Novel synthesis and catalytic performance of hierarchical MOR

Lu, Jiaxin; Wang, Yaquan; Sun, Chao; Zhao, Taotao; Zhao, Jingjing; Wang, Ziyang; Liu, Wenrong; Wu, Shuhui; Shi, Mingxue; Bu, Lingzhen

doi:10.1039/d1nj00133g

Cited by 6 publications

(6 citation statements)

References 80 publications

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“…1500 nm, which was consistent with the morphology of UiO-67 reported in the literature [48,49]. During the process of crystallization, CTAB was adsorbed on the surface of the UiO-67 primary crystal, which would decrease the van der Waals force and surface energy, promoting the ordered agglomeration, thus forming a more regular morphology [50][51][52]. The long hydrocarbon chains of CTAB also repelled each other, preventing the further interaction with other UiO-67 crystals and excessive growth of UiO-67, resulting in a smaller particle size [53,54].…”

Section: Synthesis and Characterizationsupporting

confidence: 87%

MOF-Derived ZrO2-Supported Bimetallic Pd–Ni Catalyst for Selective Hydrogenation of 1,3-Butadiene

Liu,

Wang

et al. 2024

Molecules

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A series of MOF-derived ZrO2-supported Pd-Ni bimetallic catalysts (PdNi/UiO-67-CTAB(n)-A500) were prepared by co-impregnation and pyrolysis at 500 °C under air atmosphere using UiO-67-CTAB(n) (CTAB: cetyltrimethylammonium bromide; n: the concentration of CTAB; n = 0, 3, 8, 13, 18) as a sacrificial template. The catalytic activity of PdNi/UiO-66-CTAB(n)-A500 in 1,3-butadiene hydrogenation was found to be dependent on the crystal morphology of the UiO-67 template. The highest activity was observed over the PdNi/UiO-67-CTAB(3)-A500 catalyst which was synthesized using UiO-67-CTAB(3) with uniform octahedral morphology as the template for the 1,3-butadiene selective hydrogenation. The 1,3-butadiene conversion and total butene selectivity were 98.4% and 44.8% at 40 °C within 1 h for the PdNi/UiO-67-CTAB(3)-A500 catalyst, respectively. The catalyst of PdNi/UiO-67-CTAB(3)-A500 can be regenerated in flowing N2 at 200 °C. Carbon deposited on the surface of the catalyst was the main reason for its deactivation. This work is valuable for the high-efficiency bimetallic catalyst’s development on the selective hydrogenation of 1,3-butadiene.

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Section: Synthesis and Characterizationsupporting

confidence: 87%

MOF-Derived ZrO2-Supported Bimetallic Pd–Ni Catalyst for Selective Hydrogenation of 1,3-Butadiene

Liu,

Wang

et al. 2024

Molecules

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“…The insets in Figures 2e and 2f show fast Fourier transform (FFT) patterns taken along [110], indicating that nanolayers of MOR‐Cl+CTA and MOR‐OH+CTA are parallel to the c ‐axis [20] . According to previous studies, CTA can cover specific surface planes of the zeolite crystals via the electrostatic interaction, thus preventing crystal growth [14b,f] . During MOR zeolite synthesis, this capping effect can favour preferential crystal growth resulting in the nanostrip morphology [7,21] .…”

Section: Resultsmentioning

confidence: 90%

Synthesis of Nanocrystalline Mordenite Zeolite with Improved Performance in Benzene Alkylation and n‐Paraffins Hydroconversion

Poll

et al. 2022

ChemCatChem

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Nanocrystalline mordenite (MOR) zeolites were hydrothermally synthesized in a single step with commercial cetyltrimethylammonium (CTA) hydroxide as the sole organic template, while the aluminum source was varied in a typical synthesis gel. CTA can effectively reduce the crystal growth of MOR zeolites, in some cases selectively in the a‐ and b‐directions of the unit cell. These nanocrystalline MOR zeolites do not only have a larger external surface area than their bulk counterparts prepared without CTA, but the Brønsted acid sites in the side‐pockets are also more accessible. The combination of the use of CTA and AlCl3 ⋅ 6H2O afforded the best‐performing catalyst with much improved activity in benzene alkylation and hydroconversion of n‐hexadecane (n‐C16). Modifying MOR synthesis with CTA hydroxide is a cheap and effective method to open up the one‐dimensional micropore system of mordenite, increasing the catalytic performance in hydrocarbon reactions.

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“…Adsorbed water and other impurities desorb in this region. The second part ranging from 250 to 350 °C is ascribed to soft coke oxidation . The soft coke is composed of reaction intermediates .…”

Section: Resultsmentioning

confidence: 99%

“…The second part ranging from 250 to 350 °C is ascribed to soft coke oxidation. 63 The soft coke is composed of reaction intermediates. 64 The weight loss ratio in this stage decreases in the following order: MOR-wheel (1.9%) > MOR-spheroid (1.8%) > MOR-bulk (1.3%).…”

Section: Textural and Acidic Propertiesmentioning

confidence: 99%

Wheel-like Mordenite Nanoassemblies with Shortened Channel Lengths for Improved Catalytic Performance in Dimethyl Ether Carbonylation

Liu,

Wang,

et al. 2023

ACS Appl. Nano Mater.

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To achieve a better catalytic performance, it is of great interest to synthesize nanosized zeolites with reduced internal diffusion limitations. Herein, c-axis shortened wheel-like mordenite nanoassemblies were synthesized. The crystal growth along the [001] direction was successfully inhibited with K + cations as structure breaking agents. The wheel-like crystal is 1.5−2 μm in diameter and 200−300 nm in thickness. The growth of such a unique structure underwent a nonclassical crystallization process including the generation of amorphous worm-like particles and formation of wheel-like crystallites followed by a−b plane oriented growth of the crystals. The obtained MOR wheel-like assemblies possessed larger surface area and external surface area, displayed better mass transfer properties, and exhibited much better catalytic performance than MOR spheroid-like assemblies and conventional bulk MOR zeolite in dimethyl ether (DME) carbonylation reaction, with two and a half times higher the conversion of DME than the bulk MOR, although these samples had identical Si/Al ratios and acid properties. This work provides a simple route to control the zeolite morphology by alkali metal cations and brings forward an effective strategy to prepare zeolite materials with improved catalytic performance.

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Novel synthesis and catalytic performance of hierarchical MOR

Abstract: A novel route was developed to synthesize hierarchical MOR through introducing BEA/MOR zeolite embryos as structural growth inducer (SGI) in the presence of hexadecyltrimethylammonium (CTA+). The morphologies, physicochemical properties and...

Cited by 6 publications

References 80 publications

MOF-Derived ZrO2-Supported Bimetallic Pd–Ni Catalyst for Selective Hydrogenation of 1,3-Butadiene

MOF-Derived ZrO2-Supported Bimetallic Pd–Ni Catalyst for Selective Hydrogenation of 1,3-Butadiene

Synthesis of Nanocrystalline Mordenite Zeolite with Improved Performance in Benzene Alkylation and n‐Paraffins Hydroconversion

Wheel-like Mordenite Nanoassemblies with Shortened Channel Lengths for Improved Catalytic Performance in Dimethyl Ether Carbonylation

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