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Method for preparing composite perovskite oxide loaded palladium catalyst

A composite oxide and palladium catalyst technology, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc.

Inactive Publication Date: 2005-08-17
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Method for preparing composite perovskite oxide loaded palladium catalyst
  • Method for preparing composite perovskite oxide loaded palladium catalyst
  • Method for preparing composite perovskite oxide loaded palladium catalyst

Examples

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Embodiment 1

[0022] Example 1: The raw material is La(NO 3 ) 3 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O and PdCl 2 , The soluble salt concentration prepared is 0.2mol / L, according to LaCo 0.95 Pd 0.05 O 3 Mix various salt solutions in proportions. Take citric acid as the complexing agent, the concentration is 0.2mol / L, take 400ml of the complexing agent, add 800ml of soluble salt solution dropwise under strong stirring at 70℃, stir the sol until gelation; dry at 120℃, then 850 Calcination at ℃ for 5 hours; reduction treatment of the obtained perovskite oxide with hydrogen at 200 ℃ for 2 hours to prepare a catalyst.

Embodiment 2

[0023] Example 2. The preparation of the perovskite oxide was the same as that of Example 1. The obtained perovskite oxide was subjected to reduction treatment with hydrogen at 300° C. for 2 hours to obtain a catalyst.

Embodiment 3

[0024] Example 3. The preparation of the perovskite oxide was the same as that of Example 1. The obtained perovskite oxide was reduced with hydrogen at 400° C. for 2 hours to prepare a catalyst.

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Abstract

The preparation process of composite perovskite oxide loaded palladium catalyst includes the main steps of: compounding soluble metal salt solution with soluble salt of La, Co and Pd as material; dropping metal salt solution into citric acid as complexing agent to form sol; heating sol at 50-95 deg.c while stirring to obtain gel; drying at 110-160 deg.c for 10-24 hr and roasting at 600-1000 deg.c for 3-24 hr; and reduction processing of the obtained perovskite oxide. The catalyst is determined via X-ray powder diffraction process, hydrogen adsorption process and programmed heating-up desorption process to obtain its crystal phase, surface Pd density and oxygen adsorbing performance. The prepared catalyst is perovskite oxide loaded palladium catalyst with oxygen fault, and this structure has synergist effect of perovskite and Pd and excellent catalytic activity.

Description

Technical field [0001] The invention relates to a preparation method of a catalyst, in particular to the preparation of perovskite composite oxide (ABO) by solid phase crystallization (SPC) 3 ) Method of supporting palladium (Pd) catalyst. Background technique [0002] Traditional supported noble metal catalysts are generally prepared by the impregnation method. The catalyst prepared by this method has poor dispersion of noble metals and low high-temperature sintering resistance. Perovskite composite oxide (ABO 3 ) Has abundant physical and chemical properties: A and B metal ions can be partially replaced by different metal ions; its lattice oxygen content can be changed near the stoichiometric number to cause a certain concentration of oxygen vacancies; thermal stability is high; of which oxygen Defects play an important role in catalytic activity. As reported in patents CN1079175, CN1091056, and CN1104127, such compounds are widely used as catalytic materials. To improve ABO 3 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/86B01D53/94B01J23/89B01J37/03
Inventor 周克斌陈宏德田群沈迪新徐晓白
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI