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J. Laine, A. Calafat and M. Labady, “Preparation and Characterization of Activated Carbon from Coconet Shell Impregnated with Phosphoric Acid,” Carbon, Vol. 27, No. 2, 1989, pp. 191-195.
http://dx.doi.org/10.1016/0008-6223(89)90123-1

has been cited by the following article:

• TITLE: Ammonia Removal from Rodent Habitat Operations in Space Using Phosphoric Acid Treated Activated Carbon

  AUTHORS: Zhe Lu, Jacob A. Hines, Daniel J. Rozewicz, Michael L. Hines

  KEYWORDS: Activated Carbon; Impregnation; Adsorption; Ammonia; International Space Station

  JOURNAL NAME: American Journal of Analytical Chemistry, Vol.4 No.12, December 27, 2013

  ABSTRACT: To accommodate long duration biology research with rodent habitats on the International Space Station while providing a healthy living and working environment for crewmembers, NASA Ames Research Center developed a new exhaust filter for odor control for the Animal Enclosure Module (AEM), which houses mice and rats. The new exhaust filter uses activated carbon pellets as adsorbents, with phosphoric acid (H3PO4) impregnated on the surface. The deodorization performance of the new exhaust filters for AEM units housed with mice was evaluated. The ammonia breakthrough time of the exhaust filters was also investigated. The results indicated that H3PO4 treated activated carbon exhibited a high ammonia adsorption capacity of more than 90%. Furthermore, the new exhaust filter can effectively control the odor from the AEM units for a 45-day (minimum) flight mission with a given animal biomass.