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• W3026251857 abstract "Manipulation of zeolite composition through judicious choice of an organic structure-directing agent (OSDA) is essential to regulate its physicochemical properties. ZSM-48 is a unidimensional zeolite that often crystallizes into siliceous form, and direct synthesis of the aluminous counterpart using low-cost OSDAs is thus far a bottleneck that has obstructed its deployment in large-scale implementation. This work shows the use of a specific OSDA, allyltrimethylammonium chloride, which structurally mimics the iso-alkyl carbenium ion intermediate found in n-heptane skeletal isomerization, is capable of producing aluminous ZSM-48 with more accessible protonic sites. The specificity of this OSDA is ascribed to the good match of its molecular size and shape to the microchannel geometry of the structure and its rigidity endowed by the presence of the CH═CH2 moiety. The obtained material (a Si/Al ratio of ca. 23.0) possesses more medium-to-strong Bronsted acid sites (by a factor of 1.36) and enhanced diffusion property (12 times) with respect to a control sample (Si/Al of ca. 26.7) derived from an expensive, often used OSDA, pentamethonium bromide, as evidenced by NH3-IR spectroscopy and gravimetric adsorption uptake measurement using 2-methylhexane as a probe molecule, respectively. The difference in acid site density between the two samples can be ascribed to the influences of OSDA on crystallinity, amount of Al incorporation, and associated Al sitting. A significant increase in isomer yield from 44 to 72% in n-heptane hydroisomerization has been attained using the obtained ZSM-48 as an acid catalyst with respect to the control sample." @default.
• W3026251857 created "2020-05-29" @default.
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• W3026251857 date "2020-05-22" @default.
• W3026251857 modified "2023-10-06" @default.
• W3026251857 title "Aluminous ZSM-48 Zeolite Synthesis Using a Hydroisomerization Intermediate Mimicking Allyltrimethylammonium Chloride as a Structure-Directing Agent" @default.
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• W3026251857 doi "https://doi.org/10.1021/acs.iecr.0c00750" @default.
• W3026251857 hasPublicationYear "2020" @default.
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