高等学校化学学报

高等学校化学学报 ›› 1990, Vol. 11 ›› Issue (10): 1158.

• 研究简报 • 上一篇    下一篇

稀土和碱土钼氧化物上甲烷选择氧化

崔湘浩, 魏诠, 李向伟, 马英德   

  1. 吉林大学化学系
  • 收稿日期:1988-12-04 出版日期:1990-10-24 发布日期:1990-10-24
  • 通讯作者: 崔湘浩, 邮编: 130023
  • 基金资助:

    国家自然科学基金

Studies on the Selective Oxidation of Methane over Magnesium and Rare Earth Molybdatcs

Cui Xianghao, Wei Quan, Li Xiangwei, Ma Yingde   

  1. Department of Chemistry, Jilin University, Changchun
  • Received:1988-12-04 Online:1990-10-24 Published:1990-10-24

PDF (PC)

被引次数

1

摘要： 白钨石ABO4复合氧化物在烯烃氧化中起着重要作用,但在烷烃催化氧化中的研究并不多,有关稀土氧化物催化剂的研究则更少[1]。

关键词: CeMoO4, 甲烷氧化, 甲醛

Abstract: The ABO4 type of Mg, Ln(La, Ce, Eu)molybdates has been used as catalysts to convert CH4 to HCHO. ESR, TPR and XRD measurements show that molybdenum near the neighbour oxygen ions take part in oxidation reaction. When molybdenum ions were fixed as the atom Band the atomic ratio A/B was changed, the atoms at site A were substituted by Mg,La,Ce,Eu, the structure of catalysts take varied type, such as, a-MgMoO4, a-La2(MoO4)3, Eu2(MoO4)3 etc. The selectivity of formaldehyde increased according to the following. order MgMoO4<Eu2(MoO4)3<La2(MoO4)3< Ce2(MoO4)3. The catalysts of the CeMoO4 series gave a higher selectivity for formaldehyde, which well coordinate oxygen inserting and dehydrogenation functions, but showed no selectivity for both CO2 and coupling products. The befunctional effect for oxygen inserting and dehydrogenation was dependent to the electronegativity of A and B atoms, and the lattice structure of catalysts.

Key words: Methane, Formaldehyde, Cerium molybdate.

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