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Study of Bronsted acid site in H-MCM-22 zeolite by temperature-programmed desorption of ammonia
Authors: Vaculík Jan | Setnička Michal | Bulánek Roman
Year: 2016
Type of publication: článek v odborném periodiku
Name of source: Journal of Thermal Analysis and Calorimetry
Publisher name: Springer
Place: Heidelberg
Page from-to: 1217-1224
Titles:
Language Name Abstract Keywords
cze Studium Bronstedových kyselých poloh v H-MCM-22 zeolitu pomocí teplotně programované desorpce amoniaku Interakce amoniaku s H-MCM-22 zeolitem byla zkoumána pomocí teplotně programované desorpce s cílem získat informace o termodynamice tohoto procesu. průměrná aktivační energie desorpce amoniaku z Bronstedovy kyselé polohy byla získána z měření pro různé rychlosti ohřevu a průtoku nosného plynu. TPD; amoniak; zeolit; aktivační energie; kyselost
eng Study of Bronsted acid site in H-MCM-22 zeolite by temperature-programmed desorption of ammonia Interaction of ammonia with H-MCM-22 zeolite (Si/Al = 24.5) was investigated by temperature-programmed desorption technique in order to obtain information on thermodynamics of the process. Average activation energy for desorption of ammonia from Bronsted acid sites of H-MCM-22 zeolite was estimated from the data obtained under conditions varying in heating rate and also flow rate of carrier gas. It resulted in value of E-d = 127 kJ mol(-1) for heat rate variation method, whereas flow rate variation led to E-d value of 111 kJ mol(-1). Obtained E-d values are compared with those reported in the literature for other zeolitic materials and discussed in the broader context of zeolite acidity. Comparison of E-d values estimated here for H-MCM-22 zeolite with corresponding data for other protonic zeolites shows that H-MCM-22 displays mediocre/lower activation energy for ammonia compared with other high-silica zeolites. TPD; Ammonia; Zeolite; Activation energy; Acidity