煤的吡啶吸附等温线及影响煤吸附行为因素的研究
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摘要: 采用四种标准煤样和模型化合物(WK11离子交换树脂及其Na和Ca类型),在30℃～60℃对比研究煤的吡啶气相吸附等温线和影响其吸附行为的因素。模型化合物结果表明:吡啶能断开WK11中的固有氢键,形成更强的吡啶-羧基官能团氢键,Na或Ca型WK11由于无法与吡啶形成氢键,因此吸附量很小,并几乎无溶胀现象。四种煤样的吡啶吸附结果表明:由于煤化程度和结构的不同,至少有两种类型的吡啶吸附等温线。同时,煤的吡啶吸附总量并不仅取决于在吸附过程中形成的氢键数量,而且也受其它特殊作用力的影响,这种影响对于高阶煤尤其显著。Abstract: The vapor pyridine adsorption isotherms of coal were investigated using several coals and a model compound(WK11 ion exchange resin and its Na and Ca types) at the temperature of 30℃～60℃. The results indicated that pyridine could disrupt weak hydrogen bonds of original WK11 to form strong pyridine-COOH hydrogen bond, and swell WK11 structure. However, there were a very small amount of adsorption and a very low swelling ratio for Na and Ca type WK11s because of no hydrogen bond formation. There were two different kinds of pyridine adsorption behaviors at low pressure for four coals because of the difference of coal structure. The total pyridine adsorption amount of coals was not only dependent on the hydrogen bonds formed during adsorption process, but also influenced by other kind of specific interaction especially for high rank coals.
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Key words:
- coal /
- pyridine /
- isotherm /
- hydrogen bond
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