Synthesis and application of Pt-containing catalysts based on mordenite zeolite and natural halloysite nanotubes in the gas-phase isomerization of C-8 aromatic fraction

Synthesis and application of Pt-containing catalysts based on mordenite zeolite and natural halloysite nanotubes in the gas-phase isomerization of C-8 aromatic fraction

[Display omitted] •A novel approach for MOR zeolite synthesis from halloysite nanotubes was proposed.•Halloysite clay acts both as a hard template for mesopores formation and Si/Al source.•Pt-catalysts based in hierarchical MOR were investigated in C-8 cut isomerization. The MOR-type zeolite was syn...

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Bibliographic Details
Published in:Chemical engineering journal (Lausanne, Switzerland : 1996) Vol. 476; p. 146597
Main Authors: Kireev, G.A., Demikhova, N.R., Rubtsova, M.I., Smirnova, E.M., Reshetina, M.V., Stytsenko, V.D., Vinokurov, V.A., Glotov, A.P.
Format: Journal Article
Language:English
Published: Elsevier B.V 15-11-2023
Subjects:
Halloysite nanotubes
Micro-mesoporous materials
Mordenite zeolite
P-xylene
Template-free synthesis
Xylene isomerization
P-xylene
Micro-mesoporous materials
Template-free synthesis
Halloysite nanotubes
Xylene isomerization
Mordenite zeolite
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Summary:[Display omitted] •A novel approach for MOR zeolite synthesis from halloysite nanotubes was proposed.•Halloysite clay acts both as a hard template for mesopores formation and Si/Al source.•Pt-catalysts based in hierarchical MOR were investigated in C-8 cut isomerization. The MOR-type zeolite was synthesized by a template-free method using natural aluminosilicate halloysite nanotubes (HNT) as a hard template and a source of aluminum and silicon. Samples were studied using a complex of physicochemical methods of analysis: XRD, TEM, N2 physisorption, NH3-TPD and XRF. Specific BET surface area of MOR prepared using HNT is 306 m2/g, mesopores in the MOR:HNT accounted for 30 % of the total pore volume. Based on the synthesized materials (MOR, MOR:HNT and MOR + HNT), Pt-containing catalysts were prepared. The catalysts were investigated in the gas-phase isomerization of C-8 aromatic fraction in a temperature range of 360–420 °C, varying LHSV from 2 to 6 h−1, at H2 pressure of 1 MPa and hydrogen/feedstock volume ratio of 900 nl/l. The prepared catalysts demonstrated strong activity in ethylbenzene transformation (more than 95 %), while providing a high yield of p-xylene (more than 95 % of thermodynamic value).
ISSN:1385-8947
1873-3212
DOI:10.1016/j.cej.2023.146597