US 11,806,693 B2
HPLC carbon with narrow particle size distribution
William R. Betz, State College, PA (US); Michael J. Keeler, Bellefonte, PA (US); Curtis W. Frantz, State College, PA (US); Jay M. Jones, Bellefonte, PA (US); William Maule, Altoona, PA (US); Kenneth G. Espenschied, Spring Mills, PA (US); Cory E. Muraco, State College, PA (US); Clinton Corman, State College, PA (US); and Maochun Ye, Bellefonte, PA (US)
Assigned to Sigma-Aldrich Co. LLC, St. Louis, MO (US)
Filed by Sigma-Aldrich Co. LLC, St. Louis, MO (US)
Filed on Jun. 16, 2021, as Appl. No. 17/349,562.
Claims priority of provisional application 63/039,857, filed on Jun. 16, 2020.
Prior Publication US 2021/0394156 A1, Dec. 23, 2021
Int. Cl. B01J 20/282 (2006.01); B01J 20/20 (2006.01); B01J 20/28 (2006.01); B01J 20/30 (2006.01); C01B 32/205 (2017.01)
CPC B01J 20/282 (2013.01) [B01J 20/20 (2013.01); B01J 20/28004 (2013.01); B01J 20/2808 (2013.01); B01J 20/28021 (2013.01); B01J 20/28052 (2013.01); B01J 20/28071 (2013.01); B01J 20/28073 (2013.01); B01J 20/28083 (2013.01); B01J 20/3057 (2013.01); B01J 20/3071 (2013.01); B01J 20/3078 (2013.01); B01J 20/3085 (2013.01); C01B 32/205 (2017.08); B01J 2220/54 (2013.01); C01P 2004/03 (2013.01); C01P 2004/34 (2013.01); C01P 2004/61 (2013.01); C01P 2006/14 (2013.01); C01P 2006/16 (2013.01)] 20 Claims
 
1. A method for making porous graphitic carbon microspheres comprising the steps of:
providing porous silica microspheres,
dispersing a monovinyl aromatic monomer, a polyvinyl aromatic monomer, and an initiator in a solvent,
contacting the porous silica microspheres with the monomer dispersion for a time sufficient for the monomers to coat the porous silica microspheres,
polymerizing the monomers to form copolymer coated microspheres,
sulfonating the copolymer to form a sulfonated copolymer,
pyrolyzing the sulfonated copolymer to form carbon microspheres,
digesting the carbon microspheres to dissolve the silica leaving porous carbon microspheres,
pyrolyzing the porous carbon microspheres, and
graphitizing the porous carbon microspheres to form porous graphitic carbon microspheres.