Surface acid site characterisation is an essential step for the design, development, and quality control of successful zeolite-based catalysts. Temperature programmed methods (TPX) provide fast, precise, and safe screening for catalysts.
In particular, the use of ammonia temperature programmed desorption (TPD) for the evaluation of Brønsted and Lewis acid sites on zeolites and related materials is discussed.
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September 1935: Class A4 locomotive enters service
And your last sentence continues to this day!