| OCR Text |
Show compounds. These compounds may be classified under the following categories. a. Volatile inorganic compounds generated by the reduction of sulfides may exist as either pure elements, hydrides, or sulfides of Hg, As and Se. These compounds appear in light distillate fractions and may form suspended droplets (Hg) or particles. b. Volatile organometal1ic compounds of Hg, As and Se are thought to exist either as hydrocarbon-type ligands with direct metal to carbon bonds or as coordination complexes. c. Non-volatile organometal1ic compounds of different elements are shown to exist in coal-derived liquids (Filbey et al., 1981 and Sandstrom et al., 1982). These may be the organometal1ics that are originally present in coal and survive the liquefaction conditions or may have been generated from inorganic matter of coal during liquefaction processes. These metal organic compounds are thought to exist as phenolates, carboxylates, phenoxides or similar coordination complexes. However, it has been shown that porphyrins do not exist in coal-derived liquids, because thay are thought to have decomposed under liquefaction conditions (McGinnis, 1973; and Yen, 1981). In addition, some carbonyls such as Ni(CO)^ may be produced from the reaction of carbon monoxide with metals and metallic compounds formed from corrosion or erosion of high pressure alloys and catalyts. Similar carbonyl compounds of Fe, Co, Mo, and Cr may also be formed. These carbonyls can react with some hydrocarbons to form a large number of 1.5.8 |
