Supported nano Au catalyst and method for preparing the same
A catalyst and nano-gold technology, which is applied in the field of supported nano-gold catalyst and its preparation, can solve the problems of short catalyst life, low conversion rate, and difficult recovery, and achieve the effect of small catalyst consumption, easy recycling, and uniform dispersion
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Embodiment 1
[0021] Preparation of Catalyst A. Take 0.03g chloroauric acid HAuCl 4 4H 2 O was dissolved in 100 mL of deionized water, and the pH value was adjusted to 5.0 with 1 M sodium hydroxide solution. Add 1.0 g Al to the above solution 2 o 3 , stirred and reacted at 70°C for 2h, filtered, and the solid product was washed with 30mL of 1M ammonia water, dried at 80°C for 4h, then impregnated with 2mL of a solution containing 0.008g of silver nitrate at room temperature for 10h, and dried at 80°C for 4h. The obtained solid product was added to a mixture containing 0.55 mL tetraethyl orthosilicate, 10 mL benzene, and 10 mL ethanol, stirred and reacted for 2 h at room temperature, filtered, washed with 30 mL ethanol, and then washed with 50 mL deionized water, at 80°C Drying for 4 hours and calcining at 400°C for 4 hours gave Catalyst A, whose composition is shown in Table 1.
Embodiment 2
[0023] Preparation of Catalyst B. Take 0.02g chloroauric acid HAuCl 4 4H 2 O was dissolved in 100 mL deionized water, and the pH value was adjusted to 6.0 with 1 M sodium hydroxide solution. Add 1.0 g Al to the above solution 2 o 3 , stirred at 90°C for 2h, filtered, washed the solid product with 30mL of 4M ammonia water, and dried at 200°C for 4h. This solid product contains 0.02g nitrate Cu(NO) with 2mL 3 ) 2 ·6H 2 The aqueous solution of O was soaked at room temperature for 10 h, dried at 200 °C for 4 h, and roasted at 500 °C for 4 h. The obtained solid product was added to a mixture containing 1.6 mL of butyl titanate, 10 mL of toluene, and 10 mL of methanol, stirred at room temperature for 2 h, filtered , washed with 60 mL of ethanol, then washed with 100 mL of deionized water, dried at 200°C for 4 hours, and calcined at 500°C for 4 hours to obtain catalyst B, whose composition is shown in Table 1.
Embodiment 3
[0025] Preparation of Catalyst C. Take 0.02g chloroauric acid HAuCl 4 4H 2 O was dissolved in 100 mL deionized water, and the pH value was adjusted to 3.0 with 1 M sodium hydroxide solution. Add 1.0 g Al to the above solution 2 o 3 , stirred at 20°C for 8h, filtered, washed the solid product with 30mL of 1M ammonia water, and dried at 60°C for 8h. This solid product contains 0.01g cerium nitrate Ce (NO 3 ) 3 ·6H 2 The aqueous solution of O was soaked at room temperature for 20 hours, dried at 60°C for 8 hours, and roasted at 200°C for 8 hours. The obtained solid product was added to a mixture containing 2.2 mL of tetraethylorthosilicate, 10 mL of toluene, and 10 mL of ethanol, and stirred at room temperature for 8 hours. Filter, wash with 30 mL of ethanol, then wash with 50 mL of deionized water, dry at 60°C for 8 hours, and calcined at 200°C for 8 hours to obtain Catalyst C, whose composition is shown in Table 1.
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