Porositization process of carbon or carbonaceous materials

Patent metadata

Field	Value
Publication number	US-9533281-B2
Application number	US-201414211357-A
Country	US
Kind code	B2
Filing date	Mar 14, 2014
Priority date	Mar 14, 2013
Publication date	Jan 3, 2017
Grant date	Jan 3, 2017

Abstract

Porositized/activated carbon processed from carbon or carbonaceous raw materials. The porositization process comprises: (1) loading porositizing agents; (2) thermal treatment; and (3) porous generation. In another embodiment, the porositization process comprises: (1) loading porositizing agents; and (2) thermal treatment wherein the carbon or carbonaceous materials undergo carbonization and self-activation during the thermal treatment. Activated carbon products that exhibit magnetic functionality.

First claim

What is claimed is:

1. A method of making porositized/activated carbon comprising the steps of:
loading a porositizing agent, or a mixture of porositizing agents, to carbon materials selected from the group consisting of charcoal, coal, peat, lignite and petroleum coke, or a carbonaceous material, to generate a carbon material/metallic compound aqueous dispersion, or a carbonaceous material/metallic compound aqueous dispersion, wherein the porositizing agent or mixture of porositizing agents comprises metallic compounds formed from the aqueous dispersion, wherein the metallic compounds include metals selected from the group consisting of Fe, Cu, Zn, Ag, Cr, Co, Pt, Pd, Rh, Re, Mn, Sn, V, Pb, Ge, As, Se, Mg, Ca, Ba, Mo, Ru, Os, Ir, Y, and combinations thereof, and wherein the metallic compounds are formed in situ in the aqueous dispersion by adding a base solution to the aqueous dispersion and mixing the resulting mixture;
subjecting the carbon material/metallic compound aqueous dispersion, or the carbonaceous material/metallic compound aqueous dispersion, to a thermal treatment at a desired temperature above about 300° C. to give a thermally-treated carbon material/metallic compound mixture, or a thermally-treated carbonaceous material/metallic compound mixture; and
subjecting the thermally-treated carbon material/metallic compound mixture, or the thermally-treated carbonaceous material/metallic compound mixture, to an acid to yield porositized/activated carbon.

2. The method of claim 1 , wherein the metallic compounds are selected from Fe 2 O 3 , FeO, Fe 3 O 4 , Fe(NO 3 ) 3 , Fe 2 (SO 4 ) 3 , Fe(NO 3 ) 2 , FeSO 4 , FeSO 3 , FeHSO 4 , (NH 4 ) 2 Fe(SO 4 ) 2 , Fe(HCO 3 ) 2 , Fe(OH) 3 , Fe(OH) 2 , CuO, ZnO, AgO, K 2 Cr 2 O 7 , Fe 2 (C 2 O 4 ) 3 , K 3 [Fe(C 2 O 4 ) 3 ], FeCO 3 , Co(OAc) 2 , Cr(NO 3 ) 3 , CuSO 4 , and combinations thereof.

3. The method of claim 1 , wherein the step of subjecting the carbon material/metallic compound aqueous dispersion or the carbonaceous material/metallic compound aqueous dispersion to a thermal treatment further comprises the steps of:
placing the carbon material/metallic compound aqueous dispersion or the carbonaceous material/metallic compound aqueous dispersion in a vacuum furnace chamber, wherein the carbon material/metallic compound aqueous dispersion or the carbonaceous material/metallic compound aqueous dispersion comprises the metallic compounds precipitate previously formed in situ in the aqueous dispersion by adding the base solution, and wherein a vacuum force is applied for a period of time and an inert gas is introduced into the vacuum furnace chamber;
heating the vacuum furnace chamber at a certain heating rate, while maintaining the flow of inert gas, until the desired temperature above about 300° C. is reached;
maintaining the vacuum furnace chamber at the desired temperature for a period of time between about 10 minutes and 6 hours;
cooling the vacuum furnace chamber to room temperature; and
removing from the vacuum furnace chamber a thermally-treated carbon material/metallic compound mixture or a thermally-treated carbonaceous material/metallic compound mixture.

4. The method of claim 1 , wherein the step of subjecting the thermally-treated carbon material/metallic compound mixture or the thermally-treated carbonaceous material/metallic compound mixture to an acid further comprises the steps of:
placing the thermally-treated carbon material/metallic compound mixture or the thermally-treated carbonaceous material/metallic compound mixture in an acid, wherein the acid comprises HCl, H 2 SO 4 , HNO 3 , HI, HBr, HF, HClO 4 , HCOOH, CH 3 COOH, C 6 H 5 SO 3 H, C 6 H 5 COOH, or a combination thereof;
mixing the resulting solution for a period of time; and
filtering and drying the resulting solution to yield porositized/activated carbon.

5. A method of making porositized/activated carbon comprising the steps of:
loading a porositizing agent, or a mixture of porositizing agents, to carbon materials selected from the group consisting of charcoal, coal, peat, lignite and petroleum coke, or a carbonaceous material, to generate a carbon material/metallic compound aqueous dispersion, or a carbonaceous material/metallic compound aqueous dispersion, wherein the porositizing agent or mixture of porositizing agents comprises metallic compounds formed from the aqueous dispersion, wherein the metallic compounds include metals selected from the group consisting of Fe, Cu, Zn, Ag, Cr, Co, Pt, Pd, Rh, Re, Mn, Sn, V, Pb, Ge, As, Se, Mg, Ca, Ba, Mo, Ru, Os, Ir, Y, and combinations thereof, and wherein the metallic compounds are formed in situ in the aqueous dispersion by adding a base solution to the aqueous dispersion and mixing the resulting mixture; and
subjecting the carbon material/metallic compound aqueous dispersion, or the carbonaceous material/metallic compound aqueous dispersion, to a thermal treatment at a desired temperature above about 300° C. in a vacuum furnace chamber under controlled vacuum and inert gas flow conditions to yield porositized/self-activated carbon.

6. The method of claim 5 , wherein the metallic compounds are selected from Fe 2 O 3 , FeO, Fe 3 O 4 , Fe(NO 3 ) 3 , Fe 2 (SO 4 ) 3 , Fe(NO 3 ) 2 , FeSO 4 , FeSO 3 , FeHSO 4 , (NH 4 ) 2 Fe(SO 4 ) 2 , Fe(HCO 3 ) 2 , Fe(OH) 3 , Fe(OH) 2 , CuO, ZnO, AgO, K 2 Cr 2 O 7 , Fe 2 (C 2 O 4 ) 3 , K 3 [Fe(C 2 O 4 ) 3 ], FeCO 3 , Co(OAc) 2 , Cr(NO 3 ) 3 , CuSO 4 , and combinations thereof.

7. The method of claim 5 , wherein the step of subjecting the carbon material/metallic compound aqueous dispersion or the carbonaceous material/metallic compound aqueous dispersion to a thermal treatment further comprises the steps of:
placing the carbon material/metallic compound aqueous dispersion or the carbonaceous material/metallic compound aqueous dispersion in a vacuum furnace chamber, wherein the carbon material/metallic compound aqueous dispersion or the carbonaceous material/metallic compound aqueous dispersion comprises the metallic compounds previously formed in situ in the aqueous dispersion by adding the base solution, wherein a vacuum force is applied for a period of time and an inert gas flow is introduced into the vacuum furnace chamber;
terminating the vacuum force and inert gas flow into the vacuum furnace chamber;
heating the vacuum furnace chamber at a certain heating rate until a desired temperature from about 300° C. to about 1,500° C. is reached;
maintaining the vacuum furnace chamber at the desired temperature for a period of time between about 10 minutes and about 6 hours;
cooling the vacuum furnace chamber to room temperature; and
removing from the vacuum furnace chamber a porositized/self-activated carbon.

Assignees

• Univ North Texas

Inventors

• Shi Sheldon Q
• Xia Changlei

Classifications

• C02F1/283

  using coal, charred products, or inorganic mixtures containing them · CPC title

• B01J20/3064 Primary

  Addition of pore forming agents, e.g. pore inducing or porogenic agents · CPC title

• B01J20/0203

  comprising compounds of metals not provided for in B01J20/04 (oxides or hydroxides thereof B01J20/06) · CPC title

• B01J20/28009

  Magnetic properties · CPC title

• B01J20/20

  comprising free carbon; comprising carbon obtained by carbonising processes · CPC title