Open AccessSurface modified coals for enhanced catalyst dispersion and liquefaction. Semiannual progress report, September 1, 1995--February 29, 1996
Author(s) -
G.M.K. Abotsi
Publication year - 1996
Language(s) - English
Resource type - Reports
DOI - 10.2172/432351
Subject(s) - coal , ammonium bromide , catalysis , molybdenum , dispersion (optics) , chemistry , chemical engineering , liquefaction , coal liquefaction , sodium dodecyl sulfate , pulmonary surfactant , inorganic chemistry , dispersant , beneficiation , chromatography , organic chemistry , biochemistry , physics , optics , engineering
The aim of this work is to enhance catalyst loading and dispersion in coal for improved liquefaction by preadsorption of surfactants onto coal. The application of surfactants to coal beneficiation and coal-water slurry preparation is well known. However, the effects of surfactants on catalyst loading and dispersion prior to coal liquefaction have not been investigated. The current work is focused on the influence of the cationic surfactant dodecyl dimethyl ethyl ammonium bromide (DDAB) and sodium dodecyl sulfate (SDS, anionic) on the surface properties of a bituminous coal and its molybdenum uptake from solution. The results show that DDAB created positively charged sites on the coal and increased molybdenum loading compared to the original coal. In contrast, SDS rendered the coal surface negative and reduced molybdenum uptake. The results show that efficient loading of molybdenum catalyst onto coal can be achieved by pretreatment of the coal with dodecyl dimethyl ethyl ammonium bromide