Method for preparing supported palladium catalyst used for benzene catalytic oxidation

A technology of catalytic oxidation and supported palladium, which is applied in the field of preparation of supported palladium catalysts, can solve the problems of platinum catalyst limitations, high platinum loading, and expensive platinum, and achieve good catalytic activity, convenient source, and simple preparation method Effect

Inactive Publication Date: 2018-07-27
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although platinum catalysts have been proven to be effective catalysts for formaldehyde oxidation at low temperatures, the loading of platinum is higher and the price is much more expensive than palladium
Although some studies have focused on reducing the platinum loading, the practical application of platinum catalysts has been greatly limited due to the high price of platinum.

Method used

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  • Method for preparing supported palladium catalyst used for benzene catalytic oxidation

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) 2.0g Ce(NO 3 ) 3 ·6H 2 O was dissolved in 50 mL of ethanol and stirred for 0.5 h;

[0034] (2) Add 1.0 g of SBA-15 and stir until the solvent is completely evaporated to obtain a white solid, which is roasted in a muffle furnace at 600°C for 6 hours;

[0035] (3) react the obtained product in 2mol / L NaOH solution at 75°C for 2h, centrifuge and dry to obtain the carrier CeO 2 ;

[0036] (4) Take 20 mL of 3.0 g / L Cinnamomum camphora extract, mix it with 135 μL of 75 mM palladium nitrate, stir at 90°C for 1 hour, and adjust the pH to 2;

[0037] (5) Add 0.2g of CeO to the solution 2 Carrier, stirred for 1h, filtered and washed, dried at 50°C for 12h to obtain figure 1 Loadings shown are 0.5% Pd / CeO 2 Catalyst, recorded as 0.5Pd / CeO 2 catalyst.

Embodiment 2

[0039] (1) 2.0g Ce(NO 3 ) 3 ·6H 2 O was dissolved in 50 mL of ethanol and stirred for 0.5 h;

[0040] (2) Add 1.0 g of SBA-15 and stir until the solvent is completely evaporated to obtain a white solid, which is roasted in a muffle furnace at 500°C for 6 hours;

[0041] (3) react the obtained product in 2mol / L NaOH solution at 75°C for 2h, centrifuge and dry to obtain the carrier CeO 2 ;

[0042] (4) Take 15 mL of 3.0 g / L Cinnamomum camphora extract, mix it with 270 μL of 75.1 mM palladium nitrate, stir at 90°C for 1 hour, and adjust the pH to 2;

[0043] (5) Add 0.2g of CeO to the solution 2 Carrier, stirred for 1h, filtered and washed, dried at 50°C for 12h to obtain Pd / CeO with a loading capacity of 1.0% 2 Catalyst, denoted as 1.0Pd / CeO 2 catalyst.

Embodiment 3

[0045] (1) 2.0g Ce(NO 3 ) 3 ·6H 2 O was dissolved in 50 mL of ethanol and stirred for 0.5 h;

[0046] (2) Add 1.0 g of SBA-15 and stir until the solvent is completely evaporated to obtain a white solid, which is roasted at 400°C for 4 hours in a muffle furnace;

[0047] (3) react the obtained product in 2mol / L NaOH solution at 75°C for 2h, centrifuge and dry to obtain the carrier CeO 2 ;

[0048] (4) Take 30 mL of 3.0 g / L Cinnamomum camphora extract, mix it with 540 μL of 75.1 mM palladium nitrate, stir at 90°C for 1 hour, and adjust the pH to 2;

[0049] (5) Add 0.2g of CeO to the solution 2 Carrier, stirred for 1h, filtered and washed, dried at 50°C for 12h to obtain Pd / CeO with a loading capacity of 2.0% 2 Catalyst, denoted as 2.0Pd / CeO 2 catalyst.

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Abstract

The invention discloses a method for preparing supported palladium catalyst used for benzene catalytic oxidation. The method comprises the following steps: 1) taking a silicon source SBA-15 as a hardtemplate, and adding cerium salt for a reaction to prepare a carrier CeO2; 2) taking a vegetable matter howood as a reducing agent, and reducing a palladium precursor as palladium nano particles to obtain a material containing the palladium nano particles; and 3) employing a sol supporting method for supporting the palladium nano particles on the above carrier CeO2 to obtain a Pd / CeO2 catalyst which is the supported palladium catalyst. The supporting amount of the supported palladium catalyst is controlled at 0.1-2.0%, by aiming at different concentrations of benzene in VOCs, the different precious metals load capacities can be prepared, and the application scope is wide.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to a preparation method of a supported palladium catalyst for catalytic oxidation of benzene. Background technique [0002] Typical volatile organic compounds (VOCs) such as benzene, toluene, and xylene in the atmosphere pose a serious threat to human health and the earth's environment, mainly in the following aspects: (1) Most VOCs have a pungent odor or odor , seriously reducing people's quality of life; (2) VOCs have complex components, have the characteristics of penetration, volatilization, and fat solubility, and are also toxic, irritating, and teratogenic and carcinogenic, especially benzene, toluene, xylene, and formaldehyde are the most harmful ; (3) Most VOCs will interact with NO in the atmosphere x Photochemical reactions occur to form secondary pollutants or intermediate products with strong chemical activity, thereby increasing the surface...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01J29/03B01D53/72B01D53/86
CPCB01J23/63B01D53/8668B01J29/0325
Inventor 黄加乐郭云龙孙月娟孙道华李清彪
Owner XIAMEN UNIV
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