Advanced porous carbonaceous materials and methods to prepare them
The present invention concerns porous carbonaceous particles having pores including micropores and macropores, having a mean diameter, determined by laser diffraction, ranging from 15 to 100 μm and porous carbonaceous monoliths comprising aggregates of said carbonaceous particles.
1. A process for reducing the size of porous carbonaceous particles (II) having pores including micropores and macropores, said particles (II) having a mean diameter, determined by laser diffraction analysis, ranging from 150 μm to 800 μm, said process comprising the steps of:
cryogenically freezing the particles (II),
grinding the frozen particles thereby obtaining particles of reduced size.
2. A process for reducing the size of porous particles (IV) having macropores, said particles (IV) comprising at least one vinylidene chloride polymer having a melting point and a mean diameter, determined by laser diffraction analysis, ranging from 170 μm to 800 μm, said process comprising the steps of:
cryogenically freezing the particles (IV) of the vinylidene chloride polymer,
grinding the frozen particles (IV) thereby obtaining particles of reduced size.
3. A process for manufacturing porous particles having macropores, said particles comprising a vinylidene chloride polymer having a melting point, said process comprising a step of free radical suspension polymerization of at least one monomer comprising vinylidene chloride in the presence of from 0.13 wt. % to 1.50 wt. %, based on the total weight of said monomer, of at least one cellulosic dispersing agent
wherein the manufactured porous particles comprising a vinylidene chloride polymer are porous particles (III) comprising at least one vinylidene chloride polymer having a melting point, said particles having macropores, a mean diameter, determined by laser diffraction analysis, ranging from 20 to 140 μm and a span of at most 2.
4. A process for manufacturing porous carbonaceous particles, said process comprising:
manufacturing porous particles by the process of claim 2 ,
causing the pyrolysis of the vinylidene chloride polymer comprised in the so-manufactured porous particles.
5. The process according to claim 1 , wherein the obtained particles of reduced size are porous carbonaceous particles (I) having pores including micropores and macropores, said porous carbonaceous particles (I) having a mean diameter, determined by laser diffraction, ranging from 15 to 100 μm.
6. The process according to claim 2 , wherein the obtained porous particles are porous particles (III) comprising at least one vinylidene chloride polymer having a melting point, said particles having macropores, a mean diameter, determined by laser diffraction analysis, ranging from 20 to 140 μm and a span of at most 2.
7. The process according to claim 4 , wherein said porous carbonaceous particles are porous carbonaceous particles (I) having pores including micropores and macropores, said porous carbonaceous particles (I) having a mean diameter, determined by laser diffraction, ranging from 15 to 100 μm.