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: 2004-09-29
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • 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

[0011] Embodiment 1: raw material is La (NO 3 ) 3 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O and PdCl 2 , the prepared soluble salt concentration is 0.2mol / L, according to LaCo 0.95 PD 0.05 o 3 Take various salt solutions and mix them in proportion. Using citric acid as complexing agent, the concentration is 0.2mol / L, take 400ml of complexing agent, under strong stirring at 70°C, add 800ml of soluble salt solution dropwise, stir the sol until gelation; dry at 120°C, then 850 ℃ calcination for 5 hours; the obtained perovskite oxide was subjected to reduction treatment with hydrogen at 200 ℃ for 2 hours to obtain a catalyst.

Embodiment 2

[0012] Example 2. The preparation of the perovskite oxide was the same as in 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

[0013] Example 3, the preparation of the perovskite oxide was the same as in Example 1; the obtained perovskite oxide was subjected to reduction treatment with hydrogen gas at 400° C. for 2 hours to obtain 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 present invention relates to a kind of preparation method of catalyst, relate to utilizing solid phase crystallization method (spc) to prepare perovskite composite oxide (ABO) in particular 3 ) method of supporting palladium (Pd) catalyst. Background technique [0002] Traditional supported noble metal catalysts are generally prepared by impregnation method, which has poor dispersion of noble metals and low high temperature sintering resistance. Perovskite composite oxide (ABO 3 ) has rich physical and chemical properties: metal ions at A and B sites can be partially replaced by dissimilar metal ions; the oxygen content of its lattice can be changed near the stoichiometric number to cause a certain concentration of oxygen vacancies; thermal stability is high; among them, oxygen Defects play an important role in catalytic activity. As reported in patents CN1079175, CN1091056, and CN1104127, these compounds are widely used as catalytic materials. ...

Claims

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Application Information

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Patent Type & Authority Applications(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
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