Application of Nano-Au-Based Catalysts in the Synthesis of Formic Acid or Formate
A catalyst and nano-gold technology, which is applied in the field of preparation of nano-gold-based catalysts, can solve the problems of low activity of hydrogenation synthesis of formic acid, etc., and achieve good industrial application value and high stability.
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Embodiment 1
[0028] Embodiment 1, Au (3wt%) / SiO 2 - Preparation of Schiff catalyst:
[0029] Weigh 4.4g of 3-aminopropyltriethoxysilane and dissolve it in 100mL of deionized water, add 10mL of formaldehyde solution under the condition of stirring at 20°C, and continue stirring for 2h. The resulting white precipitate was filtered and washed with deionized water, and dried at 120 °C for 12 h to obtain the carrier Si0 2 -Schiff.
[0030] Weigh 1g Si0 2 -Schiff carrier, added to 150 mL of HAuCl with a concentration of 1.015 mmol / L 4aqueous solution, and stirred at 25 ° C. Then 15 mL of sodium borohydride solution with a molar concentration of 0.2 mol / L was added, and stirring was continued for 2 h. The obtained suspension was then transferred to a hydrothermal kettle and heated at 100° C. for 12 hours. After the kettle was naturally cooled to room temperature, the suspension was filtered, washed, and the resulting solid was dried in an oven to obtain the Schiff base-modified Au(3wt%) / SiO...
Embodiment 2
[0031] Embodiment 2, Pd (3wt%) / SiO 2 - Preparation of Schiff catalyst:
[0032] Weigh 4.4g of 3-aminopropyltriethoxysilane and dissolve it in 100mL of deionized water, add 10mL of formaldehyde solution under the condition of stirring at 20°C, and continue stirring for 2h. The resulting white precipitate was filtered and washed with deionized water, and dried at 120 °C for 12 h to obtain the carrier Si0 2 -Schiff.
[0033] Weigh 1g Si0 2 -Schiff carrier, add into 150mL palladium chloride (1.89mmol / L) solution, and stir at 25°C evenly. Then 15 mL of sodium borohydride solution with a molar concentration of 0.2 mol / L was added, and stirring was continued for 2 h. The obtained suspension was then transferred to a hydrothermal kettle and heated at 100° C. for 12 hours. After the kettle was naturally cooled to room temperature, the suspension was filtered, washed, and the resulting solid was dried in an oven to obtain the Schiff base-modified Pd (3wt%) / SiO 2 - Schiff catalyst ...
Embodiment 3
[0034] Embodiment 3, Pt (3wt%) / SiO 2 - Preparation of Schiff catalyst:
[0035] Weigh 4.4g of 3-aminopropyltriethoxysilane and dissolve it in 100mL of deionized water, add 10mL of formaldehyde solution under the condition of stirring at 20°C, and continue stirring for 2h. The resulting white precipitate was filtered and washed with deionized water, and dried at 120 °C for 12 h to obtain the carrier Si0 2 -Schiff.
[0036] Weigh 1g Si0 2 -Schiff support, added to 150 mL of a mixed solution of chloroplatinic acid (1.02 mmol / L), and stirred evenly at 25° C. Then 15 mL of sodium borohydride solution with a molar concentration of 0.2 mol / L was added, and stirring was continued for 2 h. The obtained suspension was then transferred to a hydrothermal kettle and heated at 100° C. for 12 hours. After the kettle is naturally cooled to room temperature, the suspension is filtered, washed, and the resulting solid is dried in an oven to obtain the Schiff base-modified Pt (3wt%) / SiO 2 ...
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