pyrolysis processes. Cao et al. (2009) examined the co-pyrolysis of
wood biomass and waste tires. It was found that there exists a
hydrogen transfer and a synthetic effect during co-pyrolysis of
the biomass and tires. Bernardo et al. (2012) carried out the experiments
for a multistep upgrading of chars obtained in the co-pyrolysis
of plastic wastes, pine biomass and used tires. Jin et al. (2012)
examined the composition and characteristics of permanent gases
that evolved during co-pyrolysis of sawdust and waste tires.
Although rubber pyrolysis oil has high calorific values, it is difficult
to be converted into diesel because it consists mainly of
hydrocarbon that has a great amount of PAHs, nitrogen and sulfur.
PAHs and nitrogen and sulfur compounds in oil can directly affect
its efficiency of combustion in engine and has a negative environmental
influence (Cao et al., 2009). The previous work regarding
co-pyrolysis of biomass and waste rubber focused on the characteristics
of pyrolysis gas or pyrolysis oil. However, not much discussion
is available on the effect of feedstock on the quality of
pyrolysis vapor and oil. To increase the efficiency of rubber pyrolysis
and improve the combustion performance of pyrolysis oils,
larch sawdust was added into waste rubber pyrolysis. Our hypothesis
was that the adding of sawdust into rubber pyrolysis would
improve the environmental performance of pyrolysis oil by reducing
the contents of PAHs, nitrogen and sulfur. As a result, the adding
of sawdust would make the pyrolysis oil easier to be converted
to bio-diesel that could be further converted to valuable diesel. The
aim of the study is to investigate the influence of adding sawdust
to used tire during pyrolysis on the quality of pyrolysis oil
produced.