氧饱和煤焦和二氧化碳气化煤焦的TPD—MS谱分析  

ANALYSIS OF TPD-MS SPECTRA OF CARBON OXIDES ON COAL CHAR SURFACES

作　　者：王继生[1] B McEnaney 

机构地区：[1]煤炭科学研究总院北京煤化学研究所,工程师博士北京100013 [2]英国Bath大学材料科学系

出　　处：《煤炭转化》1992年第4期63-68,共6页Coal Conversion

摘　　要：氧饱和煤焦的TPD-MS谱中的CO_2脱附曲线是宽阔带状,在683K附近有一个脱附峰,CO脱附曲线有一个由963K主峰和1083K的肩峰组成的巨大脱附峰及一个在1473K附近的脱附峰。CO_2气化煤焦的TPD—MS谱只有一条CO脱附曲线,在1253和1473K附近突出两个脱附峰。用CO处理的煤焦样品的TPD-MS谱与CO_2气化煤焦样品的TPD-MS谱相似。由此推测仅有两种分别具有半醌型和环醚型结构的碳表面氧化物参与气化反应,并从结构角度解释了煤焦CO_2气化反应的机理。Three types of TPD-MS spectra from a Baddesley coal charwere measured by heating under vacuum from 523 to 1473 K after: (i) satu-ration with oxygen at 523 K; (ii) gasification with CO_2 at 1123 K for 1h followed by rapid quenching; (iii) saturation with CO at 1123 K foll-owed by rapid quench, separately. The spectrum (i)consists of three CO de-sorption peaks (T-953 K, T_β--1083 K and T_δ--1473 K ) and a broad CO peak.The spectrum (ii) comprises only two CO desorption peaks (T_γ--1223 K andT_δ--1473 K), indicating CO gasification relates only to γ ahd δ states ofsurface carbon oxides.The spectrum (iii) is similar to that (ii), indica-ting CO adsorption and desorption is reversible. By assigning the struc-ture s of the γ state and δ state of surface carbon oxides as semi--quinonegroup and ether group respectively, a mechanism for CO_2 gasification ofcoal char was proposed.

关 键 词：煤气化 TPD-MS法 煤焦 

分 类 号：TQ533.6[化学工程—煤化学工程]