Recently, Academician of Chinese Academy of Sciences, State Key Laboratory of Catalysis of Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Researcher Li Can of the Department of Solar Energy Research, and Researcher Zong Xu, Dr. Ma Weiguang, etc. Developed electrocatalytic technology to convert carbon dioxide in natural gas (CO) 2) and hydrogen sulfide (H 2S) Relevant research on resource-based transformation made progress. The relevant research results were published in "Angew. Chem. Int. Ed.".
The main component of natural gas is methane (CH 4), accompanied by CO 2And H 2S, and other acid gases. These gases are usually useless and harmful, causing difficulties in the extraction, transportation, processing and use of natural gas. More seriously, some natural gas fields are due to high concentrations of CO. 2And H 2The existence of S directly leads to no development. 2And H 2The transformation and utilization of S gas resources can not only 'turn waste into treasure', but also solve the problems of natural gas extraction and use. It is an ideal strategy with both economic and environmental benefits. For a long time, researchers have focused on using Claus technology. Will H 2S Catalytic combustion for elemental sulphur and water to eliminate H 2S, but will CO 2And H 2There are few reports about the method of simultaneous resource transformation.
In the study, the team proposed and implemented a photoelectrically driven CO 2And H 2S. Synergistic conversion to chemical strategies. This strategy uses cheap non-precious metals as the cathode catalyst (graphene coated zinc oxide) to reduce CO 2Graphene as the anode catalyst oxidation media EDTA-Fe 2+ (For Oxidation H 2S), using a chemical ring reaction to H 2S is oxidized to elemental sulfur and protons, and protons and electrons are used for CO 2Electrochemical reduction produces CO. The net result is a synergistic conversion of measured chemical reactions (H 2S + CO 2 → CO + S + H 2O). This work achieved CO through electrochemical strategy 2And H 2S collaborative transformation provides a green path with both economic and environmental benefits for the purification and resource utilization of harmful gases in natural gas.
In order to solve energy and environmental issues, Li Can's team is dedicated to the use of renewable energy resources to convert CO 2And H 2S's research. In CO 2In the conversion study, recently developed a zinc-zirconium bimetallic solid solution oxide catalyst (Sci Adv., ACS Catal.), which selectively 2Conversion to methanol and light olefins, respectively. In H 2In the S study, the photocatalytic, optoelectronic and photovoltaic-electrocatalytic methods (J. Catal., Angew. Chem. Int. Ed., Energy Environ. Sci., ACS Catal.) were used to achieve H. 2Multi-channel directed conversion of S. Among them, photocatalytic decomposition H 2The quantum efficiency of hydrogen production by S reaches 93%, which is the world record for the reported quantum efficiency of hydrogen production from nanophotocatalysts under visible light. Based on these foundations, this study will 2And H 2Simultaneous transformation provides new technology strategies for solving large-scale natural gas extraction, transportation and application.
The research work has been funded by the National Key R&D Program and the National Natural Science Foundation of China.
