Regeneration of the amorphous NiB/SiO2 catalyst poisoned by carbon disulfide in cyclopentadiene hydrogenation

The amorphous NiB/SiO2 catalyst was deactivated in partial hydrogenation of cyclopentadiene (CPD) containing 1000 ppm of carbon disulfide. After the r eactivity had vanished, the catalyst was almost completely recovered by seq uential base-wash and H-2-sweep treatments. The base was alkaline ethanol. The results of XRD, DSC, XPS, EXAFS, IR, SEM-EDX, and H-2 uptake measuremen ts on the regenerated amorphous catalyst were almost the same as those on o riginal counterparts. The regeneration operation was repeated several times , but its structural and chemical properties remained. (C) 2000 Elsevier Sc ience B.V. All rights reserved.