Abstract
ABSTRACT Different basic materials, such as K-L zeolite, K-Al2O3, K-Mg/Al mixed oxide and MgO, were used as supports of Pt-catalysts for the dry reforming of methane (DR) reaction. The effects of the distribution of basic strength in the support on the metal-support properties and catalyst performance were evaluated. The density of strong and the total basic sites decreased as follows: MgO>K(Mg-Al) >K-Al2O3>K-L. The total basic sites decrease from 214 to 23 µmol CO2. g-1, for MgO and KL, respectively. Pt catalysts supported on materials with high density of strong basic sites such as MgO were the most adequate for the DR reaction. An increase in the dehydrogenation velocity of 12.1 to 25.2 mol h-1 g-1 was observed between Pt/KL and Pt/MgO, which indicates a higher metallic dispersion of the latter catalyst. With respect to the DR reaction, both catalysts have a similar CO2 conversion, but the CH4 conversion and the H2/CO ratio increase from 71.1 to 83.0 % and 0.5 to 0.73, respectively. The best catalytic behaviour of Pt/MgO would be related with the good interaction between the metal and the basic support. The methane conversion and the H2/CO ratios obtained by DR reaction correlate quite well with the basicity of the different catalysts.
Highlights
The transformation of methane into syngas, a more valuable product, has attracted noticeable interest since high conversions and selectivities can be obtained
The syngas produced by this reforming reaction is used as feedstock for various chemical processes, such as fuel cells fed with H2, methanol synthesis and Fischer-Tropsch synthesis (Seo and Young, 2009; de Miguel and Vilella 2012)
At the reduction temperature (823 K) previous to the dry reforming reaction and in the presence of H2, Pt is reduced to the metallic state
Summary
The transformation of methane into syngas, a more valuable product, has attracted noticeable interest since high conversions and selectivities can be obtained. The DR of methane has the advantage of providing a H2/CO ratio equal to 1, more appropriate for carbonylation and hydroformylation reactions, and lower operating costs compared to the processes of SR and oxidative reforming (OR), and brings a contribution to environmental preservation, because it consumes carbon dioxide, which is one of the greenhouse gases (van Keulen and Hegarty, 1997; de Miguel and Vilella, 2012). This process is presented as a promising alternative to obtain both synthesis gas as well as hydrogen.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
