Application of Characterization of Acid-Base Sites by Infrared Spectroscopy in the Research of Petroleum Refining and Chemical Catalysts
The process of petroleum refining and chemical industry mainly involves acid catalytic reactions,with a few alkaline catalytic reactions.Therefore,a comprehensive understanding of the acidic and alkaline sites of catalytic materials is of great significance for process optimization and catalyst performance improvement.Infrared spectroscopy is an important means of characterizing the acidity and alkalinity of catalysts.The basic concepts and classifications of solid acid-base systems are briefly described,introduces the basic principles and advantages of infrared spectroscopy for characterizing acid-base sites of the catalyst.The practical experience and reference data of infrared characterization by probe molecules are summarized,the application and supporting role of infrared spectroscopy in characterizing catalyst acidic and alkaline sites in the field of refining and chemical catalysis are and explained through research and development examples.Pyridine and CO are the most commonly used probes for characterizing acidic sites,and are widely applied in catalyst characterization such as catalytic cracking,catalytic pyrolysis,and catalytic hydrogenation.Probes represented by pyrrole and CO2 are still less commonly used in the alkaline characterization of catalysts in the petrochemical industry.With the upgrading of the petrochemical industry and the transformation towards low-carbon and green development,the application of infrared spectroscopy characterization technology is facing new challenges.
infrared spectroscopyacidic sitebasic siteprobe moleculecatalytic materialpetrochemical industry
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