Characterizations and Catalytic Properties of Chromium Silicalite-2 Prepared by Direct Hydrothermal Synthesis and Impregnation

Zhao, Xinqing; Wang, Xiaolai

doi:10.1007/s10562-010-0292-5

Cited by 12 publications

(6 citation statements)

References 28 publications

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“…Unlike ZSM-5 (MFI topology) with both straight and sinusoidal micropores, ZSM-11 only has straight channels. ZSM-11 has many applications in the aromatization and isomerization of 1-hexene [60][61][62], cracking of pentenes to C 2 -C 4 olefins [63,64], conversion of methanol to hydrocarbons [61,65,66], alkylation of benzene [67,68], and dehydrogenation of alkanes [69,70]. ZSM-11-based catalysts often show better performance than ZSM-5-based catalysts.…”

Section: Introductionmentioning

confidence: 99%

Catalytic decomposition of N2O over Fe-ZSM-11 catalysts prepared by different methods: Nature of active Fe species

Xie

Luo

Ma³

et al. 2015

Journal of Catalysis

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Section: Introductionmentioning

confidence: 99%

Catalytic decomposition of N2O over Fe-ZSM-11 catalysts prepared by different methods: Nature of active Fe species

Xie

Luo

Ma³

et al. 2015

Journal of Catalysis

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“…Figure 1 showed the powder X-ray diffraction patterns for various MEL zeolite samples; it was observed that all the synthesized samples exhibited the characteristic peaks (such as 2θ = 7.9, 8.8, 14.8, 23.1, and 23.9 ) of an MEL topologic framework, 23,24 indicating that the MEL zeolites were successfully fabricated in the present work. No other detectable diffraction peaks for metal phases, such as large iron oxides, were found, which indicated a substantial absence of large metal crystallites.…”

Section: Characterization Of Zeolitesmentioning

confidence: 77%

Integrating pore interconnectivity and adaptability in a single crystal hierarchical zeolite for liquid alkylation

et al. 2021

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Zeolite belongs to one of the most important families of solid acid catalysts in chemical industries. It is, however, severely constrained by the diffusion limitation for bulky molecules, a lack of multifunctionality for sequential reactions and pore adaptability toward specific adsorbates due to its small micropore size and simple aluminosilicate framework. Introducing mesopores into a zeolite toward realizing hierarchical zeolites is a prevailing strategy but one that usually suffers from compromised crystallinity as well as insufficient interconnectivity and openness of the mesopores. Herein, a novel acid-redox co-functionalized single-crystalline zeolite with highly open and interconnected mesopores is designed and fabricated. As a proof-of-concept study, we integrate solid acid and Fe-oxy redox sites into a hierarchical MEL zeolite with wellcharacterized microporosity and mesoporosity. This zeolite exhibits superior activity and stability toward alkylation between mesitylene with benzyl alcohol, arising from greatly facilitated intra-crystal molecular diffusion, mitigated metal leaching and optimized adsorbate-pore wall interactions.

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“…Cr-Si-2 molecular sieve catalyst with 1.28 wt% chromium gave 45.5% ethylene yield with a selectivity of 87.9% at 650°C. The change of Cr from a higher oxidation state to lower oxidation state was found to influence the catalyst behavior [12]. The ODH of ethane with CO 2 was successfully carried out over the Cr-based catalysts prepared by using FeCrAl alloy foil as support [13] [19].…”

Section: Catalytic Activitymentioning

confidence: 99%

“…5-8 wt% Cr 2 O 3 /SiO 2 catalysts have exhibited excellent performance [6,11]. However, the aggregation of CrO x on SiO 2 is found to negatively influence the catalyst behavior, particularly during the reaction on Cr-Si-2 molecular sieve catalyst [12]. SBA-15 is later found to be a convenient support to overcome the problem of aggregation [13].…”

Section: Introductionmentioning

confidence: 99%

Oxidative dehydrogenation of ethane with carbon dioxide over Cr2O3/SBA-15 catalysts: the influence of sulfate modification of the support

et al. 2017

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Unmodified and sulfate-modified SBA-15-supported Cr 2 O 3 catalysts were prepared by impregnation method. The physico-chemical properties of the supports and catalysts were determined by nitrogen adsorption/ desorption, powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), laser-Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), UV-Vis diffuse reflectance spectroscopy (UV-DRS), inductively coupled plasma optical emission spectroscopy (ICP-OES), transmission electron microscopy (TEM) and temperature-programmed reduction (TPR) techniques. Oxidative dehydrogenation of ethane to ethylene (ODE) with CO 2 as oxidant was carried out on these catalysts in a fixed-bed reactor at temperatures in the range of 600-700°C and at atmospheric pressure. The changes in structural and textural properties because of sulfate modification were identified. Sulfate modification affected the nature of interaction of CrO x species with the SBA-15 support. During the evaluation, it was observed that sulfate modification enhances ethane conversion and ethylene selectivity of the catalyst. Better dispersion of CrO x and the increase in Cr 6? /Cr 3? ratio seem to be the reasons for the higher performance of the sulfate-modified catalysts compared to that of the unmodified catalyst.

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Characterizations and Catalytic Properties of Chromium Silicalite-2 Prepared by Direct Hydrothermal Synthesis and Impregnation

Cited by 12 publications

References 28 publications

Catalytic decomposition of N2O over Fe-ZSM-11 catalysts prepared by different methods: Nature of active Fe species

Catalytic decomposition of N2O over Fe-ZSM-11 catalysts prepared by different methods: Nature of active Fe species

Integrating pore interconnectivity and adaptability in a single crystal hierarchical zeolite for liquid alkylation

Oxidative dehydrogenation of ethane with carbon dioxide over Cr2O3/SBA-15 catalysts: the influence of sulfate modification of the support

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