Preparation method and application of palladium-supported catalyst for methanol catalytic combustion

A catalytic combustion and palladium-loaded technology, which is applied in the field of preparation of palladium-loaded catalysts, can solve the problems of high amount of precious metals, easy carbon deposition of catalysts, and poor stability, so as to improve catalytic activity and selectivity, excellent catalytic activity, and maintain catalytic activity. Effect

Active Publication Date: 2019-08-02
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the catalytic oxidation activity of the noble metal-supported catalyst prepared by the prior art is excellent, but there are the following disadvantages: (1) the amount of noble metal is relatively high, usually about 1%; (2) the catalyst is easily deactivated due to carbon deposition during application; ( 3) Precious metals are easy to agglomerate at high temperature and have poor stability

Method used

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  • Preparation method and application of palladium-supported catalyst for methanol catalytic combustion
  • Preparation method and application of palladium-supported catalyst for methanol catalytic combustion
  • Preparation method and application of palladium-supported catalyst for methanol catalytic combustion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1 is used for the preparation method of the palladium supported catalyst of methanol catalytic combustion

[0027] Specifically include the following steps:

[0028] (1) Pour palladium nitrate (the content of palladium is 0.05g), manganese nitrate (the content of manganese is 0.50g), aluminum oxide (9.45g) and 30mL deionized water are poured into the flask and mixed uniformly to obtain a mixed solution, which will be obtained The mixed solution is placed in a rotary evaporator, and the temperature is 80 ° C and the vacuum is 0.1 MPa, and the solvent is removed to obtain a solid;

[0029] (2) Mix the solid obtained in step (1) with sodium dihydrogen phosphate (the mass ratio of solid to sodium dihydrogen phosphate is 10:1), and then roast them sequentially (the roasting atmosphere is air, the temperature is 300°C, and the time is 1h;) and reduction (reducing atmosphere is 10% H 2 / Ar mixed gas, the temperature is 100°C, and the time is 0.5h. ), promptly obt...

Embodiment 2

[0030] Embodiment 2 is used for the preparation method of the palladium supported catalyst of methanol catalytic combustion

[0031] Specifically include the following steps:

[0032] (1) Pour palladium nitrate (the content of palladium is 0.10g), manganese nitrate (the content of manganese is 1.00g), aluminum oxide (8.90g) and 30mL deionized water are poured into the flask and mixed uniformly to obtain a mixed solution. The mixed solution is placed in a rotary evaporator, and the temperature is 80 ° C and the vacuum is 0.1 MPa, and the solvent is removed to obtain a solid;

[0033] (2) Mix the solid obtained in step (1) with sodium dihydrogen phosphate (the mass ratio of solid to sodium dihydrogen phosphate is 15:1), and then roast them sequentially (the roasting atmosphere is air, the temperature is 500°C, and the time is 3h;) and reduction (reducing atmosphere is 10% H 2 / Ar mixed gas, the temperature is 200°C, and the time is 1.5h. ), promptly obtain described palladium...

Embodiment 3

[0034] Embodiment 3 is used for the preparation method of the palladium supported catalyst of methanol catalytic combustion

[0035] Specifically include the following steps:

[0036] (1) Pour palladium nitrate (the content of palladium is 0.06g), manganese nitrate (the content of manganese is 0.70g), aluminum oxide (9.24g) and 30mL deionized water are poured into the flask and mixed uniformly to obtain a mixed solution, which will be obtained The mixed solution is placed in a rotary evaporator, and the temperature is 80 ° C and the vacuum is 0.1 MPa, and the solvent is removed to obtain a solid;

[0037] (2) Mix the solid obtained in step (1) with sodium dihydrogen phosphate (mass ratio of 12:1), and then perform roasting (the roasting atmosphere is air, the temperature is 400°C, and the time is 2h;) and reduction (reduction The atmosphere is 10% H 2 / Ar mixed gas, the temperature is 150°C, and the time is 1h. ), promptly obtain described palladium supported catalyst.

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Abstract

The invention provides a preparation method and application of a palladium-supported catalyst for methanol catalytic combustion. According to the preparation method, a solid obtained by impregnating palladium nitrate and manganese nitrate in alumina is uniformly mixed with sodium dihydrogen phosphate, and the mixture is calcined and then reduced to prepare the palladium-supported catalyst. The palladium-supported catalyst provided by the invention has the advantages that palladium and phosphorus doped manganese oxide can be highly dispersed on the surface of alumina by utilizing the high specific surface area characteristic of alumina, so that more surface active sites are constructed, and the palladium-supported catalyst exhibits excellent methanol catalytic combustion performance, and has relatively large potential in the application of precious metal catalysts.

Description

technical field [0001] The invention belongs to the field of environmental catalysis, and in particular relates to a preparation method and application of a palladium-loaded catalyst used for catalytic combustion of methanol. Background technique [0002] Methanol is one of the basic organic raw materials for chemical synthesis, and is usually used to manufacture various organic products such as methyl chloride, methylamine and dimethyl sulfate. It is also a raw material for the synthesis of pesticides and medicines. Among them, the main application field of methanol is the production of formaldehyde, which is used as an adhesive, used in wood processing, mold coating, textile and paper treatment, and is closely related to human life. [0003] However, it is unavoidable that low-concentration methanol is discharged into the environment during the production process, which brings ecological hazards. In order to improve air quality, strict emission requirements are required ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/187B01J35/10F23G7/07
CPCB01J27/187B01J35/0066B01J35/1004F23G7/07
Inventor 于伟袁方洋崔政伟俞建峰
Owner JIANGNAN UNIV
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