Concurrent reduction for improving the performance of the dehydrogenation of alkanes
AssigneeSabic Global Technologies B.V.
InventorsYongMan Choi, Ramsey Bunama, Khalid M. El-Yahyaoui
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Abstract
A process of catalytically dehydrogenating an alkane to an alkene, using Cr2O3 as a catalyst, where the catalyst is reduced concurrently with the dehydrogenation by using CO as a reducing gas. In reducing the catalyst with CO, CO2 is produced, which may be reacted with H2 produced by the dehydrogenation, to form CO and H2O by the reverse water-gas shift reaction. A Cu O heat-releasing material may be included with the catalyst in the reactor. The CO reducing gas reduces CuO to form Cu and CO2, releasing heat. The CO2 produced by reducing the Cu O may also be reacted with H2 produced by the dehydrogenation, to form CO and H2O by the reverse water-gas shift reaction.
Claims19
A process of dehydrogenating an alkane to an alkene, comprising:
- feeding an alkane feedstock and a first amount of CO to a reactor containing a catalyst comprising Cr2O3;
- and
- contacting the alkane feedstock with the catalyst to form an alkene and H2;
- wherein, during the contacting:
- a first portion of the first amount of CO fed to the reactor reduces the CrO3 to form Cr2O3 and CO2;
- a portion of the CO2 reacts with the H2 to form H2O and a second amount of CO;
- and
- a first portion of the second amount of CO reduces the CrO3 to form Cr2O3 and CO2.
A process of dehydrogenating an alkane to an alkene, comprising:
- feeding an alkane feedstock and a first amount of CO to a reactor containing a heat-releasing material comprising CuO and a catalyst comprising Cr2O3;
- contacting the alkane feedstock with the catalyst to form an alkene and H2;
- and
- concurrently regenerating the catalyst with CO, wherein the regeneration forms a regenerated catalyst in which more than 90% by mass of chromium in the catalyst is in the form of Cr2O3;
- wherein, during the contacting:
- a first portion of the first amount of CO fed to the reactor reduces the CrO3 to form Cr2O3 and CO2;
- a second portion of the first amount of CO fed to the reactor reduces the CuO to form Cu and CO2;
- a portion of the CO2 reacts with the H2 to form H2O and a second amount of CO;
- a first portion of the second amount of CO reduces the CrO3 to form Cr2O3 and CO2;
- and
- a second portion of the second amount of CO reduces the CuO to form Cu and CO2.
Dependencies are inferred from the claim text.