Pd-loaded Ti/CeO2 nano compound type catalyst as well as preparation method and application thereof

A composite, catalyst technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problem of limited cerium cations and oxygen holes, low catalytic activity, The problem of high industrial cost, to achieve the effect of easy industrial production, high catalytic performance, and simple raw materials

Inactive Publication Date: 2018-11-23
杭州同久净颢科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the loaded amount of noble metal of this catalyst is 1.8~4.5wt%, is relatively large, and industrial cost is high
[0005] Titanium dioxide TiO 2 As one of the common catalyst supports, it has been widely used, and TiO 2 It has the disadvantages of wide band gap and easy recombination of electron-hole pairs, which makes TiO 2 Catalytic activity is low
However, pure cerium oxide has limited cerium cations and oxygen vacancies, resulting in low catalytic activity.

Method used

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  • Pd-loaded Ti/CeO2 nano compound type catalyst as well as preparation method and application thereof
  • Pd-loaded Ti/CeO2 nano compound type catalyst as well as preparation method and application thereof
  • Pd-loaded Ti/CeO2 nano compound type catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1) Pd loaded Ti / CeO 2 Preparation of nanocomposite catalysts:

[0040]Dissolve 0.3907 g of cerium nitrate hexahydrate in 20 mL of a mixed solvent of ethanol and water (ethanol: water = 7:1), add 34 uL of tetrabutyl titanate, stir at room temperature for 20 min, then add the ethanol solution of pyromellitic acid (0.254g of pyromellitic acid dissolved in 20mL of ethanol), the above mixture was heated in an 80°C oil bath for 1h, quenched by adding water, and dried by centrifugation to obtain a white precipitate with a yield of 78%.

[0041] Put the obtained white precipitate in a muffle furnace and sinter at 500°C for 3h to obtain Ti / CeO 2 oxide. Dissolve 60mg of polyvinylpyrrolidone in 80mL of glycerol, add 100mg of Ti / CeO 2 Oxides, placed in an oil bath at 120°C, added an aqueous solution of potassium tetrachloropalladate (8mg potassium tetrachloropalladate dissolved in 1.2mL water), stirred at constant temperature for 2h, and then dried by high-speed centrifugation. ...

Embodiment 2

[0049] 1) Pd loaded Ti / CeO 2 Preparation of nanocomposite catalysts:

[0050] Dissolve 0.3096 g of cerium acetate in a mixed solvent of 20 mL of ethanol and water (ethanol: water = 5:1), add 34 uL of tetraisopropyl titanate, stir at room temperature for 20 min, then add an ethanol solution of phthalic acid ( 0.1661g of phthalic acid was dissolved in 20mL of ethanol), the above mixture was heated in an oil bath at 50°C for 1h, quenched by adding water, and dried by centrifugation to obtain a white precipitate with a yield of 75%.

[0051] Put the obtained white precipitate in a muffle furnace and sinter at 400°C for 5h to obtain Ti / CeO 2 oxide. Dissolve 40mg of polyvinylpyrrolidone in 80mL of isopropanol and add 100mg of Ti / CeO 2 Oxides, placed in an oil bath at 70°C, added an aqueous solution of sodium tetrachloropalladate (10 mg sodium potassium tetrachloropalladate dissolved in 1.2 mL water), stirred at constant temperature for 4 hours, and then dried by high-speed centri...

Embodiment 3

[0057] 1) Pd loaded Ti / CeO 2 Preparation of nanocomposite catalysts:

[0058] Dissolve 0.3096 g of cerium acetate hydrate in 20 mL of a mixed solvent of ethylene glycol and water (ethylene glycol: water = 10:1), add 5 uLg of titanium tetrachloride, stir at room temperature for 20 min, and then add ethyl citric acid Diol solution (0.192g of citric acid dissolved in 20mL of ethylene glycol), the above mixture was heated in an oil bath at 50°C for 1h, quenched with water, and dried by centrifugation to obtain a white precipitate with a yield of 82%.

[0059] Put the obtained white precipitate in a muffle furnace and sinter at 400°C for 5h to obtain Ti / CeO 2 oxide. Dissolve 80mg of polyvinylpyrrolidone in 80mL of ethylene glycol, add 100mg of Ti / CeO 2 Oxides, placed in an oil bath at 100°C, added an aqueous solution of palladium chloride (10.6 mg of potassium palladium tetrachloropalladate dissolved in 1.2 mL of water), stirred at constant temperature for 4 hours, and then drie...

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Abstract

The invention discloses a Pd-loaded Ti/CeO2 nano compound type catalyst. A Ti-doped CeO2 nanosheet is taken as a carrier, and a transition metal Pd element is loaded on the carrier, wherein the load of the Pd element is less than or equal to 0.19 wt%. The invention further discloses a preparation method of the Pd-loaded Ti/CeO2 nano compound type catalyst, the method comprises the following steps:taking ethyl alcohol as a solvent, organic acid and inorganic salt as raw materials and water as a precipitant to prepare a rare earth oxide, then taking ethanediol and the like as reducing agents, enabling Pd nano particles to be loaded on a Ti-doped CeO2 nanosheet carrier, the prepared nano material has uniform morphology, various doped elements are uniformly distributed, and the Pd-loaded Ti/CeO2 nano compound type catalyst has a good catalytic reduction effect on p-nitrophenol, high reusability and a potential application value in the sewage treatment aspect.

Description

technical field [0001] The invention belongs to the field of nanomaterial preparation and catalysis, in particular to a Pd-loaded Ti / CeO 2 Nanocomposite catalyst and its preparation method and application. Background technique [0002] With the continuous development of my country's industry, the pollution of water bodies by nitro compounds is becoming more and more serious, which has aroused widespread concern. p-Nitrophenol (4-NP) and aromatic nitro compounds are highly toxic and difficult to degrade. The reduction product of 4-NP, p-aminophenol (4-AP), has the advantages of low toxicity and easy degradation, and is a synthetic intermediate of many drugs. At present, the reduction of p-nitrophenol to p-aminophenol by catalytic reduction has been widely used. [0003] The key to reducing p-nitrophenol to p-aminophenol lies in the selection of the active components of the catalyst and the carrier. Noble metal catalysts (Au, Ag, Pd, Pt, PdCu, PtNi, and AuCu, etc.) have go...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01J35/02C02F1/70C02F101/34C02F101/38
CPCB01J23/63B01J35/023C02F1/70C02F2101/345C02F2101/38
Inventor 孙维林岳艳孙启杭凌君
Owner 杭州同久净颢科技有限责任公司
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