Abstract
The total nitrogen content of a rank series of UK bituminous coals has been shown to reach a maximum at ≈85 wt% carbon, dmmf. Variations in nitrogen functionality with coal rank have been studied by X-ray photoelectron spectroscopy. The element is essentially heterocyclic; 5-membered, pyrrolic nitrogen predominates throughout, but the proportion of the 6-membered, pyridinic form increases with rank. Changes in nitrogen content and functionality with rank are discussed in the context of other reactions occurring during coalification.
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