Dehydrogenation of Light Alkanes (A Review)

Melnikov, Dmitry; Новиков, А. А.; Glotov, Aleksandr; Reshetina, M. V.; Смирнова, Е. М.; Wang, Hongqiang; Винокуров, В. А.

doi:10.1134/s096554412209006

Cited by 9 publications

(6 citation statements)

References 163 publications

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“…Many metals have been tested for ethane dehydrogenation; among them, Cr-, Pt-, Fe-, and Co-containing systems are common catalysts [4][5][6][7][8]. Chromium catalysts are a costeffective option for the non-oxidative dehydrogenation of ethane, but they are susceptible to early deactivation [9].…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient PtSn/Al2O3 and PtSnZnCa/Al2O3 Catalysts for Ethane Dehydrogenation: Influence of Catalyst Pretreatment Atmosphere

Podila,

Al-Zahrani,

Daous

et al. 2024

Catalysts

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Increased demand for ethylene has motivated direct ethane dehydrogenation over Pt-based catalysts. PtSn/γ-Al2O3 and PtSnZnCa/γ-Al2O3 catalysts were investigated with the aim of understanding the effect of the pretreatment environment on the state of dispersed Pt for ethane dehydrogenation. The catalysts were prepared by the impregnation method and pretreated in different environments like static air (SA), flowing air (FA), and nitrogen (N2) atmospheres. A comprehensive characterization of the catalysts was performed using Brunauer–Emmett–Teller (BET), X-ray diffraction (XRD), Temperature-Programmed Reduction (TPR), NH3 Temperature-Programmed Desorption (NH3-TPD), X-ray photoelectron spectroscopy (XPS), and Transmission Electron Microscopy (TEM) techniques. The results reveal that the PtSn on Al2O3 catalyst pretreated in the static air environment (PtSn-SA) exhibits 21% ethylene yield with 95% selectivity at 625 °C. XPS analysis found more platinum and tin on the catalyst surface after static air treatment. The overall acidity of the catalysts decreased after thermal treatment in static air. Elemental mapping demonstrated that Pt agglomeration was pronounced in catalysts calcined under flowing air and nitrogen. These factors are responsible for the enhanced activity of the PtSn-SA catalyst compared to the other catalysts. The addition of Zn and Ca to the PtSn catalysts increases the yield of the catalyst calcined in static air (PtSnZnCa-SA). The PtSnZnCa-SA catalyst showed the highest ethylene yield of 27% with 99% selectivity and highly stable activity at 625 °C for 10 h.

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Section: Introductionmentioning

confidence: 99%

Highly Efficient PtSn/Al2O3 and PtSnZnCa/Al2O3 Catalysts for Ethane Dehydrogenation: Influence of Catalyst Pretreatment Atmosphere

Podila,

Al-Zahrani,

Daous

et al. 2024

Catalysts

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“…The revolution of shale gas and the prevalence of liquefied natural gas (LNG) technologies have increased the production of light alkanes, thus enhancing the interest in their dehydrogenation as a potential way to apply liquefied natural gas. Alkane dehydrogenation can be mainly achieved by non-oxidative or oxidative dehydrogenation [8][9][10]. It should be noted that thermodynamic dehydrogenation at high temperatures can result in the formation of undesirable by-products.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Performances of Co/TiO2 Catalysts in the Oxidative Dehydrogenation of Ethane to Ethylene: Effect of CoTiO3 and Co2TiO4 Phases Formation

Mahir¹,

Brik²,

Benzaouak³

et al. 2023

Preprint

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Co/TiO2 catalysts with different cobalt loadings (3.8, 7.5 and 15 wt%) were prepared by impreg-nation method of Co(NO3)2 .6H2O over titania. Samples containing Co(NO3)2 .6H2O and TiO2 in stoichiometric proportions in order to obtain CoTiO3 and Co2 TiO4 phases were also synthesized. The effect of the calcination treatment at two different temperatures, 550 and 1150 °C was investigated. Characterizations by several techniques, such as XRD UV-vis-NIR, DRS, Raman and XPS were carried out. XRD showed the coexistence of three phases: CoTiO3; Co2TiO4 and Co3O4 after calci-nation at 550°C, while the calcination at high temperature (1150°C) leads to single-phase systems (CoTiO3 or Co2TiO4). Diffuse reflection and XPS spectroscopy showed that divalent cobalt occupies octahedral sites in the ilmenite phase and both tetrahedral and octahedral sites in the spinel phase. The catalytic performances of the prepared catalysts, calcined at the two different temperatures, were evaluated in the oxidative dehydrogenation reaction (ODH) of ethane to ethylene. The con-version values were almost comparable for all the samples, calcined at 550 °C, and comparable the ethylene selectivity were recorded, slightly higher only in the case of CoTiO3. The calcination at 1150°C did not modify the overall activity (ethane conversion values around 20%), however, the production of COx becomes more significant. The study examined the influence of the reaction mixture composition, specifically the presence of water, and reveals a slight increase in the yield of ethylene accompanied by a decrease in the overall catalyst activity. This behavior is likely attributed to an increase in the surface concentration of hydroxyl species (OH), resulting in heightened surface acidity.

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“…The dehydrogenation thermodynamics requires high temperatures, which leads to increased by-product formation at high conversion rates. To achieve an acceptable propane conversion, temperatures above 550 • C and low pressures are required [9]. The oxidative process facilitates hydrogen removal and benefits the propylene yield but also increases undesirable deep oxidation.…”

Section: Introductionmentioning

confidence: 99%

“…CO 2 is a mild oxidant, which is favorable for the propylene yield. Additionally, CO 2 utilization is important for the sustainability of the petrochemical industry [9,13], where its chemical usage instead of release to the atmosphere is one of the most prospective utilization ways. Produced CO can be used for downstream petrochemical processes, such as oxo alcohols and Fischer-Tropsch synthesis.…”

Section: Introductionmentioning

confidence: 99%

“…Typical active components of non-oxidative dehydrogenation catalysts are platinum or metal oxides, such as chromia, vanadia, and molybdena [6]. In oxidative propane dehydrogenation, Pt-based catalysts are active in dry propane reforming, thus resulting in low selectivity to propylene [9]. Transition metal oxides are preferably active components for this process, facilitating the Mars-van Krevelen mechanism [14,15].…”

Section: Introductionmentioning

confidence: 99%

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Mesoporous Chromium Catalysts Templated on Halloysite Nanotubes and Aluminosilicate Core/Shell Composites for Oxidative Dehydrogenation of Propane with CO2

et al. 2023

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The oxidative dehydrogenation of alkanes is a prospective method for olefins production. CO2-assisted propane dehydrogenation over metal oxide catalysts provides an opportunity to increase propylene production with collateral CO2 utilization. We prepared the chromia catalysts on various mesoporous aluminosilicate supports, such as halloysite nanotubes, nanostructured core/shell composites of MCM-41/halloysite (halloysite nanotubes for the core; silica of MCM-41-type for the shell), and MCM-41@halloysite (silica of MCM-41-type for the core; halloysite nanotubes for the shell). The catalysts have been characterized by X-ray fluorescence analysis, low-temperature nitrogen adsorption, X-ray diffraction, temperature-programmed reduction, temperature-programmed desorption of ammonia, transmission electron microscopy with energy-dispersive X-ray spectroscopy, and thermogravimetric analysis. The catalysts’ performance in carbon-dioxide-assisted propane dehydrogenation has been estimated in a fixed-bed reactor at atmospheric pressure. The most stable catalyst is Cr/halloysite, having the lowest activity and the largest pore diameter. The catalyst, Cr/MCM-41/HNT, shows the best catalytic performance: having the highest conversion (19–88%), selectivity (83–30%), and space–time yield (4.3–7.1 mol C3H6/kg catalyst/h) at the temperature range of 550–700 °C. The highest space–time yield could be related to the uniform distribution of the chromia particles over the large surface area and narrow pore size distribution of 2–4 nm provided by the MCM-41-type silica and transport channels of 12–15 nm from the halloysite nanotubes.

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Dehydrogenation of Light Alkanes (A Review)

Cited by 9 publications

References 163 publications

Highly Efficient PtSn/Al2O3 and PtSnZnCa/Al2O3 Catalysts for Ethane Dehydrogenation: Influence of Catalyst Pretreatment Atmosphere

Highly Efficient PtSn/Al2O3 and PtSnZnCa/Al2O3 Catalysts for Ethane Dehydrogenation: Influence of Catalyst Pretreatment Atmosphere

Catalytic Performances of Co/TiO2 Catalysts in the Oxidative Dehydrogenation of Ethane to Ethylene: Effect of CoTiO3 and Co2TiO4 Phases Formation

Mesoporous Chromium Catalysts Templated on Halloysite Nanotubes and Aluminosilicate Core/Shell Composites for Oxidative Dehydrogenation of Propane with CO2

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