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Preparation method and applications of supported Ni/TiO2 catalyst

A catalyst and supported technology, which is applied in the field of supported nickel-based catalysts and their preparation, can solve the problems of cost and resources limiting the application of catalysts, and achieve the effects of good catalytic effect, high heat resistance and low price

Inactive Publication Date: 2020-03-31
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Currently many reports [1-3] It is proposed that catalysts are doped with noble metals or noble metals are used as supports for loading. High cost and scarcity of resources limit the application of catalysts in actual commercial industries.

Method used

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  • Preparation method and applications of supported Ni/TiO2 catalyst
  • Preparation method and applications of supported Ni/TiO2 catalyst
  • Preparation method and applications of supported Ni/TiO2 catalyst

Examples

Experimental program
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preparation example Construction

[0033] A supported Ni / TiO 2 The preparation method of catalyst is characterized in that described catalyst is made up of nickel, titanium dioxide, and its structural formula is Ni / TiO 2 . Preparation includes the following steps:

[0034] (1) Take different proportions of nickel source precursors in round bottom flasks.

[0035] (2) Add a certain amount of sodium borohydride into the round bottom flask, and reduce for 3-5 minutes.

[0036] (3) Add 0.025g / ml-0.125g / ml of TiO to the reduced suspension 2 , impregnated for 10min-60min to obtain a suspension catalyst.

[0037] (4) Centrifuge, wash and dry the catalyst suspension to obtain a black powder sample.

[0038] The nickel source precursor is nickel chloride hexahydrate, nickel nitrate hexahydrate or nickel sulfate heptahydrate;

[0039] The titanium dioxide is nanoparticles with a particle diameter of 25nm;

[0040] The ratio of the amount of the nickel source precursor substance to the amount of titanium dioxide is...

Embodiment 1

[0050] Ni / TiO 2Preparation of nanoparticles: Measure 0.1mmol of nickel chloride solution into a 100ml round-bottomed flask with a pipette gun and place the round-bottomed flask on a magnetic stirrer; under the condition of magnetic stirring, quickly add 0.03 The sodium borohydride solution of g / ml observes that a large amount of black precipitates and bubbles are produced (sodium borohydride solution is now used and ready-made); Treat that bubbles disappear completely, add the titanium dioxide of 0.05g / ml in the suspension in the round bottom flask, The reaction was immersed for 20min under magnetic stirring, transferred to a centrifuge tube, centrifuged and ultrasonically cleaned 3-4 times, and then freeze-dried for 24h to obtain the loaded Ni / TiO 2 Nanoparticles, spare. By changing the amount of titania support and the impregnation time, different loadings of Ni / TiO can be obtained 2 nanoparticles. The TEM transmission image of the optimal loading is as follows figure 1 ...

Embodiment 2

[0054] As described in Example 1, the difference is that the amount of titanium dioxide supported in the catalyst is fixed at 0.1 g, ie 0.05 g / ml. The soaking time is set to be 10min, 20min, 30min, 40min, 50min, 60min respectively, and the remaining operations are the same as in Example 1.

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Abstract

The invention discloses a preparation method and applications of a supported Ni / TiO2 catalyst. The preparation method comprises the following steps: under room temperature and normal pressure, preparing a solution A from a nickel source precursor, and preparing a solution B from a reducing agent; rapidly adding the solution B into a round-bottom flask containing the solution A, and magnetically stirring at room temperature and normal pressure to obtain a black suspension; adding a carrier titanium dioxide into the prepared black suspension; and after dipping, centrifuging, washing, and drying.According to the invention, the supported Ni / TiO2 catalyst is mainly applied to catalytic degradation of hydrazine hydrate; nickel is a transition element, and is reasonable in price and high in activity, titanium dioxide as a carrier can provide a large surface area and a proper pore structure so as to increase the dispersity of the active component nickel on the carrier, and the highly dispersed nickel-based catalyst can substantially reduce the sintering and aggregation phenomena of the active component and complete degradation within a short time; and the catalyst has good selectivity andis beneficial to catalytic degradation.

Description

technical field [0001] The invention belongs to the field of environmental catalysis, and in particular relates to a supported nickel-based catalyst and its preparation method and application. Background technique [0002] Hydrazine hydrate (N 2 h 4 ·H 2 O), also known as hydrazine hydrate, is a common organic substance in boilers, electroplating wastewater and rocket fuel waste. Improper treatment will produce carcinogenic toxic nitrosamines, which pose a great threat to the environment and human health. At present, the most popular way to treat hydrazine wastewater is to use nickel-based catalysts to catalytically degrade it to produce nitrogen and clean energy hydrogen that does not require secondary treatment. [0003] The supported nickel-based catalyst means that the active component nickel is supported on the carrier material. The performance of the catalyst is improved by taking advantage of the large surface area and high mechanical strength of the support mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755B01J37/16B01J37/02C01B3/04
CPCB01J23/755B01J37/16B01J37/0201C01B3/047B01J35/393B01J35/23Y02E60/36
Inventor 刘莹张欢苏彦铭
Owner TIANJIN POLYTECHNIC UNIV