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5. K+,Ca2+,Fe2+催化β-O-4木质素多聚体模型化合物的快速热解特性研究

K+,Ca2+,Fe2+催化β-O-4木质素多聚体模型化合物的快速热解特性研究

来源 :工程热物理学报 | 被引量 : 0次 | 上传用户：majian198522

【摘 要】

：

为揭示Cα官能团和金属离子对木质素热解过程的影响机制,本研究合成了两种β-O-4型木质素多聚体模型化合物(Cα上分别连接羰基和羟基官能团),开展了在不同温度(500℃、650℃、800℃)和不同金属离子(K+、Ca2+、Fe2+)醋酸盐催化的Py-GC-MS快速热解实验.实验结果表明,Cβ-O键比Cα-Cβ键更容易断裂发生均裂反应产生较多的酚类化合物;添加K+、Ca2+、Fe2+金属离子均能降低热解时所需温度,促进酚类产物的生成,抑制茴香基(醛)类和乙酰苯基类产物的生成.

【作 者】

：

郭以琳 殷黎 冷尔唯 龚勋 陈敬炜 鄂加强 

【机 构】

：

湖南大学机械与运载工程学院,长沙410082;华中科技大学煤燃烧国家重点实验室,武汉430074

【出 处】

：

工程热物理学报

【发表日期】

：

2021年12期

【关键词】

：

热解 木质素模型化合物 K+ Ca2+ Fe2+ 

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论文部分内容阅读

为揭示Cα官能团和金属离子对木质素热解过程的影响机制,本研究合成了两种β-O-4型木质素多聚体模型化合物(Cα上分别连接羰基和羟基官能团),开展了在不同温度(500℃、650℃、800℃)和不同金属离子(K+、Ca2+、Fe2+)醋酸盐催化的Py-GC-MS快速热解实验.实验结果表明,Cβ-O键比Cα-Cβ键更容易断裂发生均裂反应产生较多的酚类化合物;添加K+、Ca2+、Fe2+金属离子均能降低热解时所需温度,促进酚类产物的生成,抑制茴香基(醛)类和乙酰苯基类产物的生成.

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