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The oxidative reactivity of coal chars in relation to their structure

机译：煤焦的氧化活性与其结构的关系

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摘要

During the oxidation of porous coal chars the internal surface area can increase as a function of the degree of conversion due to pore growth and the opening up of sealed internal pores or cavities. Consequently, rate expressions for their oxidation are more accurately described in terms of the intrinsic reactivity, where differences in surface area and porosity can be taken into account. The oxidative reactivity of coal chars is complicated by a number of different factors, which are explored in this paper. These include (i) the development of the pore structure during devolatilisation of the coal, (ii) the ash content, its distribution in the carbon matrix and effect on reactivity, (iii) the extent of the H and N functional groups present in the solid matrix, and their interrelation with residual volatile species which are present, (iv) the extent of the graphitic nature of the carbon surface and (v) the active surface area available for reaction.
机译：在多孔煤焦的氧化过程中，由于孔的生长和密封的内部孔或腔的开放，内表面积可以根据转化程度而增加。因此，可以根据固有反应性更准确地描述其氧化速率表达式，其中可以考虑表面积和孔隙率的差异。煤焦的氧化反应性受许多不同因素的影响，本文对此进行了探讨。这些包括（i）煤脱挥发分过程中孔隙结构的发展；（ii）灰分含量，其在碳基质中的分布以及对反应性的影响；（iii）存在于煤中的H和N官能团的程度固体基质及其与存在的残留挥发性物质的相互关系，（iv）碳表面石墨性质的程度，以及（v）可用于反应的活性表面积。

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