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 8 publications

(6 citation statements)

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“…The solution combustion synthesis (SCS) method was explored in this study, as it exhibits such advantages as the short reaction time and the concomitant formation of an inert gas, which prevents oxidation of Ce (III). Overall, SCS is one of the simplest, fast, and most efficient methods for the synthesis of both simple and complex metal oxides [32,33] allowing the production of high-purity homogeneous powders [34].…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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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%

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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“…Unlike other methods that use furnaces for the calcination process, in this method, direct microwave irradiation is used in calcination. However, this method has several disadvantages such as the high cost of equipment and the limited size of the reactor (Matveyeva et al, 2022).…”

Section: Microwavementioning

confidence: 99%

Study of the efficiency of ZnAl2O4 as green nanocatalyst

Birhi,

Laka

2024

Inornatus Biol. Educ. J.

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Waste from chemical reactions is still a hot issue to be discussed today. Green chemistry in its concept offers catalysts as an alternative to reducing waste resulting from chemical reactions. This literature study aims to examine the method of making ZnAl2O4 nanocatalysts and doping materials that are more effective in various reactions by considering the advantages and disadvantages of each. The content of the study includes the ZnAl2O4 nanocatalyst synthesis method, combination catalyst, and catalytic effectiveness in chemical reactions. Combustion, sol-gel, co-precipitation, hydrothermal, and microwave are the most common methods in the synthesis of ZnAl2O4. The use of precursors, fuel, and precipitating agents are very important factors when using combustion, sol-gel, and co-precipitation methods. Other factors that need to be considered are the raw material ratio, pH, and calcination temperature. The pH of the solution is 6-9 and the calcination temperature of 600oC – 800oC is the ideal point for producing nanocatalyst. The calcination temperature is lower to 300oC – 500oC when using hydrothermal and microwave as a synthesis method. ZnAl2O4 nanocatalyst has been identified as having good catalytic activity, but not higher than ZnAl2O4 combined with other catalysts. The combination of a catalyst with ZnAl2O4 spinel in hydrogenation, dehydrogenation, esterification, degradation, and organic synthesis has high catalytic activity with a conversion rate and selectivity of >70%.

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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 8 publications

References 65 publications

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

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

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

Study of the efficiency of ZnAl2O4 as green nanocatalyst

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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 8 publications

References 65 publications

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

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

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

Study of the efficiency of ZnAl2O4 as green nanocatalyst

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Product

Resources

About

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