KIDEN AP-QGA-202118 Non Thermal Plasma Metal Organic Owner’s Manual
- June 13, 2024
- KIDEN
Table of Contents
Hiden Analytical Ltd.
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AP-QGA-202118 Non Thermal Plasma Metal Organic
Catalytic decomposition of NO2 over a copper-decorated metal–organic framework by non-thermal plasma
Nitrogen oxide (NOx) causes significant impacts on the environment and human
health, and nitrogen dioxide (NO2) is the most toxic and prevalent form of NOx
in the atmosphere. Its removal and catalytic degradation into non-harmful
species (i.e., N2) are thus important challenges. A great deal of effort has
been devoted to developing catalysts for deNOx processes with a focus on NO
reduction from exhaust gases. The ammonia-assisted selective catalytic
reduction (NH3-SCR) over Cu exchanged zeolites is by far the most effective
method to reduce NOx to N2 and H2O. However, this process has several inherent
limitations, notably the high operating temperature (typically 250-550 o C),
high running cost for reductants, use of corrosive and toxic NH3, and
potential release of NH3 into atmosphere. In contrast, the catalytic
degradation of NO2 for domestic environments is poorly studied. The
development of new efficient catalysts and catalytic processes to enable the
direct decomposition of NO2 at room temperature and without the use of
reducing agents has, therefore, attracted considerable attention.
Porous metal-organic framework (MOF) materials show promise for the highly
selective adsorption and separation of NO2 at room temperature with the high
porosity and tailored-to-design pore functionality. However, the application
of MOF-based catalysts in den Ox processes has been rarely explored, primarily
due to the limited stability of MOFs against highly corrosive NO2 and NH3 at
elevated temperatures. Non-thermal plasma (NTP) activation can promote den Ox
processes at room temperature by generating highly reactive species,
especially vibrationally and electronically excited states of molecules (e.g.,
N2, O2, NO), N and O atoms, radicals, and electrons with a typical electron
temperature of 10 4 o C. NTP activation in MOF-based catalysts has been shown
to enhance performance in catalytic reactions, with the structure and porosity
of the MOF being preserved. There are thus powerful drivers for the
development of efficient den Ox systems that can operate at room temperature
and avoid the use of toxic reductants.
In this study here, a new process combining a robust MOF-based catalyst and NTP-activation has been developed for one-through conversion of NO2 into N2 without use of any external reducing agent at room temperature. The rigid and robust open structure of MFM300(Al) offers an excellent platform to embed uniformly dispersed Cu nanoparticles of diameters of ca. 1 nm using a simple incipient wetness impregnation method. Cu/MFM-300(Al) shows simultaneously high NO2 conversion and high N2 selectivity, as well as an excellent long-term stability under the NTP activation at 25 o C and 1.0 bar. The high catalytic activity of Cu/MFM-300(Al) is attributed to the unique formation of Cu 2+⋯NO nitrosyl adducts, which facilitates the dissociation of NO to improve the yield of N2. Compared with conventional thermal-based catalysis, NTP activation can effectively preserve the structure and porosity of MOF-based catalysts. Coupled with emerging stable MOFs showing ultra-high and selective NO2 adsorption, we are now seeking to design new MOF-based catalysts to drive future development of efficient reductant-free den Ox processes to mitigate air pollutants.
Project summary by:
Martin Schroder
Department of Chemistry
University of Manchester, Manchester M13 9PL, UK
Paper Reference:
“Catalytic decomposition of NO2 over a copper-decorated
metal–organic framework by non-thermal
plasma” (2021) Cell Reports Physical Science 2 (2), 100349
Hiden Product:
QGA Ref: AP-QGA-202118
Product: QGA