Hydrothermal fluorine-free synthesis method of AlPO4-34

Abstract

The invention mainly relates to a method for synthetizing fluorine-free AlPO4-34 crystals with higher crystallinity and large grain size in proper treatment conditions, wherein hydrofluoric acid is not added, common organic amine morpholine (C4H9NO) is used as template agent, the traditional hydrothermal synthesis method is adopted and a proper raw material ratio is adopted. The method comprises the following steps: mixing aluminium source, phosphorus source, water and organic template agent evenly according to a certain molar ratio in sequence, wherein the molar ratio of Al2O3 to P2O5, R(morpholine) and H2O is 1.0:0.8-1.2:2.0-4.0:40-100; stirring to age, transferring the mixture in a stainless steel reaction kettle, crystallizing at 160-190 DEG C for 3-15 days under the generated pressure; then performing shock cooling, collecting, filtering, washing, and airing naturally to obtain AlPO4-34 molecular sieve raw powder. The method of the invention is green, environmentally friendly and economical, and has simple implementing conditions and wide application prospect.

Description

Fluorine-free Synthesis of AlPO by Hydrothermal Method 4 -34 technical field The invention relates to a method for synthesizing aluminum phosphate molecular sieve AlPO4-34. The traditional synthesis methods of AlPO4-34 are carried out in highly toxic and highly corrosive HF medium, which seriously restricts its practical application and industrialization process. This patent mainly introduces the method of synthesizing AlPO4-34 crystals with high crystallinity and large grains by using the common organic amine morpholine (C4H9NO) as a template and using the traditional hydrothermal synthesis method without adding hydrofluoric acid. . Background technique It has been nearly 30 years since the discovery of aluminum phosphate molecular sieve in 1982. The aluminum phosphate molecular sieves found now have more than 53 structures, and most of these molecular sieves are small-pore, medium-pore, and macro-pore structures, and of course there are some ultra-large microporous co...

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Problems solved by technology

A lot of expensive templates are wasted, the crystallization time is too long, there

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