一种高效稳定的乙醇蒸汽重整制氢Ni/SBA-15催化剂

IF 2.1 4区 化学 Q3 CHEMISTRY, PHYSICAL Progress in Reaction Kinetics and Mechanism Pub Date : 2020-01-01 DOI:10.1177/1468678319891842
Xia An, J. Ren, Wei-Ping Hu, Xu Wu, Xianmei Xie
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引用次数: 2

摘要

以两种不同镍源(硝酸镍和氨基磺酸镍)为载体,采用等体积浸渍法制备了sba -15负载的纳米NiO催化剂,进行了乙醇蒸汽重整制氢研究。采用N2吸附-脱附、x射线衍射、x射线光电子能谱和透射电镜等方法对催化剂进行了表征。在水蒸气、水/乙醇摩尔比为2:1 ~ 15:1、N2流量为20 ~ 120 mL min−1、温度为623 ~ 923 K的条件下,对两种不同Ni源催化剂进行了活性测试。硝酸镍源在823 K、水/乙醇= 6摩尔比、载气(N2)流量大于50 mL min - 1条件下具有较好的操作条件,而氨基磺酸镍源的最佳操作温度为773 K,其他条件与硝酸镍源相同。在排除内外扩散因素的影响后,由实验数据导出了经验幂律动力学速率方程。采用非线性回归方法对动力学参数进行了估计。计算了催化剂的活化能,负载型硝酸镍和氨基磺酸镍催化剂的活化能分别为25.345和41.449 kJ mol−1,与实验和模型预测结果一致。
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A highly efficient and stable Ni/SBA-15 catalyst for hydrogen production by ethanol steam reforming
The production of hydrogen by steam reforming of ethanol was carried out on SBA-15-supported nano NiO catalyst synthesized by the equivalent-volume impregnation method with two different Ni sources (nickel nitrate and nickel sulfamate). The catalyst was characterized by N2 adsorption–desorption, X-ray diffraction, X-ray photoelectron spectroscopy, and transmission electron microscopy to examine the physical and chemical properties. The activity tests were performed with the steam, with water/ethanol molar ratio ranging from 2:1 to 15:1, the N2 flow rate from 20 to 120 mL min−1 to determine the space-time, and the temperature range from 623 to 923 K on the two different Ni source catalysts. A favorable operating condition was established at 823 K using water/ethanol = 6 molar ratio and carrier gas (N2) flow of more than 50 mL min−1 for nickel nitrate source, but for nickel sulfamate source, the optimum temperature changed to 773 K and other conditions were the same as for the nickel nitrate source. After eliminating the influence of internal and external diffusion factors, an empirical power-law kinetic rate equation was derived from the experimental data. The non-linear regression method was used to estimate the kinetic parameter. The activation energy of the catalyst was then calculated, and the supported nickel nitrate and nickel sulfamate catalysts were 25.345 and 41.449 kJ mol−1, respectively, which was in agreement with the experimental and model-predicted results.
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来源期刊
CiteScore
2.10
自引率
0.00%
发文量
5
审稿时长
2.3 months
期刊介绍: The journal covers the fields of kinetics and mechanisms of chemical processes in the gas phase and solution of both simple and complex systems.
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