Influence of Li loading on the catalytic performance of Li/MgO in the oxidative dehydrogenation of propane to olefins

WU Yi-min; LI Shuo; LI Chun-yi

Volume 44 Issue 11

Nov. 2016

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Article Navigation > Journal of Fuel Chemistry and Technology > 2016 > 44(11): 1334-1340

WU Yi-min, LI Shuo, LI Chun-yi. Influence of Li loading on the catalytic performance of Li/MgO in the oxidative dehydrogenation of propane to olefins[J]. Journal of Fuel Chemistry and Technology, 2016, 44(11): 1334-1340.

Citation:

WU Yi-min, LI Shuo, LI Chun-yi. Influence of Li loading on the catalytic performance of Li/MgO in the oxidative dehydrogenation of propane to olefins[J]. Journal of Fuel Chemistry and Technology, 2016, 44(11): 1334-1340.

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Influence of Li loading on the catalytic performance of Li/MgO in the oxidative dehydrogenation of propane to olefins

State Key Laboratory of Heavy Oil Processing, China University of Petroleum (East China), Qingdao 266580, China

Funds:

The project was supported by the Key Project of National Nature Science Foundation of China Petroleum and Chemical Joint Funds U1362201

Received Date: 2016-06-23
Rev Recd Date: 2016-07-21

Available Online: 2021-01-23

Publish Date: 2016-11-10

Abstract

Abstract

A series of Li/MgO catalysts with different Li loadings were prepared by incipient wetness impregnation method and characterized by TG-DTA, N₂ sorption and XRD; two modes for propane adsorption on Li/MgO were considered by calculation with Material Studio and the influence of Li loading on the catalytic performance of Li/MgO in the oxidative dehydrogenation of propane to olefins was investigated. The result indicated that with the increase of Li loading, the conversion of propane and the selectivity to C₂H₄, C₂H₆, CH₄, CO_x increases at first, reaches the highest values at a Li loading of 3% and then decreases with further increasing the Li loading, whereas the selectivity to propene changes in an opposite trend. The adsorption and dehydrogenation of propane on Li/MgO surface are controlled by both thermodynamic and kinetic factors, whilst the dispersion of the active Li⁺O^- sites is related to the loading of Li. Over the highly-dispersed active Li⁺O^- sites, the dehydrogenation is thermodynamically controlled, which favors the formation of propene, whereas over the poorly-dispersed Li⁺O^- sites, the reaction is dominated by the kinetic factor, leading to a high selectivity to ethene and other by-products.
- propane,
- oxidative dehydrogenation,
- Li/MgO,
- olefins,
- Li loading,
- dispersion

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References(26)

References

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