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Formation of C4 species in the deactivation of a Pd/SiO2 catalyst during the selective hydrogenation of acetylene by In Young Ahn; Ji Hoon Lee; Sang Seop Kum; Sang Heup Moon is a Materials Science article available to read on EtoBox.

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The deactivation characteristics of Pd/SiO 2 in the selective hydrogenation of acetylene were correlated with changes in the amount of the C4 species produced. The amounts of butenes produced changed in parallel with the catalyst activity, indicating that the rate limiting step for butene production was the same as that for acetylene hydrogenation. On the other hand, the amount of 1,3-butadiene produced changed, showing a maximum with catalyst deactivation because 1,3-butadiene is an intermediate in the sequential reaction process which involves both the production and consumption of 1,3-butadiene. This was verified by a simultaneous TG/reaction experiment showing that 1,3-butadiene was a precursor of green oil. The catalyst showed a self-regenerative behavior in its activity and the amounts of C4 species produced during the early stage of deactivation because two opposite factors, which contributed to either the lowering or the promotion of activity, were involved in the process. A specific type of polymer species, produced during the initial period of deactivation, is proposed to be responsible for the promotion of catalyst activity.

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Author

In Young Ahn; Ji Hoon Lee; Sang Seop Kum; Sang Heup Moon

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0920-5861)

Published

2007

Language

EN

Field

Materials Science (Physical Sciences)