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

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, ...

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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 oxygen carrier used in chemical looping reforming hydrogen production must have good catalytic reforming hydrogen production performance in its reduced state. Our research found that NiO / Al 2 o 3 Has better steam reforming hydrogen production performance (Binlin Dou et al., Bioresoure Technology 100 (2009) 3540-3547; BinlinDou et al., Bioresoure Technology 101 (2010) 2436-2442; Chao Wang, Binlin Dou et al., International Journal of Hydrogen Energy 38 ( 2013) 3562-3571.), has a high oxygen carrying capacity, but it is easy to deposit carbon, and it is easy to sinter at a high temperature, which reduces its performance. Due to its high specific surface area, nano powder will be extremely Greatly improve the physical and chemical properties of catalyst particles. Therefore, it is an urgent need to develop a low-cost water vapor reforming hydrogen production nano-oxygen carrier catalyst with good reduction and oxidation performance, good anti-coking performance, and good stability. The problem