NaCl和B2O3在修饰FeOχ催化剂中的协同作用

引用本文: 熊国兴, 夏新瑞, 陈恒荣, 郭燮贤. NaCl和B₂O₃在修饰FeO_χ催化剂中的协同作用[J]. 物理化学学报, 1994, 10(11): 971-977. doi: 10.3866/PKU.WHXB19941103 shu

Citation: Xiong Guo-Xing, Xia Xin-Rui, Chen Heng-Rong, Guo Xie-Xian. Synergetic Effect between NaCl and B₂O₃ in Modified FeO_χ Catalysts[J]. Acta Physico-Chimica Sinica, 1994, 10(11): 971-977. doi: 10.3866/PKU.WHXB19941103 shu

NaCl和B₂O₃在修饰FeO_χ催化剂中的协同作用

摘要:

应用连续催化反应，XPS，XRD，H2－TPR,O2－TPD和In－situ Mossbauer谱等方法表征了一系列组成不同的NaCl／B2O3／Fe2O3催化剂．结果表明NaCl与B2O3在修饰FeOx催化剂上存在明显的协同作用，B2O3调变了FeOx的还原能力，NaCl修饰了B2O3／FeOx使之具有很高的还原速度与晶格氧气化速度．催化剂的催化性能同这种协同作用密切相关．

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English

Synergetic Effect between NaCl and B₂O₃ in Modified FeO_χ Catalysts

1.
State Key Laboratory of Catalysis,Dalian Institute of Chemical Physics,Chinese Academy of Science,Dalian 116023
Received Date: 30 August 1993
Available Online: 15 November 1994

Abstract:

A series of NaCl/B2O3/Fe2O3 catalysts having a B/Fe atomic ratio from 0 to 0.3 and 0.25 of Na/Fe atomic ratio were prepared for the oxidative coupling of methane (OCM). It was noted that NaCl and B2O3 show a synergetic effect: NaCl/Fe2O3 produces mainly CO2, but B2O3/ Fe2O3 and B2O3/NaCl have poor activity. NaCl/B2O3/Fe2O3 catalyst has however high activity and selectivity. When the addition of B2O3 approaches 15 (at)%, the C2 yield and selectivity reach their maxima, 17% and 75% respectively. The C2H4/C2 ratio is as high as 76%. XRD, XPS, H2-TPR, O2-TPD and In-situ Mossbauer were employed to investigate the properties of the catalysts. Results show there is a synergetic effect between NaCl and B2O3 on FeOx surface. B2O3 modifies the redox ability of Fe2O3. The NaCl modified B2O3/FeOx has high reduction and lattice oxygen evaporation rates at 750℃. The high activity and selectivity of the NaCl/B2O3/FeOx catalyst are closely related with this synergetic effect.

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

NaCl和B₂O₃在修饰FeO_χ催化剂中的协同作用

English

Synergetic Effect between NaCl and B₂O₃ in Modified FeO_χ Catalysts

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