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摘要
The EU-1 zeolites contained Fe, Co, Ni heteroatoms were quickly synthesized through the hydrothermal crystallization procedure with laboratory self-made hexamethonium bromide (HMBr2) as a template. Studying the potential of crystallization process and relative crystallinity change in the crystallization process, we obtained colloid particle surface charge and kinetic parameters. The results show that metal Fe, Co, Ni introduced into the EU-1 zeolities had a very good role in promoting crystal nuclei formation. Iron, cobalt, nickel cations with empty d orbitals can accelerate the formation of oligomer silicon, the structures of which in the process of crystallization accelerated the nucleation and growth of crystals, leading to their nucleation time significantly to be shortened, the nucleation rate and crystal growth rate significantly to be speeded up, the apparent activation energy to be decreased. The apparent activation energy of nucleation E-n is greater than the apparent growth activation energy E-g and the nucleation process is the rate controlling step. So the high crystallization temperature is favourable for formating crystal nuclei of EU-1 zeolite which contained Fe, Co, Ni atoms and can accelerate the subsequent crystal growth process. Raising temperature needs to shorten the crystallization time appropriately, which is in order to prevent the emergence of other crystals. For zeolites synthesis, homogeneous and good dispersion gel-sol gel must be prepared at first, and the zeta potential is an important index of the surface charge properties and stability. Thus the change of it is essential for the synthesis of zeolites.
- 出版日期2013-10-10
- 单位中国石油大学（北京）; 太原理工大学
