Promotional effects of CO2 on the oxidative dehydrogenation of propane over mesoporous VOX/γAl2O3 catalysts

Balogun, Majid L.; Adamu, Sagir; Ba-Shammakh, M.; Hossain, Mohammad M.

doi:10.1016/j.jiec.2020.12.022

Cited by 25 publications

(22 citation statements)

References 93 publications

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“…The rate of propane conversion is significantly decreased in the absence of vanadium or sulfur (Figures S12–S13), highlighting the importance of both vanadium and the oxidant for the catalytic performance. The slight background activity of the support is likely due to the acidic nature of alumina, as was reported in previous literature [11] . Furthermore, the propylene selectivity does not fall with increasing quantities of oxidant (Figure S11), as reported for other ODH systems due to homogeneous hydrocarbon combustion [12] .…”

Section: Figuresupporting

confidence: 80%

“…Although V/Al 2 O 3 catalysts have also been studied for ODHP with N 2 O and CO 2 as oxidants, differences in reaction conditions and catalyst compositions prevent meaningful comparisons of these systems with the present SODHP. However, as shown in Table 2, the propylene selectivity of SODHP is generally competitive with N 2 O and CO 2 oxidants over V/Al 2 O 3 catalysts [25,11] . Additionally, Clark and coworkers have previously shown that the addition of H 2 S to an ODHP feed either without catalyst or over xV/Al 2 O 3 significantly enhances the selectivity to propylene, possibly due to the in‐situ formation of an active sulfur species [27] .…”

Section: Figurementioning

confidence: 99%

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Supported Vanadium Catalysts for Selective Sulfur‐Oxidative Dehydrogenation of Propane

et al. 2021

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The catalytic oxidative dehydrogenation of propane (ODHP) is a challenging reaction due to facile competing overoxidation to COx. The gaseous disulfur molecule, S2, is isoelectronic with O2 and has been shown to act as an alternative, “soft oxidant” for the analogous process (SODHP) over bulk metal sulfide catalysts. However, these bulk catalysts suffer from low surface areas and ill‐defined active sites – issues that might be addressed with a supported catalyst. Here we investigate supported V/Al2O3 materials for SODHP. We show that these catalysts are highly selective for propylene, far surpassing the yields of the prior bulk systems. Isolated sulfided vanadium species are found to be more active and selective than crystalline vanadium sulfide. Additionally, we compare the S2 and O2 oxidants over sulfided and calcined V/Al2O3 materials, respectively, and find that the propylene selectivity is enhanced using S2 as the oxidant. These results suggest that sulfur is a promising soft oxidant that can be used to achieve high propylene selectivities over supported metal sulfides.

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Section: Figuresupporting

confidence: 80%

Section: Figurementioning

confidence: 99%

Supported Vanadium Catalysts for Selective Sulfur‐Oxidative Dehydrogenation of Propane

et al. 2021

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“…Finally, CO 2 can also mask non-selective sites on the catalyst surface, thus increasing the selectivity and, sometimes, the conversion. 170…”

Section: Light Olefin Synthesis From Hydrocarbonsmentioning

confidence: 99%

Light olefin synthesis from a diversity of renewable and fossil feedstocks: state-of the-art and outlook

et al. 2022

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“…could significantly improve the dispersion of surface VO x species and resulted in the formation of surface Na-metavanadate. Subsequently, Hossain et al introduced La 2 O 3 into Al 2 O 3 supports to obtain a VO x /La 2 O 3 -Al 2 O 3 catalyst for the CO 2 -ODHP [87]. They found that the introduction of La decreased the reducibility and total acidity of the catalyst, resulting in an improvement of propylene selectivity.…”

Section: Vanadium-based Catalystsmentioning

confidence: 99%

“…Especially, in the CO 2 -ODHP reaction catalyzed by a VO x /c-Al 2 O 3 , the whole reaction involved ODH of propane to propylene, RWGS, reverse Boudouard reaction, oxidation reaction, and catalyst re-oxidation with CO 2 , respectively. CO 2 could also reoxidize the VO x-1 to VO x [87].…”

Section: Promote Redox Cycle Of Redox-active Metal Oxidesmentioning

confidence: 99%

Research progress of CO2 oxidative dehydrogenation of propane to propylene over Cr-free metal catalysts

Wang

et al. 2022

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CO 2 -assisted oxidative dehydrogenation of propane (CO 2 -ODHP) is an attractive strategy to offset the demand gap of propylene due to its potentiality of reducing CO 2 emissions, especially under the demands of peaking CO 2 emissions and carbon neutrality. The introduction of CO 2 as a soft oxidant into the reaction not only averts the over-oxidation of products, but also maintains the high oxidation state of the redox-active sites. Furthermore, the presence of CO 2 increases the conversion of propane by coupling the dehydrogenation of propane (DHP) with the reverse water gas reaction (RWGS) and inhibits the coking formation to prolong the lifetime of catalysts via the reverse Boudouard reaction. An effective catalyst should selectively activate the C-H bond but suppress the C-C cleavage. However, to prepare such a catalyst remains challenging. Chromium-based catalysts are always applied in industrial application of DHP; however, their toxic properties are harmful to the environment. In this aspect, exploring environment-friendly and sustainable catalytic systems with Cr-free is an important issue. In this review, we outline the development of the CO 2 -ODHP especially in the last ten years, including the structural information, catalytic performances, and mechanisms of chromium-free metal-based catalyst systems, and the role of CO 2 in the reaction. We also present perspectives for future progress in the CO 2 -ODHP.

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Promotional effects of CO2 on the oxidative dehydrogenation of propane over mesoporous VOX/γAl2O3 catalysts

Cited by 25 publications

References 93 publications

Supported Vanadium Catalysts for Selective Sulfur‐Oxidative Dehydrogenation of Propane

Supported Vanadium Catalysts for Selective Sulfur‐Oxidative Dehydrogenation of Propane

Light olefin synthesis from a diversity of renewable and fossil feedstocks: state-of the-art and outlook

Research progress of CO2 oxidative dehydrogenation of propane to propylene over Cr-free metal catalysts

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