Nano NiO-CeO-Al2O3 oxygen carrier catalyst for hydrogen production by reforming water vapor and preparation method of nano NiO-CeO-Al2O3 oxygen carrier catalyst

A steam reforming, oxygen carrier technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc. performance and other issues, to achieve the effect of small carbon deposition, low cost and good process carbon deposition

Inactive Publication Date: 2013-11-27
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Regarding the patent on oxygen carrier technology, ZL200710019975.9 developed a coal burning device based on calcium sulfate oxygen carrier to realize the coal combustion process based on circulating oxygen carrier and achieve the separation of carbon dioxide during the combustion process; patent 201110116857.6 disclosed A method for preparing a composite oxygen carrier using calcium sulfate as the main raw material for chemical looping combustion; patent 201010254741.4 discloses a method using CaSO 4 Or CuO as raw material and Ni(NO3) 2 9H 2 O particles mixed with oxygen carrier particles for chemical looping combustion; patent 201110374280.9 provides the use of three-dimensional ordered macroporous perovskite oxides as oxygen carriers for carbon-containing fuel chemical looping hydrogen production; most of the current oxygen carriers are Concentrated in the field of chemical looping combustion, it cannot be applied to the field of chemical looping reforming hydrogen production. The

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preparation example Construction

[0018] The above-mentioned nano-NiO-CeO / Al with redox performance for hydrogen production by steam reforming 2 o 3 The preparation method of oxygen carrier catalyst comprises the following steps:

[0019] a. Take analytically pure nickel oxide, dissolve it with dilute nitric acid with a molar concentration of 2-3ml / L, configure it into a nickel nitrate solution with a concentration of 20-50% by mass, and then add a mass fraction of 10-30% nickel oxide to it. % of analytically pure cesium oxide, stirred and mixed for 1 to 3 hours, and then added γ-Al2O3 with a mass fraction of 1.5-3.0 times that of nickel oxide. React with 1ml / L ammonia water, carefully control the pH value of the solution to rise continuously until the pH value of the solution reaches 8.5-9.0, stop adding ammonia water, continue to stir the obtained mixed solution for 2-4 hours, and then let it stand for 1-2 hours. Hour.

[0020] b. Evaporate the water in the solution to dryness under the conditions of 1 at...

Embodiment 1

[0023] First take analytically pure nickel oxide, dissolve it with dilute nitric acid with a molar concentration of 3ml / L, and configure a nickel nitrate solution with a concentration of 30% mass concentration, and then add analytically pure cesium oxide with a mass fraction of 25% nickel oxide to it , stirred and mixed for 3 hours, and then added γ-Al with a mass fraction of 3.0 times that of nickel oxide 2 o 3 , at a temperature of 55°C and under sufficient stirring conditions, add ammonia water with a molar concentration of 1ml / L dropwise to react, so that the pH value of the solution continues to rise until the pH value of the solution reaches 8.5, stop adding ammonia water, and continue to mix the obtained mixed solution Stir the reaction for 2 hours, then stand still for 1 hour, evaporate the water in the solution to dryness in the mixed solution after standing at 1 atmospheric pressure, 80°C and constant stirring, and dry the evaporated nano-powder at 120°C For 12 hour...

Embodiment 2

[0025] First take analytically pure nickel oxide, dissolve it with dilute nitric acid with a molar concentration of 3ml / L, and configure it into a nickel nitrate solution with a concentration of 40% by mass, then add analytically pure cesium oxide with a mass fraction of 30% of nickel oxide to it , stirred and mixed for 3 hours, and then added γ-Al with a mass fraction of 4.0 times that of nickel oxide 2 o 3 , at a temperature of 55°C and under sufficient stirring conditions, add ammonia water with a molar concentration of 1ml / L dropwise to react, so that the pH value of the solution continues to rise until the pH value of the solution reaches 9.0, stop adding ammonia water, and continue to mix the obtained mixed solution Stir the reaction for 4 hours, then stand still for 2 hours, evaporate the water in the solution to dryness under the condition of 1 atmosphere pressure, 95°C and constant stirring, and dry the nano powder at 120°C after standing still After 24 hours, the dr...

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Abstract

The invention discloses a nano NiO-CeO-Al2O3 oxygen carrier catalyst for hydrogen production by reforming water vapor. The nano NiO-CeO-Al2O3 oxygen carrier catalyst has reduction-oxidation performance and comprises the following components by mass percent: 10-30% of Ni, 0.5-10% of CeO and 60-85% of Al2O3. The invention further discloses a method of preparing the nano-powder catalyst. According to the method, the rising of pH value of reaction solution is controlled through coprecipitation. The nano NiO-CeO-Al2O3 oxygen carrier catalyst has the advantages as follows: the reduction-oxidation performance and heat stability are good; the cooperation of multiple surface active centers is brought into full play; the specific surface area is relatively large; the hydrogen productivity is relatively high; carbon deposition during the reaction process can be efficiently inhibited. The main raw materials adopted by the nano NiO-CeO-Al2O3 oxygen carrier catalyst are low-cost and abundant compounds. The preparation process of the nano NiO-CeO-Al2O3 oxygen carrier catalyst is simple and controllable, does not relate to complex equipment and complex procedures, and is low in cost and environmental-friendly.

Description

technical field [0001] The invention relates to a kind of hydrogen production nanometer NiO-CeO / Al with reduction and oxidation performance by steam reforming 2 o 3 An oxygen carrier catalyst, the main components of which are nickel oxide, cesium oxide and aluminum oxide, and a method for preparing the nano powder catalyst by means of co-precipitation to control the rise of the reaction pH value of the solution. Background technique [0002] At present, the world's hydrogen production mainly comes from steam reforming. Due to the need for a large amount of external heat supply, steam reforming generally consumes a lot of energy. Usually, in order to obtain a higher raw material conversion rate and hydrogen production selectivity, a higher reaction is also required. temperature, and use excess water vapor, the cost of hydrogen production is very high. The partial oxidation hydrogen production technology developed in recent years has the advantage of low energy consumption, ...

Claims

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Application Information

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IPC IPC(8): B01J23/83B01J23/78
Inventor 豆斌林宋永臣王超谢宝珍
Owner DALIAN UNIV OF TECH
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