Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (9): 2742.doi: 10.7503/cjcu20210070

• Inorganic Chemistry • Previous Articles     Next Articles

Post-synthesis of Ti-MWW Zeolite via Titanium Incorporation in Liquid Acid Solution

LUO Qiangqiang1,2, JIN Shaoqing2(), SUN Hongmin2, YANG Weimin1,2()   

  1. 1.School of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China
    2.State Key Laboratory of Green Chemical Engineering and Industrial Catalysis,Sinopec Shanghai Research Institute of Petrochemical Technology,Shanghai 201208,China
  • Received:2021-01-29 Online:2021-09-10 Published:2021-09-08
  • Contact: JIN Shaoqing E-mail:jinsq.sshy@sinopec.com;yangwm.sshy@sinopec.com
  • Supported by:
    the National Key Research & Development Program of China(2017YFB0702800);the National Natural Science Foundation of China(21603277)

Abstract:

B-MWW zeolite precursor was first hydrothermally synthesized with less amount of boric acid and piperidine under the condition of sodium hydroxide introduced, and then the incorporation of titanium was performed in liquid acid solution to obtain Ti-MWW zeolite with high crystallinity. With the help of powder X-ray diffraction, N2 adsorption-desorption characterization, UV-Vis and UV Raman spectroscopies, the effects of parameters including Si/Ti ratio and temperature on the texture properties, the state of titanium species and the catalytic performance in 1-hexene epoxidation of obtained Ti-MWW zeolite were investigated. The Si/Ti ratio and temperature beneficial for titanium incorporation are 30 and 373 K, respectively. Moreover, the catalytic performance of the obtained Ti-MWW zeolite in 1-hexene epoxidation can be significantly improved with a small amount of ammonium fluoride added during post-synthesis. This study not only demonstrates the deboration-based titanium incorporation mechanism during acid treatment of Ti-MWW zeolite precursor, but also provides a new method for the synthesis of Ti-MWW zeolite.

Key words: Ti-MWW zeolite, B-MWW zeolite precursor, Acid solution, Post-incorporation of titanium, 1-Hexene epoxidation

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