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Surface science and mechanism investigation of pyrochlore catalysts in the dry reforming of methane

Grant number: 19/01265-4
Support type:Scholarships abroad - Research Internship - Doctorate
Effective date (Start): April 01, 2019
Effective date (End): January 31, 2020
Field of knowledge:Engineering - Chemical Engineering - Chemical Process Industries
Principal researcher:Jose Mansur Assaf
Grantee:Adriana Paula Ramon
Supervisor abroad: Jeroen A. Van Bokhoven
Home Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil
Research place: Paul Scherrer Institute (PSI), Switzerland  
Associated to the scholarship:16/16329-0 - Dry reforming of methane over La2Ce2-xNi0,5xO7-´ pyrochlore oxides for syngas production, BP.DR


Currently, due the growing environmental concern over greenhouse gases, the dry reforming of methane (DRM) has attracted increasing attention in syngas production (CO + H2), in view of the effective utilization of CH4 and CO2. Furthermore, the DRM is a promising process to generate syngas with molar ratio H2:CO near to 1:1, which can be used in a number of processes like Fischer-Tropsch or the production of oxoalcohols and acetic acid. The main problems in DRM are the large formation of carbon depositions over the catalyst and the metal sintering. In the attempt to overcome these problems, different supports consisting of stable mixed oxides presenting structures like pyrochlore and perovskite types have been developed. In this work, pyrochlore catalysts (La2Ce2-xNixO7-») were synthesized by co-precipitation, sol-gel, modified Pechini and hydrothermal methods and will be characterized under operando and in situ facilities at Paul Scherrer Institute. The purpose of this research is to improve the understanding of surface interactions on reactant-active sites in the DRM. Ambient pressure techniques, such as X-ray photoemission spectroscopies and Infrared Spectroscopy should be utilized to determine the adsorption strength and configurations of CO2 and key intermediates. Thus, it is expected to identify the different physico-chemical properties generated by the different synthesis methods and relate them to the catalytic performance. (AU)

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