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Palladium-based catalyst for methane catalytic combustion and preparation of palladium-based catalyst

A methane catalytic combustion and catalyst technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problems of poor low temperature activity and high ignition temperature

Inactive Publication Date: 2013-07-17
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst shows good catalytic performance, but the low-temperature activity is still not good, the final combustion temperature of complete conversion of methane is 570 ° C, and the light-off temperature is also relatively high

Method used

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  • Palladium-based catalyst for methane catalytic combustion and preparation of palladium-based catalyst

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specific Embodiment 1

[0016] Specific embodiment 1: Take by weighing 10 g of pseudo-boehmite, industrial grade, with a water loss rate of 15%, dissolve it in 150 mL of deionized water, add dilute nitric acid dropwise after stirring for 30 min, and adjust the pH value of the system to be 3 . Add 5 g of sodium dodecyl sulfate (SDS) to the above system, stir for 180 min, and put the sample into an electric drying oven at 100 °C for drying. After 10 h, the dried samples were transferred to a muffle furnace at a rate of 5 °C / min to 600 °C, and then roasted at a constant temperature for 4 h. Calcined for 4 h to obtain mesoporous alumina. It was then added to 0.605 mL of Pd(NO 3 ) 2 solution (with a noble metal content of 78 g / L), equal volumes were impregnated onto the mesoporous alumina support, and the impregnated sample was dried overnight at 110 °C, and then calcined in a muffle furnace at 600 °C for 2 h to obtain a supported palladium catalyst. Weighed 1g of catalyst and loaded it into a 5 mm qu...

specific Embodiment 2

[0017] Specific Example 2: Weigh 10 g of pseudo-boehmite, industrial grade, with a water loss rate of 15%, dissolve it in 150 mL of deionized water, stir for 30 min and add dilute nitric acid dropwise to adjust the pH of the system to 3. At this time, the pseudo-boehmite is in a sol state, and ammonia water is added to reverse the pH value of the system to 10. 5 g of cetyltrimethylammonium bromide (CTAB) was added to the above system, stirred for 180 min, and then dried in an electric oven at 100 °C. After 10 h, the dried samples were placed in a muffle furnace and calcined for 4 h to obtain the synthesized samples. It was then added to 0.605 mL of Pd(NO 3 ) 2 solution (with a noble metal content of 78 g / L), equal volumes were impregnated onto the mesoporous alumina support, and the impregnated sample was dried overnight at 110 °C, and then calcined in a muffle furnace at 600 °C for 2 h to obtain a supported palladium catalyst. Weigh 1g of catalyst and fill it into a 5 mm q...

specific Embodiment 3

[0018] Specific embodiment 3: Take by weighing 10 g of pseudo-boehmite, industrial grade, with a water loss rate of 15%, dissolve it in 150 mL of deionized water, add dilute nitric acid dropwise after stirring for 30 min, and adjust the pH value of the system to be 3 . Add 5 g of polyethylene glycol (industrial grade, PEG2000) to the above system, stir for 180 min, and put the sample into an electric drying oven at 100 °C for drying. After 10 h, the dried samples were transferred to a muffle furnace at a rate of 5 °C / min to 600 °C, and then roasted at a constant temperature for 4 h. Calcined for 4 h to obtain mesoporous alumina. It was then added to 0.605 mL of Pd(NO 3 ) 2 solution (with a noble metal content of 78 g / L), equal volumes were impregnated onto the mesoporous alumina support, and the impregnated sample was dried overnight at 110 °C, and then calcined in a muffle furnace at 600 °C for 2 h to obtain a supported palladium catalyst. Weigh 1g of catalyst and fill it...

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Abstract

The invention discloses a palladium-based catalyst for methane catalytic combustion. An active component is precious metal palladium, and a carrier is mesoporous alumina prepared by using pseudo-boehmite as an aluminum source, wherein the mesoporous alumina is synthesized by calcining industrial raw material pseudo-boehmite serving as an aluminum source in the presence of surfactant, and the palladium-based catalyst is prepared by adopting equivalent-volume impregnation; the specific surface are of mesoporous alumina is 200-400m<2> / g, the pore volume is 0.2-0.8cm<3> / g, and the aperture is 3-10nm; and the content of the active component palladium is 0.1-1% of the total weight of the catalyst. The raw material adopted by the catalyst is industrial raw material, the preparation cost is low, the preparation process is simple, the mesoporous alumina prepared by using pseudo-boehmite as an aluminum source has large pore volume and large specific surface area, the prepared palladium-based catalyst which serves as a carrier is good in catalytic effect on the methane combustion reaction and has low-temperature high-activity, high-temperature resistance, sintering resistance.

Description

technical field [0001] The invention relates to a methane catalytic combustion palladium-based catalyst and its preparation, which belongs to the field of catalyst preparation and its application. Specifically, it is a kind of mesoporous alumina prepared by modifying industrial raw material pseudoboehmite as a carrier, precious metal Palladium as an active metal catalyst for the catalytic combustion reaction of methane. Background technique [0002] Methane is the most stable hydrocarbon, it is usually difficult to activate or oxidize, and the working temperature of methane catalytic combustion is relatively high, a large amount of water vapor will be generated during the combustion reaction, and methane gas contains a small amount of sulfur, so methane catalytic combustion catalyst must have Due to its high activity, high hydrothermal stability and certain resistance to sulfur poisoning, the development of high-efficiency, stable and high-temperature sintering-resistant m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44
Inventor 卞龙春赵云昆王继亮
Owner YUNNAN UNIV
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