A preparation method of a porous alumina shell material that can improve the sintering resistance of noble metal nanoparticles
A technology of porous alumina and nanoparticles, applied in the direction of metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, catalyst protection, etc., can solve the problem of low shell porosity, cumbersome operation, and unfavorable active sites Expose the problems of reaction substrate diffusion and achieve the effect of simple operation, mild conditions and rich design ideas
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Embodiment 1
[0023] (a) 1.0 g Ce(NO 3 ) 3 . 6H 2 O was dissolved in 1 ml of deionized water, and 1 ml of CH was added with stirring 3 COOH and 30 ml ethylene glycol form a homogeneous solution, which is heated at 180°C for 200 min. Cool to room temperature, centrifuge, wash with water and ethanol, and dry to obtain spherical CeO 2 carrier material;
[0024] (b) 0.3 g spherical CeO 2 Disperse in 100 ml deionized water, sonicate to disperse, then add 1.254ml AuCl 3 ·HCl·4H 2 O solution was stirred for 1 h. Adjust the pH to neutral with NaOH solution (1 M). After standing for 30 min, 2 ml NaBH 4 (0.01 g) in water was added dropwise to the above solution. After stirring for 10 min, the spherical CeO was obtained by centrifugation, washing and drying. 2 - Au material;
[0025] (c) The above 20 mg spherical CeO 2 -Au, 10 mg Al(NO 3 ) 3 9H 2 O and 20 mg terephthalic acid (H 2 BDC) dispersed in 5 ml dimethylformamide (DMF) and 5 ml H 2 The mixed solution of O was heated in a wat...
Embodiment 2
[0028] (a) 1.0 g Ce(NO 3 ) 3 . 6H 2 O was dissolved in 1 ml of deionized water, and 1 ml of CH was added with stirring 3 COOH and 30 ml ethylene glycol form a homogeneous solution, which is heated at 180°C for 200 min. Cool to room temperature, centrifuge, wash with water and ethanol, and dry to obtain spherical CeO 2 carrier material;
[0029] (b) 0.3 g spherical CeO 2 Disperse in 100 ml deionized water, sonicate to disperse, then add 1.254ml AuCl 3 ·HCl·4H 2 O solution was stirred for 1 h. Adjust the pH to neutral with NaOH solution (1 M). After standing for 30 min, 2 ml NaBH 4 (0.01 g) in water was added dropwise to the above solution. After stirring for 10 min, the spherical CeO was obtained by centrifugation, washing and drying. 2 - Au material;
[0030] (c) The above 20 mg spherical CeO 2 -Au, 30 mg Al(NO 3 ) 3 9H 2 O and 20 mg terephthalic acid (H 2 BDC) dispersed in 5 ml dimethylformamide (DMF) and 5 ml H 2 The mixed solution of O was heated in a wat...
Embodiment 3
[0033] (a) Weigh 1.30 g Ce(NO 3 ) 3 . 6H 2 O and 14.4 g NaOH were dissolved in 20 ml and 40 ml high-purity water respectively, and after the cerium nitrate was completely dissolved, they were added to the 100 ml polytetrafluoroethylene liner filled with NaOH under stirring. After continuing to stir for 30 min, the lining was transferred to a stainless steel reactor, sealed and hydrothermally reacted at 100 °C for 24 h, cooled to room temperature, centrifuged, washed with water and ethanol, and dried at 80 °C to obtain rod-shaped CeO 2 carrier material;
[0034] (b) 0.3 g rod-like CeO 2 Disperse in 100 ml deionized water, sonicate to disperse, then add 1.254ml AuCl 3 ·HCl·4H 2 O solution was stirred for 1 h. Adjust the pH to neutral with NaOH solution (1 M). After standing for 30 min, 2 ml NaBH 4 (0.01 g) in water was added dropwise to the above solution. After stirring for 10 min, after centrifugation, washing and drying, the rod-shaped CeO 2 - Au material;
[0035...
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