Regeneration of amorphous NiB/SiO2 catalysts deactivated in cyclopentadiene hydrogenation

Abstract

An amorphous NiB/SiO 2 catalyst, deactivated in the partial hydrogenation of cyclopentadiene to cyclopentene, was regenerated by an oxidation±reduction method. After regeneration, the activity was recovered and the selectivity almost recovered. The data of BET, H 2 uptake and XPS measurements on the regenerated catalyst are almost the same as the original counterpart. XRD and DSC tests revealed that some crystallization had occurred over the regenerated catalyst, which led to the selectivity decreasing slightly. This regeneration was repeated several times, but the structural and chemical properties were nearly the same as after the ®rst operation.

Preparation and catalytic properties of amorphous alloys in hydrogenation of sulfolene

“…Since Smith's first report using amorphous alloy as catalysts in 1980 [1], more and more research work have been done on hydrogenation reactions over amorphous alloys. Up to now, amorphous alloy catalysts have been used in hydrogenation of olefins [2], selective hydrogenation of diene [3][4][5], selective hydrogenation of benzene [6][7][8][9], selective hydrogenation of acetylene in a large excess of ethene [10], hydrogenation of aldehyde and alkones such as furfural [11], glucose [12][13][14] and cinnamaldehyde [15], hydrogenation of nitrobenzene [16,17], selective hydrogenation of nitriles [18][19][20] and hydrogenation of carbon monoxide [21]. In the above reactions, amorphous alloys showed unique catalytic performance, and in many cases they were more active than Raney Ni catalyst.…”

Hydrotreating activity of bulk NiB alloy in model reaction of hydrodenitrogenation of carbazole

“…The transition metal borides, particularly NiB and CoB alloys are well known as a good catalyst for hydrogenation reaction [1][2][3][4][5][6][7]. The process of hydrogenation is needed and widely used in production of fine chemicals, crude oil processing and many other areas.…”