Predicting thermal excursions during in-situ oxidative regeneration of packed bed catalytic fast pyrolysis catalyst

Ex-situ Catalytic Fast Pyrolysis (CFP) uses a secondary reactor to upgrade biomass pyrolysis vapors to stabilized CFP oils with reduced oxygen content. In one configuration, the secondary reactor is operated...

Low-temperature pyrolysis of oily sludge: roles of Fe/Al-pillared bentonites

Pyrolysis is potentially an effective treatment of oily sludge for oil recovery, and the addition of a catalyst is expected to affect its pyrolysis behavior. In the present study, Fe/Al-pillared bentonite with various Fe/Al ratios as pyrolysis catalyst is prepared and characterized by XRD, N2adsorption, and NH3-TPD. The integration of Al and Fe in the bentonite interlayers to form pillared clay is evidenced by increase in the basal spacing. As a result, a critical ratio of Fe/Al exists in the Fe/Al-pillared bentonite catalytic pyrolysis for oil recovery from the sludge. The oil yield increases with respect to increase in Fe/Al ratio of catalysts, then decreases with further increasing of Fe/Al ratio. The optimum oil yield using 2.0 wt% of Fe/Al 0.5-pillared bentonite as catalyst attains to 52.46% compared to 29.23% without catalyst addition in the present study. In addition, the addition of Fe/Al-pillared bentonite catalyst also improves the quality of pyrolysis-produced oil and promotes the formation of CH4. Fe/Al-pillared bentonite provides acid center in the inner surface, which is beneficial to the cracking reaction of oil molecules in pyrolysis process. The present work implies that Fe/Al-pillared bentonite as addictive holds great potential in industrial pyrolysis of oily sludge.

Two-Step Catalytic Pyrolysis of Corn Stover in a Dual Bed Reactor

Experiments on the catalytic pyrolysis of corn stover and catalytic reforming of pyrolysis vapors were conducted in a tubular fixed-bed reactor. The influence of reaction temperature, pyrolysis catalysts, dosage of pyrolysis catalysts and dosage of reforming catalysts were investigated. The results showed that with the increase of reaction temperature, the oil and char yields decreased and the gas yield increased. The highest-quality bio-oil was achieved at the reaction temperature of 400 °C, and dolomite showed a best performance on the biomass pyrolysis compared to other catalysts. Besides, When the dosage of pyrolysis catalyst was 1 g, the relative content of aromatic was 43.92 wt% and the relative content of acids was 47.58 wt%, and when the dosage of reforming catalyst was 2 g, the relative content of aromatic was 34.1 wt% and the relative content of acids was 58.7 wt%.