Evaluation of Ba‐promoted Mo carbide catalyst for Fischer–Tropsch synthesis

Journal of Chemical Technology and Biotechnology - Tập 88 Số 7 - Trang 1358-1363 - 2013
Dai‐Viet N. Vo1,2, Viswanathan Arcotumapathy2, Bawadi Abdullah3, Adesoji A. Adesina2
1Chemical Engineering Program Texas A&M University at Qatar P.O. Box 23874 Doha Qatar
2Reactor Engineering & Technology Group, School of Chemical Engineering The University of New South Wales Sydney Australia 2052
3Chemical Engineering Department, Universiti Teknologi PETRONAS, 31750 Tronoh, Perak, Malaysia

Tóm tắt

AbstractBackgroundTraditional FT catalysts such as Co and Fe still suffer from carbon‐induced deactivation even with alkali promotion. The objective of this study was to examine the effect of Ba addition to carbon‐tolerant Mo carbide since it has Pt‐like characteristics and is cheaper than noble metals as an FT catalyst.ResultsThe presence of Ba increased the Mo carbide production rate and reduced the activation energy for its formation. The promoted catalyst exhibited higher specific basic site strength and CO2 uptake for strong basic site than that of the undoped catalyst. Both catalysts exhibited optimal reaction rate at a H2 mole fraction of 0.75 while CO consumption rate, total olefin‐to‐paraffin ratio, methane suppression as well as C5+ selectivity were improved with Ba addition. The non‐standard Anderson–Schulz–Flory (ASF) product distribution observed for the Ba‐doped catalyst may be due to the appearance of an additional polymerization site on the catalyst surface located in the BaMoO4 phase. Chain growth factor was enhanced by up to 93% from 0.43 to 0.83 with the Ba‐doped catalyst.ConclusionsBa promoter increased chain growth probability by about 93%. The deviation of product distribution from standard ASF plots with 2 chain growth factors for the 3wt%Ba‐10%MoC1‐x/Al2O3 catalyst was probably due to the presence of different active sites for chain initiation. The result is unprecedented and represents excellent opportunity for industrial exploitation of a new and relatively cheap carbon‐resistant catalyst.© 2012 Society of Chemical Industry

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Thông tin xuất bản

Journal of Chemical Technology and Biotechnology

Tập 88 Số 7

1358-1363

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