Coal, containing all the elements that are present in nature and more than 200 minerals, has
a complex chemical structure, making it one of the most complex geological materials …

Geochemical studies of sulfur in coals comprise several major aspects relating to the nature
and origin of sulfur in coals, including the abundance and distribution of sulfur in coal …

Increased demand for liquid transportation fuels coupled with gradual depletion of oil
reserves and volatile petroleum prices have recently renewed interest in coal-to-liquids …

Owing to their unique physical and chemical properties, transition metal compounds,
especially transition metal oxides, nitrides, carbides and sulfides, have been the subject of …

A combination of solid-state 13C NMR, X-ray photoelectron spectroscopy (XPS) and sulfur X-
ray absorption near edge structure (S-XANES) techniques are used to characterize organic …

Arsenic is a toxic metalloid whose mobility and availability are largely controlled by sorption
on sulfide minerals in anoxic environments. Accordingly, we investigated reactions of As (III) …

Coal is physically and chemically a heterogeneous rock which mainly consists of organic
material. It is generally agreed that the organic coal material has been formed from plant …

The sulfur in coal exists in inorganic and organic forms. The inorganic forms are usually
sulfides and sulfates, with pyrite the major inorganic sulfur contaminant in most coals …

X-ray photoelectron spectroscopy (XPS) was used to identify and quantify the
organicallybound nitrogen forms present in fresh Argonne Premium coals. XPS spectra …

Extensive nitrogen K-edge X-ray absorption studies have been performed for the first time
on seven petroleum asphaltenes and nitrogen standard compounds for the purpose of …