The Study of CrOx-Containing Catalysts Supported on ZrO2, CeO2, and CexZr(1–x)O2 in Isobutane Dehydrogenation

Bugrova, Tatiana; Mamontov, G. V.

doi:10.1134/s0023158418020027

Cited by 10 publications

(4 citation statements)

References 36 publications

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“…Owing to this higher operating temperature, the productivity obtained stands out among those reported in the literature for CODH (Fig. 4): The production rate of isobutylene achieved at 675°C under MWH is about five times higher than that obtained on V/C act , the best catalyst for isobutane CODH (30) among the available literature (7,10,27,(31)(32)(33)(34)(35). This is due to the fact that the V/C act catalyst was used in a conventionally heated reactor, and therefore, the operating temperature was limited to 600°C to avoid the dominance of homogeneous contributions.…”

Section: Discussionsupporting

confidence: 52%

Escaping undesired gas-phase chemistry: Microwave-driven selectivity enhancement in heterogeneous catalytic reactors

et al. 2019

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Research in solid-gas heterogeneous catalytic processes is typically aimed toward optimization of catalyst composition to achieve a higher conversion and, especially, a higher selectivity. However, even with the most selective catalysts, an upper limit is found: Above a certain temperature, gas-phase reactions become important and their effects cannot be neglected. Here, we apply a microwave field to a catalyst-support ensemble capable of direct microwave heating (MWH). We have taken extra precautions to ensure that (i) the solid phase is free from significant hot spots and (ii) an accurate estimation of both solid and gas temperatures is obtained. MWH allows operating with a catalyst that is significantly hotter than the surrounding gas, achieving a high conversion on the catalyst while reducing undesired homogeneous reactions. We demonstrate the concept with the CO2-mediated oxidative dehydrogenation of isobutane, but it can be applied to any system with significant undesired homogeneous contributions.

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Section: Discussionsupporting

confidence: 52%

Escaping undesired gas-phase chemistry: Microwave-driven selectivity enhancement in heterogeneous catalytic reactors

et al. 2019

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“…Recently, ZrO 2 has become a promising candidate as a support for CrO x -containing PDH catalysts [39][40][41]. This is connected with its capability to stabilize CrO x species on the surface [42] and also with its own activity in dehydrogenation of hydrocarbons [43], with monoclinic ZrO 2 showing a higher rate of propene formation and higher propene selectivity as compared to tetragonal zirconia.…”

Section: Introductionmentioning

confidence: 99%

Influence of Cr/Zr Ratio on Activity of Cr–Zr Oxide Catalysts in Non-Oxidative Propane Dehydrogenation

Zubkov¹,

Bugrova²,

Salaev³

et al. 2021

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Two series of chromium–zirconium mixed oxide catalysts with different Cr/Zr molar ratio are prepared by co-precipitation method. Porous structure of the catalysts is studied by low-temperature N2 adsorption–desorption. Phase composition and chromium states in the catalysts are characterized by X-ray diffraction (XRD), UV-visible spectroscopy, and temperature-programmed reduction with hydrogen (TPR-H2). The mixed catalysts are tested in non-oxidative dehydrogenation of propane at 550 °C. The catalysts synthesized without ageing of precipitate show higher activity in propane dehydrogenation due to the higher content of reducible Cr+5/+6 species due to its stabilization on the ZrO2 surface.

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“…Many metal material catalysts, such as platinum-based, chromium-based, vanadium-based and molybdenum-based catalysts, have been intensively investigated and reported on in regard to the dehydrogenation reaction [13][14][15][16]. In particular, chromium-based catalysts have been found to exhibit high catalytic activity for the dehydrogenation of low-carbon alkanes and have been widely used in commercial processes [17,18]. The addition of promoters (alkali metals or rare earth metals) could bring a positive effect for promoting both the activity and selectivity of chromium-based dehydrogenation catalysts [7,18].…”

Section: Introductionmentioning

confidence: 99%

“…In particular, chromium-based catalysts have been found to exhibit high catalytic activity for the dehydrogenation of low-carbon alkanes and have been widely used in commercial processes [17,18]. The addition of promoters (alkali metals or rare earth metals) could bring a positive effect for promoting both the activity and selectivity of chromium-based dehydrogenation catalysts [7,18]. The introduction of the Ga element into the chromium-based catalyst has been shown to enhance the catalyst stability at least in 60 cycles without changes in catalytic activity and selectivity during tests of isobutane dehydrogenation [19].…”

Section: Introductionmentioning

confidence: 99%

Ca-Doped CrOX/γ-Al2O3 Catalysts with Improved Dehydrogenation Performance for the Conversion of Isobutane to Isobutene

et al. 2019

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The dehydrogenation of low-carbon alkane to obtain olefins is an effective way to meet the steadily increasing demand of these building blocks in chemical industry. In this study, Ca-doped CrOx/γ-Al2O3 catalysts were fabricated via a one-pot method by employing Cr(OH)3 as the precursor, and their catalytic performances were tested in the dehydrogenation of isobutane to isobutene (DITI) process. The prepared catalysts were intensively characterized by XRD, SEM, NH3-TPD, H2-TPR, low-temperature N2 adsorption–desorption, etc. These characterization results indicated that the doping of Ca into the CrOx/γ-Al2O3 catalysts could tune the acidity properties of the prepared catalysts and enhance the interaction between the active species and support. The Ca-doped CrOx/γ-Al2O3 catalysts, especially the Ca2-Cr/γ-Al2O3 catalyst with a Ca doping of 2 wt%, exhibited a superior catalytic performance in the DITI process in comparison with the undoped catalyst.

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The Study of CrOx-Containing Catalysts Supported on ZrO2, CeO2, and CexZr(1–x)O2 in Isobutane Dehydrogenation

Cited by 10 publications

References 36 publications

Escaping undesired gas-phase chemistry: Microwave-driven selectivity enhancement in heterogeneous catalytic reactors

Escaping undesired gas-phase chemistry: Microwave-driven selectivity enhancement in heterogeneous catalytic reactors

Influence of Cr/Zr Ratio on Activity of Cr–Zr Oxide Catalysts in Non-Oxidative Propane Dehydrogenation

Ca-Doped CrOX/γ-Al2O3 Catalysts with Improved Dehydrogenation Performance for the Conversion of Isobutane to Isobutene

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