Material can be regenerated at least 20 times by heating at 250 C. Sorbent is compatible with environment of high humidity; up to 20% by weight of carbon dioxide can be absorbed. Material is prepared from silver carbonate, potassium hydroxide or carbonate, and sodium silicate

Colombo, G. V.

English

NASA Technical Reports Server

May 1974	 1	 1	 B74-10053 
.	 NASA TECH BRIEF 
Ames Research Center	 - A 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage 
commercial application. Tech Briefs are available on a subscription basis from the National Technical Information 
Service, Springfield, Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology Utilization Office, NASA, Code KT, Washington, D.C. 20546. 
Silver Oxide Sorbent for Carbon Dioxide 
S
A new sorbent which has been developed to re-
move carbon dioxide from the atmosphere of closed-
cycle breathing systems utilizes silver oxide as the 
active ingredient. Unlike the materials in prevalent 
use (lithium hydroxide, soda lime, etc.) which must 
be discarded after exposure because recovery is im-
practical or impossible, the new material can be re-
generated at least 20 times by heating at 250°C. 
Moreover, the sorbent is compatible with an environ-
ment of high humidity; up to 20 percent by weight of 
carbon dioxide (95% theoretical efficiency) can be 
absorbed. 
The material is prepared from silver carbonate (60 
to 90 wt-%), potassium hydroxide or carbonate (30 
to 5 wt-%), and sodium silicate (30 to 5 wt-%). The 
potassium hydroxide is dissolved in a small amount 
of water and mixed with a solution of sodium silicate; 
silver carbonate powder is added to the mixture and 
then water is added to make a thin paste. The paste 
is extruded as pellets, which are partially dried by 
hot air as they travel on a moving belt to a container, 
and then dried overnight in an oven at 82°C. The 
pellets are activated by heating in a muffle furnace at 
250°C for 2 hours, and then cooling in a desiccator.
Notes: 
1. The following documentation may be obtained 
from:
National Technical Information Service 
Springfield, Virginia 22151 
Single copy price $3.00 
(or microfiche $0.95) 
Reference: NASA CR-i 14632 (N73-29054), 
Study of CO2 Sorbents for Extravehicular 
Activity. 
2. No additional documentation is available. Specific 
questions, however, may be directed to: 
Technology Utilization Officer 
Ames Research Center 
Moffett Field, California 94035 
Reference: B74-10053 
Patent status: 
NASA has decided not to apply for a patent. 
Source: Gerald V. Colombo of 
McDonnell Douglas Corp. 
under contract to
Ames Research Center

(ARC-10797) 
Category 04 
This document was prepared under the sponsorship of the National
	 Government assumes any liability resulting from the use of the 
Aeronautics and Space Administration. Neither the United States
	 information contained in this document, or warrants that such use 
Government nor any person acting on behalfof the United States
	 will be free from privately owned rights.
https://ntrs.nasa.gov/search.jsp?R=19740000053 2020-03-17T14:03:43+00:00Z


Silver oxide sorbent for carbon dioxide

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