(583da) Effect of CH4 Co-Feeding On Biomass Catalytic Pyrolysis | AIChE

(583da) Effect of CH4 Co-Feeding On Biomass Catalytic Pyrolysis


Du, S. - Presenter, University of Connecticut
Bollas, G., University of Connecticut
Fischer, A., University of Connecticut

Effect of
CH4 Co-feeding on Biomass Catalytic Pyrolysis

Shoucheng Du, Ari Fischer, George M.

Department of Chemical and
Biomolecular Engineering, University of Connecticut, Storrs, CT

During biomass
(catalytic) pyrolysis, a large portion of oxygen atoms are removed from biomass
in the form of H2O, which means that the remaining hydrocarbons are
poor in H atoms. This problem can be addressed by co-feeding of biomass with
hydrogen-rich feedstocks, such as CH4.  Similar concepts have been
explored in literature with co-feeding alcohols in biomass pyrolysis.  Zhang
et al. [1] studied the fast catalytic pyrolysis of wood with
alcohols (methanol, 1-propanol, 1-butanol and 2-butanol) co-feeding in a
fluidized bed reactor. The experimental result showed that the co-feeding of
biomass with alcohols significantly increased carbon yield (aromatics + olefins
+ C5 compounds), especially aromatics yield (from 5.9% to 21.4%).
Based on the H/Ceff ratio hypothesis proposed by Zhang et al. [2], introduction of a hydrogen richer compound (methane)
compared with methanol is preferable.

dehydroaromatization over ZSM-5 is a well-studied process. Mo/ZSM-5 
is  arguably  the  best  catalyst  for  methane aromatization
[3¨C5],  while  comparison  of 
the  efficiency  of  the  process  in 
fixed  and  fluidized bed  reactors [3] shows  that  high  conversions 
are  obtained  at  400-500°C  and WHSVs  in  the
range 1.4-2hr-1. Co-feeding biomass pyrolysis with CH4 using
ZSM-5 with small fractions of Mo additive has the potential to overcome biomass
pyrolysis limitations, resulting in high-quality biofuels.  The objective
of this presentation is to explore the feasibility of improving bio-oil quality
by biomass/CH4 co-pyrolysis using bifunctional catalysts. Mo supported
ZSM-5 catalysts, were formulated using commercial ZSM-5 and the wet impregnation
method.  Experiments were performed in the spouted bed reactor using
biomass model compounds (D-glucose) and pine sawdust. The experimental results
including gas, liquid, and solid analysis for biomass/ZSM-5, biomass/CH4/ZSM-5,
biomass/Mo/ZSM-5 and biomass/CH4/Mo/ZSM-5 will be presented.
Different biomass/CH4 co-feeding ratios will also be investigated
and presented. 


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