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Direct conversion of synthesis gas to aromatic hydrocarbons: Variation of product distribution with time‐on‐stream
Author(s) -
Varma R. L.,
Jothimurugesan K.,
Bakhshi N. N.,
Mathews J. F.,
Ng S. H.
Publication year - 1986
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450640120
Subject(s) - product distribution , catalysis , coke , syngas , zeolite , chemical engineering , cobalt , molecular sieve , chemistry , hydrocarbon , nickel , materials science , inorganic chemistry , organic chemistry , engineering
The synthesis of hydrocarbons from syngas was studied over a zirconia‐based cobalt‐nickel catalyst (FT catalyst) alone as well as mixed with zeolite HZSM‐5 at 101.3 kPa in a 12.7 mm i.d. down flow reactor. The product distribution was recorded as a function of time‐on‐stream for several days of continuous operation under fixed operating conditions of 250°C and H 2 /CO = 1. For the FT + HZSM‐5 system, a dramatic variation in the product distribution takes place during the first 24 h of operation. A comparison of time‐on‐stream results obtained using FT catalyst alone and mixed with HZSM‐5 suggests that the reactions leading to the build‐up of overall product distribution are slower over HZSM‐5 compared to those taking place over FT catalyst. These differences have been attributed to the different nature of reactions taking place over the two components of the mixed catalyst system. Analyses of the coke on the deactivated catalysts are also reported.