Preparation method of one-shell multi-core yolk shell catalyst Pd @ HCS
A technology of nucleated egg yolk and catalyst, which is applied in the field of preparation of catalyst Pd@HCS, can solve the problems of reducing catalytic efficiency, reducing the contact area between reactant gas and Pd particles, etc., and achieves the effect of improving catalytic efficiency and increasing specific surface area.
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Embodiment 1
[0028] Example 1: A method for preparing a one-shell polynuclear yolk-shell catalyst Pd@HCS, the steps are as follows:
[0029] (1) Preparation of SiO 2 : Mix 62ml ethanol, 25ml deionized water and 1.5ml NH 3 ·H 2 O mixed solution was stirred at 25°C for 15 min, then 4.5ml TEOS was added and reacted for 2 h, the product was centrifuged and washed 3 times with ethanol to obtain SiO 2 ;
[0030] (2) SiO 2 -NH 2 Preparation: The prepared SiO 2 Ultrasonic dispersion in 180ml of isopropanol solution, stirring at 80°C for 5min, then adding 1.5ml of APTES, and keeping the temperature under reflux for 3h, cooling to room temperature, the product was centrifuged and washed 3 times with ethanol to obtain SiO 2 -NH 2 ;
[0031] (3)Pd / SiO 2 -NH 2 Synthesis of : First, the SiO 2 -NH 2Ultrasonic disperse in 100ml ethanol solution, stir at 35°C for 10min; then add 1ml H 2 PdCl 4 solution (0.075M), stirred for 2h; finally, added 300μl NaBH 4 solution (10wt%), reacted for 30min,...
Embodiment 2
[0034] Example 2: A method for preparing a one-shell polynuclear yolk-shell catalyst Pd@HCS, the steps are as follows:
[0035] (1) Preparation of SiO 2 : Mix 62ml ethanol, 25ml deionized water and 1.5ml NH 3 ·H 2 O mixed solution was stirred at 20°C for 15 min, then 4.5ml TEOS was added and reacted for 1 h, the product was centrifuged and washed twice with ethanol to obtain SiO 2 ;
[0036] (2) SiO 2 -NH 2 Preparation: The prepared SiO 2 Ultrasonic dispersion in 180ml of isopropanol solution, stirring at 70°C for 5min, then adding 1.5ml of APTES, and keeping the temperature at reflux for 2h, cooling to room temperature, the product was centrifuged and washed 3 times with ethanol to obtain SiO 2 -NH 2 ;
[0037] (3)Pd / SiO 2 -NH 2 Synthesis of : First, the SiO 2 -NH 2 Ultrasonic disperse in 100ml ethanol solution, stir at 30°C for 10min; then add 1ml H 2 PdCl 4 solution (0.075M), stirred for 1h; finally, added 300μl NaBH 4 solution (10wt%), reacted for 20min, and...
Embodiment 3
[0040] Example 3: A method for preparing a one-shell polynuclear yolk-shell catalyst Pd@HCS, the steps are as follows:
[0041] (1) Preparation of SiO 2 : Mix 62ml ethanol, 25ml deionized water and 1.5ml NH 3 ·H 2 O mixed solution was stirred at 30°C for 15min, then 4.5ml TEOS was added and reacted for 3h, the product was centrifuged and washed 4 times with ethanol to obtain SiO 2 ;
[0042] (2) SiO 2 -NH 2 Preparation: The prepared SiO 2 Ultrasonic dispersion in 180ml of isopropanol solution, stirring at 90°C for 5min, then adding 1.5ml of APTES, and maintaining the temperature at reflux for 4h, cooling to room temperature, the product was centrifuged and washed 4 times with ethanol to obtain SiO 2 -NH 2 ;
[0043] (3)Pd / SiO 2 -NH 2 Synthesis of : First, the SiO 2 -NH 2 Ultrasonic dispersion in 100ml ethanol solution, stirring at 40°C for 10min; then add 1ml H 2 PdCl 4 solution (0.075M), stirred for 3h; finally, added 300μl NaBH 4 solution (10wt%), reacted for ...
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