Role of Pyridine in Wyodak−Pyridine Adducts
Energy & Fuels2005Vol. 20(1), pp. 239–244
Citations Over TimeTop 25% of 2005 papers
Abstract
When pyridine (PYR) is added to powdered Wyodak subbituminous coal (WYO), the sample is converted to a paste, and the molecular-level adduct which is formed is stable for months. After the excess pyridine has evaporated from the WYO−PYR sample, the stoichiometry of the adduct is ca. two pyridine molecules per bilayer of WYO polycyclic units; this adduct exists even after mild vacuum treatment of the sample. The pyridine molecules in this adduct appear to be located between the bilayer lamellae and to be H-bonded to either H−O or H−N moieties attached to the poly-cyclic aromatic units of WYO. An H-bonded N- - -H−X distance of 2.6 Å has been calculated from a structural model of the WYO−PYR adduct.
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