Chinese Journal of Catalysis

Chinese Journal of Catalysis ›› 2009, Vol. 30 ›› Issue (1): 60-64.

• Articles • Previous Articles     Next Articles

Effects of Swelling Agents Amount, pH Value of the System, and the SiO2/Al2O3 Ratio of MCM-22(P) on the Synthesis of ITQ-2 Zeolite

WANG Baoyu1*, WU Jianmei2, YUAN Zhongyong3, Xiang Shouhe3   

  1. 1 College of Chemistry and Chemical Engineering, Luoyang Normal University, Luoyang 471022, Henan, China; 2 The Institute of Seawater Desalination and Multipurpose Utilization, SOA, Tianjin 300192, China; 3 Institute of New Catalytic Materials Science, College of Chemistry, Nankai University, Tianjin 300071, China
  • Received:2009-01-25 Online:2009-01-25 Published:2012-10-17

PDF (PC)

877

Abstract: The amount of swelling agents (CTMABr, TPAOH) and the pH value of the synthesis system were the most important factors for the intercalation swelling of CTMA+ into the sheets of MCM-22(P). The well-swollen MCM-22(P) could be o btained when MCM-22(P)∶CTMABr∶40%TPAOH∶H2O mass ratio was 1∶1∶1.1∶16. With the pH value decreasing, the desiliconization of MCM-22(P), which resulted in a decre a se of the SiO2/Al2O3 ratios of ITQ-2, greatly decreased, the yield of ITQ - 2 zeolite significantly increased, and the ultrasonic exfoliation process becam e more accessible.The MCM-41 mesophase could be avoided when the exfoliat ion process was performed at lower pH value.

Key words: MCM-22 zeolite, cetyltrimethylammonium bromide (CTMABr), tetrapropylammonium hydroxide (TPAOH), intercalation swelling, ultrasonic exfoliation, ITQ-2 zeolite