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Preparation of supported palladium catalyst Fe3O4/SiO2/Pd and application of supported palladium catalyst Fe3O4/SiO2/Pd in Suzuki reaction

A technology of supported palladium and catalyst, which is applied in the field of preparation of supported palladium catalyst Fe3O4/SiO2/Pd, can solve the problems of poor controllability of synthesis process conditions, poor experimental stability, and easy aggregation of particles, so as to be beneficial to environmental protection, The effect of easy separation and simple synthesis process

Inactive Publication Date: 2015-06-03
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are some research institutes in China that have researched in this area, but there is still a big gap compared with foreign research. The main problems are poor controllability of synthesis process conditions, poor experimental stability, easy agglomeration of particles, uneven particle size, etc. question

Method used

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  • Preparation of supported palladium catalyst Fe3O4/SiO2/Pd and application of supported palladium catalyst Fe3O4/SiO2/Pd in Suzuki reaction
  • Preparation of supported palladium catalyst Fe3O4/SiO2/Pd and application of supported palladium catalyst Fe3O4/SiO2/Pd in Suzuki reaction
  • Preparation of supported palladium catalyst Fe3O4/SiO2/Pd and application of supported palladium catalyst Fe3O4/SiO2/Pd in Suzuki reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: Fe 3 o 4 / SiO 2 / Preparation of Pd

[0034] (1) Preparation of simulated biological beneficiation tailing liquid: use Thiobacillus ferrooxidans to prepare the tailing liquid produced in simulated biological beneficiation and coal biodesulfurization. g / L, potassium chloride: 0.1g / L, dipotassium hydrogen phosphate: 0.5g / L, magnesium sulfate heptahydrate: 0.5g / L, calcium nitrate: 0.01g / L; b, inoculate Thiobacillus ferrooxidans Add 9.0g / 200mL ferrous sulfate heptahydrate culture solution to the bacterial culture solution, put the culture solution in a Erlenmeyer flask, wrap the mouth of the bottle with two layers of medical gauze, and place it on a constant temperature shaker at 28-30°C for shaking culture , after one week of bacterial culture, more than 95% of the Fe in the culture solution 2+ Oxidized by bacteria to Fe 3+ , the number of bacteria reaches 6×10 7 ~8×10 7 / mL, the main components of the solution are basically the same as the treated biom...

Embodiment 2

[0041] Example 2: figure 1 Among them, a and b are transmission electron microscopes of Fe3O4 and SiO2-coated Fe3O4 magnetic microspheres, respectively. Depend on figure 1 a It can be seen that the prepared magnetic nanometer has a regular octahedral structure. The dispersion is uniform, and the particle size is about 30 nanometers. figure 1 In b, silicon dioxide has been coated on ferric oxide nanoparticles, and the core-shell structure is more obvious. During the coating process, some of the silica coated a single nanoparticle, and some coated multiple nanoparticles, and the shape of the coating changed with the Fe 3 o 4 changes in shape. The monodispersity of the magnetic composite microspheres is better. The particle diameter of the silicon dioxide magnetic composite microsphere is 35-50 nm. From figure 1 c It can be seen that the fine particles are evenly coated on the surface of the magnetic composite microspheres. It can be seen from the literature that the part...

Embodiment 3

[0042] Example 3: figure 2 , 3 It is the X-ray diffraction pattern of magnetic iron ferric oxide nanoparticle powder and silicon dioxide magnetic nanoparticle. According to the standard spectrum data (JCPDS Card No.85-691), ferric oxide nanoparticles ( figure 2 ) diffraction characteristic peaks correspond to the (220), (311), (400), (422), (511), (440) crystal planes of the crystal respectively, and it can be seen that the magnetic nanoparticles are spinel structures. In silica magnetic microspheres ( image 3 ) in the XRD spectrum, 2θ is around 25° and amorphous SiO appears 2 The characteristic diffraction peak and the crystal plane of the characteristic peak of ferric oxide are present, and the peak shape becomes wider, indicating that silicon dioxide is coated on the surface of ferric oxide, and the coating state is amorphous. Figure 4 It is the XRD spectrum of palladium-coated magnetic microspheres. According to the standard spectrum, Fe 3 o 4 There are six char...

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Abstract

The invention discloses a supported palladium catalyst Fe3O4 / SiO2 / Pd for Suzuki reaction, and a preparation method of the supported palladium catalyst Fe3O4 / SiO2 / Pd. The compound is a supported palladium catalyst material containing Fe3O4 / SiO2 / Pd, obtained by composite reaction of a precursor-based Fe3O4 / SiO2 composite particles and Pd; the supported palladium catalyst Fe3O4 / SiO2 / Pd has the molecular characteristics that the compound structure contains a magnetic nanometer material Fe3O4 and porous absorption materials SiO2 and Pd; the supported palladium catalyst has relatively good magnetism, is easy to recover and reuse, and is a relatively ideal material as the supported palladium catalyst. The supported palladium catalyst is simple in synthesis route, mild in reaction condition, relatively high in yield and convenient to apply; post-treatment is simple; meanwhile, a secondary resource generated in biological mineral separation preparation and simulation and coal biological desulphurization by adopting thiobacillus ferrooxidans as a raw material; and a reference is provided for a comprehensive utilization technology of developing a metallurgical tail liquid or a desulphurization waste solution.

Description

technical field [0001] The present invention relates to the material of loaded catalyst, be specifically related to a kind of loaded palladium catalyst Fe 3 o 4 / SiO 2 / Pd preparation method and its application as a catalyst in the Suzuki reaction. Background technique [0002] Thiobacillus ferrooxidans (T.f) was first isolated from mine acid wastewater by Clomer and Hinkle in 1947. It is mainly used in biometallurgy, coal desulfurization, waste gas, wastewater treatment and other fields. When Thiobacillus ferrooxidans is used for microbial desulfurization of coal, iron and sulfur in pyrite in coal are finally oxidized to Fe 3+ and SO 4 2- dissolved in the leachate. As the leaching process proceeds, the total iron (Fe 2+ and Fe 3+ ) ion concentration vs. SO 4 2- Continuous improving. [0003] Taking chalcopyrite as an example, the overall reaction equation of Thiobacillus ferrooxidans microbial metallurgy process is as follows: [0004] [0005] After the biom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89C07B37/00C07D209/86
Inventor 吴振玉朱维菊唐义武古莉娜李村
Owner ANHUI UNIVERSITY
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