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| - Acid Site Characterization of Coked USHY Zeolite Using TemperatureProgrammed Desorption with a Component-Nonspecific Detector
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| - In this paper we describe a novel NH3-TPD methodology to study the amount as well as strength of acid sitesof coked catalysts. Conventional temperature programmed desorption (TPD) of ammonia cannot be appliedto coked catalyst as coke precursors removed during the temperature program falsify the ammonia signal.The effects of coke formation from different reactants, time-on-stream, and reaction temperatures on acidsite deactivation were investigated. Besides acid site deactivation, characterization of coke precursors canalso be revealed. The initial deactivation preferentially on strong acid sites is very fast. The concentration offree acid sites is inversely correlated well with the total concentration of coke rather than individual cokegroups. Coke precursors tend to be more stable at higher reaction temperatures.
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