Abstract

The effect of the temperature and exposure time of the starting aluminophosphate gels on their chemical and phase composition was studied. When the source of aluminum is its hydrated oxide (boehmite), gels with different contents of ammonium phosphate, undissolved boehmite, and amorphous aluminophosphate can be formed. The formation of a gel with dominant amorphous aluminophosphate allows selective crystallization of AlPO₄-11 of high phase purity and ~100% crystallinity. The developed procedure for the preparation of highly dispersed aluminophosphate AlPO₄-11 molecular sieves with these properties allows a transition to crystallization of silicoaluminophosphates SAPO-11—promising domestic catalysts for industrial hydroisomerization of n-paraffins in the production of Arctic diesel fuels and group III oils and isomerization of butenes.

中文翻译：

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具有AEL结构的磷酸铝分子筛的选择性结晶

摘要

研究了起始铝磷酸盐凝胶的温度和暴露时间对其化学和相组成的影响。当铝的来源是其水合氧化物（勃姆石）时，会形成具有不同含量的磷酸铵，未溶解的勃姆石和无定形铝磷酸盐的凝胶。具有主要的无定形铝磷酸盐的凝胶的形成允许高相纯度和〜100％结晶度的AlPO ₄ -11的选择性结晶。用于制备高度分散的磷酸铝的AlPO的发达过程₄ -11分子筛具有这些性质允许硅铝SAPO-11-有为国内催化剂的加氢异构化的工业结晶的过渡Ñ-烷烃用于生产北极柴油和III类油以及丁烯的异构化。