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Composite titanium oxide supported noble metal catalyst for hydrogen peroxide synthesis, and preparation method and application method thereof

A precious metal catalyst, composite titanium oxide technology, applied in metal/metal oxide/metal hydroxide catalyst, peroxide/peroxyhydrate/peroxyacid/superoxide/ozonide, physical/chemical process catalyst It can solve the problems of slow degradation of active intermediate anthraquinone, product pollution and high production cost, and achieve the effect of improving interface behavior, stable performance and easy control.

Inactive Publication Date: 2020-11-03
南京工业大学张家港产业学院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has the following significant disadvantages: high production cost; complex process flow, high energy consumption, and difficult process control; the active intermediate anthraquinone used in production will slowly degrade and produce a large number of toxic by-products to cause product pollution. further driving up production costs
[0003] For the prior art of the hydrogen-oxygen direct synthesis method, its main technical problem is: from the reaction pathway and thermodynamics, H 2 and O 2 It is easier to generate H on the surface of the catalyst 2 O, so in general, for H 2 o 2 Synthesis of active catalysts also for H 2 o 2 Oxygenolysis and degradation are also active, so researchers generally believe that the development of efficient and highly selective H 2 o 2 Synthetic catalysts are at the heart of the technology

Method used

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  • Composite titanium oxide supported noble metal catalyst for hydrogen peroxide synthesis, and preparation method and application method thereof
  • Composite titanium oxide supported noble metal catalyst for hydrogen peroxide synthesis, and preparation method and application method thereof
  • Composite titanium oxide supported noble metal catalyst for hydrogen peroxide synthesis, and preparation method and application method thereof

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Embodiment 1

[0031] A composite titanium oxide-supported noble metal catalyst for hydrogen peroxide synthesis, comprising:

[0032] Composite titanium oxide is used as the carrier, and the composite titanium oxide is titanium oxide compounded with a compound containing at least one element of phosphorus, sulfur, selenium, carbon, and silicon on the surface; at least one of palladium, gold, silver, and platinum is loaded on the carrier Metal.

[0033] Above, the compound is C 4 -C 20 organic phosphonic acid, C 4- C 20 thiols, C 4 -C 20 Selenate, C 4 -C 20 of sugar, C 4 -C 20 Alcohol, C 4 -C 20 Any of the silanes.

[0034] C 4 -C20 Alcohols include: furfuryl alcohol; C 4 -C 20 Organic phosphonic acids include: phenylphosphonic acid; C 4 -C 20 The thiols include: benzenethiol; C 4 -C 20 Selenates include: sodium selenite; C 4 -C 20 sugars include: glucose; C 4 -C 20 Silanes include: Octadecyltrichlorosilane.

[0035] The molar ratio of the compound to the titanium oxid...

Embodiment 2

[0047] A method for preparing a composite titanium oxide-supported noble metal catalyst for hydrogen peroxide synthesis, specifically comprising:

[0048] S1. Using an acid as a solvent to dissolve a metal salt to prepare a metal precursor solution. The metal precursor solution includes: at least one or a mixed solution of two or more of palladium, gold, silver, and platinum.

[0049] Above, the acid is one or a mixture of two or more of formic acid, hydrochloric acid, nitric acid or sulfuric acid.

[0050] The concentration of the metal precursor solution is 0.001-0.5 g / mL, preferably 0.001-0.2 g / mL.

[0051] S2. A compound containing at least one element of phosphorus, sulfur, selenium, carbon, and silicon is dissolved in water or an organic solution to form a dissolved solution, and titanium oxide is added to the dissolved solution, and after stirring, it is polymerized and then heated. Bottom firing to form composite titanium oxide.

[0052] Above, the compound is C 4 -...

Embodiment 3

[0064] An application method of a composite titanium oxide-supported noble metal catalyst for hydrogen peroxide synthesis, comprising:

[0065] A composite titanium oxide-supported noble metal catalyst for hydrogen peroxide synthesis is applied to a reaction system that catalyzes the direct synthesis of hydrogen peroxide from hydrogen and oxygen.

[0066] Above-mentioned, reaction system comprises: ethanol, concentrated sulfuric acid, described catalyst are mixed, under certain temperature, pressure, in H 2 , O 2 and N 2 reaction in a mixed atmosphere. Specifically, 60ml of ethanol, 0.38ml of concentrated sulfuric acid, 50mg of catalyst, and a reaction time of 5-120min.

[0067] Specifically, the gas pressure during the reaction is 101.325kPa, the gas composition ratio is H2:O2:N2=9:15:36 (mL / min), the stirring rate is 950rpm, the reaction temperature is 10°C, and the reaction time is 1-2h.

[0068] Based on the composite titanium oxide-supported precious metal catalyst fo...

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Abstract

The invention discloses a composite titanium oxide supported noble metal catalyst for hydrogen peroxide synthesis, and a preparation method and an application method thereof. The catalyst adopts composite titanium oxide as a carrier, wherein the composite titanium oxide is formed by compounding a compound containing at least one element of phosphorus, sulfur, selenium, carbon and silicon on the surface of titanium oxide; at least one metal of palladium, gold, silver and platinum is loaded on the carrier. According to the invention, titanium oxide is used as a carrier, and a compound containingat least one element of phosphorus, sulfur, selenium, carbon and silicon is compounded on the surface of the titanium oxide, so that the interface behavior of the original titanium oxide is improved,and the yield of H2O2 is increased in the reaction of directly synthesizing hydrogen peroxide from oxyhydrogen.

Description

technical field [0001] The invention relates to the technical field of hydrogen peroxide synthesis, in particular to a composite titanium oxide-supported precious metal catalyst for hydrogen peroxide synthesis, a preparation method and an application method. Background technique [0002] h 2 o 2 It is considered to be one of the cleanest and greenest chemical raw materials, and is widely used in various important fields such as textiles, papermaking, cosmetics, food, pharmaceuticals, sewage treatment, aviation, and electronics. Currently, H 2 o 2 The preparation methods include: anthraquinone method and hydrogen-oxygen direct synthesis method. Among them, the anthraquinone method is H 2 o 2 The most important method of synthesis and the most industrial application, more than 95% of the world's H 2 o 2 Produced by this process. However, this method has the following significant disadvantages: high production cost; complex process flow, high energy consumption, and di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42B01J23/44B01J23/50B01J23/52C01B15/029
CPCB01J23/44B01J23/42B01J23/50B01J23/52C01B15/029
Inventor 刘畅严伟李翀孙伟伟
Owner 南京工业大学张家港产业学院
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