title: Nitrogen-doped carbon nanotubes as a highly active metal-free catalyst for selective oxidation.
abstract: Catalytic reactions are generally carried out on supported metals or oxides, which act as an active phase and require impregnation and thermal treatment steps. During tests, the metal or oxide nanoparticles could be further sintered, which would induces deactivation. Direct incorporation of the active phase into the matrix of a support could be an elegant alternative to prevent catalyst deactivation. Here, we report that nitrogen-doped carbon nanotubes (N-CNTs) can be efficiently employed as a metal-free catalyst for oxidative reactions that allow the selective transformation of the harmful, gaseous H(2)S into solid sulfur. The catalyst exhibits a high stability during the test at high space velocity. The macroscopic shaping of the catalyst on the silicon carbide foam also increases its catalytic activity by improving the contact between the reactants and the catalyst. Such macroscopic shaping allows the avoidance of problems linked with transport and handling of nanoscopic materials and also reduces the pressure drop across the catalyst bed to a large extent.
authors.affiliation: Laboratoire des Matériaux, Surfaces et Procédés pour la Catalyse (LMSPC, UMR 7515 CNRS), Université de Strasbourg, Strasbourg, France.
authors.forename: Kambiz
authors.initials: K
authors.lastname: Chizari
authors.forename: Adrien
authors.initials: A
authors.lastname: Deneuve
authors.forename: Ovidiu
authors.initials: O
authors.lastname: Ersen
authors.forename: Ileana
authors.initials: I
authors.lastname: Florea
authors.forename: Yu
authors.initials: Y
authors.lastname: Liu
authors.forename: David
authors.initials: D
authors.lastname: Edouard
authors.forename: Izabela
authors.initials: I
authors.lastname: Janowska
authors.forename: Dominique
authors.initials: D
authors.lastname: Begin
authors.forename: Cuong
authors.initials: C
authors.lastname: Pham-Huu
mesh_terms: D002384:Catalysis; D006862:Hydrogen Sulfide / Q000737:chemistry; D037742:Nanotubes, Carbon / Q000737:chemistry*; D009584:Nitrogen / Q000737:chemistry*; D010084:Oxidation-Reduction; D013379:Substrate Specificity; D013455:Sulfur / Q000737:chemistry; D013696:Temperature
chemical_list: D037742:Nanotubes, Carbon; D013455:Sulfur; D009584:Nitrogen; D006862:Hydrogen Sulfide