Lower alkanes dehydrogenation: Strategies and reaction routes to corresponding alkenes

James, Olusola O.; Mandal, Sandip; Alele, Nkem; Chowdhury, Biswajit; Maity, Sudip

doi:10.1016/j.fuproc.2016.04.016

Cited by 123 publications

(75 citation statements)

References 182 publications

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“…The logic that underlies this is the evidence that dehydrogenation is the more difficult reaction. Although alkanes can exchange hydrogen at low temperatures on a catalyst surface [30,31,37] indicating that breaking the first C-H bond in an alkane is not necessarily difficult, removal of the second hydrogen is rate determining and thermodynamic limits ensure that high temperatures are needed [38,39]. In contrast the addition of hydrogen to an alkyne or alkadiene is thermodynamically favoured at most temperatures.…”

Section: Catalytic Processes For Trans-hydrogenationmentioning

confidence: 99%

Catalytic upgrading of refinery cracked products by trans-hydrogenation: a review

Garba

Jackson

2016

Appl Petrochem Res

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The production of high premium fuel is an issue of priority to every refinery. The trans-hydrogenation process is devised to convert two low valued refinery cracked products to premium products; the conversion processes involve the combination of dehydrogenation and hydrogenation reaction as a single step process. The paper reviews the recent literature on the use of catalysts to convert low value refinery products (i.e. alkanes and alkynes or alkadienes) to alkenes (olefins) by trans-hydrogenation. Catalysts based on VO x , CrO x and Pt all supported on alumina have been used for the process. However, further studies are still required to ascertain the actual reaction mechanism, mitigating carbon deposition and catalyst deactivation, and the role of different catalysts to optimize the reaction desired products.

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Section: Catalytic Processes For Trans-hydrogenationmentioning

confidence: 99%

Catalytic upgrading of refinery cracked products by trans-hydrogenation: a review

Garba

Jackson

2016

Appl Petrochem Res

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“…Among the catalytic systems reported in the literature (including patents) in the oxidative dehydrogenation of ethane, there are four groups that are especially interesting: (i) supported vanadium oxide catalysts ; (ii) promoted and supported nickel oxide catalysts [4,11,[28][29][30][31][32]; (iii) MoVTe(Sb) multicomponent oxides presenting an orthorhombic bronze structure (M1 phase) [1,2,11,33,34]; and (iv) catalysts based on non-reducible metal oxides [11,35]. In the present article we will focus on the first group.…”

Section: Introductionmentioning

confidence: 99%

“…Vanadium oxide based catalysts are well known and extensively employed in industry for the gas phase heterogeneous oxidation and ammoxidation of hydrocarbons [1][2][3][4] and for the oxidative dehydrogenation of short chain alkanes, including ethane [4][5][6][7][8][9][10][11][12]. Supported vanadium oxide catalysts have been considered for many years the most promising catalysts in the ODH of C 2 -C 4 alkanes [4][5][6][7][8][9][10][11][12][13][14], although the nature of the optimal support is different depending on the nature of the alkane fed [5][6][7]14,15].…”

Section: Introductionmentioning

confidence: 99%

“…Supported vanadium oxide catalysts have been considered for many years the most promising catalysts in the ODH of C 2 -C 4 alkanes [4][5][6][7][8][9][10][11][12][13][14], although the nature of the optimal support is different depending on the nature of the alkane fed [5][6][7]14,15]. The catalytic behavior of supported vanadia catalysts can be related to [5][6][7][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]: (i) the nature of V n+ -O species, i.e., coordination, aggregation and oxidation state of V-species; (ii) the redox properties of the catalysts, i.e., the V 5+ /V 4+ ratio in reaction conditions, which are influenced by the presence of promoters and the nature of the metal oxide support; and (iii) the acid-base character of the catalysts (and support), which strongly influences the adsorption of reactants and the desorption of partial oxidation products and finally determines the selectivity to olefins.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, methanol transformation can be summarized into three principal reactions [36][37][38][39]: (i) oxidation reactions which need oxygen (molecular or supplied by the catalyst), involving the formation of formaldehyde, formic acid and carbon oxides; (ii) dehydration reactions, which do not need oxygen, carried out by acid catalysts which are involved in the formation of DME; and (iii) both redox and acid reactions, involved in the formation of dimethoxymethane and methyl formate. Several metal oxides, including supported vanadium oxides catalysts, have been studied for methanol oxidation [4,[36][37][38][39]. In addition, a comparison between catalytic performance for oxidation of methanol [39][40][41][42][43] or ethanol [44] and propane ODH has been reported in the last years.…”

Section: Introductionmentioning

confidence: 99%

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Vanadium Supported on Alumina and/or Zirconia Catalysts for the Selective Transformation of Ethane and Methanol

et al. 2018

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Vanadium supported on pure (Al 2 O 3 , ZrO 2 ) or mixed zirconia-alumina (with Al/(Al + Zr) ratio of 0.75 or 0.25) catalysts have been prepared by wet impregnation, using homemade prepared supports. The catalysts have been characterized and tested in the oxidative dehydrogenation (ODH) of ethane and in the methanol aerobic transformation. The catalytic performance strongly depends on the nature of the metal oxide support. Thus, activity decreases in the order: VOx/ZrO 2 > VOx/(Al,Zr-oxides) > VOx/Al 2 O 3 . On the other hand, at low and medium ethane conversions, the selectivity to ethylene presents an opposite trend: VOx/Al 2 O 3 > VOx/(Al,Zr-oxides) > VOx/ZrO 2 . The different selectivity to ethylene at high conversion is due to the lower/higher initial ethylene formation and to the extent of the ethylene decomposition. Interestingly, VOx/(Al,Zr-oxides) with low Zr-loading present the lowest ethylene decomposition. The catalytic results obtained mainly depend on the nature of the supports whereas the role of the dispersion of vanadium species is unclear. In methanol oxidation, the catalysts tested present similar catalytic activity regardless of the support (Al 2 O 3 , ZrO 2 or mixed Al 2 O 3 -ZrO 2 ) but strong differences in the selectivity to the reaction products. Thus, dimethyl ether was mainly observed on alumina-supported vanadium oxide catalysts (which is associated to the presence of acidic sites on the surface of the catalyst, as determined by TPD-NH 3 ). Formaldehyde was the main reaction product on catalysts supported on Zr-containing oxides (which can be related to a low presence of acid sites). In this article, the importance of the presence of acid sites in ethane ODH, which can be estimated using the methanol transformation reaction, is also discussed.

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Propylene

Akah,

Xu,

AlHerz

2024

Kirk‐Othmer Encyclopedia of Chemical Technology

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This article provides an overview of propylene's properties, production methods, and its significance in the chemical industry. Propylene is a colorless, flammable hydrocarbon gas, which is used as a petrochemical building block. It is primarily produced as a by‐product of ethylene production from the steam cracking of hydrocarbons. Propylene is used in the synthesis of a wide range of products, including polypropylene plastics, acrylonitrile, propylene oxide, and acrylic acid. The demand for propylene has been steadily increasing due to its versatility and the growth of industries such as automotive, construction, and packaging.

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Lower alkanes dehydrogenation: Strategies and reaction routes to corresponding alkenes

Cited by 123 publications

References 182 publications

Catalytic upgrading of refinery cracked products by trans-hydrogenation: a review

Catalytic upgrading of refinery cracked products by trans-hydrogenation: a review

Vanadium Supported on Alumina and/or Zirconia Catalysts for the Selective Transformation of Ethane and Methanol

Propylene

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