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Perovskite/metal composite oxide catalyst and preparation method thereof

A metal composite and catalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as insufficient performance and catalytic performance changes, and achieve improved catalytic performance The effect of responsiveness

Active Publication Date: 2013-07-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the performance of conventional perovskite catalysts is still somewhat insufficient compared with noble metal catalysts, and in ABO 3 It is difficult to change the catalytic performance qualitatively by changing and doping the elements of the A or B site on the original basis.

Method used

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  • Perovskite/metal composite oxide catalyst and preparation method thereof
  • Perovskite/metal composite oxide catalyst and preparation method thereof
  • Perovskite/metal composite oxide catalyst and preparation method thereof

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preparation example Construction

[0012] The preparation method of catalyst provided by the invention comprises the steps:

[0013] (1) According to the molar ratio of metal elements in the general formula expression, the soluble salts of elements A and B are made into a solution with a total metal ion concentration of 0.1 to 1.0 mol / L, and the total molar number of A and B metals is 0.5 to 0.7 times Add an organic complexing agent to the solution, mix well, and heat to 50-80°C to form a wet gel.

[0014] (2) Raise the temperature of the wet gel to 100-150°C, heat the wet gel to gradually dry until it spontaneously ignites, grind the obtained ashes into powder, perform the first roasting at 300-500°C, and then bake at 700-900°C second roasting,

[0015] The step (1) of the above method is to prepare a wet gel. First, the soluble salts of elements A and B are formulated into a solution. The total metal ion concentration in the solution is preferably 0.1-0.8mol / L, and then an organic complexing agent is added t...

example 1

[0021] The composite oxides described in the present invention are prepared.

[0022] La(NO 3 ) 3 ·6H 2 O, Ni(NO 3 ) 2 ·6H 2 O was dissolved in water at a molar ratio of 1.15:1 to form a mixed solution with a total metal ion concentration of 0.5 mol / L, and citric acid was added in an amount 0.6 times the total number of moles of metal ions, and stirred for 4 hours to dissolve. Heat the mixed solution to 70°C and stir until it becomes a wet gel, raise the temperature to 110°C, heat to make the gel gradually dry until it spontaneously ignites, grind the obtained ash into powder, bake at 400°C for 2 hours, press into tablets, and then heat at 800°C Roasting for 4 hours, the general formula is LaNiO 3 0.075La 2 o 3 The composite oxide of is catalyst A, and its XRD spectrum is shown in figure 1 curve (1). It can be seen from curve (1) that catalyst A mainly has LaNiO 3 Characteristic peaks of perovskite crystals with a small amount of La 2 o 3 The characteristic peak (...

example 2

[0024] Set Y(NO 3 ) 3 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O was dissolved in water at a molar ratio of 1.2:1 to form a mixed solution with a total metal ion concentration of 0.5 mol / L, and citric acid was added in an amount 0.6 times the total number of moles of metal ions, and stirred for 4 hours to dissolve. Heat the mixed solution to 70°C and stir until it becomes a wet gel, raise the temperature to 110°C, heat to make the gel gradually dry until spontaneous combustion, grind the obtained ash into powder, bake at 400°C for 2 hours, press into tablets, and then bake at 800°C 4 hours, the general formula is YCoO 3 0.1Y 2 o 3 The compound oxide of is catalyst B, and its XRD spectrum is shown in figure 1 Curve (2). It can be seen from curve (2) that catalyst B mainly has YCoO 3 Characteristic peaks of perovskite crystals with a small amount of Y 2 o 3 The characteristic peaks indicate the formation of composites of perovskite and metal oxides.

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Abstract

The invention relates to a perovskite / metal composite oxide catalyst, the general expression of which is ABO3.nAOy or ABO3.nBOz, wherein A is selected from alkaline earth metals or rare earth metals, B is selected from ferrous metals, Cu, Sr or Mn, n is in the range of 0.05-0.4, and y and z are oxygen atom numbers matching the valence states of element A and B. The catalyst can all achieve good reaction performance when it is used in flue gas desulfurization, internal combustion engine tail gas purification, CO combustion-supporting agents and light degradation and other fields.

Description

technical field [0001] The invention relates to a metal composite oxide and a preparation method thereof, in particular to a composite oxide catalyst containing a perovskite type oxide and a preparation method thereof. Background technique [0002] With the development of the coal-fired industry and the increase in the number of motor vehicles, the emitted nitrogen oxides (NO accounts for more than 90%), sulfur oxides (SO x ), carbon monoxide (CO) and hydrocarbons (HC) are becoming increasingly serious. These four types of gases not only pollute the environment, affect the normal life of human beings, but also directly endanger human health. Therefore, developing a catalyst that can effectively eliminate the above-mentioned harmful gases has become a research hotspot. At present, the three-way catalysts that have been used basically use noble metals as active components. Although the catalytic performance is good, noble metals are expensive and difficult to popularize. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01J23/34
Inventor 于宁马爱增张翊陈志祥
Owner CHINA PETROLEUM & CHEM CORP
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