Fast pyrolysis of microalgae in a falling solids reactor: Effects of process variables and zeolite catalysts
Fast pyrolysis of microalgae in a falling solids reactor: Effects of process variables and zeolite catalysts
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DOI：
10.1016/j.biombioe.2012.08.023
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发表时间：
2012-11
影响因子：
6
通讯作者：
A. Campanella;M. Harold
中科院分区：
文献类型：
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作者：
A. Campanella;M. Harold
对微藻进行了非催化和催化热解，以产生有机液体燃料前体。在降固反应器中的快速热解的几个过程变量的影响，包括温度，颗粒大小，流量，和气氛（N2，H2O和CO2）的报告。以浮萍为生物量进行了实验，以提供一些比较。根据不同的化合物类型，包括烃类，醇类，含氧化合物，和含氮化合物的物种有机相产物数据进行分类。原位催化热解产生了有机相，其中烃的分数增加，含氧化合物的分数减少，这是脱羧和脱羰等碳去除化学作用的证据。非催化热解得到最高的总液体产率，而催化热解导致所需的烃馏分的产率最高。四种交换的ZSM-5催化剂（H-、Fe-、Cu-和Ni-）的比较表明，质子化沸石在液体产物产率和组成的催化剂中提供了最大的提高：H-ZSM-5将有机相中的烃馏分的产率从21%增加到43%，相对增加100%，并且表现出最少的焦化。生物质重时空速的影响，和H-ZSM 5粉末和整体式催化剂之间的比较也报道。微藻转化为液体燃料的研究结果的影响进行了讨论。
Non-catalytic and catalytic pyrolysis of microalgae were carried out to generate an organic liquid fuel precursor. The impacts of several process variables on the fast pyrolysis in a falling solids reactor are reported, including temperature, particle size, flow rate, and atmosphere (N2, H2O and CO2). Experiments were carried out with duckweed as the biomass to provide some comparison. The speciated organic phase product data were classified according to the different compound types including hydrocarbons, alcohols, oxygenates, and nitrogenates. In-situ catalytic pyrolysis produced an organic phase with an increased fraction of hydrocarbons and decreased fraction of oxygenates, evidence for carbon removal chemistries such as decarboxylation and decarbonylation. The noncatalytic pyrolysis gave the highest total liquid yield while catalytic pyrolysis resulted in the highest yield of the desired hydrocarbon fraction. A comparison of four exchanged ZSM-5 catalysts (H-, Fe-, Cu-, and Ni-) indicates that the protonated zeolite provided the largest enhancement among the catalysts of the liquid product yield and composition: H-ZSM-5 increased the yield of the hydrocarbon fraction in the organic phase from 21% to 43%, a 100% relative increase, and exhibited the least coking. The effects of biomass weight hourly space velocity, and comparisons between H-ZSM5 powder and monolithic catalysts are also reported. The implications of the findings for the conversion of microalgae to liquid fuels are discussed.