Selective catalytic reduction of no with NH3 over activated carbons. I: Effect of origin and activation procedure on activity

Abstract

General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. Vol. 32, NO. 5, pp. 897-904, 1994 Abstract-The activity for the selective catalytic reduction of NO with NH? (SCR) of a suite of different activated carbons has been studied in the temperature range 373-550 K. The effect of origin (bituminous coal, peat, plum stones, and olive pits), activation agent (steam, CO*), and degree of activation was investigated by activity measurements. In general, the SCR activity, which is relatively high at 373 K, decreases with increasing temperature, and for some carbons increases again above 450 K. Two types of SCR processes are operative. In the lower temperature range, the narrow microporosity affects the rate by increased adsorption of NO, resulting in higher local concentrations. In the higher temperature range, oxygen functional groups determine the SCR activity level. Precursors yielding narrow microporous carbons result in better activities below 450 K. Steam-activated carbons gave higher SCR activity above 450 K than CO?-activated carbons.

The formation of nitrogen-containing functional groups on carbon nanotube surfaces: a quantitative XPS and TPD study

“…As compared to non-doped carbon materials, nitrogen-doped carbon has a higher oxidation resistance. 11,12 Stoehr et al 10 showed that the nitrogen doping by post-treatment in ammonia improved the performance of activated carbon in oxidation reactions. The nitrogen doping also enhanced the basicity of CNTs.…”

Micropore Size Distribution of Activated Carbon Fiber Using the Density Functional Theory and Other Methods

“…Activated carbon has a high surface area and an excellent ability for adsorption of diluted molecules and ions in gas and liquid phases. Therefore, it has been widely used in many industrial and domestic processes such as the removal of contaminants, , gas separation, , gas storage, − and catalytic reactions. − Although activated carbon has a large surface area, the amount adsorbed is mainly dependent on the structure of the pores, particularly micropores. This is because the walls of the pores provide a stronger potential than the external surface area.…”

NH3-activated carbon nanofibers for low-concentration NO removal at room temperature

“…Up to now, considerable efforts have been devoted to removing NO, selective catalytic reduction (SCR) [7] and NO x storage/reduction (NSR) [8] turning NO x into N 2 are the most developed techniques NO x control technology. Nevertheless, SCR and NSR are only effective in removing high-concentration of NO x at higher working temperature (generally above 200°C), which hinder their application in the removal of lowconcentration NO at room temperature.…”