With the globalization of the increasing demand for energy,
energy shortage is a common worldwide problem. It is predicted
that the growth in the production of easily accessible oil and gas
will not match the projected rate of demand by 2040e2050, since
the level of oil demand will increase from 85 Mb$day1 in 2008 to
105 Mb$day1 in 2030 and to higher values thereafter [13], whilst
the number of vehicles will increase to 1.3 billion by 2030 and to 2
billion by 2050 [14]. In addition, concerns towards CO2 emissions