Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, Newmark Lab, 205 N. Mathews Ave., Urbana, IL 61801, United States.
Bioresour Technol. 2012 Apr;110:278-87. doi: 10.1016/j.biortech.2012.01.133. Epub 2012 Feb 8.
Combined acid catalysis was employed as a pretreatment alternative with combined acid catalysts blending sulfuric acid with two biomimetic acids, trifluoroacetic acid (TFA) and maleic acid (MA), respectively. The influences of acid blending ratio, temperature, and acid dosage on pretreatment performance were investigated. A synergistic effect on hemicellulose decomposition was observed in the combined acid hydrolysis, which greatly increased xylose yield, although TFA/MA would induce more total phenols. Besides, combined TFA pretreatment could efficiently prevent xylose degradation. Fermentation tests of the acid-catalyzed hydrolysates with overliming showed that compared to H(2)SO(4) pretreatment, TFA and MA pretreatments improved overall ethanol yield with an increase by 27-54%. Combined acid catalysis was shown as a feasible pretreatment method for its improved sugar yield, reduced phenols production and catalyst costs.
采用混合酸催化作为预处理替代方法，分别将硫酸与两种模拟酸（三氟乙酸（TFA）和马来酸（MA））混合作为混合酸催化剂。考察了酸混合比、温度和酸用量对预处理性能的影响。在组合酸水解中观察到半纤维素分解的协同效应，尽管 TFA/MA 会导致更多的总酚，但大大提高了木糖的得率。此外，组合 TFA 预处理可以有效地防止木糖降解。用过石灰处理酸催化水解物的发酵试验表明，与 H(2)SO(4)预处理相比，TFA 和 MA 预处理提高了整体乙醇得率，增加了 27-54%。混合酸催化因其提高的糖产率、减少的酚产量和催化剂成本而显示出作为一种可行的预处理方法。
