TY  - JOUR
VL  - 88
JF  - Journal of Chemical Technology and Biotechnology
N1  - cited By 8
UR  - https://www.scopus.com/inward/record.uri?eid=2-s2.0-84879212157&doi=10.1002%2fjctb.3984&partnerID=40&md5=b0dae837d62446cb19e174db7d4d20ae
A1  - Vo, D.-V.N.
A1  - Arcotumapathy, V.
A1  - Abdullah, B.
A1  - Adesina, A.A.
Y1  - 2013///
SP  - 1358
AV  - none
ID  - scholars3569
EP  - 1363
SN  - 02682575
N2  - Background: Traditional 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. Results: The 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. Conclusions: Ba promoter increased chain growth probability by about 93. The deviation of product distribution from standard ASF plots with 2 chain growth factors for the 3wtBa-10MoC1-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.
IS  - 7
KW  - Ba-promotion; Catalyst surfaces; Consumption rates; Molybdenum carbide; Product distributions; Production rates; Promoted catalysts; Temperature-programmed carburization
KW  -  Activation energy; Carbides; Carbon; Carbon dioxide; Catalyst deactivation; Catalyst selectivity; Fischer-Tropsch synthesis; Methane
KW  -  Catalyst activity
KW  -  barium; cobalt; molybdenum
KW  -  article; Fischer Tropsch synthesis; physical chemistry; polymerization
TI  - Evaluation of Ba-promoted Mo carbide catalyst for Fischer-Tropsch synthesis
ER  -