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Perovskite catalyst used for steam reforming of oxygenated ethanol and preparation method thereof

A technology for steam reforming and oxygenating ethanol, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc. problem, to achieve the effect of less carbon deposition and high activity

Inactive Publication Date: 2010-09-08
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the addition of oxygen will release additional heat, causing hot spots on the surface of the catalyst, accelerating the sintering of the catalyst, especially the active metal components such as Ni, Co, etc., leading to deactivation, so the addition of oxygen is unfavorable from this point of view

Method used

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  • Perovskite catalyst used for steam reforming of oxygenated ethanol and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Weigh 2.576g of La(NO 3 ) 3 .6H 2 O, 2.391g of Fe(NO 3 ) 3 .9H 2 O, 0.621g Ca(NO 3 ) 2 4H 2 O, 0.747g Ni(NO 3 ) 2 .6H 2 O, the citric acid of 5.63g, the polyethylene glycol 400 of 0.3g, join the deionized water of 150ml and be made into solution, stir 5 hours in the oil bath of temperature 50 ℃, stirring rate 120rpm, obtain uniform liquid at 90 Continue stirring in an oil bath at °C until a sol is obtained. It was then dried at 120° C. for 24 hours. The obtained solid was roasted in a roasting furnace. The roasting process was as follows: heating to 400° C. at a heating rate of 2° C. / min, roasting for 3 hours, and then heating to 750° C. at the same heating rate, and roasting for 6 hours. Get 3g of La 0.7 Ca 0.3 Fe 0.7 Ni 0.3 o 3 . The obtained solid is ground and sieved into 40-60 mesh particles.

[0015] Example 1 The catalyst prepared in the process of producing hydrogen-rich gas by oxygenated ethanol steam reforming: the performance test of the ca...

Embodiment 2

[0019] La 0.5 Ca 0.5 Fe 0.7 Ni 0.3 o 3 The preparation process is the same as in Example 1, except that the raw material consumption is different: the raw material consumption is respectively: 1.84g of La(NO 3 ) 3 .6H 2 O, 2.391g of Fe(NO 3 ) 3 .9H 2 O, 1.035g Ca(NO 3 ) 2 4H 2 O, 0.747g Ni(NO 3 ) 2 .6H 2 O, the citric acid of 5.63g, the polyethylene glycol 400 of 0.3g, mix and dissolve in deionized water and make solution, subsequent steps are with embodiment 1.

[0020] The prepared catalyst is used in the process of producing hydrogen-rich gas by oxygenated ethanol steam reforming: the molar ratio of ethanol to water is 1:3, and enter the reactor to start the reaction after being vaporized in the gasification chamber at 140°C. The gas composition is 80vol% nitrogen + oxygen, 20vol% ethanol + water, wherein the molar ratio of ethanol to water is 1:3, and the molar ratio of oxygen to ethanol is 0.5:1, at 120000h -1 The reaction was carried out at space velocity. ...

Embodiment 3

[0022] La 0.6 Ca 0.4 Fe 0.7 Ni 0.3 o 3 The preparation process is the same as in Example 1, except that the raw material consumption is different: the raw material consumption is respectively: 2.208g of La(NO 3 ) 3 .6H 2 O, 2.391g of Fe(NO 3 ) 3 .9H 2 O, 0.828g of Ca(NO 3 ) 2 4H 2 O, 0.747g Ni(NO 3 ) 2 .6H 2 O, the citric acid of 5.63g, 0.3g polyethylene glycol 400, mix and dissolve in deionized water and make solution, subsequent steps are with embodiment 1.

[0023] The prepared catalyst is used in the process of producing hydrogen-rich gas by oxygenated ethanol steam reforming: the molar ratio of ethanol to water is 1:3, and enter the reactor to start the reaction after being vaporized in the gasification chamber at 140°C. The gas composition is 80vol% nitrogen + oxygen, 20vol% ethanol + water, wherein the molar ratio of ethanol to water is 1:3, and the molar ratio of oxygen to ethanol is 0.5:1, at 120000h -1 The reaction was carried out at space velocity. ...

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Abstract

The invention discloses a perovskite catalyst used for the steam reforming of oxygenated ethanol and a preparation method thereof. The structural formula of the perovskite catalyst is La1-xCaxFe0.7Ni0.3O3 and x is 0-0.5. The preparation method comprises the following steps: using deionized water to prepare a solution containing metallic positive ions of La, Ca, Fe and Ni, citric acid and polyethylene glycol 400, stirring the solution at 70-95 DEG C to obtain sol; drying sol, performing first stage roasting and second stage roasting to obtain solid perovskite; and grinding and screening solid perovskite to obtain the perovskite catalyst La1-xCaxFe0.7Ni0.3O3. The invention has the advantages that the preparation method is convenient, the catalyst is used in the steam reforming of oxygenated ethanol, the catalyst activity is high, the carbon deposit amount is low, the anti-sintering performance is good, and the perovskite catalyst is a catalyst which has high activity and stability and is used for preparing hydrogen from ethanol.

Description

technical field [0001] The invention relates to a perovskite catalyst for steam reforming of oxygenated ethanol and a preparation method thereof, belonging to the supported metal catalyst technology for hydrocarbon reforming application. Background technique [0002] Ethanol steam reforming (SRE) catalysts mainly include: Co-based catalysts, Ni-based catalysts, and noble metal catalysts. Among them, Ni-based catalysts are favored by people because of their high reforming activity and relatively low price. However, catalysts with Ni as the active component also have some disadvantages when used in SRE. Since metal nickel itself is a good methanation catalyst, the methane selectivity is higher in the reforming process, thereby reducing the hydrogen content in the product. In addition, methane itself is prone to cracking reaction to form carbon deposition, which leads to catalyst deactivation. In addition, the carrier and the supported Ni particles, especially when they are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83C01B3/32
Inventor 刘源陈顺权
Owner TIANJIN UNIV
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