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Citation: Xu Bai-Qing, Yamaguchi Tsutomu, Tanabe Kozo, Liang Juan, Zheng Lu-Bin. Characterization of Acid-Base Property of ZrO₂ by Thermal Desorption: II. Dual Adsorption of NH₃ and CO₂[J]. Acta Physico-Chimica Sinica, ;1994, 10(02): 114-120. doi: 10.3866/PKU.WHXB19940205 shu

Characterization of Acid-Base Property of ZrO₂ by Thermal Desorption: II. Dual Adsorption of NH₃ and CO₂

1.
Department of Chemistry, School of Chemical Engineering, Dalian University of Technology, Dalian 116012

Received Date: 18 May 1992
Available Online: 15 February 1994

Dual adsorption of NH_3 and CO_2 has been used to study the acid property of ZrO_2 in relation to its base property by TPD and IR spectroscopy. It is found that preadsorbed NH_3 (or CO_2) has no inhibitory but a promotive effect to a postadsorption of CO2 (or NH_3). The increased adsorption of the postadsorbed moecules is most pronounced in the TPD curves at above 510 K. In the IR observation, the dual adsorption effect is characterized by a formation, on one hand, of a monodentate carbonate species which can not be formed in the single adsorption of CO_2, and by a strengthened bonding of NH_3 to surface acid site (Zr~(4+)) on the other hand. These results suggest that there exists not only independently located acid and base sites, responsible for the adsorption of NH_3 and CO_2, but some sites located closely (i.e acid-base pair sites). A surface induced through-bond acid-base interaction seems to be the nature of the dual adsorption effect.
- Zirconium dioxide,
- Acid-base interaction,
- Surface induced interaction,
- TPD,
- IR,
- NH₃,
- CO₂
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Characterization of Acid-Base Property of ZrO2 by Thermal Desorption: II. Dual Adsorption of NH3 and CO2

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Characterization of Acid-Base Property of ZrO₂ by Thermal Desorption: II. Dual Adsorption of NH₃ and CO₂