Abstract
A facile and effective fluoride post-treated route has been systematically applied for the preparation of hierarchical zeolite catalysts in three different SAPO-34 systems using morpholine, triethylamine and tetraethylammonium hydroxide as template, respectively. Secondary pores in SAPO-34 zeolite crystals are formed by etching with HF-NH4F containing solutions under ultrasonic condition. The samples were characterized by XRD, SEM, N2 adsorption-desorption, XRF, TG, 29Si MAS NMR and NH3-TPD techniques. The set of experimental data demonstrate that the organic templates impact the etching process by fluoride route, most probably the distribution of active sites, thus influence the catalytic properties. It is worth underline that the selectivity to C2H4 and C3H6 over the obtained hierarchical SAPO-34 catalysts in the methanol-to-olefin (MTO) reaction is improved as compared to the parent SAPO-34 catalysts, while an undesired diminished catalyst lifetime is observed for hierarchical SAPO-34 templated by morpholine and tetraethylammonium hydroxide.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.