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Dendritic silicon-titanium hybrid nanosphere loaded noble metal catalyst and preparation method thereof

A precious metal catalyst and dendritic silicon technology, which is applied in the field of nano-catalyst material preparation, can solve the problems of difficulty in controlling the hydrolysis rate of titanium precursors, uneven chemical composition of products, poor morphology reproducibility, etc., and achieve high-efficiency photolysis of aquatic products. Hydrogen, improved catalyst performance, easy-to-implement effects

Pending Publication Date: 2021-06-25
YANAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above two techniques for preparing dendritic silicon-titanium hybrid nanospheres have some disadvantages: the atomic deposition technique requires advanced equipment, the deposition rate is low and the preparation cost is high; the ammonia-assisted liquid phase deposition technique is difficult to control the hydrolysis rate of the titanium precursor, and the product Inhomogeneous chemical composition, poor morphology reproducibility

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  • Dendritic silicon-titanium hybrid nanosphere loaded noble metal catalyst and preparation method thereof
  • Dendritic silicon-titanium hybrid nanosphere loaded noble metal catalyst and preparation method thereof
  • Dendritic silicon-titanium hybrid nanosphere loaded noble metal catalyst and preparation method thereof

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Embodiment 1

[0043] See figure 1 , figure 1 It is a flowchart of a method for preparing a dendritic silicon-titanium hybrid nanosphere-supported noble metal catalyst provided by an embodiment of the present invention. The preparation method includes:

[0044] S1: Ultrasonic dispersion of dendritic mesoporous silica nanospheres in an organic solution of titanium precursor under negative pressure conditions to obtain a dispersed product;

[0045] The type of dendritic mesoporous silica nanospheres used in this embodiment is not particularly limited, and either natural or synthetic silica substrates can be used. The titanium precursor is preferably titanium tetrachloride, bis(acetylacetonato)diisopropyl titanate, tetrabutyl titanate or isopropyl titanate.

[0046] Specifically, step S1 includes:

[0047] 0.5 g of dendritic mesoporous silica nanospheres were ultrasonically dispersed in 5.0 mL of an organic solution containing titanium precursors, connected to a vacuum water pump, and ultra...

Embodiment 2

[0066] This example provides a method for preparing a dendritic silicon-titanium hybrid nanosphere-supported platinum nanoparticle catalyst. The preparation method includes:

[0067] Step 1: ultrasonically disperse 0.6g of dendritic mesoporous silica nanospheres in a round-bottomed flask containing 4.0mL of bis(acetylacetonato)diisopropyl titanate, connect to a vacuum water pump, and place under a pressure of -0.08MPa Ultrasonic dispersion was performed for 20 minutes to obtain a dispersed product.

[0068] Step 2: The dispersed product was washed with absolute ethanol for 3 times, and calcined at 600° C. for 8 hours.

[0069] Step 3: ultrasonically disperse the dendritic silicon-titanium hybrid nanospheres obtained above in a round-bottomed flask containing 50.0 mL of toluene, add 3-aminopropyltriethoxysilane, and react under reflux at 100° C. for 12 hours.

[0070] Step 4: The functionalized nanospheres were ultrasonically dispersed in 50.0 mL, 20 mmol / L sodium chloroplati...

Embodiment 3

[0072] This example provides another method for preparing a dendritic silicon-titanium hybrid nanosphere-supported gold nanoparticle catalyst. The preparation method of the present embodiment comprises:

[0073] Step 1: ultrasonically disperse 0.8g of dendritic mesoporous silica nanospheres in a round-bottomed flask containing 8.0mL of tetrabutyl titanate, connect a vacuum pump, and ultrasonically disperse at -0.1MPa pressure for 30 minutes to obtain a dispersed product .

[0074] Step 2: The dispersed product was washed with absolute ethanol for 4 times, and calcined at 800° C. for 3 hours.

[0075] Step 3: ultrasonically disperse the dendritic silicon-titanium hybrid nanospheres obtained above in a round-bottomed flask containing 50.0 mL of toluene, add 3-isocyanatopropyltriethoxysilane, and react under reflux at 120° C. for 6 hours.

[0076] Step 4: The functionalized nanospheres were ultrasonically dispersed in 50.0 mL, 30 mmol / L sodium chloroaurate solution, and 20.0 mL...

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Abstract

The invention discloses a dendritic silicon-titanium hybrid nanosphere loaded noble metal catalyst and a preparation method thereof. The preparation method comprises the steps of: ultrasonically dispersingdendritic mesoporous silicon dioxide nanospheres in an organic solution of a titanium precursor under a negative pressure condition to obtain a dispersion product; washing the dispersion product by using absolute ethyl alcohol, and calcining to obtain dendritic silicon-titanium hybrid nanospheres; ultrasonically dispersing the dendritic silicon-titanium hybrid nanospheres in toluene, and adding an organic silane coupling agent for reflux reaction to obtain functionalized nanospheres; and ultrasonically dispersing the functionalized nanospheres in an inorganic salt solution containing noble metal ions, dropwise adding a sodium borohydride solution, and carrying out centrifugal separation and drying to obtain the dendritic silicon-titanium hybrid nanosphere loaded noble metal catalyst. According to the method, the titanium precursor is extruded into the pore channels of the dendritic silicon dioxide nanospheres by means of negative pressure, the silicon-titanium hybrid nanospheres are generated through calcination, the process is simple, the deposition speed is high, and the chemical composition of the product is uniform.

Description

technical field [0001] The invention belongs to the technical field of preparation of nano-catalyst materials, and in particular relates to a dendritic silicon-titanium hybrid nanosphere-supported noble metal catalyst and a preparation method thereof. Background technique [0002] Dendritic mesoporous silica nanospheres have a three-dimensional central radial channel and a hierarchical pore structure. This special structure makes it have the characteristics of larger pore volume, higher specific surface area, and easier contact with the inner surface of the particle. Therefore, the material It is a promising new nanocatalyst carrier platform. Compared with traditional silica-supported noble metal catalysts (such as SBA-15 and MCM-41 with hexagonal structure), the performance of dendritic mesoporous silica nanosphere-supported noble metal catalysts is superior. The hierarchical pore structure can support more catalytic components, which increases the number of reactive sites...

Claims

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Application Information

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IPC IPC(8): B01J23/42B01J23/46B01J23/50B01J23/52B01J31/02B01J31/38B01J35/00B01J35/08C01B3/04C02F1/70C02F101/34C02F101/38
CPCB01J31/0274B01J31/38B01J23/50B01J23/42B01J23/52B01J23/464C01B3/042C02F1/70C01B2203/1094C01B2203/1041C02F2101/345C02F2101/38B01J35/393B01J35/51B01J35/39Y02E60/36
Inventor 王亚斌赵瑜黄亮珠李雪礼
Owner YANAN UNIV