Use of Ultrasonic Processing at Early Stages of LTA Zeolite Synthesis from Metakaolin

作者：Gordina N E^*; Prokof'ev V Yu; Kul'pina Yu N; Petukhova N V; Gazakhova S I; Khmylova O E

来源：Glass and Ceramics, 2017, 73(9-10): 334-337.

DOI：10.1007/s10717-017-9884-5

• LTA zeolite
• metakaolin
• ultrasonic processing

The influence of ultrasonic processing (22 kHz) of a suspension of metakaolin, aluminum oxide, and sodium hydroxide with molar ratio Al2O3 center dot 2SiO(2): NaOH : Al2O3 = 6 : 12 : 2, followed by heat-treatment and hydrothermal crystallization on LTA zeolite synthesis, is investigated. It is found that by increasing the S : L ratio at the ultrasonic processing stage it is possible to increase the yield of the desired product. The optimal conditions of ultrasonic processing are determined (amplitude 8 mu m, time about 10 min). It is shown that under the optimal conditions the degree of crystallinity of LTA zeolite equals 98%. The mechanisms of LTA zeolite synthesis by means of ultrasonic processing and mechano-chemical activation are compared.

• 出版日期2017-1
• 单位北京化工大学