Other non-zeolite catalysts employed include those based on
supported transition metals like cobalt and rhenium and ammonium 12-tungstophosphates (Hayashi and Moffat, 1983; Mauldin,
1986). They are known for the production of C10 and linear alkanes in addition to olefin compounds (Mauldin, 1986). Majority of the non-zeolite catalysts employed for gasoline synthesis from
methanol or directly from the syngas have so far received limited
industrial consideration due to some vital reasons. Difficulty in
achieving excellent yield of gasoline range paraffins due to associated side reactions is a forefront issue. Acidity control and catalyst
deactivation with time due to coke deposition or active sites
poisoning is another great challenge. Compounds based on halides
(like zinc iodide) are corrosive and difficult to be regenerated. Other
issues include sintering and environmental disposal problems.
These challenges accounted for a shift to the zeolitic and analog
catalysts.