Cellular coal products
According to the present invention there is provided coal-based cellular or porous products, also referred to herein as “carbon foams”, having a density of preferably between about 0.1 g/cm 3 and about 0.8 g/cm 3 and most preferably between about 0.3 and about 0.4 g/cm 3 that are produced by the controlled heating of coal particulate preferably up to ¼ inch in diameter in a “mold” and under a non-oxidizing atmosphere. The coal-based cellular or porous products of the present invention have ash contents typically greater than about 1%. More typically these coal-based cellular or porous products have ash contents greater than about 3%, with ash contents in the range of about 7% to 15% being most typical. The ash residue remaining after essentially complete combustion/oxidation of these coal-based cellular or porous products is predominately composed of oxides of aluminum and silicon. Additionally, the cellular coal-based products of the present invention have relatively low overall B.E.T. surface areas. Such surface areas are typically less than about 5 m 2 /g and are commonly in the range of about 1 m 2 /g to about 2 m 2 /g.
1. A carbon foam having an ash content greater than about 2% by weight, a density ranging from about 0.1 g/cc to about 0.8 g/cc, and a B.E.T. surface area of less than about 5 m 2 /g produce by the direct foaming of high-volatile bituminous coal particulate containing from about 35% to about 45% by weight volatile matter in a non-oxidizing atmosphere.
2. The carbon foam of claim 1 , having an ash content greater than about 2% by weight and less than about 15% by weight.
3. The carbon foam of claim 1 , having an ash content greater than about 10% by weight and less than about 15% by weight.
4. The carbon foam of claim 1 , having an ash content greater than about 3% by weight and less than about 7% by weight.
5. The carbon foam of claim 1 , having an ash content greater than about 10% by weight and less than about 15% by weight.
6. The carbon foam of claim 1 , wherein said B.E.T. surface area is less than about 2 m 2 /g.
7. The carbon foam of claim 1 , wherein said ash comprises oxides of aluminum and silicon.