caa a22 4500 463253825 CHVBK 20180405153348.0 cr unu---uuuuu 170326e20070901xx s 000 0 eng 10.1007/s10562-007-9130-9 doi (NATIONALLICENCE)springer-10.1007/s10562-007-9130-9 CO2 addition on the non-oxidative dehydro-aromatization of methane over MoMCM-22 [Elektronische Daten] [Alexandre Rodrigues, José Monteiro] This work aims at studying the effect of CO2 addition in the non-oxidative conversion of methane over a Mo-containing MCM-22 zeolite. Catalyst characterization made use of X-ray fluorescence, textural analysis, X-ray diffraction and diffuse reflectance spectroscopy. Molybdenum was present as highly condensed species with octahedral coordination, such as (Mo7O24)6 and MoO3 species. Catalytic tests were carried out at atmospheric pressure and 700°C, with WHSV of 90gCH4·g Mo −1 h−1. Coke species were studied by thermogravimetric analysis and thermoprogrammed oxidation. Besides the carbidic carbon, two other types of coke were observed: one associated to molybdenum and the other associated to Brönsted acid sites located both on the catalyst surface and inside zeolite pores. The species associated to acid sites, known to be responsible for polyaromatics formation and catalyst deactivation, were reduced in a more significant way by the use of CO2, increasing the catalyst stability. Springer Science+Business Media, LLC, 2007 methane nationallicence carbon dioxide nationallicence MCM-22 nationallicence zeolite nationallicence molybdenum nationallicence Rodrigues Alexandre NUCAT/PEQ/COPPE/UFRJ, Rio de Janeiro, Brasil aut Monteiro José NUCAT/PEQ/COPPE/UFRJ, Rio de Janeiro, Brasil aut Catalysis Letters Springer US; http://www.springer-ny.com 117/3-4(2007-09-01), 166-170 1011-372X 117:3-4<166 2007 117 10562 https://doi.org/10.1007/s10562-007-9130-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10562-007-9130-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Rodrigues Alexandre NUCAT/PEQ/COPPE/UFRJ, Rio de Janeiro, Brasil aut NATIONALLICENCE 700 1- Monteiro José NUCAT/PEQ/COPPE/UFRJ, Rio de Janeiro, Brasil aut NATIONALLICENCE 773 0- Catalysis Letters Springer US; http://www.springer-ny.com 117/3-4(2007-09-01), 166-170 1011-372X 117:3-4<166 2007 117 10562 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer