Abstract

A way of synthesizing a pelletized high-crystallinity SAPO-11 molecular sieve with a hierarchical pore structure is proposed for the first time. Crystallization is based on preparing pellets composed of 70 wt % of powdered SAPO-11 and 30 wt % of a silicoaluminophosphate binder that is transformed into SAPO-11 during crystallization to form a single system of silicoaluminophosphate crystal aggregates. This crystallization allows the creation of pelletized SAPO-11 characterized by a high degree of crystallinity and phase purity, specific surface area S_BET of 212 m²/g and micro-, meso-, and macropore volumes of 0.08, 0.11, and 0.55 cm³/g, respectively. It is shown that meso- and macropores formed between the SAPO-11 crystal aggregates.

中文翻译：

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具有分级孔隙结构的粒化高结晶度SAPO-11分子筛的结晶

摘要

首次提出了一种具有分级孔结构的粒状高结晶度SAPO-11分子筛的合成方法。结晶是基于制备由70重量％的粉末状SAPO-11和30重量％的硅铝磷酸盐粘合剂组成的粒料，其在结晶过程中转化为SAPO-11以形成单一体系的硅铝磷酸盐晶体聚集体。该结晶允许形成粒化的SAPO-11，其特征在于高度的结晶度和相纯度，比表面积S _BET为212 m ² / g，微孔，中孔和大孔体积为0.08、0.11和0.55 cm ³ / g。结果表明，SAPO-11晶体聚集体之间形成了中孔和大孔。