Low‐temperature, Low‐Energy, and High‐Efficiency Pretreatment Technology for Large Wood Chips with a Redox Couple Catalyst

Abstract

The pretreatment of lignocellulosic biomass plays a vital role in the conversion of cellulosic biomass to bioethanol, especially for softwoods and hardwoods. Although many pretreatment technologies have been reported so far, only a few pretreatment methods can handle large woodchips directly. To improve the efficiency of pretreatment, existing technologies require the grinding of the wood into small particles, which is an energy-consuming process. Herein, for the first time, we report a simple, effective, and low-temperature (≈100 °C) process for the pretreatment of hardwood (HW) and softwood (SW) chips directly by using a catalytic system of FeCl /NaNO (FCSNRC). The pretreatment experiments were conducted systematically, and a conversion of 71.53 and 70.66 % of cellulose to sugar could be obtained for the direct use of large HW and SW chips. The new method reported here overcomes one of the critical barriers in biomass-to-biofuel conversion, and both grinding and thermal energies can be reduced significantly.

Effect of Fenton pretreatment on enzymatic hydrolysis of poplar

“…The absorbance peak at 1740 cm -1 belongs to hemicellulose carbonyl (Sakuragi et al 2018), so the peak intensity here was positively correlated with the content of hemicellulose in the sample (Gogoi et al 2018). Compared with untreated samples, the absorbance peak strength of poplar samples pretreated with Fenton at 1740 cm -1 significantly weakened, which was caused by the destruction of hemicellulose acetyl in the pretreatment process (Liu et al 2019a).…”

Recent advances in the processing of Napier grass (Pennisetum purpureum Schumach) as a potential bioenergy crop for bioethanol production

“…Among the many available pre-treatment strategies, the alkaline reagent approach stands out as one of the most promising process alternatives. [97]. Hydrothermal pretreatment of sugarcane bagasse at 190℃ 10 min results in yields of glucose recovery in the range of 0.28-0.30 g/g and 0.14 g/g of ethanol, according to research by Ambye-Jensen et al [98].…”

Síntese de novos líquidos iônicos e misturas eutéticas a partir de matérias-primas renováveis para conversão química de biomassa

“…30,31 A estrutura tridimensional da lignina é bastante heterogênea e varia de acordo com o tipo de matriz lignocelulósica. A lignina de folhosas é composta de unidades G e S e traços de unidades H, enquanto a lignina de coníferas é majoritariamente composta por unidades G contendo mais ligações C-C em comparação com ligações C-O-C. 40 No caso de gramíneas, a lignina é composta pelas três unidades. 41 As unidades que caracterizam a lignina do tipo G reagem em grande extensão através de radicais formados no carbono adjacente à hidroxila fenólica formando ligações C-C e C-O.…”