One-Pot Synthesis of Ordered Mesoporous NiSiAl Oxides for Catalyzing CO2 Reforming of CH4
One-Pot Synthesis of Ordered Mesoporous NiSiAl Oxides for Catalyzing CO2 Reforming of CH4
复制标题
一锅法合成有序介孔 NiSiAl 氧化物催化 CO2 重整 CH4
DOI：
10.1002/ejic.201600463
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发表时间：
2016
影响因子：
2.3
通讯作者：
Chou Lingjun
中科院分区：
文献类型：
--
作者：
Xiang Xianmei;Zhao Huahua;Yang Jian;Zhao Jun;Yan Liang;Song Huanling;Chou Lingjun
采用改进的蒸发诱导自组装方法制备了具有非晶相的有序介孔NiSiAl复合氧化物。SiO2在NiAl介孔骨架中的均匀分布改善了NiAl的有序介孔结构。对CO2重整CH 4的催化性能测试表明，NiSiAl在700 °C下具有比NiAl更高的催化活性和稳定性。结果表明，Si的掺杂提高了Al 2 O3的热稳定性，阻碍了Al 2 O3由非晶态向γ-Al 2 O3的转变，从而使Ni纳米颗粒在介孔中的均匀分散得以保持。稳定的Ni纳米颗粒增强了催化剂对积碳的抵抗力，从而提高了其耐久性。值得注意的是，即使在更严格的条件下（750 °C，200小时），NiSiAl-0.10也保留了其非晶Al 2 O3结构，并表现出出色的耐久性，几乎没有任何失活。
Ordered mesoporous NiSiAl composite oxides with an amorphous phase were prepared by an improved evaporation-induced self-assembly strategy. The silica was distributed homogeneously in the mesoporous skeleton and improved the ordered mesoporous structure of NiAl. Catalytic tests toward the CO2 reforming of CH4 indicated that the NiSiAl exhibited higher catalytic activity and stability over 100 h at 700 °C than NiAl. The enhanced performance results from the high thermal stability induced by Si doping, which hinders the Al2O3 phase transformation from amorphous to γ-Al2O3; therefore, the uniform dispersion of the Ni nanoparticles is retained owing to the confinement effect of the ordered mesopores. The stabilized Ni nanoparticles reinforced the resistance of the catalyst to carbon deposition and, thus, boosted its durability. Notably, even under more stringent conditions (750 °C, 200 h), NiSiAl-0.10 retained its amorphous Al2O3 structure and showed outstanding durability, almost without any deactivation.