Coupling hydropyrolysis and vapor-phase catalytic hydrotreatment to produce biomethane from pine sawdust,Bioresource Technology

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Coupling hydropyrolysis and vapor-phase catalytic hydrotreatment to produce biomethane from pine sawdust
Bioresource Technology ( IF 9.7 ) Pub Date : 2023-07-07 , DOI: 10.1016/j.biortech.2023.129472
Jia Wang ₁ , Jianchun Jiang ₁ , Xianzhi Meng ₂ , Arthur J Ragauskas ₃

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This study investigated hydropyrolysis and subsequent vapor-phase hydrotreatment over a NiAl2O4 catalyst to produce biomethane (CH4) from pine sawdust. The non-catalytic pressurized hydropyrolysis generated tar, CO2, and CO as the primary products. However, using a NiAl2O4 catalyst in the second-stage reactor significantly increased the formation of CH4 and reduced CO and CO2 in gas products. The catalyst also fully converted tar intermediates to produce CH4, resulting in a maximum carbon yield of 77.7% with 97.8% selectivity. The temperature plays a crucial role in CH4 generation, with both its yield and selectivity showing a positive correlation with the reaction temperature. Increasing the reaction pressure from 0.2 to 1.2 MPa notably inhibited the production of CH4, leading to a shift towards cycloalkanes due to a competitive reaction. This tandem approach shows great potential as an innovative technique for producing alternative fuels from biomass wastes.

中文翻译：

耦合加氢热解和气相催化加氢处理，从松木屑中生产生物甲烷

本研究研究了通过 NiAl2O4 催化剂进行加氢热解和随后的气相加氢处理，以从松木屑中生产生物甲烷（CH4）。非催化加压加氢热解产生焦油、CO2 和 CO 作为主要产物。然而，在第二级反应器中使用 NiAl2O4 催化剂显著增加了 CH4 的形成，并减少了气体产品中的 CO 和 CO2。该催化剂还完全转化焦油中间体生成 CH4，最大碳收率为 77.7%，选择性为 97.8%。温度在 CH4 生成中起着至关重要的作用，其产率和选择性都与反应温度呈正相关。将反应压力从 0.2 MPa 增加到 1.2 MPa 显着抑制了 CH4 的产生，导致由于竞争性反应而转向环烷烃。这种串联方法作为一种从生物质废弃物生产替代燃料的创新技术显示出巨大的潜力。

更新日期：2023-07-07

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