Mesoporous Beta zeolite functionalisation with FexCry oligocations; catalytic activity in the NH3SCO process

Rutkowska, Małgorzata; Duda, Mariusz; Macina, Daniel; Górecka, Sylwia; Dębek, Radosław; Moreno, José María; Díaz, Urbano; Chmielarz, Lucjan

doi:10.1016/j.micromeso.2018.11.003

Cited by 25 publications

(11 citation statements)

References 56 publications

(96 reference statements)

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“…In the case of ion-exchange with "conventional" salt of Fe(II), iron was introduced preferably in the form of monomeric cations, possibly located in ion-exchange positions, with the small contribution of more aggregated species. The obtained results are consistent with our previous studies focused on modification of other zeolites, like ZSM-5 and Beta, with iron Fe3(III) oligocations [45,53,54]. Higher activity in N 2 O decomposition of the samples prepared by ion-exchange with Fe3(III) oligocations (Fe(O,IE)MCM-22 and Fe(O,IE)ITQ-2) was connected to the presence of oligomeric iron species.…”

Section: Discussionsupporting

confidence: 91%

Modification of MCM-22 Zeolite and Its Derivatives with Iron for the Application in N2O Decomposition

et al. 2020

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Layered 2D zeolite MCM-22 and its delaminated derivative, ITQ-2, were modified with iron, by different methods (ion-exchange and direct synthesis), and with the use of different precursors (FeSO4∙7H2O, Fe(NO3)3∙9H2O, and [Fe3(OCOCH3)7∙OH∙2H2O]NO3 oligocations. The applied modifications were aimed at optimization of iron form in the samples (aggregation, amount, location, and reducibility), in order to achieve the highest catalytic activity in the N2O decomposition. The synthesis of the samples was verified with the use of XRD (X-Ray Diffraction), N2-sorption and ICP-OES (Inductively Coupled Plasma Optical Emission Spectroscopy) techniques, while the form of iron in the samples was investigated by UV–vis-DRS (UV–vis diffuse reflectance spectroscopy), H2-TPR (Hydrogen Temperature-Programmed Reduction) and HRTEM (High-Resolution Transmission Electron Microscopy). The highest activity in the N2O decomposition presented the sample Fe(O,IE)MCM-22, prepared by ion-exchange of MCM-22 with Fe3(III) oligocations. This activity was related to the oligomeric FexOy species (the main form of iron in the sample) and the higher loading of active species (in comparison to the modification with FeSO4∙7H2O).

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Section: Discussionsupporting

confidence: 91%

Modification of MCM-22 Zeolite and Its Derivatives with Iron for the Application in N2O Decomposition

et al. 2020

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“…As shown in Figure , the N 2 adsorption–desorption isotherm was used to investigate the porosity of a series of MEL zeolites. All samples possessed a large slope at relatively low pressures ( P / P 0 < 0.1), corresponding to the type-I isotherms with microporous properties . At the relative high pressure ( P / P 0 > 0.45), H-MEL-31, H-MEL@Cu-47, H-MEL@Cu-30, and H-MEL@Cu-26 showed type-IV isotherm with a H2 hysteresis loop corresponding to capillary condensation in the mesopores. , The P-MEL and P-MEL@Cu did not show a hysteresis loop at the relatively high pressure ( P / P 0 > 0.45), indicating that the P-MEL and P-MEL@Cu only possessed the microporous property.…”

Section: Resultsmentioning

confidence: 96%

Fabrication of Cu-Encapsulated Hierarchical MEL Zeolites for Alkylation of Mesitylene with Benzyl Alcohol

Huang

Liu

Liao

et al. 2019

Ind. Eng. Chem. Res.

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We reported a perfect strategy for the fabrication of Cu-encapsulated hierarchical MEL zeolites by a simple post-desilication−recrystallization strategy. The Cuencapsulated hierarchical MEL zeolites exhibited extraordinary selectivity in the liquid alkylation reaction of mesitylene and benzyl alcohol compared with hierarchical MEL zeolites, indicating that the additional Cu species located in the matrix of MEL zeolites can effectively inhibit self-etherification of benzyl alcohol. In addition, the selectivity of 2-benzyl-1,3,5trimethylbenzene for the Cu-containing hierarchical MEL zeolites was in the order of

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“…zeolites, mesoporous silica sieves) with transition metals (e.g. Cu, Fe, Co) is an effective way to increase their activity in the selected reactions of the environmental catalysis [5][6][7][8][9][10][11][12]. One of the processes from the environment protection sector, which proceeds on the red-ox active sites, is selective catalytic oxidation of ammonia to dinitrogen (NH3-SCO, AMOX).…”

Section: Introductionmentioning

confidence: 99%

Selective ammonia oxidation over ZSM-5 zeolite: Impact of catalyst’s support porosity and type of deposited iron species

et al. 2020

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In the presented studies an influence of different parameters, such as zeolite sample porosity, form of used iron source ([Fe3(OAc)6O(H2O)3] + oligocations or FeSO4 solutions) and method of iron species deposition (ion-exchange, impregnation), on the catalytic activity in the process of the selective catalytic oxidation of ammonia (NH3-SCO) was studied. Conventional and mesoporous ZSM-5 zeolites, obtained by desilication and modified with iron species, were analysed with respect to their textural, surface and crystalline properties (N2-sorption, HRTEM, XRD) as well as the form of introduced Fe species (UV-vis-DRS). Ion-exchange with [Fe3(OAc)6O(H2O)3] + oligocations and impregnation with these

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Mesoporous Beta zeolite functionalisation with FexCry oligocations; catalytic activity in the NH3SCO process

Cited by 25 publications

References 56 publications

Modification of MCM-22 Zeolite and Its Derivatives with Iron for the Application in N2O Decomposition

Modification of MCM-22 Zeolite and Its Derivatives with Iron for the Application in N2O Decomposition

Fabrication of Cu-Encapsulated Hierarchical MEL Zeolites for Alkylation of Mesitylene with Benzyl Alcohol

Selective ammonia oxidation over ZSM-5 zeolite: Impact of catalyst’s support porosity and type of deposited iron species

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