id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
cet-10846		cet-10846		6	.pdf	application/pdf	3478	152	51	Given the demand for production and, as mentioned above, an alternative to hydrogen production as a source of clean energy is residual biomass. Finally, it is essential to mention that the pH was adjusted to 5.5, which turned out to be suitable to aid production yields, as several studies have shown that pH between 5 and 6 have been optimal for higher hydrogen production yields (Balachandar et al., 2013).	cache/cet-10846.pdf	txt/cet-10846.txt