Ni/MWCNT及镧改性Ni/MWCNT催化CO<sub>2</sub>甲烷化反应的性能

引用本文: 张荣斌, 梁蕾, 曾宪荣, 商金艳, 汪涛, 蔡建信. Ni/MWCNT及镧改性Ni/MWCNT催化CO₂甲烷化反应的性能[J]. 物理化学学报, 2012, 28(08): 1951-1956. doi: 10.3866/PKU.WHXB201206041 shu

Citation: ZHANG Rong-Bin, LIANG Lei, ZENG Xian-Rong, SHANG Jin-Yan, WANG Tao, CAI Jian-Xin. Catalytic Properties of Ni /MWCNT and La-Promoted Ni /MWCNT for Methanation of Carbon Dioxide Reaction[J]. Acta Physico-Chimica Sinica, 2012, 28(08): 1951-1956. doi: 10.3866/PKU.WHXB201206041 shu

Ni/MWCNT及镧改性Ni/MWCNT催化CO₂甲烷化反应的性能

基金项目:
国家自然科学基金(21166018) (21166018)

江西省教育厅科技项目(GJJ10291)资助 (GJJ10291)

摘要:

以多壁碳纳米管(MWCNT)为载体, 通过浸渍法制备了负载型镍催化剂和稀土镧改性的镍催化剂, 并对其二氧化碳甲烷化的催化性能进行了研究. 借助比表面积测试、程序升温还原(TPR)、X射线衍射(XRD)和X射线光电子能谱(XPS)等表征手段研究了稀土镧的添加对Ni/MWCNT催化剂结构和表面组成、催化剂还原性能以及CO₂甲烷化反应性能的影响. 结果表明: 稀土镧改性的Ni/MWCNT较Ni/MWCNT催化剂具有更好的CO₂甲烷化活性, 镧组分的加入提高了催化剂表面的镍物种浓度和分散度, 弱化了氧化镍与载体MWCNT之间的相互作用, 促进了氧化镍的还原, 同时提高了表面镍物种的电子密度, 增加了对反应物的吸附能力, 从而提高了其CO₂甲烷化活性. 制备过程中稀土镧的添加次序对催化性能有较明显的影响, 其活性顺序为先浸渍镧后浸渍镍制备的催化剂活性明显好于先浸渍镍后浸渍镧制备的催化剂.

关键词:

English

Catalytic Properties of Ni /MWCNT and La-Promoted Ni /MWCNT for Methanation of Carbon Dioxide Reaction

1.
Department of Chemistry, Nanchang University, Nanchang 310031, P. R. China
Received Date: 20 February 2012
Available Online: 10 July 2012
Fund Project:
国家自然科学基金(21166018)

江西省教育厅科技项目(GJJ10291)资助

Abstract:

Nickel multiwalled carbon nanotubes (Ni/MWCNT) and lanthanum-promoted Ni/MWCNT were successfully synthesized by impregnation. Methanation of carbon dioxide was used as a probe to evaluate their catalytic performance. N₂-BET, temperature programmed reduction (TPR), X-ray powder diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) were used to study the advantageous effects of La on the structure, surface composition, reduction properties and reaction performance of Ni/MWCNT. It was found that La-promoted Ni/MWCNT catalysts showed better catalytic activity for the reaction than the un-promoted. The addition of La to Ni/MWCNT improves the concentration and dispersion of the active NiO component on the catalyst surface, thus weakening the interaction between support and NiO species, which in turn improves the electron density at the NiO species. As a consequence, the adsorption of reactants was enhanced and the activity improved. Moreover, the sequence in which La was added was also studied in this work. Ni-La/MWCNT, in which La was impregnated onto the MWCNT first, shows better catalytic performance than La-Ni/MWCNT, where the Ni was impregnated first.

Key words:

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沈阳化工大学材料科学与工程学院沈阳 110142

Ni/MWCNT及镧改性Ni/MWCNT催化CO₂甲烷化反应的性能

English

Catalytic Properties of Ni /MWCNT and La-Promoted Ni /MWCNT for Methanation of Carbon Dioxide Reaction

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English

Catalytic Properties of Ni /MWCNT and La-Promoted Ni /MWCNT for Methanation of Carbon Dioxide Reaction

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

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CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

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