PVDC焦表面碳氧化物的程序升温脱附的反应动力学  

TEMPERATURE-PROGRAMMED DESORPTION KINETICS OF SURFACE CARBON OXIDES OF PVDC CHAR

作　　者：王继生[1] McE., B 

机构地区：[1]煤炭科学研究总院北京煤化学研究所

出　　处：《煤炭学报》1994年第1期99-107,共9页Journal of China Coal Society

摘　　要：根据ＴＰＤ－ＭＳ谱判定反应级数和计算反应动力学参数的方法，分析氧饱和ＰＶＤＣ焦表面碳氧化物的ＴＰＤ－ＭＳ谱发现：ＣＯ２脱附曲线由活化能Ｅｄ为７１，１５０和１７１ｋＪ／ｍｏｌ的３个二级反应的脱附峰叠加组成；α态ＣＯ脱附是一级反应；β态ＣＯ脱附是Ｅｄ为１８８ｋＪ／ｍｏｌ的二级反应。分析ＣＯ２气化ＰＶＤＣ焦的ＴＰＤ－ＭＳ发现，γ态ＣＯ脱附是Ｅｄ为２３０ｋＪ／ｍｏｌ的二级反应。本文提出的ＰＶＤＣ焦与ＣＯ２反应的机理导出的反应速度方程式与煤焦气化的经典理论一致。A kinetic analysis approach for TPD-MS spectra was proposed. Inthe spectra of PVDC chars saturated with O2, the CO2 desorption curve consists of three components of second-order reactions with Ed of 71, 150 and 171 kJ/mol,respectively; the desorption peaks of α-state and β-state of CO are from a firstorder reaction and a second-order reacton with Ed of 188kJ/mol, respectively.In the spectra of PVDC chars gasified with CO2 and quenched, the desorption peak of γ-state CO is from a second-order reaction with Ed of 230kJ/mol. The hypothetic mechanism proposed for CO2 gasification of coal chars provides a consistent reaction rate equation with classical theory.

关 键 词：煤气化 反应动力学 表面碳氧化物 

分 类 号：TQ541[化学工程—煤化学工程]