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One-pot method for preparing gamma-Al2O3 supported Au-Pd catalyst

A catalyst, au-pd technology, applied in the field of preparation of γ-Al2O3-loaded Au-Pd catalyst, can solve the problems of easy sintering of metal nanoparticles, difficult control of conditions, cumbersome synthesis process, etc., and achieve excellent selective oxidation performance of benzyl alcohol , The synthesis process is simple and easy, and the preparation process is simple

Inactive Publication Date: 2019-07-09
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Generally, the preparation methods of supported nanocatalysts mainly include impregnation method, deposition-precipitation method, co-precipitation method, ion exchange method, etc., but most of the traditional synthesis methods have poor dispersion of active components, easy sintering of metal nanoparticles, or synthesis process. Complicated, conditions are not easy to control and other issues

Method used

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  • One-pot method for preparing gamma-Al2O3 supported Au-Pd catalyst
  • One-pot method for preparing gamma-Al2O3 supported Au-Pd catalyst
  • One-pot method for preparing gamma-Al2O3 supported Au-Pd catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Example 1: At room temperature, 2.414g AlCl 3 ·6H 2 O and 2.28 g NaAlO 2 Dissolve in 25ml distilled water. in AlCl 3 Add 0.41g MPTMS dropwise in the solution, according to Al 2 o 3 The mole of / MPTMS is equal to 10:1; the AlCl 3 with NaAlO 2 The solution was poured into a beaker in parallel to produce a white precipitate. The resulting mixture was stirred at room temperature for 1.5h, and 2.1ml of 0.024mol / L PdCl was slowly added dropwise. 2 solution and 4.25ml of 0.024mol / L HAuCl 4Suction filtration and washing are then performed to obtain an aluminum hydroxide colloid filter cake containing Au and Pd precursors. Add 2.5g of P123 to 25ml of deionized water, stir until clear, then mix the P123 solution with the aluminum hydroxide colloidal filter cake, beat and stir for 4h. The beaten product was dried in an oven at 100°C for 12 hours, then heated to 500°C in a muffle furnace at a rate of 2°C / min, and then roasted at a constant temperature of 500°C for 3 hours....

Embodiment 2

[0025] Embodiment 2: at room temperature, respectively 2.414g AlCl 3 ·6H 2 O and 2.28 g NaAlO 2 Dissolve in 25ml of distilled water respectively. in AlCl 3 Add 0.26g MPTMS dropwise in the solution, according to Al 2 o 3 The molar ratio of / MPTMS is equal to 15; the AlCl 3 with NaAlO 2 The solution was poured into a beaker in parallel to produce a white precipitate. The resulting mixture was stirred at room temperature for 1.5 h, and 2.1 ml of 0.024 mol / L PdCl was slowly added dropwise. 2 solution and 4.25ml, 0.024mol / L of HAuCl 4 Suction filtration and washing are then performed to obtain an aluminum hydroxide colloid filter cake containing Au and Pd precursors. Add 2.5g of P123 to 25ml of deionized water, stir until clear, then mix the P123 solution with the aluminum hydroxide colloidal filter cake, beat and stir for 4h. The beaten product was dried in an oven at 100°C for 12 hours, then heated to 500°C in a muffle furnace at a rate of 2°C / min, and then roasted at a ...

Embodiment 3

[0026] Embodiment 3: at room temperature, respectively 2.414g AlCl 3 ·6H 2 O and 2.28 g NaAlO 2 Dissolve in 25ml of distilled water respectively. in AlCl 3 Add 0.26g MPTMS dropwise in the solution, according to Al 2 o 3 The molar ratio of / MPTMS is equal to 20; the AlCl 3 with NaAlO 2 The solution was poured into a beaker in parallel to produce a white precipitate. The resulting mixture was stirred at room temperature for 1.5 h, and 2.1 ml of 0.024 mol / L PdCl was slowly added dropwise. 2 solution and 4.25ml, 0.024mol / L of HAuCl 4 Suction filtration and washing are then performed to obtain an aluminum hydroxide colloid filter cake containing Au and Pd precursors. Add 2.5g of P123 into 25ml of deionized water, stir until clear, then mix the P123 solution with the aluminum hydroxide colloidal filter cake, beat and stir for 4h. The beaten product was dried in an oven at 100°C for 12 hours, then heated to 500°C in a muffle furnace at a rate of 2°C / min, and then roasted at ...

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Abstract

The invention provides a simple and convenient method for preparing gamma-Al2O3 supported Au-Pd catalyst. The gamma-Al2O3 supported Au-Pd catalyst is prepared in one pot by using inorganic salt AlCl3.6H2O and NaAlO2 as aluminum sources, HAuCl4 as a gold source and PdCl2 as a palladium source in the presence of coupling agent (3-mercaptopropyl)trimethoxysilane (MPTMS), and an influence of the MPTMScontent on the benzyl alcohol oxidation reaction performance of catalyst is investigated; the presence of the coupling agent allows active component Au and Pd to be effectively supported onto the gamma-Al2O3 carrier; and the prepared catalyst has a benzaldehyde yield of 74.9%. The method provided by the invention has a simple preparation process without the need of high-temperature crystallization, and reduces costs; and the obtained catalyst has a higher gold-palladium dispersion degree and a smaller Au-Pd nanometer size.

Description

technical field [0001] The present invention designs a preparation gamma-Al 2 o 3 A facile method for supported Au-Pd catalysts. The preparation process of the method is simple, and the obtained catalyst has better performance. Inorganic salt AlCl 3 ·6H 2 O and NaAlO 2 As aluminum source, PluronicP123 as structure directing agent, MPTMS as coupling agent, HAuCl 4 Gold source, PdCl 2 Preparation of Mesoporous γ-Al as Palladium Source 2 o 3 Supported Au-Pd nanocatalysts. Background technique [0002] At present, the "green" production processes of benzaldehyde mainly include toluene oxidation, reduction and direct oxidation of benzyl alcohol. Among them, the toluene oxidation method has the defects of low product yield and many by-products, which limit its industrial application, while the reduction method has no market competitiveness due to the high production cost of the hydrogenation reduction process. The direct oxidation of benzyl alcohol has a good applicatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/52
CPCB01J23/52
Inventor 吴萍萍王悦白鹏
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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