How the iron oxide catalyst for EBDH is stabilized via Mn addition
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- 作者：Kotarba ; Andrzej ; Kruk ; Irmina ; Sojka ; Zbigniew
- 关键词：Styrene catalyst ; Alkali promoter ; Potassium ferrites ; Potassium desorption ; Manganese addition
- 刊名：Journal of Catalysis
- 出版年：2004
- 出版时间：January 25, 2004
- 年：2004
- 卷：221
- 期：2
- 页码：650-652
- 全文大小：192 K
文摘
The stability effect of Mn dopand on the potassium loss from β-ferrite, the active phase of a styrene catalyst, has been quantified for the first time in succinct measurements by means of a species-resolved (K and K+) thermal alkali desorption technique. Upon introduction of 2 wt % of Mn the desorption energies increased by 1.06 eV for ions, whereas the atomic barrier, which is crucial for the potassium volatilization, was enhanced by 1.52 eV. As a result, both K desorption fluxes are significantly extinguished.