Mesostructured or Alumina-mesostructured Silica SBA-16 as Potential Support for NO x Reduction and Ethanol Oxidation
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Mesostructured or Alumina-mesostructured Silica SBA-16 as Potential Support for NOx Reduction and Ethanol Oxidation Maya Boutros • Thomas Onfroy • Patrick Da Costa
Received: 6 February 2010 / Accepted: 4 June 2010 / Published online: 22 June 2010 Ó Springer Science+Business Media, LLC 2010
Abstract The synthesis of some mesostructured silica or aluminosilica SBA-16 and Al-SBA-16 with 3D cubic structure is reported in this paper. The structural and porosity properties of these materials were studied by XRD, N2 sorption and TEM imaging; the Al insertion was determined by 27Al-MAS-NMR and acidic properties were characterized by pyridine adsorption followed by FT-IR spectroscopy. These solids were tested in the selective catalytic reduction of NOx by ethanol in the presence of O2. Compared to hexagonal mesoporous silica or aluminosilica (SBA-15 and Al-SBA-15), SBA-16 type materials (SBA16 and Al-SBA-16) could be used as potential catalyst for the oxidation reaction and the SBA-16 solid has higher catalytic properties for the reduction of NOx to N2 at high temperature. Keywords Mesoporous silica or aluminosilica SBA-15 SBA-16 SCR NOx Ethanol Pyridine
M. Boutros Faculte´ des sciences II, Laboratoire de Chimie Physique des Mate´riaux (LCPM), Universite´ Libanaise, Campus Fanar, BP 90656, Jdeideh, Lebanon T. Onfroy UPMC Univ Paris 06, CNRSFRE 3230, Laboratoire de Re´activite´ de Surface, Case 178, 4, Place Jussieu, 75252 Paris Cedex 05, France P. Da Costa (&) Laboratoire Re´activite´ de Surface, UMR CNRS 7197, Universite´ Pierre et Marie Curie, UPMC Paris 6, Universite´ Pierre et Marie Curie, Case178, 4 Place Jussieu, 75252 Paris 05, France e-mail: [email protected]
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1 Introduction The reduction of nitrogen oxides (NOx) in a lean exhaust gases has become one of the most important environmental concerns in present times. Among them, nitrogen oxides (NOx) are not only harmful for human beings but also contribute to environmental pollution by formation of acid rains, increasing the green-house effect, and participating in the formation of photochemical smog [1]. The removal of NOx in the oxygen-rich exhausts demands a novel catalyst for a selective catalytic reduction (SCR) of NOx. The SCR of NOx by ammonia, or in some cases, urea, has become a fairly mature technology for stationary applications [2–4]. This technology is not so easy to implement on automotive field due to difficulties of storing and handling of NH3. Selective Catalytic Reduction by Hydrocarbons (HC-SCR) is a process quite more attractive for NOx abatement [5, 6]. Similarly, SCR of NOx by alcohols (ethanol), seems to be interesting and acceptable for environmental purposes. Up to now, multifarious catalysts such as zeolitic oxide, based on oxide/metals have been found to be effective for NOx reduction in the presence of excess oxygen systems [7]. Mesoporous silicas have been also consider as an ideal solid supports due to their uniform/large pores, tunable pore sizes, high surface areas and a large number of highly dispersed active site
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