Acidic property of BEA zeolite synthesized by seed-directed method

Authors :: Feng-Shou Xiao
Haiyan Zhang
Satoshi Suganuma
Chengguang Yang
Naonobu Katada
Source :: Suganuma, S., Zhang, H., Yang, C. et al. Acidic Property of BEA Zeolite Synthesized by Seed-directed Method. Journal of porous materials. 2016, 23(2), 415-421 / This is a post-peer-review, pre-copyedit version of an article published in "Journal of porous
Publication Year :: 2015
Publisher :: Springer Science and Business Media LLC, 2015.
Abstract: The acidic property of a BEA zeolite prepared by a seed-directed synthesis (SDS) method without organic structure directing agent (OSDA) was analyzed by a method of ammonia infrared / mass spectroscopic (IRMS) temperature-programmed desorption (TPD). The number of Brønsted acid sites on the SDS-BEA zeolite was larger than that on a conventional BEA zeolite synthesized from using OSDA. The enthalpy of ammonia desorption, distributed mainly in a range between 115 and 145 kJ mol-1, was in agreement with the acid strength region generated by isomorphous substitution of Si4+ by Al3+ in the BEA framework. These observations confirm that the microstructure around the incorporated Al in the SDS-BEA zeolite was equivalent to that in the conventional one.