Highly dispersed nickel within mesochannels of SBA-15 for CO methanation with enhanced activity and excellent thermostability
Highly dispersed nickel within mesochannels of SBA-15 for CO methanation with enhanced activity and excellent thermostability
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SBA-15介孔内高度分散的镍用于CO甲烷化，具有增强的活性和优异的热稳定性
DOI：
10.1016/j.fuel.2016.09.081
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发表时间：
2017-01-15
期刊：
影响因子：
7.4
通讯作者：
Lv, Yuhao
中科院分区：
文献类型：
--
作者：
Tao, Miao;Xin, Zhong;Lv, Yuhao
采用表面活性剂辅助浸渍法制备了几种镍基SBA-15催化剂，并将其应用于CO甲烷化反应。表征结果表明，通过添加合适的表面活性剂，Ni在SBA-15的有序介孔通道中分布均匀。对未焙烧催化剂和废催化剂经过100 h稳定性试验后的形貌进行了研究。表面活性剂可以抑制干燥过程中金属离子的迁移，抑制煅烧过程中NiO的聚集，最终改善镍的分散性。因此，表面活性剂辅助浸渍法制备的Ni/SBA-15催化剂由于镍与载体的相互作用适中、镍的比表面积高、载体的约束等特点，具有优异的活性和热稳定性。在350℃、0.3 MPa、15000 mL/g/h条件下，10% Ni/S15(3)催化剂的CO转化率为100%，CH4产率为99.9%。(C) 2016 Elsevier Ltd.版权所有。
In this work, several nickel-based SBA-15 catalysts were prepared by surfactant-assisted impregnation method and applied in CO methanation reaction. The characterization results showed that Ni species were uniformly distributed in the ordered mesoporous channels of SBA-15 by adding proper surfactants. The morphologies of the unroasted catalysts and spent catalysts after 100 h stability test were also investigated. The surfactant can hinder the migration of metal ions during drying and inhibit the aggregation of NiO during calcination, which ultimately improve the nickel dispersion. Consequently, the Ni/SBA-15 catalysts prepared with surfactant-assisted impregnation method exhibited superior activity and excellent thermostability owing to the moderate interaction between nickel and support, high nickel surface area and the confinement of support. The 10% Ni/S15(3) catalyst achieved the best activity with 100% CO conversion and about 99.9% CH4 yield at 350 degrees C, 0.3 MPa and 15,000 mL/g/h. (C) 2016 Elsevier Ltd. All rights reserved.