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Structure and Stability of Mg–HZSM-5/Al 2 O 3 Catalysts for Synthesizing Olefins from DME: Effect of Thermal and Hydrothermal Treatments
Catalysis in Industry Pub Date : 2019-09-16 , DOI: 10.1134/s2070050419030024
M. I. Afokin , I. A. Davydov , E. G. Peresypkina , M. V. Magomedova

Abstract

Changes in the structural, textural, and acidic properties of Mg–HZSM-5/Al2O3 catalyst subjected to pretreatment (thermal and hydrothermal) of varying temperatures and durations are studied. The catalysts are characterized by XRF, XRD, 27Al solid-state NMR spectroscopy, nitrogen adsorption, DRIFT spectroscopy, and ammonia TPD. The catalytic activity of the samples in converting dimethyl ether (DME) to lower olefins is studied. It is shown that the initial catalytic activity of an Mg-containing zeolite catalyst is determined by the total acidity of the surface and does not depend on the initial acid site strength distribution, while the stability of the catalyst depends on its morphological properties.


中文翻译:

用于从二甲醚合成烯烃的Mg–HZSM-5 / Al 2 O 3催化剂的结构和稳定性:热处理和水热处理的影响

摘要

研究了经过不同温度和持续时间的预处理(热和水热)的Mg–HZSM-5 / Al 2 O 3催化剂的结构,结构和酸性性质的变化。催化剂的特征在于XRF,XRD,27 Al固态NMR光谱,氮吸附,DRIFT光谱和氨TPD。研究了样品在二甲醚(DME)转化为低级烯烃中的催化活性。已经表明,含镁的沸石催化剂的初始催化活性由表面的总酸度决定,并且不取决于初始酸位强度分布,而催化剂的稳定性取决于其形态性质。
更新日期:2019-09-16
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