Electrochemical Production of Syngas (CO + H2) Using a Polypyridyl Osmium(II) Complex

سال انتشار: 1398
محل انتشار: بیست و یکمین سمینار شیمی معدنی انجمن شیمی ایران
کد COI اختصاصی: IICC21_152
زبان مقاله: انگلیسی
تعداد مشاهده: 300

نویسندگان

Department of Chemistry, Estahban Higher Education Center, Estahban, Iran

چکیده

The growing concerns about energy crisis due to depletion of fossil fuels and the global warming caused by ever-increasing carbon dioxide (CO2) level have encouraged the search for an economical process to produce useful chemicals from CO2. Electrochemical reduction of CO2 has drawn much attention from both researchers and industries for the past decades [1]. Up to now, a variety of homogeneous and heterogeneous transition metal catalysts have been reported for their ability to electrochemically or photochemically accelerate the reduction of CO2 to CO [2,3]. CO itself can be used as a precursor compound for fuel synthesis processes, where CO and H2 are mixed as synthesis gas (syngas) to form hydrocarbons such as methane or methanol in the well-known Fischer–Tropsch (FT) process [4,5]. Therefore, the sustainable syngas can be resulted in a greener chemical industry and the production of transported liquid fuels through the Fischer–Tropsch technology. The electrochemical conversion of CO2 into syngas can be provided a carbon cycle, which decreases the greenhouse gas emissions and the world s demand for fuels.Here, we report the facile synthesis and fully characterization of a new mononuclear Os(II) complex with phen-dione as a polypyridyl ligand. This Os(II) complex shows an outstanding electrocatalytic activity for CO2 reduction in the presence of the weak acid as a hydrogen source to simultaneously produce H2, and consequently syngas (CO + H2). The compositions of the resulting syngas mixtures are controllable by controlling the reaction conditions. For example, an increase in the acid concentration results in a larger mole ratio of H2:CO. The computational results using DFT are in agreement with the experimental results and confirm the proposed mechanisms.

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