Regeneration of Ni/Al{sub 2}O{sub 3} poisoned by thiophene during the selective hydrogenation of styrene
- Inst. de Investigaciones en Catalysis y Petroquimica, Santa Fe (Argentina)
The poisoning by thiophene and the regeneration of a Ni/Al{sub 2}O{sub 3} catalyst during the selective hydrogenation of styrene at 353 K was studied. It was determined by X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy that the sulfur species adsorbed during the catalyst poisoning is thiophene, which is adsorbed coplanarly to the surface. The catalyst was regenerated by H{sub 2} treatments for different times and at several pressures. Part of the sulfur remained irreversibly adsorbed after regeneration, and hence the activity and selectivity values corresponding to the nonpoisoned catalyst were never recovered. After the regeneration treatments at 473 K, a modification on the adsorbed sulfur electronic state was detected, which can be ascribed to thiophene hydrogenolysis, thus producing superficial sulfide adsorbed species.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 183109
- Journal Information:
- Industrial and Engineering Chemistry Research, Journal Name: Industrial and Engineering Chemistry Research Journal Issue: 11 Vol. 34; ISSN 0888-5885; ISSN IECRED
- Country of Publication:
- United States
- Language:
- English
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