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Nickel cerium catalyst as well as preparation method and application thereof

A catalyst, nickel-cerium technology, applied in chemical instruments and methods, physical/chemical process catalysts, combustion methods, etc., can solve the problem of low combustion activity of methane, and achieve the effects of low cost, simple preparation steps, and cheap and easy-to-obtain raw materials

Inactive Publication Date: 2014-08-13
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Zarur et al. (Zarur, nature, 2000, 403:65-67) prepared CeO 2 - BHA catalyst with comparable activity to noble metals, methane light-off temperature (T 10 ) is about 400°C; Li Can et al. (Li Can, Appl.Catal.A: Gen., 2003,246,1) prepared nickel-cerium composite oxides by citric acid method, and they found that the ratio of nickel-cerium to 7:3 ( Ce 0.7 Ni 0.3 o 2 ), the catalyst has the best oxidation-reduction performance and methane combustion activity, but the methane combustion activity of the nickel-cerium catalyst is still not high (complete conversion of methane can only be achieved above 550°C)

Method used

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  • Nickel cerium catalyst as well as preparation method and application thereof
  • Nickel cerium catalyst as well as preparation method and application thereof
  • Nickel cerium catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) 3.474g Ce(NO 3 ) 3 ·6H 2 O and 50mL benzyl alcohol (both pure in AR) were added to a 150mL round-bottomed flask, placed in an oil bath, heated to reflux and stirred evenly; when the oil temperature rose to 120°C, open the round-bottomed flask for 10 minutes to remove water After continuing to reflux for 12h, the mixture was cooled to room temperature, centrifuged and washed with ethanol several times, dried at 90°C for 12h, and calcined at 450°C for 2h.

[0025] 2) Using the equal-volume impregnation method, the cerium oxide carrier was impregnated in the ethanol solution of nickel precursor salt compound according to the catalyst ratio (NiO loading was 1mol%) for 12h, then dried at 90°C for 12h, and calcined in air atmosphere at 450°C 2h, the nickel precursor salt compound is Ni(NO 3 ) 2 ·6H 2 O: Grind and press the calcined catalyst, and take 40-80 mesh after sieving, and the prepared catalyst is abbreviated as 1NiO / CeO 2 -S.

[0026] The activity evaluation...

Embodiment 2

[0028] 1) Same as step 1) in Example 1.

[0029] 2) Change the NiO loading in step 2) of Example 1 to 5mol%, and the rest of the steps are the same as in Example 1, and the resulting catalyst is abbreviated as 5NiO / CeO 2 -S. The activity evaluation results of the catalysts are shown in Table 1.

Embodiment 3

[0031] 1) Same as step 1) in Example 1.

[0032] 2) Change the NiO load in step 2) of Example 1 to 10mol%, and the rest of the steps are the same as in Example 1, and the resulting catalyst is abbreviated as 10NiO / CeO 2 -S. The activity evaluation results of the catalysts are shown in Table 1. Where methane ignition temperature T 10 is 337°C, the half-transformation temperature T 50 is 423°C, the complete conversion temperature T 90 It is 490°C.

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Abstract

The invention discloses a nickel cerium catalyst as well as a preparation method and application thereof, and relates to a methane combustion catalyst. The nickel cerium catalyst comprises nickel oxide and a carrier, wherein the mole percentage of the nickel oxide load quantity is 1%-15%; the carrier is cerium oxide, wherein the specific surface area of the nickel cerium catalyst is 123-179m<2> / g. The preparation method of the nickel cerium catalyst comprises the following steps: 1) mixing cerous nitrate and benzyl alcohol, then heating reflux, further refluxing after water removing treatment, cooling the mixture to room temperature, centrifuging, washing, drying, and roasting to obtain a cerium oxide carrier; 2) soaking the cerium oxide carrier obtained from the step 1) into a nickel precursor salt compound ethanol solution according to the proportion of the catalyst, drying at 90 DEG C, roasting, grinding, tabletting, and sieving to obtain the nickel cerium catalyst, and marking as xNiO / CeO2 (x=1, 5, 10, 15). The nickel cerium catalyst can be applied to methane catalytic low-temperature combustion reaction; raw materials are low in price, can be available easily, and are low in cost; the preparation steps are relatively simple, and the preparation condition is mild.

Description

technical field [0001] The invention relates to a methane combustion catalyst, in particular to a nickel-cerium catalyst with a large specific surface area, a preparation method and application thereof. Background technique [0002] my country is rich in natural gas reserves, and the main component of natural gas, methane, is one of the main gases of the greenhouse effect. On the one hand, the greenhouse effect caused by methane is 25 times higher than that of carbon dioxide in terms of the number of molecules; on the other hand, methane contains a higher The ratio of carbon to hydrogen has a large calorific value of combustion. As people pay more and more attention to the environment and energy shortage, the research on the catalytic combustion of methane has also attracted people's attention. The traditional methane combustion method not only has a high combustion temperature (1600°C), but also produces a large amount of NO x , and the incomplete combustion of methane lea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83F23G7/07
Inventor 董玲玉夏文生
Owner XIAMEN UNIV
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