Editing Zeolite (section)

===Gas separation and storage===
Zeolites have the potential of providing precise and specific separation of gases, including the removal of H<sub>2</sub>O, CO<sub>2</sub>, and SO<sub>2</sub> from low-grade [[natural gas]] streams. Other separations include [[noble gases]], N<sub>2</sub>, O<sub>2</sub>, [[freon]], and [[formaldehyde]].

On-board oxygen generating systems (OBOGS) and [[oxygen concentrator]]s use zeolites in conjunction with [[pressure swing adsorption]] to remove nitrogen from compressed air to supply oxygen for aircrews at high altitudes, as well as home and portable oxygen supplies.<ref>{{Cite web|url=http://www51.honeywell.com/aero/technology/trends3/solutions3/obogs.html?c=13|title=On-Board Oxygen Generating System (OBOGS)|website=Honeywell.com|publisher=Honeywell International Inc.|archive-url=https://web.archive.org/web/20110910220215/http://www51.honeywell.com/aero/technology/trends3/solutions3/obogs.html?c=13|archive-date=10 September 2011|url-status=dead|access-date=9 Feb 2019}}</ref>
[[File:pressure swing adsorption principle.svg|thumb|left|link={{filepath:pressure_swing_adsorption_principle.svg}}|Animation of pressure swing adsorption, (1) and (2) showing alternating adsorption and desorption
{|
!I
|compressed air input
|rowspan="3" width="3em"|
!A
|adsorption
|-
!O
|oxygen output
!D
|desorption
|-
!E
|exhaust
|}]]

Zeolite-based [[oxygen concentrator]] systems are widely used to produce medical-grade oxygen. The zeolite is used as a [[molecular sieve]] to create purified oxygen from air using its ability to trap impurities, in a process involving the adsorption of nitrogen, leaving highly purified oxygen and up to 5% argon.

The German group [[Fraunhofer Society|Fraunhofer e.V.]] announced that they had developed a zeolite substance for use in the [[biogas]] industry for long-term storage of energy at a density four times greater than water.<ref>{{Cite web|url=http://www.fraunhofer.de/en/press/research-news/2012/june/compact-and-flexible-thermal-storage.html|title=Compact and flexible thermal storage|date=1 Jun 2012|website=Fraunhofer Research News|publisher=Fraunhofer-Gesellschaft}}</ref>{{Primary source inline|date=August 2021}}<ref>{{Cite journal |last1=Pirsaheb |first1=Meghdad |last2=Hossaini |first2=Hiwa |last3=Amini |first3=Jila |date=2021 |title=Operational parameters influenced on biogas production in zeolite/anaerobic baffled reactor for compost leachate treatment |journal=Journal of Environmental Health Science & Engineering |volume=19 |issue=2 |pages=1743–1751 |doi=10.1007/s40201-021-00729-3 |pmc=8617091 |pmid=34900303|bibcode=2021JEHSE..19.1743P }}</ref><ref>{{Cite journal |last1=Druzyanova |first1=Varvara |last2=Petrova |first2=Sofya |last3=Khiterkheeva |first3=Nadezhda |last4=Bardamova |first4=Irina |last5=Gergenova |first5=Tatyana |date=2020 |editor-last=Rudoy |editor-first=D. |editor2-last=Ignateva |editor2-first=S. |title=The use of zeolites for biogas purification in agricultural production |journal=E3S Web of Conferences |volume=175 |pages=12012 |doi=10.1051/e3sconf/202017512012|doi-access=free |bibcode=2020E3SWC.17512012D }}</ref> Ultimately, the goal is to store heat both in industrial installations and in small combined heat and power plants such as those used in larger residential buildings.

[[Debbie Meyer Green Bags]], a produce storage and preservation product, uses a form of zeolite as its active ingredient. The bags are lined with zeolite to adsorb [[ethylene]], which is intended to slow the ripening process and extend the shelf life of produce stored in the bags.

Clinoptilolite has also been added to chicken food: the absorption of water and ammonia by the zeolite made the birds' droppings drier and less odoriferous, hence easier to handle.<ref>{{Cite book|title=Innovative Biological Technologies for Lesser Developed Countries|vauthors=Mumpton FA|publisher=US Congress, Office of Technology Assessment|year=1985|veditors=Elfring C|location=Washington, DC|chapter=Ch. VIII. Using Zeolites in Agriculture|lccn=85600550|chapter-url=https://www.princeton.edu/~ota/disk2/1985/8512/851210.PDF |archive-url=https://ghostarchive.org/archive/20221010/https://www.princeton.edu/~ota/disk2/1985/8512/851210.PDF |archive-date=2022-10-10 |url-status=live}}</ref>

Zeolites are also used as a [[molecular sieve]] in [[cryopump|cryosorption]] style [[vacuum pump]]s.<ref>{{cite book|url=https://books.google.com/books?id=4kvzBRUuGDkC&pg=PA17|title=The Art of Cryogenics: Low-Temperature Experimental Techniques|vauthors=Ventura G, Risegari L|publisher=Elsevier|year=2007|isbn=9780080444796|pages=17}}</ref>