Upgrading the Strategy of Multistage Torrefaction Liquid by the Selective Oxidation Reaction Route Using a Reusable MgO-Based Au/Al2O3 Catalyst,Energy & Fuels

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Upgrading the Strategy of Multistage Torrefaction Liquid by the Selective Oxidation Reaction Route Using a Reusable MgO-Based Au/Al2O3 Catalyst
Energy & Fuels ( IF 5.2 ) Pub Date : 2021-09-21 , DOI: 10.1021/acs.energyfuels.1c02362
Santhanaraj Daniel ₁ , Venkadesh Prasath Subbiah ₁ , Baskar Ramaganthan ₂ , Rajakumar Kanthapazham ₃ , Ramkumar Vanaraj ₄

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The thermal conversion of biomass resource materials into potential bio-oil by either pyrolysis or torrefaction is an attractive process with significant economic concern. However, upgrading the multistage torrefaction liquid products into valuable compounds is the greatest challenge in the biorefinery industry due to the presence of large multiple complex molecules. The product mainly contains a significant portion of acetic acid and furfural at the low-temperature fraction. In this study, we have aimed to upgrade the furfural molecule along with acetic acid by the selective oxidation reaction route. Initially, the Au/Mg(OH)₂ catalyst was employed, and the loss of catalytic activity was observed in a short period due to the instability of the materials in the acidic medium. However, using a sacrificial magnesium oxide (MgO) base with a Au/Al₂O₃ catalyst remarkably improved the oxidation rate and the stability of the material (both in the model compound and torrefaction stream). In every catalytic cycle, the soluble Mg²⁺ ion can be regenerated, and it can be successfully employed for next consecutive reactions. This understanding should help scale up the furoic acid production from the multistage torrefaction liquid.

中文翻译：

使用可重复使用的 MgO 基 Au/Al2O3 催化剂通过选择性氧化反应路线升级多级烘焙液的策略

通过热解或烘焙将生物质资源材料热转化为潜在的生物油是一个具有重大经济意义的有吸引力的过程。然而，由于存在多个复杂的大分子，将多级烘焙液体产品升级为有价值的化合物是生物精炼行业的最大挑战。该产品在低温馏分中主要含有相当一部分的乙酸和糠醛。在这项研究中，我们的目标是通过选择性氧化反应路线将糠醛分子与乙酸一起升级。最初，Au/Mg(OH) ₂使用催化剂，由于材料在酸性介质中的不稳定性，在短时间内观察到催化活性的损失。然而，使用牺牲氧化镁 (MgO) 碱和 Au/Al ₂ O ₃催化剂显着提高了材料的氧化速率和稳定性（在模型化合物和烘焙流中）。在每一个催化循环中，可溶性Mg ²⁺离子都可以再生，并且可以成功地用于接下来的连续反应。这种理解应该有助于扩大多级烘焙液体的糠酸生产。

更新日期：2021-10-07

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