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Citation: HE Hong-Yun, LI Yan-Feng, HE Zhen, YU Ling, PANG Wen-Qin. Synthesis and Characterization of All-Si-β Zeolites and Their Catalytic Activity for Hydroxylation of Phenol[J]. Chinese Journal of Applied Chemistry, ;2007, 24(7): 790-795. shu

Synthesis and Characterization of All-Si-β Zeolites and Their Catalytic Activity for Hydroxylation of Phenol

HE Hong-Yun ^a,, ,
LI Yan-Feng ^a ,
HE Zhen ^a ,
YU Ling ^a ,
PANG Wen-Qin ^b

1.
a College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081;
2.
b State Key Laboratory of Inorganic Synthesis & Preparative Chemistry, Jilin University, Changchun

Corresponding author: HE Hong-Yun,
Received Date: 29 August 2006
Available Online: 3 December 2006
Fund Project: 湖南省自然科学基金(04JJ40011)资助项目 (04JJ40011)

All-Si-β zeolites (Si/Al>1 200) were synthesized under hydrothermal conditions with fumed silica (SiO₂) as the silica source,tetraethyl ammonium hydroxide (TEAOH) as the template and sodium fluoride (NaF) as the mineral agent.The effects of the chemical composition of the starting materials on the crystallization of All-Si-β zeolites were investigated.The structural characteristics of the products were determined by means of XRD,IR,TG/DTA and SEM.The results indicate that all-Si-β zeolites can be synthesized from the mixture at a ratio of n(SiO₂):n((TEA)₂O):n(H₂O):n(NaF)=60:(17~18):(480~660):(5~40);the gels obtained were then transferred to a 20 mL tetrafluoroethylene-lined stainless-steel autoclave and kept in oven at 140℃ for 12 d.All-Si-β zeolites were used as catalysts in the hydroxylation of phenol with H₂O₂ as the oxidant.The results show that all-Si-β zeolites have high catalytic activity.When reaction temperature was 80℃,reaction time 6 h,m(Catalyst):m(Phenol)=1:20,m(Phenol)/m(H₂O)=0.6 and n(Phenol)/n(H₂O₂)=2,the final conversion of phenol was 34.6%,the effective conversion of H₂O₂ was 61.2%,the yield selectivities for CAT and HQ were 69.8% and 27.0% respectively.
- All-Si-Beta zeolite,
- catalysis,
- phenol,
- hydroxylation
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