Inorganic Chemicals Industry ›› 2022, Vol. 54 ›› Issue (5): 144-150.doi: 10.19964/j.issn.1006-4990.2021-0566

• Catalytic Materials • Previous Articles    

Synthesis and characterization of silicoaluminophosphate molecular sieve from illite

LU Jing1(),CHEN Zhiping1,2,3(),LI Jianwei1,2,3,QU Ying1,ZHOU Wenwu1,2,3,YANG Zhiyuan1,2,3,ZHOU Anning1,2,3   

  1. 1.School of Chemistry and Chemical Engineering,Xi′an University of Science and Technology,Xi′an 710054,China
    2.State Key Laboratory of Green and Safe Coal Development in Western China
    3.Key Laboratory of Coal Resources Exploration and Comprehensive Utilization,Ministry of Natural Resources
  • Received:2021-09-16 Online:2022-05-10 Published:2022-05-31
  • Contact: CHEN Zhiping E-mail:17835419414@163.com;cupczp@163.com

Abstract:

Illite was activated by alkali fusion activation method,and the effect of calcination temperature,calcination time,mineral particle size,and mineral?alkali ratio on the activation of illite was systematically investigated.SAPO-11 molecular sieve was synthesized by hydrothermal method with activated illite as the main silicon and aluminum sources.The effect of synthesis conditions such as the type of template,the amount of template,the feeding Si/Al molar ratio and crystallization temperature on the structure and properties of the product was systematically investigated.XRD,N2 adsorption-desorption,SEM and TEM were used to analyze and characterize the activated products and synthesized molecular sieves.The results showed that the optimal alkali fusion activation conditions of illite were calcination temperature of 800 °C,calcination time of 90 min,illite particle size of 75 μm,and ore?base mass ratio of 1∶0.8.After activation,the crystal structure of illite was basically completely destroyed.The activated products were mainly high?activity low?polymerized silicate aluminates with high chemical reactivity.When n(Al2O3)∶n(P2O5)∶n(template)∶n(SiO2)∶n(H2O) was 1∶1∶1∶0.5∶50,the hydrothermal crystallization temperature was 190 °C,and the crystallization time was 24 h,the pure SAPO-11 molecular sieve with high crystallinity was successfully synthesized.The synthesized SAPO-11 molecular sieve had large specific surface area,and the sample was mainly composed of ellipsoidal particles with particle size of 1~3 μm.This synthesis method enriched the raw material source of SAPO molecular sieve,and expanded the high value?added utilization way of illite in China.

Key words: illite, alkali fusion activation, SAPO-11 molecular sieve, silicoaluminophosphate

CLC Number: