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Citation: RAO Weilan, PAN Zhiquan, XIANG Shouxin. Preparation of Rare Earth Solid Superacid and Catalysis on the Esterification Reactions of Stearic Acid[J]. Chinese Journal of Applied Chemistry, ;2011, 28(8): 907-912. doi: 10.3724/SP.J.1095.2011.00563 shu

Preparation of Rare Earth Solid Superacid and Catalysis on the Esterification Reactions of Stearic Acid

1.
Key Laboratory for Green Chemical Process of Ministry of Education, Wuhan Institute of Technology, Wuhan 430073

Corresponding author: PAN Zhiquan,
Received Date: 26 September 2010
Available Online: 20 December 2010
Fund Project: 湖北省高等学校优秀中青年科技创新团队(T200802) (T200802)湖北省自然科学基金重大项目(2008CDA031) (2008CDA031)

Nanometer hybrid rare earth solid superacid was prepared by sol-gel method.Tetrabutyl titanate was hydrolyzed and condensation polymerized,then doped with rare earth elements of Ce and La,respectively,by immersion process,and activated under certain temperatures to give a nanometer hybrid rare earth solid superacid catalyst.The structure and morphology of samples were characterized by FT-IR,SEM,and XRD.The results show that the SO₄^2- is bonded to the metal oxide by bridged bidentate coordination mode.XRD shows the crystal form is anatase,and SEM reveals the catalyst is globular shape.It also proves that the rare earth solid superacid catalysts exhibit high catalytic activity for the esterification of stearic acid.The precursor soaked in the solution c(Ce⁴⁺)=0.12 mol/L,c(H₂SO₄)=1.0 mol/L and the solution c(La³⁺)=0.07 mol/L,c(H₂SO₄)=1.25 mol/L for 10~14 h,then calcinated at 500~550℃ for 3 h to obtain the solid superacid catalysts.Under the optimum conditions,the yields of esterification can reach 97.8% and 96.7%,respectively,by using these catalysts.
- sol-gel method,
- anatase,
- nanometer titanium dioxide,
- rare earth solid superacid,
- stearic acid,
- esterification reaction,
- catalysis
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