Role of in situ (in contact with biomass) and ex situ (in contact with pyrolysis vapors) transition metal catalysts on pyrolysis of cherry pits
Role of in situ (in contact with biomass) and ex situ (in contact with pyrolysis vapors) transition metal catalysts on pyrolysis of cherry pits
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DOI：
10.1016/j.fuel.2023.129062
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发表时间：
2023
期刊：
影响因子：
7.4
通讯作者：
Andrew H. Hubble;Bridget A. Childs;M. Pecchi;H. Sudibyo;J. Tester;Jillian L. Goldfarb
中科院分区：
文献类型：
--
作者：
Andrew H. Hubble;Bridget A. Childs;M. Pecchi;H. Sudibyo;J. Tester;Jillian L. Goldfarb
虽然能量密集的液体生物燃料可以通过热化学转化技术从可持续的废物原料中生产出来，但这些生物燃料存在高酸度和低稳定性的问题，主要是由于含氧官能团的存在。通过在生物质热解过程中利用过渡金属催化剂，或在生物质热解过程中利用过渡金属催化剂（直接在下游支撑在氧化铝基体上）作用于热解蒸气，可以通过脱氧提高生物油的质量。四种过渡金属（Cu, Mn, Ni, Zn）要么湿浸渍在樱桃核生物质上，要么浸渍在放置在生物质下游的氧化铝羊毛纤维上，以作用于脱挥发气体。催化剂Cu、Mn和Zn提高了热解生物油收率。使用中性催化剂的Mn、Ni和Zn增加了产生的不可冷凝气体总量，这表明这些下游催化剂将热解分子裂解成更小的有机物和水。这种催化剂会产生大量的含氧气体，如二氧化碳，从而降低生物油的O/C比。然而，这样的反应也增加了所得生物油的含水量。在任意位置使用锰和锌都能提高醇类相对于芳香族碳的浓度，而在原位使用锰则能降低芳香族碳与脂肪族碳的含量之比。
While energy dense liquid biofuels can be produced from sustainable waste feedstocks via thermochemical conversion techniques, these biofuels are plagued by high acidity and low stability, largely due to the presence of oxygenated functional groups. By utilizing transition metal catalysts during pyrolysis eitherin situwithin the biomass, orex situ(directly downstream supported on an alumina substrate) acting on the pyrolysis vapors, the quality of the bio-oil can be improved via deoxygenation. Four transition metals (Cu, Mn, Ni, Zn) were either wet impregnated on cherry pit biomass, or were impregnated on alumina wool fibers placed downstream of the biomass to act on the devolatilized gases. Thein situcatalysts Cu, Mn and Zn increase the pyrolysis bio-oil yield. The Mn, Ni and Zn used asex situcatalysts increase the total non-condensable gas produced, suggesting that these downstream catalysts crack the pyrolyzed molecules into smaller organics and water. Theex situcatalysts result in larger quantities of especially oxygen-containing gases like CO2, which in turn lowered the bio-oil’s O/C ratio. However, such reactions also increase the water content of the resulting bio-oil. Both Mn and Zn used in either location enhance the concentration of alcohols relative to aromatic carbons, and when usedex situ, Mn shows a decrease in the ratio of aromatic to aliphatic carbon content.