Synthesis And Morphology Control Of Inorganic Microporous Compound

Zinc phosphate molecular sieve is an important member of the family of inorganic microporous materials, which has a good application prospect in the catalytic properties and adsorption separation due to its good performance and diversification of the structure. A large number of studies have shown that there is a direct link between properties of the molecular sieves and the size and morphology of the molecular sieve, and can directly affect its application effect at the same time. In recent years, many researchers dedicated to research and develop to how to control the size and the morphology of the inorganic microporous crystal materials. Therefore, researching how to control the size and morphology of the inorganic microporous materials compound become particularly important. The synthesis of inorganic microporous materials under microwave irradiation is known to have many advantages such as fast heating, heating uniformity, narrow particle size distribution of the product.This paper studied the relationship between with the reaction conditions and the morphology of the compound of Zn(H3O)PO4controlling under the condition of traditional oven heating and microwave radiation heating, at the same time, the zinc phosphate molecular sieve with ANA was compounded by microwave assisted heating. Experimental results show that we can control the morphology of crystal which is spherical polyhedron to six prismatic under the polarity of solvent from high to low. NH4Cl have played an important role in promoting the growth of crystal, crystal grain size increases, growth more evenly. By microwave assisted heating method, we can control the size and morphology of the compound of Zn(H3O)PO4by different crystallization temperature, crystallization time and pH changes. Crystals with morphology of six prismatic were synthsised in the crystallization temperature is130℃, crystallization time is3h, under the condition of pH in9～10,600W. Compared with the traditional heat radiation of the hydrothermal synthesis method, microwave synthesis has shown great advantages, promote the crystal growth, reduce the crystallization temperature and reaction time and saved the energy cost. Boron and zinc phosphate molecular sieve with ANA type have been synthesized in the reaction condition which is n ZnCl2:n (NH4)2HPO4:n H3BO3:n EG=1:3:11.2:90,reaction temperature is200℃,reaction time is2h,power is400W, and its grain size is30μm×30μm×30μm. ANA has little effect on the morphology of molecular sieve by external conditions. Boric acid not only have the effect of solvent and reactant in the system; The seed can shorten the reaction time and save energy.