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The Preparation of 3DOM Ni/CeO2 and Its Application to Ethanol Reforming

Author: LiZhongWen
Tutor: LiuYuan
School: Tianjin University
Course: Industrial Catalysis
Keywords: 3D ordered macroporous Colloidal crystal template method Ethanol Steam reforming Hydrogen Production Nickel Cerium oxide
CLC: TQ426
Type: Master's thesis
Year: 2009
Downloads: 44
Quote: 0
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Abstract


Biomass hydrogen production will be one of the future energy. Ethanol steam reforming supply hydrogen fuel cell, is an application of promising hydrogen technology. Nickel-based catalysts in the ethanol reforming reaction of concern due to the high activity and low cost, but sintering resistance and resistance to coking capacity needs to be further improved. The purpose of this thesis is that the synthesis of three-dimensional ordered macroporous materials (3DOM), and applied to the ethanol steam reforming reaction, in order to improve the reaction selectivity and stability. This study and preparation factors affect its catalytic properties and structure. This article was prepared by colloidal crystal template method with a three-dimensional ordered macroporous materials investigated in detail during the preparation of the influencing factors, and tested the 3DOM Ni/CeO2 catalytic performance in ethanol steam reforming reaction. The following conclusions: 1. Centrifugal self-assembly method, centrifugation speed affect the colloidal crystal template void, thereby affecting the three-dimensional ordered macroporous structure. Small centrifuge speed, maintain a high three-dimensional ordered more conducive prepared 3DOM catalyst pore structure in the larger area within. Preparing a catalyst template selection evaporative self-assembly method is faster and more efficient. 2 in the process of the filler precursor solution, should be chosen metal nitrate aqueous citric acid complexation to adjust the pH value to 8, and citric acid with a metal ion molar ratio of 1.5:1, with ethanol to adjust the concentration to 1.0 mol / L, appropriate. 3. 3DOM Ni/CeO2 catalyst preparation method and the catalyst calcination temperature shall affect 3DOM the orderliness of the catalyst pore structure, but the impact of the reaction activity and selectivity of the catalyst. 4. Performance of the active ingredient content, calcination temperature, catalyst preparation conditions the 3DOM Ni/CeO2 catalyst ethanol steam reforming reaction. The best preparation conditions were as follows: the Ni content of 20wt%, and the calcination temperature was 550 ° C. 5. 3DOM catalyst prepared in the filling method, the precursor solution of pH = 1 showed high activity, the dipping method, the precursor solution of pH = 8 prepared 3DOM catalysts exhibit high selectivity. A 6. 3DOM Ni/CeO2 catalyst decreased stability of the reforming reaction in the destruction of the pore structure of Ethanol. XRD and TPR experimental results show that one of the highly dispersed nickel is the key active ingredient, the degree of dispersion and NiO has a great influence on the performance of the catalyst.

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CLC: > Industrial Technology > Chemical Industry > Reagents and the production of pure chemicals > Catalyst ( catalyst )
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