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Citation: ZHONG Sheng-Liang, ZHANG Mai-Sheng, SU Qiang. Role of Lanthanum Double Salt in Rapid Synthesis of Zeolite 4A under Microwave Heating[J]. Chinese Journal of Applied Chemistry, ;2005, 22(8): 865-869. shu

Role of Lanthanum Double Salt in Rapid Synthesis of Zeolite 4A under Microwave Heating

1.
School of Chemistry and Chemical Engineering, Sun Yat-Sen(Zhongshan) University, Guangzhou 510275

Corresponding author: ZHANG Mai-Sheng,
Received Date: 12 October 2004
Available Online: 29 January 2005
Fund Project: 广东省科技攻关基金(2002C31601) (2002C31601)广州市科技重点攻关基金(2003Z2-D2081) (2003Z2-D2081)广州市基础研究基金(2002G1-C0351) (2002G1-C0351)北京大学稀土材料化学与应用国家重点实验室开放课题基金(200409)资助项目 (200409)

Zeolite 4A was rapidly synthesized under microwave heating,and the effect of the addition of lanthanum sulfate and sodium sulfate (LNS for short) on the synthesis was studied.It was found that with the addition of LNS the crystallization rate of zeolite 4A almost doubled,and the crystallization rate in microwave field was about ten times faster than that under conventional heating.The whiteness of the products obtained in microwave field was 94%,the calcium ions exchange capacity 310 mg CaCO₃/g dry zeolite,and the average particle size 2.561 μm.With the addition of LNS,the whiteness was 96%,the calcium ion exchange capacity 318 mg CaCO₃/g dry zeolite,and the average particle size 1.958 μm.Moreover,the LNS acts as a modulizer,and the crystal form of zeolite 4A became spherical with the addition of LNS.
- zeolite 4A,
- double salt of lanthanum sulfate and sodium sulfate,
- microwave heating
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