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碳纳米管负载的Fe2O3催化剂制备 总被引:4,自引:0,他引:4
Carbon nanotubes were modified by FeSO4-H2O2 system, iron hydroxides were adsorbed on the wall of carbon nanotubes simultaneously. These precursors were treated at 723K for 2 h under hydrogen, nitrogen and air atmosphere to prepare carbon nanotubes supported γ-Fe2O3catalyst, γ-Fe2O3and α-Fe2O3compound catalyst and amorphous Fe2O3catalyst, respectively. This is green method to prepare high Fe2O3loading (≥50 %) catalyst without adding other cation. The different structures Fe2O3catalysts can be synthesized by controlling the condition of thermal treatment to content active phase requirements for different catalytic reactions. The paper presents a new method to prepare carbon nanotubes supported catalysts. 相似文献
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利用电子探针能谱(EDS)、扫描电子显微镜(SEM)、X-射线衍射(XRD)对Ni-Pb/C催化剂进行了表征。结果表明,在250℃下,催化剂使用160h仍有高的活性,未发现有积炭现象。但在300℃时,活性下降,收率降至30%。在高温条件下,Pb富集在催化剂表面上,使Ni^0活性中心数量减少,导致催化剂失活。当温度回复到250℃时,催化剂活性又慢慢地恢复。这种失活是可逆的。 相似文献
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载体对醇气相羰基化镍催化剂的影响 总被引:10,自引:0,他引:10
载体对醇气相羰基化镍催化剂的影响彭峰冯景贤黄仲涛(华南理工大学化工学院化工系,广州510641)关键词催化剂,羰基化,载体,相互作用甲醇、乙醇的气相羰基化近二十年来引起了许多研究者的关注,在寻找一种廉价高效的非贵金属取代铑催化剂方面已取得了一定进展... 相似文献
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