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- Title
Bimetallic Bi‐Ni oxides over carbide supports for oxidative dehydrogenation of <italic>n</italic>‐butane: Experimental and kinetic modelling.
- Authors
Elmutasim, Omer; Tanimu, Gazali; Aljundi, Isam H.; Al‐Khattaf, Sulaiman
- Abstract
Abstract: <italic>n</italic>‐butane oxidative dehydrogenation was studied over Bi‐Ni/TiC, Bi‐Ni/SiC, Bi‐Ni/Silicalite‐1, and unsupported Bi‐Ni catalyst. The co‐impregnation technique was followed, with fixed 0.30 and 0.20 g/g for Bi and Ni respectively. The physico‐chemical properties were measured by means of BET, XRD, CO2/NH3‐TPD, and H2‐TPR techniques. The catalytic test results revealed that bimetallic Bi‐Ni/TiC catalyst exhibited the highest <italic>n</italic>‐butane conversion of 16.6 % with dehydrogenation selectivity of 83.7 % (1,3‐butadiene and butenes selectivity of 50.7 % and 33 % respectively). As regards Bi‐Ni/TiC catalyst, the main operating parameters including O2/n‐C4H10 feed ratio, space velocity, and reaction temperature were varied. The Bi‐Ni/TiC catalyst showed adequate stability for a 10 h time on stream test. The high performance of Bi‐Ni‐O/TiC catalyst is attributed to the synergistic role of reducibility, presence of strong basic sites and weak acidic sites, and an increased metal species dispersion over the TiC support. A kinetic study of <italic>n</italic>‐butane oxidative dehydrogenation was carried out. The apparent activation energy for formation of butadiene was estimated to be the lowest (15 kJ/mol), while the highest activation energy (105 kJ/mol) is required for the undesirable cracking reaction.
- Subjects
DEHYDROGENATION; CHEMICAL reactions
- Publication
Canadian Journal of Chemical Engineering, 2018, Vol 96, Issue 6, p1367
- ISSN
0008-4034
- Publication type
Article
- DOI
10.1002/cjce.23123