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Recently, researchers from the Dalian Institute of Chemical Physics, Chinese Academy of Sciences designed and prepared a monolithic carbon nanocomposite catalytic material, which can be used for efficient catalytic conversion of high-content hydrogen sulfide in industrial gas under continuous working conditions
.
This research provides new ideas for the design of highly active desulfurization nanocarbon catalysts under complex reaction environments
It is understood that the material is suitable for the selective oxidation of hydrogen sulfide under complex working conditions such as high oxygen content, high carbon dioxide content, and high water vapor content, and has excellent high value-added sulfur product selectivity and reaction stability
.
The currently used hydrogen sulfide selective oxidation catalyst has problems such as intolerance to water vapor and impurity gas, resulting in poor catalyst activity and stability.
This problem is more prominent in a continuous reaction process
.
Therefore, the design of a catalyst for continuous hydrogen sulfide selective oxidation with high catalytic activity, high sulfur selectivity, and excellent resistance to impurity gases under complex conditions has important application value
Nano-carbon materials have been widely studied in the selective oxidation of hydrogen sulfide due to their unique surface chemistry and excellent catalytic performance.
However, excessively active active centers and strong exothermic characteristics of the reaction can easily lead to excessive oxidation of the product to SOx
.
Based on the previous work, the research team modified the nitrogen-doped monolithic carbon material with phosphate surface.
In addition, the catalyst can still maintain its excellent catalytic activity and stability in a reaction atmosphere containing impurity gas
.
Combining characterization methods, kinetic analysis and theoretical calculations, the researchers found that there is an interaction between the introduced phosphorus group and the pyridine nitrogen site as the active center of the reaction.
