High temperature sorbents for oxygen
AssigneeThe United States of America as represented by the Administrator of the National Aeronautics and Space Administration
InventorPramod K. Sharma
Life of this patent
Estimating the term…
Abstract
A sorbent capable of removing trace amounts of oxygen (ppt) from a gas stream at a high temperature above 200.degree. C. comprising a porous alumina silicate support such as zeolite containing from 1 to 10 percent by weight of ion exchanged transition metal such as copper or cobalt ions and 0.05 to 1.0 percent by weight of an activator selected from a platinum group metal such as platinum. The activation temperature, oxygen sorption and reducibility are all improved by the presence of the platinum activator.
Claims9
A regenerable sorbent for the removal of trace amounts of oxygen from a gas comprising;
- a porous alumino-silicate zeolite support in which the atomic ratio of Si to Al is no more than 2.6/1;
- from 1 to 10% by weight of a transition metal ion selected from cobalt or copper exchanged with the support;
- and
- 0.05 to 1.0% by weight of a platinum group metal deposited on the support as an activator.
A method of preparing an oxygen sorbent comprising the steps of:
- exchanging an ion in a porous, alumino-silicate zeolite lattice in which the atomic ratio of Si to Al is no more than 2.6/1 with a transition metal ion selected from copper or cobalt and,
- precipitating an activator selected from a platinum group metal within the pores of the zeolite by incipient impregnation technique.
Dependencies are inferred from the claim text.