Clay-catalyzed in situ pyrolysis of cherry pits for upgraded biofuels and heterogeneous adsorbents as recoverable by-products
Clay-catalyzed in situ pyrolysis of cherry pits for upgraded biofuels and heterogeneous adsorbents as recoverable by-products
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DOI：
10.1007/s13399-022-02921-3
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发表时间：
2022-06
影响因子：
4
通讯作者：
Madeline Karod;Andrew H. Hubble;Alex R Maag;Zoe A. Pollard;Jillian L. Goldfarb
中科院分区：
文献类型：
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作者：
Madeline Karod;Andrew H. Hubble;Alex R Maag;Zoe A. Pollard;Jillian L. Goldfarb
尽管废物转化为能源的前景光明，但通过热化学技术（如热解）生产的生物油具有高粘度和酸性，这使得油不稳定且具有腐蚀性。虽然热解生物原油可以下游升级，但贵金属催化剂的使用限制了生物质转化为生物燃料的经济可行性。为了解决这些经济限制，本研究探索了使用粘土矿物作为廉价催化剂来就地升级生物油。以具有代表性的含碳农工废弃物樱桃核为研究对象，在一系列粘土矿物存在下，在600℃下热解1h。对于某些粘土，催化热解生成的生物油的氧和脂肪酸含量低于非催化热解生成的生物油。与纯樱桃核生物炭相比，非均相粘土-樱桃核生物炭混合物具有更高的表面积和表面化学性质，具有更多的游离羟基和分子间键合羟基。然而，使用亚甲基蓝作为模型有机污染物的吸附研究表明，这些多相炭的吸附能力下降，可能是由于表面官能团的损失。将粘土材料添加到热解流程中会产生更适合下游升级的生物原油，以及能够吸附模型有机化合物的非均质生物炭-粘土混合物（尽管肯定不是优化的）。图形抽象
Despite the promise of waste-to-energy conversions, bio-oils produced via thermochemical techniques such as pyrolysis suffer from high viscosity and acidity, which render the oils unstable and corrosive. While pyrolysis biocrude can be upgraded downstream, the use of precious metal catalysts limits the economic feasibility of biomass to biofuel conversions. To address these economic limitations, the present work explores the use of clay minerals as inexpensive catalysts to upgrade bio-oils in situ. Cherry pits, a representative carbonaceous agro-industrial waste, were pyrolyzed at 600 °C for 1 h in the presence of a series of clay minerals. For some clays, the bio-oils produced from catalyzed pyrolysis exhibited lower oxygen and fatty acid content than bio-oil from non-catalyzed pyrolysis. The heterogeneous clay-cherry pit biochar mixtures had higher surface areas and surface chemistries with increased free and intermolecularly bonded hydroxyl groups relative to those of pure cherry pit biochar. However, adsorption studies using methylene blue as a model organic contaminant showed that these heterogenous chars had a decreased adsorption capacity, likely due to a loss of surface functional groups. The addition of clay materials to the pyrolysis stream yields a biocrude more amendable to downstream upgrading and a heterogeneous biochar-clay mixture capable of (though certainly not optimized for) adsorbing a model organic compound.Graphical abstract