ef6b01726_si_001.pdf (60.91 kB)
Characteristics of Particles in Pyrolysis Oil
journal contribution
posted on 2016-09-20, 00:00 authored by Roger Molinder, Linda Sandström, Henrik WiinikkaParticles filtered out of pyrolysis
oil produced through fast pyrolysis
of stem wood, willow, reed canary grass, bark, and forest residue
were characterized using scanning electron microscopy and energy-dispersive
spectroscopy with the aim of identifying particle categories and discussing
transport mechanisms of particles and inorganics into the oil. Particles
filtered out of both the condensed and the aerosol fractions of the
oil displayed three types of morphology: (i) char-like structures
(1–15 μm), (ii) spheres (100 nm to 1 μm), and (iii)
irregularly shaped residue (50–500 nm). The char-like structures
were identified as char. The spheres and irregularly shaped residue
shared morphology and composition with tar balls and organic particles
with inorganic inclusions. These particles could have formed either
during the fast pyrolysis stage or through precipitation from the
oil during storage. All particles consisted mainly of C and O but
also small amounts of inorganics. The particles from the aerosol fraction
of the oil had higher inorganics content than the particles from the
condensed fraction. The results were discussed, and suggested transport
mechanisms of inorganics into particles were presented.