes a reduction in conversion for lower T in , but for T in Ͼ 125 ЊC, it only delays catalyst light-off and the rapid transition to high steady-state conversion. A final set of experiments indicated very high (and apparently steady) H 2 conversion at T in as low as 50 ЊC by starting with a prereduced catalyst. Efforts to understand the experimental re

Author

Jeffrey F. Kramer; Seyed-A. S. Reihani; Gregory S. Jackson

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd; Elsevier BV (ISSN 1540-7489)

Published

2002

Language

EN