Chemical corrosion preparation method of porous CeO2 loaded perovskite composite catalytic material

A catalytic material and chemical corrosion technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, heterogeneous catalyst chemical elements, etc., can solve problems such as weak binding force, catalyst cannot be heat-treated at high temperature, complex and time-consuming process, etc., to achieve The effect of guaranteeing the service life

Active Publication Date: 2021-01-22
SHIJIAZHUANG TIEDAO UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0006] However, the above-mentioned preparation process is a multi-step synthesis, which has the following disadvantages: the process is complicated and time-consuming, and after multiple synthesis, cleaning and reaction processes, the perovskite is easy to lose, resulting in a large difference between the active phase and the theoretical value, which is not conducive to large-scale Application, secondary deposition or impregnation of active phase, some catalysts cannot be heat treated at high temperature, so that perovskite and CeO 2 The binding force between them is weak, and most of the above-mentioned catalysts are perovskite with stacked structure

Method used

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  • Chemical corrosion preparation method of porous CeO2 loaded perovskite composite catalytic material
  • Chemical corrosion preparation method of porous CeO2 loaded perovskite composite catalytic material
  • Chemical corrosion preparation method of porous CeO2 loaded perovskite composite catalytic material

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Embodiment 1

[0044] The catalytic material prepared in this embodiment is CeO 2 Loaded LaCoO 3 , and using ZnO as the preparation process of the sacrificial oxide, the specific preparation process is as follows:

[0045] (1) Configuration solution:

[0046] Configure Ce(NO) with a molar ratio of 2:0.1:0.1:2:4.8:2 respectively 3 、La(NO) 3 、Co(NO) 3 , Zn(NO) 2 、K 2 (CO) 3 and NaOH aqueous solution for subsequent use;

[0047] (2) Preparation of precursor:

[0048] The above Ce(NO) 3 、La(NO) 3 、Co(NO) 3 and Zn(NO) 2 Mix the solution evenly, and stir it magnetically until it is evenly mixed, then slowly add the configured K 2 (CO) 3 solution, when the initial precipitation occurs, add the configured NaOH aqueous solution, and after the precipitation is complete, filter the precipitate, wash it to neutrality, and dry it at a temperature of 60°C, and then keep it warm at 400°C for 3 hours, CeO was formed after incubation at 600°C for 9 hours 2 / LaCoO 3 / ZnO precursor;

[0049] ...

Embodiment 2

[0054] This embodiment is basically the same as Embodiment 1, the difference is:

[0055] The catalytic material prepared in this embodiment is CeO 2 Loaded LaCoO 3 , and with Al 2 o 3 As a preparation process for sacrificial oxides, the specific preparation process is as follows:

[0056] (1) Configuration solution:

[0057] Configure Ce(NO) with a molar ratio of 2:0.1:0.1:2:4.8:2 respectively 3 、La(NO) 3 、Co(NO) 3 , Al(NO) 3 、K 2 (CO) 3 and NaOH aqueous solution for subsequent use;

[0058] (2) Preparation of precursor:

[0059] The above Ce(NO) 3 、La(NO) 3 、Co(NO) 3 and Al(NO) 3 Mix the solution evenly, and stir it magnetically until it is evenly mixed, then slowly add the configured K 2 (CO) 3 solution, when the initial precipitation occurs, add the configured NaOH aqueous solution, and after the precipitation is complete, filter the precipitate, wash it to neutrality, and dry it at a temperature of 60°C, and then keep it warm at 400°C for 3 hours, CeO wa...

Embodiment 3

[0065] This embodiment is basically the same as Embodiment 1, the difference is:

[0066] The catalytic material prepared in this embodiment is CeO 2 Loaded LaMnO 3 , and with Al 2 o 3 As a preparation process for sacrificial oxides, the specific preparation process is as follows:

[0067] (1) Configuration solution:

[0068] Configure Ce(NO) with a molar ratio of 2:0.1:0.1:2:4.8:2 respectively 3 、La(NO) 3 , Mn(NO) 2 , Al(NO) 3 、K 2 (CO) 3 and NaOH aqueous solution for subsequent use;

[0069] (2) Preparation of precursor:

[0070] The above Ce(NO) 3 、La(NO) 3 , Mn(NO) 2 and Al(NO) 3 Mix the solution evenly, and stir it magnetically until it is evenly mixed, then slowly add the configured K 2 (CO) 3 solution, when the initial precipitation occurs, add the configured NaOH aqueous solution, and after the precipitation is complete, filter the precipitate, wash it to neutrality, and dry it at a temperature of 60°C, and then keep it warm at 400°C for 3 hours, CeO ...

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Abstract

The invention provides a chemical corrosion preparation method of a porous CeO2 loaded perovskite composite catalytic material. The chemical corrosion preparation method comprises the following steps:(1) preparing a solution; (2) preparing a precursor; (3) performing chemical corrosion; (4) performing calcining treatment. The method, being different from a traditional preparation method, has theadvantages that perovskite in-situ loading is realized while the porous CeO2 carrier is synthesized by utilizing a chemical corrosion method, multi-step deposition or impregnation is not needed, and the porous structure composite catalyst can be generated in situ only by calcining a one-step synthesized precursor, corroding off sacrificial oxide and performing proper heat treatment. A surface-loaded perovskite stacking structure is prepared into a supporting pore structure with a nano-pore channel, so that in-situ loading of perovskite is realized and a firmer interface is formed; therefore, harmful pollutants can be in more effective contact with a catalyst, and the effect of a porous structure, especially a perovskite active phase loaded on the porous structure, is brought into full play, so that the catalytic activity of the catalyst is improved. Besides, the agglomeration and growth of the active phase nano-particles in the heating or service process can be inhibited.

Description

technical field [0001] The invention belongs to the technical field of harmful gas catalysis, and in particular relates to a porous CeO 2 A chemical corrosion preparation method for loaded perovskite composite catalytic materials. Background technique [0002] Ceria (CeO 2 ) has been widely used in various fields such as three-phase catalysts for automobile exhaust treatment, coal smoke combustion catalysts, solid oxide fuel cells, and organic pollutants due to its excellent oxygen storage and release capabilities. Numerous studies have shown that the CeO 2 When matrix composite nanomaterials are used in heterogeneous catalytic reactions, the structure and composition have an important impact on their catalytic performance. Therefore, CeO 2 The synthetic preparation method has always been CeO 2 focus of catalyst research. [0003] In order to enhance catalytic activity, save cost, improve utilization and catalytic efficiency, CeO 2 prepared as a porous structure. Due...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01J35/10B01J37/03B01J37/10B01D53/94B01D53/86B01J19/02
CPCB01J23/83B01J23/002B01J35/10B01J37/031B01J37/10B01D53/945B01D53/86B01J19/02B01J2523/00B01D2258/01B01D2258/0283B01J2523/3706B01J2523/3712B01J2523/845Y02C20/30
Inventor 张小龙冯文杰李桂景田瑞兰
Owner SHIJIAZHUANG TIEDAO UNIV
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