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Preparation method of perovskite oxide modified activated carbon supported noble metal catalyst

A noble metal catalyst and perovskite-type technology, which is applied in the field of preparation of perovskite-type oxide-modified activated carbon-supported noble metal catalysts, can solve the problems of low catalytic performance and single structure of perovskite-type oxides, and achieve selectivity High, avoid catalyst performance instability, enhance the effect of selectivity

Active Publication Date: 2022-03-29
XIAN CATALYST NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this method, activated carbon is modified by perovskite-type oxides, and perovskite-type oxides with special catalytic effects are introduced into the activated carbon structure, and the surface structure of activated carbon is modified during the formation of perovskite-type oxides. It also plays a structural guiding role in the formation of perovskite-type oxides. The two interact and influence each other, overcoming the influence of impurities in activated carbon itself on the catalyst, and the disadvantages of single structure and low catalytic performance of perovskite-type oxides; On the modified activated carbon, according to its structural characteristics, adopt the deposition precipitation method to load precious metals, and use formaldehyde to reduce, which ensures the complete reduction of active metal components and the generation of "eggshell" distribution and small size in the pores of activated carbon. Precious metal particles, the prepared precious metal catalyst has high reactivity, high selectivity and good stability, and the metal is not easy to lose during use

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  • Preparation method of perovskite oxide modified activated carbon supported noble metal catalyst
  • Preparation method of perovskite oxide modified activated carbon supported noble metal catalyst

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Embodiment 1

[0027] The noble metal in the perovskite oxide modified activated carbon supported noble metal catalyst of the present embodiment is palladium, and the loaded amount of the noble metal is 1wt%, and the preparation method of the catalyst is:

[0028] Step 1, weigh 0.31g La(NO 3 ) 3 ·6H 2 O and 0.29g Fe(NO 3 ) 3 9H 2 O was dissolved in deionized water to obtain a mixed solution; the specific surface area of ​​20g was 800m 2 / g of powdered activated carbon is added to the mixed solution and stirred evenly, stirred at 50°C for 12h, then put into an oven at 110°C for 12h, and finally roasted in a mixed atmosphere of nitrogen and oxygen at 600°C for 5h, the mixed atmosphere The volume percentage of oxygen in the medium is 10%, and the perovskite-type oxide-modified activated carbon is obtained;

[0029] Step 2. Add 9.90 g of the perovskite-type oxide-modified activated carbon described in step 1 into 100 g of 2% sodium hydroxide aqueous solution, stir well, and soak for 2 hour...

Embodiment 2

[0034] The noble metal in the perovskite oxide modified activated carbon supported noble metal catalyst of the present embodiment is palladium, and the loaded amount of the noble metal is 2.5wt%, and the preparation method of the catalyst is:

[0035] Step 1. Weigh 0.64g LaCl 3 ·6H 2 O and 0.72g Cr(NO 3 ) 3 9H 2 O was dissolved in deionized water to obtain a mixed solution; the specific surface area of ​​20g was 1000m 2 / g of powdered activated carbon is added to the mixed solution and stirred evenly, stirred at 90°C for 8h, then put into an oven at 100°C for 14h, and finally roasted at 700°C in a mixed atmosphere of nitrogen and oxygen for 7h, the mixed atmosphere The volume percentage of oxygen in the medium is 10%, and the perovskite-type oxide-modified activated carbon is obtained;

[0036] Step 2. Add 9.75 g of the perovskite-type oxide-modified activated carbon described in step 1 into 100 g of potassium hydroxide aqueous solution with a mass concentration of 4%, fu...

Embodiment 3

[0041] The noble metal in the perovskite oxide modified activated carbon supported noble metal catalyst of the present embodiment is palladium, and the loading amount of the noble metal is 5wt%, and the preparation method of the catalyst is:

[0042] Step 1, weigh 0.47g La(NO 3 ) 3 ·6H 2 O and 0.31g Ni(NO 3 ) 2 ·6H 2 O was dissolved in deionized water to obtain a mixed solution; the specific surface area of ​​20g was 1500m 2 / g of powdered activated carbon is added to the mixed solution and stirred evenly, stirred at 90°C for 10h, then put into an oven at 120°C for 10h, and finally roasted in a mixed atmosphere of nitrogen and oxygen at 700°C for 8h, the mixed atmosphere The volume percentage of oxygen in the medium is 10%, and the perovskite-type oxide-modified activated carbon is obtained;

[0043] Step 2: Add 9.50 g of the perovskite-type oxide-modified activated carbon described in step 1 into 120 g of potassium hydroxide aqueous solution with a mass concentration of...

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Abstract

The invention discloses a method for preparing a perovskite-type oxide-modified activated carbon-loaded noble metal catalyst. The noble metal is platinum or palladium, and the loading amount of the noble metal is 1wt% to 5wt%. The preparation method comprises: 1. Preparation of perovskite Mineral oxide-modified activated carbon; 2. Add perovskite-type oxide-modified activated carbon into the alkaline solution and stir evenly, and then impregnate to obtain activated carbon slurry; 3. Dissolve precious metal compounds in dilute hydrochloric acid to obtain active component solution 4. Add the active component solution to the activated carbon slurry, stir evenly, keep warm and impregnate to obtain the activated carbon slurry containing precious metals; 5. Add the reducing agent and lye to the activated carbon slurry containing precious metals, filter after reduction, and obtain filter cake , washing the filter cake to obtain a perovskite-type oxide-modified activated carbon-supported noble metal catalyst. The noble metal catalyst prepared by the invention has high reaction activity, high selectivity and good stability, and the metal is not easy to be lost during use.

Description

technical field [0001] The invention belongs to the technical field of preparation of noble metal catalysts, and in particular relates to a preparation method of a perovskite-type oxide-modified activated carbon-supported noble metal catalyst. Background technique [0002] As a catalyst support for noble metals, activated carbon has the advantages of high specific surface area, rich pore structure, acid and alkali resistance, and easy recovery of precious metals. Precious metal catalysts prepared with activated carbon as a carrier have been widely used in the preparation and production of fine chemicals. Different types of activated carbon have different surface physical and chemical properties, resulting in large differences in the performance of the prepared catalysts. Therefore, the research on the influence of the modification of activated carbon support on the performance of noble metal catalysts has become a research hotspot in the field of noble metal catalyst prepar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/89B01J23/652
CPCB01J23/894B01J23/6522
Inventor 闫江梅张鹏李岳锋王慧唐良李凡万克柔曾永康
Owner XIAN CATALYST NEW MATERIALS CO LTD
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