Key properties of Ni–MgO–CeO2, Ni–MgO–ZrO2, and Ni–MgO–Ce(1−x)Zr(x)O2 catalysts for the reforming of methane with carbon dioxide,Green Chemistry

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Key properties of Ni–MgO–CeO2, Ni–MgO–ZrO2, and Ni–MgO–Ce(1−x)Zr(x)O2 catalysts for the reforming of methane with carbon dioxide
Green Chemistry ( IF 9.3 ) Pub Date : 2018-03-02 00:00:00 , DOI: 10.1039/c7gc03605a
Won-Jun Jang _{1,

2,

3,

4} , Hak-Min Kim _{1,

2,

3,

4} , Jae-Oh Shim _{1,

2,

3,

4} , Seong-Yeun Yoo _{1,

2,

3,

4} , Kyung-Won Jeon _{1,

2,

3,

4} , Hyun-Suk Na _{1,

2,

3,

4} , Yeol-Lim Lee _{1,

2,

3,

4} , Dae-Woon Jeong _{4,

5,

6,

7,

8} , Jong Wook Bae _{4,

9,

10,

11} , In Wook Nah _{4,

12,

13,

14} , Hyun-Seog Roh _{1,

2,

3,

4}

Affiliation

CeO₂, ZrO₂, and CeO₂–ZrO₂ supported on MgO-promoted Ni catalysts are developed and applied to the reforming of methane with carbon dioxide. The catalysts are prepared by the one-step co-precipitation/aging method and characterized through various techniques such as X-ray diffraction, Brunauer–Emmet–Teller measurements, pore distribution, X-ray photoelectron spectroscopy, X-ray absorption near edge spectroscopy, extended X-ray absorption fine structure analysis, H₂-temperature programmed reduction, H₂-chemisorption, Raman analysis, thermogravimetry analysis, and pulse H₂–CO₂ reactions. Ni–MgO–CeO₂ shows the smallest Ni particle size and the particle size decreases with increasing ZrO₂ content. Ni–MgO–Ce_0.6Zr_0.4O₂ exhibits the largest oxygen storage capacity among the prepared catalysts. The size of the Ni particles and the oxygen storage capacity are found to be the primary and secondary key factors that influence the catalytic performance, respectively. The turnover frequency is dependent on the size of the Ni particles, but the catalytic performance is affected by the number of Ni active sites, which is estimated from the reduction degree and Ni particle size. Overall, the Ni–MgO–Ce_0.8Zr_0.2O₂ catalyst shows the best performance owing to the high reduction degree and small Ni particle size.

中文翻译：

Ni–MgO–CeO ₂，Ni–MgO–ZrO ₂和Ni–MgO–Ce _{（1- x）} Zr _（x） O ₂催化剂的关键性质，用于甲烷与二氧化碳的重整

研究了负载在MgO促进的Ni催化剂上的CeO ₂，ZrO ₂和CeO ₂ -ZrO ₂，并将其应用于二氧化碳对甲烷的重整。催化剂是通过一步共沉淀/老化方法制备的，并通过多种技术进行了表征，例如X射线衍射，Brunauer-Emmet-Teller测量，孔分布，X射线光电子能谱，X射线近边缘吸收法，扩展的X射线吸收精细结构分析，H _2-程序升温还原，H _2-化学吸附，拉曼分析，热重分析和脉冲H ₂ -CO ₂反应。Ni–MgO–CeO ₂示出最小的Ni粒径，并且粒径随着ZrO ₂含量的增加而减小。Ni-MgO-Ce _0.6 Zr _0.4 O ₂在制备的催化剂中具有最大的储氧能力。发现Ni颗粒的尺寸和储氧能力分别是影响催化性能的主要和次要关键因素。周转频率取决于Ni颗粒的尺寸，但是催化性能受Ni活性位点数量的影响，其由还原度和Ni颗粒尺寸估计。总体而言，Ni-MgO-Ce _0.8 Zr _0.2 O ₂ 催化剂由于还原度高和Ni粒径小而表现出最好的性能。

更新日期：2018-04-03

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