Recently, Academician of the Chinese Academy of Sciences, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, State Key Laboratory of Catalysis, Li Can, Researcher of Solar Energy Research Department, and Researchers Zong Xu and Dr. Ma Weiguang, etc. Developed electrocatalytic technology to convert carbon dioxide (CO2) and hydrogen sulfide in natural gas (H2S) ) Relevant research on resource-based transformation has made progress. The relevant research results were published in Angew. Chem. Int. Ed.
The main component of natural gas is methane (CH4), which is accompanied by the production of acid gases such as CO2 and H2S. These gases are generally useless and even harmful, making it difficult to extract, transport, process, and use natural gas. What is more serious is that some natural gas fields are directly unable to develop due to the presence of high concentrations of CO2 and H2S. The conversion and utilization of CO2 and H2S gas in natural gas can not only “turn waste into treasureâ€, but also solve the problems of natural gas exploitation and use. It is an ideal strategy with both economic and environmental benefits. For a long time, researchers have focused on the use of Claus technology to catalyze the combustion of H2S to elemental sulfur and water to eliminate H2S, but few methods have been reported for the simultaneous conversion of CO2 and H2S.
In this study, the team proposed and implemented a photo-driven strategy for the collaborative conversion of CO2 and H2S to chemicals. This strategy uses inexpensive non-noble metal as cathode catalyst (graphene-coated zinc oxide) to reduce CO2 and graphene as anode catalyst to oxidize EDTA-Fe2+ (used to oxidize H2S), and uses chemical ring reaction to oxidize H2S to elemental sulfur and Protons, protons, and electrons are used in the electrochemical reduction of CO2 to produce CO. The net result is the coordinated conversion of a stoichiometric chemical reaction (H2S + CO2 → CO + S + H2O). This work achieved a coordinated conversion of CO2 and H2S through electrochemical strategies, providing a green path for both economic and environmental benefits for the purification and resource utilization of harmful gases in natural gas.
To solve the energy and environmental issues, Li Can's team is dedicated to the use of renewable energy resources to convert CO2 and H2S. In the CO2 conversion study, a zinc-zirconium bimetallic solid solution oxide series catalyst (Sci Adv., ACS Catal.) has been recently developed to selectively convert CO2 to methanol and lower olefins, respectively. In the H2S study, a multi-directional conversion of H2S has been achieved using photocatalytic, optoelectronic and photovoltaic-electrocatalytic methods (J. Catal., Angew. Chem. Int. Ed., Energy Environ. Sci., ACS Catal.). . Among them, the quantum efficiency of photocatalytic decomposition of hydrogen from H2S reaches 93%, which is the world record for the quantum efficiency of hydrogen production from nanophotocatalysts under visible light. Based on these foundations, this study will simultaneously convert CO2 and H2S and provide a new technology strategy for large-scale natural gas extraction, transportation and application.
The research work was funded by the National Key R&D Program and the National Natural Science Foundation of China.
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