赤泥对玉米秸秆催化热解生物油的影响规律研究

将经过不同温度煅烧的赤泥与玉米秸秆按照一定质量比混合，在500℃下进行催化热解实验，研究赤泥对玉米秸秆生物油组成的影响规律。经TG-DTG和XRD分析发现：600℃煅烧后赤泥（RM600）中含水矿物失水，1 000℃煅烧后赤泥（RM1000）中碳酸盐类化合物分解完全，并且发生了烧结反应。对生物油进行GC/MS分析发现：经过干燥的赤泥（RM）和600℃煅烧的赤泥对羧酸酮基化反应具有明显促进作用，酸类的量降低，酮类的量相应增加，同时对呋喃类的生成也有促进作用。其中，干燥赤泥降酸作用更明显，玉米秸秆与赤泥质量比1：5时，生物油中酸类的量由未添加赤泥时的23.85%降至0.90%。此外，2种赤泥对糖类和醛类都有抑制作用，而1 000℃煅烧的赤泥发生烧结反应，催化作用大幅降低，对生物油组分影响较小。

Effect of Red Mud on Bio-oil from Catalytic Pyrolysis of Corn Straw

Corn stalk was pyrolyzed at 500 ℃ with red mud, which calcined under different temperature, to investigate the effect of red mud addition on the bio-oil composition. TG-DTG and XRD analysis of the calcined red mud indicated that the red mud dehydrated after being calcined under 600 ℃(RM600), and decomposed completely and sintered when it calcined at 1 000 ℃(RM1000). GC/MS analysis of the bio-oil implied that both the red mud dried at 105 ℃(RM) and that calcined at 600 ℃ substantially promoted the ketonization reactions of carboxylic acids. With the addition of RM and RM600, the carboxylic acids content in the bio-oil decreased, correspondingly the ketones content in the bio-oil increased. The acid-reducing effect of RM was wore obvious, as the mass ratio of corn stalk and RM was 1:5, the amount of acids in the bio-oil decreased to 0.90% from 23.85% which was obtained without red mud. In addition, RM and RM600 had a positive effect on the furans formation while suppressed the formation of sugars and aldehydes. However, the red mud calcined under 1 000 ℃ posed a little effects on the bio-oil composition due to the sintering.