In:
Progress in Reaction Kinetics and Mechanism, SAGE Publications, Vol. 45 ( 2020-01), p. 146867831989772-
Abstract:
La–Ni–S 2 O 8 2– /ZrO 2 –Al 2 O 3 catalysts were successfully prepared by two different methods of sulfate impregnation, and the physico-chemical properties of the catalysts were characterized by X-ray diffraction, Brunauer–Emmett–Teller analysis, Fourier transform infrared spectroscopy, pyridine adsorption–infrared spectroscopy, and X-ray photoelectron spectroscopy techniques. Catalytic activities were evaluated in a fixed-bed flow reactor using n-pentane isomerization as the probe reaction. Compared with catalyst La–Ni–S 2 O 8 2– /ZrO 2 –Al 2 O 3 -I, prepared by the traditional impregnation method, the catalyst La–Ni–S 2 O 8 2– /ZrO 2 –Al 2 O 3 -W, prepared by the incipient-wetness impregnation method, possessed higher pore volume, pore size, sulfur content, and stronger Brønsted acid sites. The catalytic activity for La–Ni–S 2 O 8 2– /ZrO 2 –Al 2 O 3 -W was maintained at around 56% within 3000 min with an isopentane selectivity of 88% which showed much greater stability than that of La–Ni–S 2 O 8 2– /ZrO 2 –Al 2 O 3 -I. This can be attributed to the fact that (1) the large pore size and pore volume of La–Ni–S 2 O 8 2– /ZrO 2 –Al 2 O 3 -W can largely suppress carbon deposition and (2) the more numerous and stronger Brønsted acid sites for La–Ni–S 2 O 8 2– /ZrO 2 –Al 2 O 3 -W guaranteed to provide enough acid sites for isomerization during the reaction process.
Type of Medium:
Online Resource
ISSN:
1468-6783
,
1471-406X
DOI:
10.1177/1468678319897724
Language:
English
Publisher:
SAGE Publications
Publication Date:
2020
detail.hit.zdb_id:
2018085-8
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