Figure 2From: Elucidating the role of ferrous ion cocatalyst in enhancing dilute acid pretreatment of lignocellulosic biomassFilter paper strips pretreated in pipe reactors at 190°C for five minutes in the presence of 0.5% H 2 SO 4 , 0.5 to 5 mM FeSO 4 or a combination of acidic and salt chemical solutions. All samples were pretreated at the same time.Back to article page