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Title: Synergistic Effect of Mixed Oxide on the Adsorption of Ammonia with Metal–Organic Frameworks

A hydrotalcite-derived MgAl oxide (MMO) was evaluated in combination with the metal–organic frameworks (MOFs) UiO-66 and UiO-66-NH2 for the adsorption of ammonia. Analysis of the materials’ textural properties after ammonia breakthrough adsorption revealed no change in the PXRD patterns or FTIR spectra; however, a slight decrease in surface area was observed, consistent with the hypothesized presence of strongly adsorbed species after adsorption. UiO-66:MMO and UiO-66-NH2:MMO composites maintained ammonia adsorption capacity under dry conditions. An almost 2-fold increase in humid ammonia capacity was observed for the UiO-66:MMO composite, far beyond that expected through a linear combination of the two materials’ capacities. As a result, the synergistic effect observed in humid conditions was further investigated with water adsorption experiments, which suggested the effect is the result of the high water affinity of MMO.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1]
  1. Georgia Inst. of Technology, Atlanta, GA (United States)
Publication Date:
OSTI Identifier:
1254675
Grant/Contract Number:
SC0012577
Type:
Published Article
Journal Name:
Industrial and Engineering Chemistry Research
Additional Journal Information:
Journal Volume: 55; Journal Issue: 22; Journal ID: ISSN 0888-5885
Publisher:
American Chemical Society (ACS)
Research Org:
Georgia Inst. of Technology, Atlanta, GA (United States); Georgia Tech Univ., Atlanta, GA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE