Open AccessSorbent carbon development Task 5.2
Author(s) -
R.C. Timpe
Publication year - 1995
Language(s) - English
Resource type - Reports
DOI - 10.2172/227699
Subject(s) - sorbent , thermogravimetric analysis , sorption , char , activated carbon , carbonization , carbon fibers , materials science , adsorption , porosity , inert gas , chemical engineering , coal , bet theory , waste management , mineralogy , chemistry , composite material , organic chemistry , composite number , engineering
The primary objective of this study is to transform low-rank coals (LRCs) into effective sorbent carbons economically for gas- and liquid-phase contaminant removal. The work carried out in this project primarily involved -12 x +30-mesh North Dakota leonardite or lignite, a highly oxygenated LRC. The ash content of the Georesources leonardite, the principal char source, was significantly higher than expected. Reduction of ash content was partially accomplished by grinding the coal and preparing the activated carbon from the -12 x 30-mesh fraction. Preliminary carbon preparation testing was carried out on the small thermogravimetric analyzer (TGA). The sample was carbonized at one temperature (250{degrees}, 350{degrees}, 480{degrees} or 550{degrees}C) under inert gas for selected time, then activated at a higher temperature (700{degree}-1000{degrees}C) under inert or reactive gas for a selected time, then cooled. The resulting carbon was characterized by SO{sub 2} adsorption at ambient temperature or 100{degrees}C. The activated chars prepared on a larger scale was characterized using the following: TGA proximate analysis; SO{sub 2} sorption at ambient temperature; iodine number; BET surface area; and porosity