Page 154 - Advances in Eco-Fuels for a Sustainable Environment

Microwave-assisted fast pyrolysis of hazardous waste engine oil into green fuels 125

Table 5.1 Effect of properties on the pyrolysis product

Effect on yield Effect on
with increasing the
value of the reactivity of
Sl. No. Property property char Other comments
1 Heating Decrease the char Reactivity Higher heating rate
rate yield of char activates oxygen and
Increase the gas increased hydrogen content and
and liquid yield due to also increases the
higher surface area and the
heating rate availability of active
sites
2 Pyrolysis Increases gas Decreases CO 2 concentration is
temperature yield; decreases reactivity of decreased by
char yield char increasing pyrolysis
temperature; char
reactivity reduces due
to the enhancement in
the presence of a
larger aromatic ring
and system structural
ordering of the char
by increasing the
temperature of
pyrolysis
3 Pyrolysis Increases the Decreases The decrease of
pressure yield of char and char reactivity of the char
CO 2 ; decreases reactivity with pyrolysis
the yield of CO, pressure is due to the
rise of the char’s
CH 4, and H 2
carbonaceous
structure
4 Residence Increases the Decreases Prolonged heating
time yield of char char reduced reactivity at
reactivity the final temperature
of pyrolysis, which
improves the loss of
active sites and
structural ordering of
the char
5 Biomass No effect No effect The determining
nature parameter is the
initial biomass
pertaining to the
reactivity of the char
as well as its
properties and the
structure of the char