Beta zeolite is synthesized under hydrothermal conditions through template-seed method using tetraethylammonium hydroxide as template agent and adding seed crystal.The effects of crystallization time,crystallization temperature,the dosage of template agent and the amount of seed crystal on the synthesis of beta zeolite are studied.The optimal preparation conditions for beta zeolite from silica sol are finally determined,and H-β zeolite is prepared for catalyzing oleic acid to isomerize.Experimental results show that beta zeolite with high crystallinity is successfully synthesized under the conditions that crystallization temperature is 150℃,crystallization time is 48 h,n(H2O)/n(SiO2)= 18,n(TEAOH)/n(SiO2)= 0.3,and the amount of seed crystal is 10%(wt/wt).The conversion of oleic acid reaches 81%and the yield of iso-stearic acid approaches 75%when the isomerization of oleic acid is catalyzed by H-β zeolite,reaction temperature is 280℃,reaction has performed for 6 h,the content of water is 3%(wt/wt)and the dosage of catalyst is 8%(wt/wt).
NETL
NSTL
万方数据
