Full cost-effective exploitation of all wood components is key to growing a commercially successful biorefining industry. An innovative process is reported that combines fractionation of lignocellulosic biomass using a low-cost ionic liquid (Ionosolv) and production of bio-derived formic acid using polyoxometalates and molecular oxygen (OxFA process). We show that the hemicellulose and part of the lignin were selectively dissolved into the ionic liquid triethylammonium hydrogen sulfate and oxidised in situ to short-chain, distillable carboxylic acids by a Keggin-type polyoxometalate with high yields and selectivities. Characterization by several techniques, including ICP-OES, FTIR, GC, HPLC and NMR spectroscopy confirmed stability of the catalyst over three consecutive POM-Ionosolv recycles and stable formic acid yields.High formic acid yields of 26 % (pine chips), 23 % (beech chips), and 18 % (Miscanthus) were obtained with respect to the initial carbon content of the biomass, with unprecedented oxidation selectivities for formic acid of 54-62 % depending on vanadium substitution in the polyoxometalate, the processing temperature and the water content in the reaction mixture.. We also demonstrate that the cellulose rich pulp is a suitable source of glucose via enzymatic saccharification. We report cellulose yields of 37% for Miscanthus (from originally 48% glucan content), 33% for pine (from originally 49%) and 31% for beech (from originally 41%) were achieved, and a saccharification yield of up to 25% without optimisation. With further optimisation, this concept has the potential to generate two chemical products directly from lignocellulose in high yields and selectivities and hence a novel avenue for full utilisation of cellulose, hemicellulose and lignin.

中文翻译：

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将经济高效的纤维素和短链羧酸生产相结合：多金属氧酸盐（POM）-Ionosolv概念。

对所有木材成分进行充分的成本有效利用是发展商业上成功的生物精炼行业的关键。报道了一种创新方法，该方法结合了使用低成本离子液体（Ionosolv）分离木质纤维素生物质和使用多金属氧酸盐和分子氧生产生物衍生甲酸的方法（OxFA方法）。我们表明，半纤维素和部分木质素被选择性地溶解于离子液体硫酸三乙铵硫酸氢盐中，并被Keggin型多金属氧酸盐原位氧化成短链可蒸馏的羧酸，具有高产率和高选择性。通过多种技术进行的表征，包括ICP-OES，FTIR，GC，HPLC和NMR光谱，证实了催化剂在三个连续的POM-Ionosolv循环中的稳定性以及稳定的甲酸收率。相对于生物质的初始碳含量，获得了高的甲酸收率，分别为26％（松木屑），23％（山毛榉木屑）和18％（Miscanthus），甲酸的空前氧化选择性为54-62％取决于多金属氧酸盐中的钒取代度，加工温度和反应混合物中的水含量。我们还证明了富含纤维素的果肉是酶促糖化的合适葡萄糖来源。我们报告称，芒草的纤维素得率为37％（原葡聚糖含量为48％），松树的纤维素得率为33％（原为49％），山毛榉的纤维素得率为31％（原为41％），糖化率最高为25 ％没有优化。随着进一步的优化，