Synthesis and characterization of well dispersed nickel-incorporated SBA-15 and its high activity in syngas methanation reaction
Synthesis and characterization of well dispersed nickel-incorporated SBA-15 and its high activity in syngas methanation reaction
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分散良好的镍掺SBA-15的合成、表征及其在合成气甲烷化反应中的高活性
DOI：
10.1016/j.apcata.2016.02.019
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发表时间：
2016-04
期刊：
影响因子：
--
通讯作者：
Jia Gu
中科院分区：
文献类型：
--
作者：
Miao Tao;Xin Meng;Zhong Xin;Zhicheng Bian;Yuhao Lv;Jia Gu
以氢氧化钠（NaOH）为pH调节剂，正硅酸乙酯（TEOS）为硅源，采用pH调节法成功合成了含镍SBA-15材料。透射电子显微镜（TEM）和H2脉冲化学吸附结果表明，pH调节法制备的Ni-S15催化剂比传统浸渍法制备的Ni/S15催化剂镍颗粒更细小、分散更均匀。Ni-S15（pH 8）和Ni/S15的镍分散度分别为3.6%和2.5%。此外，pH值强烈影响引入二氧化硅框架中的镍的量。并考察了该催化剂在合成气甲烷化制合成天然气反应中的催化性能。采用pH调节法制备的Ni-S15（pH 8）催化剂在350 °C、0.3 MPa、15000 mL/g/h条件下，CO转化率为100%，CH 4产率为98.6%。同时，由于NiO与载体之间的强相互作用，Ni-S15（pH 8）催化剂具有良好的稳定性和耐高温性能。
Ni-incorporated SBA-15 materials were successfully synthesized by pH adjusting method using sodium hydroxide (NaOH) as the pH regulator and tetraethyl orthosilicate (TEOS) as the silica source. The results of transmission electron microscope (TEM) and H2pulse chemisorption showed that nickel particles of the Ni-S15 catalysts prepared by pH adjusting method were much finer and more uniform dispersion than those of Ni/S15 catalyst prepared by traditional impregnation method. The nickel dispersions of Ni-S15(pH8) and Ni/S15 were 3.6% and 2.5%, respectively. In addition, the pH value strongly affected the amount of nickel introduced in the silica framework. The catalytic performances were also investigated for synthetic natural gas (SNG) production via syngas methanation reaction. The Ni-S15(pH8) catalyst prepared by pH adjusting method achieved the best activity with 100% CO conversion and 98.6% CH4yield at 350 °C, 0.3 MPa and 15000 mL/g/h. Meanwhile, the Ni-S15(pH8) catalyst possessed excellent stability and high-temperature-resistant performance due to the strong interaction between NiO and support.
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