The Morphological Control Of Several Aluminophosphate Zeolites By Solvent-free Synthesis

Petroleum chemical engineering and fine chemical engineering are considered to be two important chemical production industries towards people’s life. Zeolite, served as one of the most important solid catalysts in mentioned industries, is always playing considerate role. As the problem in energy and environment becomes increasingly severe, much more attention paid to environment and higher demand for energy development motivates people to keep focusing on new catalytic materials with high catalytic activity and long life. The morphology of zeolite does have huge effect on performance and lifetime of catalysts. By morphological controls, improvements have been achieved on catalytic performance. Due to the attention to environmental protection and energy saving, recently new synthetic methods on zeolites have been discovered. Methods like ion-thermal route and solvent-free synthesis need little water in the synthesis process and hence reduce the waste water and pressure in the reaction, which shows a great industrial significance on green energy efficient production.However, there are few works reporting how to use these green synthetic methods that control the morphology of zeolites. The dissertation introduces a method to control the morphology of aluminophosphates zeolites by solvent-free synthesis by using the easily accessible surfactant such as cetyltrimethylammonium bromide (CTAB) on the several important zeolites to control their morphology. The method helps to successfully achieve different morphologies of AFI (SAPO-5and APO-5), SAPO-11and SAPO-34. It is demonstrated that this morphological control method is simple, energy-saving, environmental friendly and popular. In the second chapter, it is illustrated that the plate-like SAPO-5and APO-5are successfully synthesized. And the thickness can be changed by adjusting the amount of additive CTAB, which leads to achieving50-200nm plate-like morphology. A series of characterization can prove the change, formation process and mechanism of the new morphology. Besides, the plate-like morphology benefits the spread of the reactants in the catalytic reaction products, which may offer great potential for development the application of SAPO-5in industrial catalysis.In the third chapter, successful syntheses on other zeolites are continually introduced. As plate-like SAPO-11is achieved, it may increase the surface of the mesoporous structure of SAPO-34, SAPO-11is an important catalyst in hydrogenation reactions, while SAPO-34is considerable catalysts in the transformation of methanol to light olefins (MTO) in petrochemical process. The morphology research on these zeolites provides the new application value for them in industrial catalysis in the future.