Wj. Wang et al., Regeneration at room temperature for amorphous NiB/SiO2 catalyst deactivated in cyclopentadiene hydrogenation, APP CATAL A, 184(1), 1999, pp. 33-39
The deactivated amorphous NiB/SiO2 catalyst in the selective hydrogenation
of cyclopentadiene (CPD) to cyclopentene (CPE) was regenerated by a new met
hod, base-wash method at room temperature. The base was alkaline-ethanol so
lution. After regeneration, the activity and selectivity were completely re
covered. The results of XRD and DSC measurements showed that the amorphous
structure of the regenerated amorphous catalyst is almost the same as that
of the original counterpart. STEM-EDAX analysis revealed that the surface o
f the deactivated catalyst was covered by carbon. After regeneration, the c
arbon was removed. BET, H-2 chemisorption and XPS tests indicated that the
surface areas and chemical state were held on the renewal catalyst. Such re
generation operation can be repeated several times without significant chan
ges in the structural and chemical properties. (C) 1999 Elsevier Science B.
V. All rights reserved.