Abstract

A promising method providing the practical implementation of synthesis of AlPO₄-41 alumophosphate molecular sieve with high phase purity using boehmite, phosphoric acid, and diethylamine as the template has been proposed. It has been shown that the mixing of the precursors at room temperature leads to the formation of a gel consisting of diethylamine phosphate, an amorphous aluminophosphate, and undissolved boehmite. It has been found that the introduction of the stage of gel aging at 90°C leads to the dominant formation of an amorphous aluminophosphate, the subsequent crystallization of which ensures the formation of high phase purity AlPO₄-41 having cubic morphology of crystals with a size of 0.5–1 μm, a BET specific surface area S of 210 m²/g, and a micropore volume of 0.08 cm³/g.

中文翻译：

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二乙胺存在下AlPO 4 -41分子筛的选择性结晶

摘要

已经提出了一种有希望的方法，该方法提供了以勃姆石，磷酸和二乙胺为模板合成具有高相纯度的AlPO ₄ -41磷酸铝分子筛的实用方法。已经表明，前体在室温下的混合导致形成由磷酸二乙胺，无定形铝磷酸盐和未溶解的勃姆石组成的凝胶。已经发现，在90℃下凝胶老化阶段的引入导致无定形铝磷酸盐的主要形成，其随后的结晶确保形成具有立方晶型的晶体的高相纯度的AlPO ₄ -41。尺寸为0.5–1μm，BET比表面积S为210 m ²/ g，微孔体积为0.08 cm ³ / g。