Literature Report

Feng Jiang 2013.5.10

Dehydrogenation high-energy costs

coke formation

ODH with O2 Low selectivity

ODH with CO2 CO2soft oxidant

Carbon dioxide utilization as a soft oxidant and promoter in catalysis

Mohd Bismillah Ansari and Sang-Eon Park*

Energy Environ. Sci., 2012, 5, 9419-9437

Role of CO2

form CO and oxygen species and change the dehydrogenation pathway in an oxidative manner

alleviate the chemical equilibrium in ODH H2 +CO2 → CO + H2O

suppress coking via a decoking reaction C+CO2 → 2CO

4

acid–base properties：

Without CO2 With CO2

surface/lattice oxygen species：

R–CH2CH3 +MOx → R–CH=CH2 +H2O+MOx-1

MOx-1 +CO2 → MOx + CO

CO2 maintains the lattice oxygen of the catalyst

Nihao

M16Ox +C18O2 → M18O16Ox-1+ C18O16O

M16Ox +C18O2 → M18O216Ox-2+ C16O2

18O isotope experiment

MS record: C18O2,m/z 48; C18O16O,m/z 46; C16O2, m/z 44

MOx-1 +CO2 → MOx + CO really exists

Chromium, and Vanadium oxide-based catalysts

Gallium, Indium oxide-based catalysts

Redox mechanism

√

×

(1)

(2)

(4)

(3)

B.J. Xu, B. Zheng, W.M. Hua, Y.H. Yue, Z. Gao, J. Catal. 239 (2006) 470-477.

(5)

B.J. Xu, B. Zheng, W.M. Hua, Y.H. Yue, Z. Gao, J. Catal. 239 (2006) 470-477.

With CO2

(6)

(6)>>(5)

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