Metal–organic frameworks for NH₃ adsorption by different NH₃ operating pressures

Abstract

NH3 has been used in wide applications, such as fertilizers, hydrogen sources, and working fluids, where proper NH3 adsorbents are required to minimize human health risks in daily NH3 exposure as well as to achieve energy efficiency in energy conversion systems. As NH3 operating pressure differs from each usage, the structure and properties of the NH3 adsorbent need to be optimized in each NH3 operating pressure. Metal–organic frameworks (MOFs) have emerged as promising NH3 adsorbents, which would be customizable for different NH3 pressures due to great structural tunability. We introduce up‐to‐date reports with MOFs as NH3 adsorbents and classify them by the NH3 pressure, from high in adsorption heat pumps to extremely low in daily life sensing. MOFs with high NH3 adsorption capacity and durability are suggested in different NH3 pressure ranges, and their structural factors are discussed to help design high‐performance MOFs for NH3 adsorption in different NH3 pressures.

TEMPO-immobilized metal–organic frameworks for efficient oxidative coupling of 2-aminophenols and aldehydes to benzoxazoles

“…15,[22][23][24][25][26] Metalorganic frameworks (MOFs) are three-dimensional organicinorganic hybrid heterogeneous materials that have been extensively used in various applications, including gas storage, molecular separation, and molecular shuttling, because of their permanent porosity. [27][28][29][30][31] MOFs exhibit structural diversity, not only in terms of their inorganic nodes but also their organic ligands, which can be functionalized with various useful organic molecules. Consequently, over the past decade, various research groups have explored the immobilization of TEMPO-derived nitroxyl radical species onto MOFs.…”

Covalent connections between metal–organic frameworks and polymers including covalent organic frameworks

“…Indeed, the structural variability and functionality of MOFs offer vast potential in diverse domains, ranging from molecular storage [8][9][10] and separation 11,12 to catalysis, [13][14][15] drug delivery, [16][17][18] sensing, [19][20][21] and more. [22][23][24][25][26][27] However, despite their multitude of applications, these materials face inherent challenges that render them impractical for many uses. Poor processability, as well as hydrolytic, chemical, thermal, and mechanical instabilities, have frequently hindered the success of MOF-based technologies.…”

Methylbenzyl Naphthalene: Liquid Organic Hydrogen Carrier for Facile Hydrogen Storage and Release

“…Hydrogen storage through chemical bonding is an attractive strategy that is advantageous over physical storage methods in terms of technical and safety characteristics. In this regard, various metal–hydrogen complexes (such as LiBH 4 and NaAlH 4 ), metal hydrides (such as NaH and MgH 2 ), and chemical compounds (such as NH 3 , CH 3 OH, and HCOOH) are widely employed in chemical hydrogen storage systems. − In particular, a liquid organic hydrogen carrier (LOHC) concept comprising liquid-state organic molecules has attracted considerable research attention owing to the high gravimetric hydrogen storage capacities of 5–8 wt %, reversibility of hydrogen charging and discharging, safe storage without energy losses, and transportation over long-distances using existing energy transport logistics. In addition, the LOHC materials have a great potential to meet the system-based vehicle applications goals set by the U.S. Department of Energy (5.5 wt %, 40 g L –1 hydrogen storage capacity) and European Union (5 wt %, 23 g L –1 hydrogen storage capacity). − …”