Plant reducing preparation method for nanogold catalyst used for synthesis of benzaldehyde
A catalyst and nano-gold technology, which is applied in the field of plant reduction preparation of nano-gold catalysts, can solve the problems of limited gold nanoparticles, achieve low gold loading, mild reduction reaction conditions, and simple processes
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Embodiment 1
[0018] Example 1: Preparation of Arborvitae leaf extract: Weigh 1.0 g of dried and pulverized Arborvitae leaf powder, add 100 mL of deionized water, place in a shaker (30° C., 150 rpm) and vibrate for 4 hours, take it out, and filter. Gained filtrate is the concentration of 10g / L of orientalis leaves extract.
[0019] Measure 30mL of the Arborvitae leaf extract and 30mL of chloroauric acid solution (1mM) in a 100mL Erlenmeyer flask and stir and mix it. The controlled reaction temperature is 30°C and the reaction time is 30min. The color of the reaction solution gradually changes from the previous light yellow. Turned reddish brown. The formation of nano-gold sol was verified by ultraviolet-visible absorption spectroscopy (UV-Vis) and transmission electron microscopy (TEM). Thereafter, add 0.591g carrier TS-1 to the nano-gold sol and stir and mix with it, control the temperature at 30°C, and the time is 90min, so as to obtain a turbid solution containing Au / TS-1 catalyst, and ...
Embodiment 2
[0021] Example 2: Mix 30 mL of Arborvitae leaf extract described in Example 1 with 30 mL of chloroauric acid solution (0.25 mM) in a 100 mL Erlenmeyer flask, control the reaction temperature to 30° C., and stir for 30 min. Then, 0.591 g of carrier TS-1 was added to the obtained nano-gold sol, the temperature was controlled at 30° C., and the mixture was stirred for 90 minutes. Then filter, wash, and dry to obtain the nano-gold catalyst (referred to as A2). Using 300mg of nano-gold catalyst A2, the catalyst evaluation is the same as in Example 1, and the results are shown in Table 1.
Embodiment 3
[0022] Example 3: Mix 35 mL of Arborvitae leaf extract described in Example 1 with 35 mL of chloroauric acid solution (2 mM) in a 100 mL Erlenmeyer flask, control the reaction temperature to 30° C., and stir for 30 min. Then, 0.690 g of carrier TS-1 was added to the obtained nano-gold sol, the temperature was controlled at 30° C., and the mixture was stirred for 90 minutes. Then filter, wash, and dry to obtain the nano-gold catalyst (referred to as A3). Using 300mg of nano-gold catalyst A3, the catalyst evaluation is the same as in Example 1, and the results are shown in Table 1.
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