TPR法研究煤焦—CO_2气化反应──（Ⅰ）碳化条件和掺加金属催化剂对气化反应性的影响  

A Temperature-Programmed Reaction Study on Char-CO_2 Gasification ──(I) Effect of Carbonization Conditions and Metallic Catalysts on Gasification Reactivity

作　　者：徐秀峰[1] 崔洪[1] 朱珍平[1] 顾永达[1] 陈诵英[1] 

机构地区：[1]中国科学院山西煤炭化学研究所煤转化国家重点实验室

出　　处：《煤化工》1996年第3期37-41,30,共6页Coal Chemical Industry

基　　金：国家自然科学基金

摘　　要：改变碳化条件和掺加金属催化剂，制备了十几个煤焦样品。用ＸＲＤ测定了未载金属煤焦的碳微晶尺寸。用ＴＰＲ法测定了上述煤焦的ＣＯ_２气化反应性，用Ｆｒｅｅｍａｎ－Ｃａｒｒｏｌｌ方法计算得到了反应活化能Ｅ和指前因子Ａ。结果表明：碳化条件越剧烈，煤焦的气化活性越低。掺加不同量的钙催化剂，煤焦的气化活性得到不同程度的提高，同时ＤＴＧ曲线有明显的变化。这些现象可从碳化条件对煤焦气化活性的影响，以及钙对煤焦ＣＯ_２气化的催化作用等方面来解释。The purpose of this study was to clarify the influence of carbonization conditions and calcium catalysts on gasification reactivity of coal chars. Ca loading was performed by impregnation method with an acetate solution. The gasification reactivity was investigated by performing temperature-programmed reactions (TPR) with coal chars prepared at various carbonization conditions and Ca-containing char samples,under 0.1MPa CO_2 stream.The results showed that more severe carbonization conditions led to lower gasification reactivity of chars. Reactivity of Ca-containing chars increased with Ca content up to a loading saturation level (LSL) of about 5wt%. X-ray diffraction(XRD)has been used to determine carbon microcrystallite size of coal chars. The different catalytic behaviour of calcium catalyst below and above the LSL may be due to catalyst dispersion conditioned by carboxyl groups. Only the exchanged calcium has a catalytic activity,whereas the excess calcium which has low dispersion does not have additional catalytic activrty.

关 键 词：碳化 金属催化剂 程序升温反应 气化 煤气化 

分 类 号：TQ541[化学工程—煤化学工程]