Structural and textural evolution of Ni/γ-Al2O3 catalyst under hydrothermal conditions
Structural and textural evolution of Ni/γ-Al2O3 catalyst under hydrothermal conditions
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DOI：
10.1016/j.cattod.2010.07.015
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发表时间：
2010-12-22
期刊：
影响因子：
5.3
通讯作者：
Zhao, Yongxiang
中科院分区：
文献类型：
--
作者：
Li, Haitao;Xu, Yalin;Zhao, Yongxiang
采用x射线衍射（XRD）、H(2)-TPR、TG-DSC和N(2)物理吸附等手段研究了水热处理对Ni/ al (2)O(3)催化剂结构和织构性能的影响。经过90 ~ 150℃和8 ~ 48 h的水热处理后，γ - al (2)O(3)载体转变为其水合相薄水铝石[γ - alo (OH)]。γ - alo （OH）的含量随着水热温度和时间的增加而增加。此外，γ - al (2)O(3)载体的水化作用诱导了携带Ni晶的聚集，降低了BET的比表面积和孔体积，也降低了Ni与γ - al (2)O(3)载体的相互作用。上述结构和织构的变化进一步导致Ni/ γ - al (2)O(3)催化剂加氢活性的衰减。(C) 2010 Elsevier B.V.版权所有
The influence of hydrothermal treatment on the structural and textural properties of Ni/gamma-Al(2)O(3) catalysts is investigated by means of X-ray diffraction (XRD), H(2)-TPR, TG-DSC and N(2) physisorption. After hydrothermally treated at 90-150 degrees C and 8-48 h, the gamma-Al(2)O(3) support transforms into its hydrated phase, boehmite [gamma-AlO(OH)]. And the content of gamma-AlO(OH) increases with the hydrothermal temperature and time increasing. Furthermore, the hydration of gamma-Al(2)O(3) support induces the aggregation of carried Ni crystallite and decreases the BET specific surface area and pore volume, and also reduces the interaction between Ni and gamma-Al(2)O(3) support. The above structural and textural changes further cause the hydrogenation activity decay of Ni/gamma-Al(2)O(3) catalyst. (C) 2010 Elsevier B.V. All rights reserved.