铁、钙对脯氨酸热解氮演化规律影响机理研究

Study on the Influence Mechanism of Iron and Calcium on the Evolution of Nitrogen-Containing Products From Proline Pyrolysis

为探明铁、钙对脯氨酸热解中含氮物质转化路径的影响,本研究开展了不同温度(300℃、400℃、500℃、600℃)下添加铁、钙(Fe_(2)O_(3)、CaO与Fe_(2)O_(3)+CaO)的脯氨酸快速热解实验,结合原位红外光谱分析,发现脯氨酸前期通过双分子脱水缩合反应生成27.6%的DKP;铁、钙均促进吡嗪、吡咯、吡啶等单环含氮产物生成,且铁将吡咯的生成主要路径转变为脱水后脱羰基;同时添加铁、钙时,铁可延长钙促进嘌呤生成的温度区间延长至500℃,且二者协同使吡啶产量高达21.3%。

In order to investigate the effects of iron and calcium on the conversion pathway of nitrogen-containing substances in proline pyrolysis,this study conducted rapid pyrolysis experiments of proline with the addition of iron and calcium(Fe_(2)O_(3),CaO and Fe_(2)O_(3)+CaO)at different temperatures(300℃,400℃,500℃and 600℃),and combined with in situ infrared spectroscopy analysis.DKP was found to be formed in the first stage of proline pyrolysis by bimolecular dehydration condensation.The yield reaches 27.6%.Iron and calcium both promote the formation of pyrazine,pyrrole,pyridine and other monocyclic nitrogen-containing products,and iron changes the main pathway of pyrrole generation to dehydration followed by decarbonylation.When iron and calcium are added simultaneously,iron can extend the temperature interval of calcium-promoted purine generation to 500℃and synergistically make pyridine yield up to 21.3%.