Catalyst supports based on ZnO–ZnAl<sub>2</sub>O<sub>4</sub> nanocomposites with enhanced selectivity and coking resistance in isobutane dehydrogenation

Matveyeva, Anna N.; Omarov, Shamil O.; Nashchekin, A. V.; Попков, В.И.; Murzin, Dmitry Yu.

doi:10.1039/d2dt02088b

Cited by 3 publications

(2 citation statements)

References 65 publications

(54 reference statements)

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“…It was the most significant weight loss during the entire process, which was closely related to the burning of coke substances in the air atmosphere. Generally, the quantity of coke substances generated on the spent catalyst is positively correlated with the weight loss on the TG curve . To analyze the reasons for the differences in the amount of coke deposition, the acid–base properties of Al–Cs/SiO 2 were characterized (Figure S2).…”

Section: Resultsmentioning

confidence: 99%

“…Generally, the quantity of coke substances generated on the spent catalyst is positively correlated with the weight loss on the TG curve. 34 To analyze the reasons for the differences in the amount of coke deposition, the acid−base properties of Al−Cs/SiO 2 were characterized (Figure S2). The desorption peak below 150 °C represents the weak acid−base sites, while the desorption peak ranging from 150 to 350 °C represents the medium acid and base sites and a desorption peak above 350 °C represents the strong acid and base sites.…”

Section: Effect Of Al Doping On Cokementioning

confidence: 99%

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Unraveling the Coking and Deactivation Behavior of Al–Cs/SiO₂ Catalyst in the Aldol Condensation of Methyl Propionate with Formaldehyde

Ran,

Zhu,

Zhang

et al. 2024

Ind. Eng. Chem. Res.

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The loaded acid−base bifunctional catalysts exhibit good catalytic performance in the synthesis of methyl methacrylate via aldol condensation of methyl propionate with formaldehyde, but they still suffer from deactivation caused by coke deposition. In this paper, coke deposition as well as consequential deactivation behavior of Cs/SiO 2 catalyst loaded with various amounts of Al was investigated under different reactant compositions by using nuclear magnetic resonance, thermogravimetric, Brunauer−Emmett−Teller, and Raman analysis. As a result, coke on the catalyst was characterized by amorphous coke deposition, which was mainly composed of polycyclic aromatic hydrocarbons and aliphatic substances. Al added to the 10Cs/SiO 2 catalyst significantly reduced the amount of coke deposition and inhibited the C/H ratio of coke. Appropriate amounts of Al and reactant compositions could ultimately increase the stability of the catalyst. Moreover, the kinetics of coke deposition observed on the Al−Cs/SiO 2 catalyst was studied. It was found that the Voorhies equation modified using the variables of reaction temperature and reactants composition could accurately forecast coke accumulation on the 3.5Al-10Cs/SiO 2 catalyst under specific conditions.

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Section: Resultsmentioning

confidence: 99%

Section: Effect Of Al Doping On Cokementioning

confidence: 99%

Unraveling the Coking and Deactivation Behavior of Al–Cs/SiO₂ Catalyst in the Aldol Condensation of Methyl Propionate with Formaldehyde

Ran,

Zhu,

Zhang

et al. 2024

Ind. Eng. Chem. Res.

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Photoluminescent Coatings on Zinc Alloy Prepared by Plasma Electrolytic Oxidation in Aluminate Electrolyte

et al. 2023

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Thick ZnO/ZnAl2O4 coatings were synthesized on zinc alloy Z1 substrates through plasma electrolytic oxidation (PEO) for different anodization times. The prepared coatings were characterized by scanning SEM, XRD, diffuse reflectance and photoluminescence spectroscopy in order to establish the relationship between their structural and optical properties and PEO processing parameters. Under different PEO processing conditions (anodization time—1–10 min and applied voltage—370 and 450 V) ceramic coatings with a mean thickness of 2–12 μm were prepared. XRD analysis explored the coating structure composed of zinc oxide (wurtzite) and zinc aluminate spinel. The content of ZnAl2O4 in the coatings grows with increasing the applied voltage and anodization time. Photoluminescence (PL) measurements showed that the PEO coatings have several bands in the visible and near-infrared regions associated with their composite structure. The PL spectra significantly depend on the PEO processing parameters due to varying ZnO and ZnAl2O4 content in the coatings. The insight in the relationship between the ZnAl2O4 structure and the photoluminescent properties of ZnO/ZnAl2O4 coatings has been provided using the combination of XRD and luminescence spectroscopy.

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CeFeO3–CeO2–Fe2O3 Systems: Synthesis by Solution Combustion Method and Catalytic Performance in CO2 Hydrogenation

et al. 2022

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Rare-earth orthoferrites have found wide application in thermocatalytic reduction-oxidation processes. Much less attention has been paid, however, to the production of CeFeO3, as well as to the study of its physicochemical and catalytic properties, in particular, in the promising process of CO2 utilization by hydrogenation to CO and hydrocarbons. This study presents the results of a study on the synthesis of CeFeO3 by solution combustion synthesis (SCS) using various fuels, fuel-to-oxidizer ratios, and additives. The SCS products were characterized by XRD, FTIR, N2-physisorption, SEM, DTA–TGA, and H2-TPR. It has been established that glycine provides the best yield of CeFeO3, while the addition of NH4NO3 promotes an increase in the amount of CeFeO3 by 7–12 wt%. In addition, the synthesis of CeFeO3 with the participation of NH4NO3 makes it possible to surpass the activity of the CeO2–Fe2O3 system at low temperatures (300–400 °C), as well as to increase selectivity to hydrocarbons. The observed effects are due to the increased gas evolution and ejection of reactive FeOx nanoparticles on the surface of crystallites, and an increase in the surface defects. CeFeO3 obtained in this study allows for achieving higher CO2 conversion compared to LaFeO3 at 600 °C.

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Catalyst supports based on ZnO–ZnAl₂O₄ nanocomposites with enhanced selectivity and coking resistance in isobutane dehydrogenation

Abstract: Development of coking resistant supports and catalysts for hydrocarbons conversion is challenging, especially when using such acidic materials as alumina. Apparently, this problem can be mitigated by using spinels that...

Cited by 3 publications

References 65 publications

Unraveling the Coking and Deactivation Behavior of Al–Cs/SiO₂ Catalyst in the Aldol Condensation of Methyl Propionate with Formaldehyde

Unraveling the Coking and Deactivation Behavior of Al–Cs/SiO₂ Catalyst in the Aldol Condensation of Methyl Propionate with Formaldehyde

Photoluminescent Coatings on Zinc Alloy Prepared by Plasma Electrolytic Oxidation in Aluminate Electrolyte

CeFeO3–CeO2–Fe2O3 Systems: Synthesis by Solution Combustion Method and Catalytic Performance in CO2 Hydrogenation

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Catalyst supports based on ZnO–ZnAl2O4 nanocomposites with enhanced selectivity and coking resistance in isobutane dehydrogenation

Abstract: Development of coking resistant supports and catalysts for hydrocarbons conversion is challenging, especially when using such acidic materials as alumina. Apparently, this problem can be mitigated by using spinels that...

Cited by 3 publications

References 65 publications

Unraveling the Coking and Deactivation Behavior of Al–Cs/SiO2 Catalyst in the Aldol Condensation of Methyl Propionate with Formaldehyde

Unraveling the Coking and Deactivation Behavior of Al–Cs/SiO2 Catalyst in the Aldol Condensation of Methyl Propionate with Formaldehyde

Photoluminescent Coatings on Zinc Alloy Prepared by Plasma Electrolytic Oxidation in Aluminate Electrolyte

CeFeO3–CeO2–Fe2O3 Systems: Synthesis by Solution Combustion Method and Catalytic Performance in CO2 Hydrogenation

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Product

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Catalyst supports based on ZnO–ZnAl₂O₄ nanocomposites with enhanced selectivity and coking resistance in isobutane dehydrogenation

Unraveling the Coking and Deactivation Behavior of Al–Cs/SiO₂ Catalyst in the Aldol Condensation of Methyl Propionate with Formaldehyde

Unraveling the Coking and Deactivation Behavior of Al–Cs/SiO₂ Catalyst in the Aldol Condensation of Methyl Propionate with Formaldehyde