Abstract
Postsynthesis treatments are frequently used as a means of improving the performance of zeolitic catalysts. This study is concerned with the postsynthesis modification of zeolite H-SSZ-13 by neutron irradiation. An enhanced catalytic activity in the methanol to olefin (MTO) reaction is observed after neutron irradiation of the zeolite H-SSZ-13 catalyst. The magnitude of the neutron irradiation effect depends on the irradiation time and the Si/Al ratio of the parent material, as the highest increase in catalytic activity was observed for the irradiated high silica H-SSZ-13. FT-IR measurements with CO as a probe molecule revealed no significant change in the nature of the acid sites, and the acid strength of the catalytically important Bronsted acid sites was maintained after irradiation. Nitrogen physisorption measurements indicated a decrease in specific surface area and pore volume after neutron irradiation, whereas XRD confirmed that the crystallinity was maintained. The water content was found to be lo...
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