Catalyst and preparation method thereof

A catalyst and auxiliary technology, which is applied in the field of hydrogen peroxide catalyst and its preparation, can solve the problems of poor catalytic reaction selectivity, small specific surface area and pore volume, and high preparation cost, and achieves the improvement of electron density, changes in adsorption characteristics, and weakens interactions. Effect

Active Publication Date: 2019-10-08
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nickel-based catalysts have high catalytic activity and low price, but the selectivity of catalytic reactions is poor and there are many by-products; palladium catalysts have high catalytic activity and good selectivity, but the existing palladium catalysts still have small specific surface area and pore volume, low hydrogenation efficiency Low, high preparation costs and other defects

Method used

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  • Catalyst and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] Dilute 3mL of chloropalladium acid solution with a palladium concentration of 0.01g / mL to 13mL, impregnate 10g of activated alumina in equal volume, dry at 80°C for 2h, and roast at 550°C for 4h to obtain a catalyst with a Pd loading of 0.3% (c-0.3 %Pd).

[0093] The pore structure was tested with a BET analyzer, and the analysis results are shown in Table 1.

[0094] Catalyst dispersion, Pd particle size, hydrogenation efficiency and selectivity are shown in Table 2.

Embodiment 2

[0096] Using 13.3g La(NO 3 ) 3 .6H 2 10g of activated alumina was impregnated with an equal volume of a solution with an O concentration of 10% by weight, dried at 80°C for 2h, and calcined at 550°C for 4h to obtain La 2 o 3 La with a mass fraction of 5% 2 o 3 / Al 2 o 3 ball.

[0097] Dilute 3 mL of chloropalladium acid solution with a palladium concentration of 0.01 g / mL to 13 mL, and impregnate the above La 2 o 3 / Al 2 o 3 Balls were dried at 80°C for 2h and calcined at 550°C for 4h to obtain a catalyst with a Pd loading of 0.3% (c-5%La 2 o 3 -0.3% Pd).

[0098] The pore structure was tested with a BET analyzer, and the analysis results are shown in Table 1.

[0099] Catalyst dispersion, Pd particle size, hydrogenation efficiency and selectivity are shown in Table 2.

Embodiment 3

[0101] Dilute 3 mL of chloropalladium acid solution with a palladium concentration of 0.01 g / mL to 30 mL, add 10 g of functionalized titania-modified alumina support, then add 4 mL of 0.05 g / mL ascorbic acid, and stir the above mixture magnetically at 80 °C 2h, a catalyst with a Pd loading of 0.3% (f-TiO 2 / 0.3% Pd).

[0102] The pore structure was tested with a BET analyzer, and the analysis results are shown in Table 1.

[0103] Catalyst dispersion, Pd particle size, hydrogenation efficiency and selectivity are shown in Table 2.

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Abstract

The invention provides a catalyst, a preparation method thereof and application thereof in preparing hydrogen peroxide. Titanium dioxide modified alumina is taken as a carrier of the catalyst, nano titanium dioxide coats the surface of alumina, lanthanum oxide is loaded on a titanium dioxide layer, and palladium nanoparticles are distributed on the surface of a lanthanum oxide layer, wherein loading amount of palladium is 0.1-1.0wt%, lanthanum oxide content is 1-10wt%, and titanium dioxide content is 2-5wt%. The catalyst has larger specific surface area and greater pore volume and pore size. The preparation method is mild in reaction process, safe, efficient and environment-friendly. The catalyst has higher hydrogenation efficiency and selectivity in reaction of actual catalytic preparation of hydrogen peroxide, so that hydrogen peroxide production efficiency and yield can be improved substantially.

Description

technical field [0001] The invention relates to the field of catalyst preparation and application, in particular to a hydrogen peroxide catalyst and a preparation method thereof. Background technique [0002] h 2 o 2 As a green and environmentally friendly chemical reagent, it has been widely used in industry, agriculture, organic synthesis, electronic materials, pollutant degradation and catalytic oxidation desulfurization. [0003] in the production of H 2 o 2 Among the processes, the catalytic hydrogenation of anthraquinone is currently the most common and effective method. In this process, the core reaction is catalytic hydrogenation reaction. In order to improve the reaction efficiency, a lot of research work has been carried out at home and abroad, and hydrogenation catalyst is the most important thing in this research. [0004] Hydrogenation catalysts developed from nickel-based catalysts to Al 2 o 3 Support noble metal palladium (Pd) catalyst. Nickel-based ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01J35/10B01J37/16C01B15/01
CPCB01J23/63B01J23/002B01J35/1038B01J35/1061B01J35/1019B01J37/16C01B15/01B01J2523/00B01J2523/31B01J2523/3706B01J2523/47
Inventor 李义涛胡聿明钟颖贤黄永锋余航张宏清唐火强
Owner DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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