NO x control via H 2-selective catalytic reduction (H 2-SCR) technology for stationary and mobile applications
Date
2012ISSN
1874-4648Source
Recent Patents on Materials ScienceVolume
5Issue
2Pages
87-104Google Scholar check
Keyword(s):
Metadata
Show full item recordAbstract
This review paper provides an overview of the use of hydrogen (H 2) gas towards the selective catalytic reduction of nitrogen oxides (NO x) under strongly oxidizing conditions found in many industrial flue gas streams and in the exhaust emissions of diesel-powered vehicles. Patenting activities in the last 15 years are discussed. The advantages in using the H 2-SCR of NO x control technology especially at low-temperatures as to the current NH 3-SCR technology are also discussed. Regarding the stationary NO x control applications, Pd-based catalysts exhibit NO x conversion and N 2-selectivity values in the 80-95% range, depending on the chemical promoter and support composition used have been reported. On the other hand, Pt-based catalysts present lower NO x conversion and N 2-selectivity values (<90%) especially when 10-20 vol% water is present in the flue gas stream. For mobile applications, different formulations of Pd-based catalysts (support and promoter chemical composition) have been reported with NO x conversions higher than 85%. The issue of hydrogen supply has been tackled through the development of on-board hydrogen generation technologies, such as plasma reforming and partial oxidation of diesel fuel. © 2012 Bentham Science Publishers.
Collections
Cite as
Related items
Showing items related by title, author, creator and subject.
-
Article
Low-temperature conversion of phenol into CO, CO 2 and H 2 by steam reforming over La-containing supported Rh catalysts
Constantinou, D. A.; álvarez-Galván, M. C.; Fierro, José Luis García; Efstathiou, Angelos M. (2012)The steam reforming of phenol in the low-temperature range of 350-550°C was studied over 0.5wt% Rh supported on Ce 0.15Zr 0.85O 2, Zr 0.93La 0.07O 2, and Ce 0.13Zr 0.83La 0.04O 2 mixed metal oxides. The reforming specific ...
-
Article
Low-temperature purification of gas streams from phenol by steam reforming over novel supported-Rh catalysts
Constantinou, D. A.; Efstathiou, Angelos M. (2010)The purification of gas streams from phenol at low-temperatures (350-550 °C) was investigated by its reaction with steam over novel catalytic systems, namely 0.5 wt% Rh supported on Ce0.15Zr0.85O2, Ce0.15Zr0.83Mg0.02O2 and ...
-
Article
Catalytic removal of nitrates from waters
Constantinou, C. L.; Costa, Costas N.; Efstathiou, Angelos M. (2010)The selective catalytic reduction of nitrates (NO3 -) in pure water towards N2 formation by the use of gaseous H2 and in the presence of O2 (air) at 1 atm total pressure and 25 °C has been investigated over Pd-Cu supported ...