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CuO/La₂O₃-Al₂O₃催化剂中CuO物种的迁移和高温固相反应

Transference of CuO Species and Solid-Solid Interaction in CuO/La₂O₃-Al₂O₃ Catalyst

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【Author】 Yang Xiaodong~(1,2),He Mai~1,Fang Ping~1,Xiao Shanmei~2,Luo Mengfei~(1*) (1.Zhejiang Key Laboratory for gor Reactive Chemistry on Solid Surfaces,Institute of Physical Chemistry,Zhejiang Normal University,Jinhua 321004,China;2.Jinhua College of Professional & Technology,Jinhua 321017,China)

【机构】浙江师范大学物理化学研究所浙江省固体表面反应化学重点实验室；金华职业技术学院；浙江师范大学物理化学研究所浙江省固体表面反应化学重点实验室浙江金华321004；浙江金华321017；浙江金华321004；

【摘要】采用XRD、激光Raman光谱和TPR技术研究了CuO/La2O3-Al2O3催化剂中CuO高温迁移及固相反应。结果表明,800℃焙烧的CuO(20%)/La2O3(x%)-Al2O3催化剂,低La2O3负载量(5%和10%)时,La2O3(x%)-Al2O3载体表面即存在CuO和少量CuAl2O4;当La2O3负载量增大(≥20%)时,由于La2O3的阻止作用,使得CuO无法迁移到La2O3内层和Al2O3反应生成CuAl2O4,从而使CuO稳定存在于催化剂表层。高温焙烧(≥900℃),La2O3的隔离作用下降,从而导致生成CuAl2O4。更多还原

【Abstract】 CuO species and thermal solid-solid interaction in CuO/La₂O₃-Al₂O₃ were investigated by XRD,Raman spectroscopy and H₂-TPR technique.The experimental results show that for CuO/La₂O₃（x%）-Al₂O₃ catalysts calcined at 800 ℃,both CuO and a small quantity of CuAl₂O₄ present on the surface of the La₂O₃（x%）-Al₂O₃ support with the low content of La₂O₃.With increasing the content of La₂O₃,it can effectively hinder the transference of CuO into the internal of La₂O₃ layer and the formation of CuAl₂O₄.With further increasing the calcined temperatures,the function of separation of La₂O₃ decreases,then CuAl₂O₄ forms as a result of solid-solid interaction between CuO and Al₂O₃.更多还原