A TDS STUDY ON THE REACTION INTERMEDIATES IN THE CATALYZED GASIFICATION OF ACTIVATED-CHARCOAL

被引：2

作者：

CHOI, KH ^{[1
]}

LEE, WY ^{[1
]}

RHEE, HK ^{[1
]}

MOON, SH ^{[1
]}

LEE, HI ^{[1
]}

机构：

[1] SEOUL NATL UNIV,DEPT CHEM ENG,SEOUL 151742,SOUTH KOREA

来源：

KOREAN JOURNAL OF CHEMICAL ENGINEERING | 1993年 / 10卷 / 02期

关键词：

D O I：

10.1007/BF02697398

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Catalytic coal gasification was studied by using thermal desorption spectroscopy (TDS) under high vacuum conditions. Activated charcoal was used as a model compound of coal, and Na2CO3 and K2CO3 as catalysts. Catalysts enhanced oxygen adsorption and decomposed at temperatures below their own decomposing temperatures. After pretreatment of the catalyst at high temperature the CO2 desorption pattern represented characteristics of reaction intermediates. There were two peaks, alpha-peak and beta-peak, in CO2 TDS curves. From the experimental results, alpha-peak was interpreted to the result from intercalated metal-carbon (M-C) complex, and beta-peak from metal-oxygen (M-O-C) complex. A higher pretreatment temperature led to decrease both the number of M-O-C complex and its thermal stability. The increase of catalyst loading in Na2CO3-containing sample resulted in relative increase of the number of M-O-C complex than that of intercalated M-C complex, and also increase of thermal stabilities of both reaction intermediates. Major difference between K2CO3 and Na2CO3 appeared in alpha-peak, intercalated M-C complex. That is, the contribution of intercalated metal-carbon complex to total reaction intermediates was larger in K2CO3 than Na2CO3. This could be attributed mainly to the better intercalating ability of potassium due to its lower ionization potential.

引用

页码：78 / 84

页数：7

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