Open AccessExceptional Packing Density of Ammonia in a Dual-Functionalized Metal–Organic Framework
Author(s) -
Christopher Marsh,
Xue Han,
Jiangnan Li,
Zhen-Zhong Lu,
Stephen P. Argent,
Iván da Silva,
Yongqiang Cheng,
Luke L. Daemen,
Anibal J. RamirezCuesta,
Stephen P. Thompson,
Alexander J. Blake,
Sihai Yang,
Martin Schröder
Publication year - 2021
Publication title -
journal of the american chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 7.115
H-Index - 612
eISSN - 1520-5126
pISSN - 0002-7863
DOI - 10.1021/jacs.1c01749
Subject(s) - chemistry , ammonia , synchrotron , neutron diffraction , molecule , metal organic framework , inelastic neutron scattering , adsorption , metal , powder diffraction , inorganic chemistry , crystallography , chemical engineering , nuclear chemistry , neutron scattering , scattering , organic chemistry , crystal structure , optics , physics , engineering
We report the reversible adsorption of ammonia (NH 3 ) up to 9.9 mmol g -1 in a robust Al-based metal-organic framework, MFM-303(Al), which is functionalized with free carboxylic acid and hydroxyl groups. The unique pore environment decorated with these acidic sites results in an exceptional packing density of NH 3 at 293 K (0.801 g cm -3 ) comparable to that of solid NH 3 at 193 K (0.817 g cm -3 ). In situ synchrotron X-ray diffraction and inelastic neutron scattering reveal the critical role of free -COOH and -OH groups in immobilizing NH 3 molecules. Breakthrough experiments confirm the excellent performance of MFM-303(Al) for the capture of NH 3 at low concentrations under both dry and wet conditions.