Center for Biorefining and Department of Bioproducts and Biosystems Engineering, University of Minnesota, 1390 Eckles Ave., St. Paul, MN 55108, United States.
Bioresour Technol. 2013 Feb;130:777-82. doi: 10.1016/j.biortech.2012.12.115. Epub 2012 Dec 22.
To better understand the pyrolysis of microalgae, the different roles of three major components (carbohydrates, proteins, and lipids) were investigated on a pyroprobe. Cellulose, egg whites, and canola oil were employed as the model compounds of the three components, respectively. Non-catalytic pyrolysis was used to identify and quantify some major products and several reaction pathways were proposed for the pyrolysis of each model compound. Catalytic pyrolysis was then carried out with HZSM-5 for the production of aromatic hydrocarbons at different temperatures and catalyst to feed ratios. The aromatic yields of all feedstocks were significantly improved when the catalyst to biomass ratio increased from 1:1 to 5:1. Egg whites had the lowest aromatic yield among the model compounds under all reaction conditions, which suggests that proteins can hardly be converted to aromatics with HZSM-5. Lipids, although only accounted for 12.33% of Chlorella, contributed about 40% of aromatic production from algal biomass.
为了更好地理解微藻的热解过程，分别选用纤维素、蛋清和菜籽油作为三种主要成分（碳水化合物、蛋白质和脂质）的模型化合物，在热探针上研究了这三种主要成分的不同作用。采用无催化热解对一些主要产物进行了鉴定和定量，并提出了每种模型化合物热解的几种反应途径。然后，在不同温度和催化剂与进料比下，使用 HZSM-5 进行催化热解以生产芳烃。当催化剂与生物质的比例从 1:1 增加到 5:1 时，所有原料的芳烃收率都显著提高。在所有反应条件下，蛋清作为模型化合物的芳烃收率最低，这表明 HZSM-5 很难将蛋白质转化为芳烃。尽管脂质仅占小球藻的 12.33%，但却贡献了藻类生物质芳烃产量的约 40%。
