Low pressure methane storage with highly microporous carbons
First Claim
1. An improved process for storing gaseous hydrocarbon fuel in a storage container comprising filling the storage container with activated carbon prior to filling with the gaseous hydrocarbon fuel wherein the improvement comprises activated carbon prepared by a two stage phosphoric acid/potassium hydroxide activation of lignocellulosic material wherein greater than 50% of the total pore volume of the activated carbon is comprised of pores in the range of greater than 8 Å
- up to 20 Å
in width and greater than 95% of the total pore volume of the activated carbon is comprised of pores up to 50 Å
in width, the gaseous hydrocarbon fuel is natural gas which is stored at a pressure of about 500 psi, and the filled storage container delivers at least 150 v/v of natural gas.
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Abstract
A process is disclosed for storing gaseous hydrocarbon fuel in storage containers under relatively low pressure by including in the cylinders highly microporous carbons prepared by further chemical activation of activated carbon comprising activation an active carbon precursor material with an alkali solution, predrying the blend to below about 25% moisture content, heat treating this blend at from about 652° to about 1100° C., and acid washing and drying the microporous activated carbon product, which is characterized by greater than 50% of its total pore volume comprising pores of from above 8 Å to 20 Å in width and greater than 70% of its total pore volume comprising pores of less than 20 Å in width and greater than 95% of its total pore volume comprising pores of less than 50 Å in width.
92 Citations
4 Claims
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1. An improved process for storing gaseous hydrocarbon fuel in a storage container comprising filling the storage container with activated carbon prior to filling with the gaseous hydrocarbon fuel wherein the improvement comprises activated carbon prepared by a two stage phosphoric acid/potassium hydroxide activation of lignocellulosic material wherein greater than 50% of the total pore volume of the activated carbon is comprised of pores in the range of greater than 8 Å
- up to 20 Å
in width and greater than 95% of the total pore volume of the activated carbon is comprised of pores up to 50 Å
in width, the gaseous hydrocarbon fuel is natural gas which is stored at a pressure of about 500 psi, and the filled storage container delivers at least 150 v/v of natural gas. - View Dependent Claims (2, 3, 4)
- up to 20 Å
Specification