Unveiling unique structural features of the YNU-5 aluminosilicate family

摘要: Abstract YNU-5 (YFI type) is the first zeolite reported with interconnected 12-, and 8-ring pores showing a remarkable catalytic potential towards dimethyl ether (DME)-to-olefin reaction. In this work, structures of as-synthesized, calcined dealuminated zeolites, were investigated by various techniques special emphasis on advanced electron microscopy methods. The frameworks three materials solely determined three-dimension diffraction tomography, space group for them was to be Cmmm, which higher symmetry than previous result. Rietveld refinement performed against synchrotron Powder X-ray data in order obtain precise information framework locate organic species, cations water. Additionally, spherical aberration-corrected scanning transmission employed study local fine structure indicate surface reconstruction associated displacement vacancies through dealumination process. Finally, minor phase, whose solved found MSE type, appeared all materials. Overall, analyses present work provide additional regarding terms determination, terminations identification phase.