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The deactivation of Pd/SiO 2 and Ag-promoted Pd/SiO 2 catalysts was monitored during their use in the selective hydrogenation of acetylene. Based on the analysis of green oil accumulated on the deactivated Pd/SiO 2 catalysts, it was proposed that the catalyst deactivation proceeded in three stages. In the initial stage (Stage I), a large amount of relatively light green oil...
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...
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