Special Issue "Catalytic Decomposition of N2O and NO"
Deadline for manuscript submissions: closed (31 December 2020) | Viewed by 14616
Interests: chemical and reactor engineering; environmental catalysis and photocatalysis; adsorption on solids; kinetics and mechanisms of chemical reaction; abatement of N2O and NOx from waste gases
Nitrogen oxides NOx (NO, NO2) and N2O are significant pollutants and more than 90% of emitted NOx from stationary sources is NO. Various techniques have been developed for NO elimination, such as commercially commonly used selective catalytic reduction of NOx (SCR) and selective noncatalytic reduction of NOx (SNCR). In particular, less efficient SNCR technology will no longer be appropriate due to the tightening of emission limits. Compared to that, SCR NOx technology is very effective, but its disadvantage, like that of SNCR, is the need to add a reducing agent (ammonia, urea), which increases costs, causes undesirable ammonia slip, and requires increased safety precautions. From this perspective, the direct catalytic decomposition of NO without a reducing agent is a challenge. Mixed oxides with alkaline metal promoters appear to be active for this reaction, but there are a number of issues that need to be addressed. These are the stability of catalysts, sufficient activity at industrially suitable temperatures, and suppression of inhibition of the reaction by oxygen and other components present in the waste gases.
Well known greenhouse gas N2O is emitted from some processes together with NOx. Even in this case, a direct catalytic decomposition is the elegant method for reducing its emissions. This technology is now at the stage of its first commercial applications, for example, in nitric acid plants. However, there is still space for increasing its efficiency through the modification of the active site, deposition of the active phase on suitable support, etc.
Another issue is an indoor and outdoor environment, where nitrogen oxides can be decomposed in the presence of suitable semiconductor materials and light with appropriate wavelength and intensity. Research findings focusing on the fundamental exploration of the syntheses, characterizations, and applications of various types of catalysts for N2O or NO catalytic or photocatalytic decomposition, as well as new knowledge about the mechanism and industrial-scale development of catalysts are of prime importance to this Special Issue.
Prof. Dr. Lucie Obalová
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- Direct NO catalytic decomposition
- N2O catalytic decomposition
- Photocatalytic decomposition of nitrogen oxides
- Semiconductor photocatalysts, TiO2
- Mixed oxide catalysts
- Supported catalysts
- Effect of promoters
- Relation between methods of preparation, physicochemical and catalytic properties
- Reaction mechanism and kinetics