A Family of Nitrogen-Enriched Metal Organic Frameworks with CCS Potential

Abstract

Materials with enhanced carbon capture capacities are required to advance post-combustive amelioration methods; these are necessary to reduce atmospheric carbon dioxide emissions and the associated rate of global temperature increase. Current technologies tend to be very energy intensive processes with high levels of waste produced; this work presents three new metal organic framework materials with embedded Lewis base functionalities, imparted by the nitrogen-rich ligand, demonstrating an affinity for carbon dioxide. Thus, we report the synthesis and characterization of a series of metal organic framework materials using a range of metal centers (Co, Ni, and Zn) with the 1,4-bis(pyridin-4-yl)-1,2,4,5-tetrazine organic linker, in the presence of ammonium hexafluorosilicate. Three distinct crystal structures are reported for Zn-pytz(hydro) 1D chains, and Ni-pytz and Co-pytz isostructural 1D Ladders. Co-pytz shows an uptake of 47.53 mg CO 2 /g of sorbent, which equates to 15 wt % based on available nitrogen sites within the structure, demonstrating potential for carbon capture applications.

Trimetallic Oxide Foam as an Efficient Catalyst for Fixation of CO2 into Oxazolidinone: An Experimental and Theoretical Approach

“…From the observed isotherm, it can be evidently concluded that the adsorption of CO 2 molecules successfully occurred on the PTOF surface (M−O 2− •••CO 2 (M = Cu, Co, Ni)), and the maximum CO 2 uptake was attained to be 1.055 mmol/g. 53,54 These results suggested that the PTOF catalyst possesses Lewis basic sites, which are well accessible and ready for the adsorption of CO 2 during the reaction transformation. Furthermore, to provide further support to the catalyst surface being negatively charged, the ζ-potential of the PTOF also showed a negative surface charge with a value of −5.3 eV.…”

Synthesis, Crystal Structure, and Luminescent Properties of Novel Zinc Metal–Organic Frameworks Based on 1,3-Bis(1,2,4-triazol-1-yl)propane

“…The main area of MOF application–gas sorption and separation arises from their inherent porosity . Two of the most promising fields in this area are methane , and hydrogen − fuel storage and carbon capture and storage , both of these fields are crucial for solving the global problem of climate change . Some MOFs with good gas storage capacity, such as HKUST-1, ZIF-8, or UiO-66 are now produced on industrial scale …”

1,2,4,5-Tetrazine based ligands and complexes

“…99,100 An original type of 1D ladder structure has also been reported by Fletcher et al with the compounds [Ni(4,4'-bptz)1.5(NO3)]•nDCM and [Co2(4,4'-bptz)3(NO3)4]•nDCM. 101 The 1D ladders pack to form a 3D network which shows a reasonable CO2 uptake. From all these results, tetrazine-based MOFs can be considered as suitable materials for gas separation and selective CO2 capture.…”