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Phosphorus-doped alumina-loaded palladium catalyst and preparation method thereof

An alumina-supported, palladium catalyst technology, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as low combustion activity, achieve less time-consuming, excellent performance, and mild reaction conditions Effect

Pending Publication Date: 2020-07-24
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For current Pd / P-Al 2 o 3 For the problem that the catalytic combustion activity of the catalyst is not high for methane, the invention provides a phosphorus-doped alumina-supported palladium catalyst and a preparation method thereof

Method used

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  • Phosphorus-doped alumina-loaded palladium catalyst and preparation method thereof
  • Phosphorus-doped alumina-loaded palladium catalyst and preparation method thereof
  • Phosphorus-doped alumina-loaded palladium catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 20mL absolute ethanol to 1gP123, stir and dissolve, then add 3mLH 2 O, 2.04g of ammonia water, 0.0084g of ammonium hypophosphite and mix well; dissolve 3.75g of aluminum nitrate nonahydrate in 10mL of absolute ethanol and add dropwise to the above mixed solution; after stirring at room temperature for 3h, place it in a constant temperature water bath at 80°C and stir for 0.5h , placed in an oven at 80°C for 12 hours, placed in a muffle furnace, heated at a rate of 2°C / min to 500°C for 4 hours, and then heated at a rate of 5°C / min to 900°C for 4 hours to obtain the target carrier, 1mol% P-Al 2 o 3 -900;

[0024] 1g 1mol% P-Al 2 o 3 Add 0.64mL dichlorotetraammine palladium solution (7.84mg / mL) to the -900 carrier to make an impregnation solution with pH = 12, immerse at 20-30°C for 12h, put it in an oven at 110°C for 12h, and then Put it in a muffle furnace, raise the temperature at a rate of 5°C / min to 500°C and roast for 4h to obtain 0.5wt%Pd / 1mol%P-Al 2 o 3 ...

Embodiment 2

[0027] Add 20mL absolute ethanol to 1gP123, stir and dissolve, then add 3mLH 2 O, 2.04g of ammonia water, 0.0256g of ammonium hypophosphite, and mix well; dissolve 3.75g of aluminum nitrate nonahydrate in 10mL of absolute ethanol and add dropwise to the above mixed solution; after stirring at room temperature for 3h, place it in a constant temperature water bath at 80°C and stir for 0.5h , placed in an oven at 80°C for 12 hours, placed in a muffle furnace, heated at a rate of 2°C / min to 500°C for 4 hours, and then heated at a rate of 5°C / min to 900°C for 4 hours to obtain the target carrier 3mol%P -Al 2 o 3 -900;

[0028] 1g 3mol% P-Al 2 o 3 Add 0.64mL dichlorotetraammine palladium solution (7.84mg / mL) to the -900 carrier to make an impregnation solution with pH = 12, immerse at 20-30°C for 12h, put it in an oven at 110°C for 12h, and then Put it in a muffle furnace, raise the temperature at a rate of 5°C / min to 500°C and roast for 4 hours to obtain 0.5wt%Pd / 3mol%P-Al 2 ...

Embodiment 3

[0031] Add 20mL absolute ethanol to 1gP123, stir and dissolve, then add 3mLH 2 O, 2.04g of ammonia water, 0.0426g of ammonium hypophosphite, and mix well; dissolve 3.75g of aluminum nitrate nonahydrate in 10mL of absolute ethanol and add dropwise to the above mixed solution; after stirring at room temperature for 3h, place it in a constant temperature water bath at 80°C and stir for 0.5h , placed in an oven at 80°C for 12 hours, placed in a muffle furnace, heated at a rate of 2°C / min to 500°C for 4 hours, and then heated at a rate of 5°C / min to 900°C for 4 hours to obtain the target carrier 5mol%P -Al 2 o 3 -900;

[0032] 1g 5mol% P-Al 2 o 3 Add 0.64mL dichlorotetraammine palladium solution (7.84mg / mL) to the -900 carrier to make an impregnation solution with pH = 12, immerse at 20-30°C for 12h, put it in an oven at 110°C for 12h, and then Put it in a muffle furnace, raise the temperature at a rate of 5°C / min to 500°C and roast for 4 hours to obtain 0.5wt%Pd / 5mol%P-Al 2 ...

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Abstract

The invention provides a phosphorus-doped alumina-loaded palladium catalyst and a preparation method thereof. The preparation method comprises the following steps: preparing a phosphorus-modified aluminum oxide carrier: dissolving P123 in absolute ethyl alcohol, sequentially adding water, ammonia water and a phosphorus precursor, uniformly mixing to obtain a mixed solution, dissolving an aluminumsource in absolute ethyl alcohol, adding the mixed solution, stirring, aging, drying and roasting to obtain phosphorus-modified aluminum oxide; and loading palladium metal: adding the phosphorus-modified alumina carrier into the impregnation liquid for isopyknic impregnation, drying and roasting to obtain the catalyst. According to the technical scheme, a one-step precipitation method is adopted in the preparation step of the phosphorus-modified aluminum oxide carrier so that the phosphorus element generates strong interaction with the aluminum oxide carrier in a high-dispersion form, the surface property of the aluminum oxide is effectively adjusted, and the palladium-based catalyst prepared by taking the aluminum oxide as the carrier through a charge-enhanced isovolumetric impregnation method is excellent in performance.

Description

technical field [0001] The invention relates to the field of catalyst material preparation, in particular to a phosphorus-doped alumina-supported palladium catalyst and a preparation method thereof. Background technique [0002] Natural gas (shale gas, combustible ice), as an emerging low-carbon energy, has increased global energy consumption by nearly 25% in the past decade, and has become one of the main sources of world energy consumption. As the main component of natural gas, the direct combustion temperature of methane is high (>1600°C), and CO, NO may be produced x and other harmful gases. In order to protect the environment and cope with global climate change, methane catalytic combustion, as a green technology, can effectively improve methane conversion efficiency and reduce CH 4 Harmful gas emissions during the utilization process have received widespread attention. [0003] At present, the catalysts for the catalytic combustion of methane are mainly palladium...

Claims

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Application Information

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IPC IPC(8): B01J27/185B01J37/08B01J37/02F23G7/07
CPCB01J27/1856B01J37/082B01J37/088B01J37/0201B01J37/0203B01J37/0213B01J37/0207F23G7/07
Inventor 黄飞洪碧绿雷美寰
Owner FUJIAN NORMAL UNIV
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