A Study of Platinum Catalysts Based on Ordered Al–МСМ-41 Aluminosilicate and Natural Halloysite Nanotubes in Xylene Isomerization

• Published in: Petroleum chemistry Vol. 59; no. 11; pp. 1226 - 1234
• Main Authors: Glotov, A. P., Artemova, M. I., Demikhova, N. R., Smirnova, E. M., Ivanov, E. V., Gushchin, P. A., Egazar’yants, S. V., Vinokurov, V. A.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.11.2019; Springer Nature B.V
• Subjects: Aluminosilicates; Aluminum oxide; Aluminum silicates; Ammonia; Catalysts; Chemical synthesis; Chemistry; Chemistry and Materials Science; Composite materials; Conversion; Ethylbenzene; Industrial Chemistry/Chemical Engineering; Isomerization; Low temperature; Nanotubes; Platinum; Reforming; Selectivity; Weight; X ray fluorescence analysis; Xylene; xylene; MCM-41; aluminosilicates; isomerization; halloysite; mesoporous materials
• ISSN: 0965-5441; 1555-6239
• DOI: 10.1134/S0965544119110033

Hierarchical composite materials based on ordered aluminosilicates of the Al–MCM-41 type and halloysite nanotubes (HNTs) with different Al–MCM-41/halloysite weight ratios have been synthesized and studied as components of supports of platinum catalysts for the isomerization of the C 8 aromatic fraction of reforming. At each synthesis stage, the materials have been characterized by transmission electron microscopy (TEM), low-temperature nitrogen adsorption, X-ray fluorescence analysis, X-ray diffraction (XRD) analysis, and temperature-programmed desorption of ammonia (NH 3 -TPD). Catalyst systems with an Al–MCM-41/HNT weight ratio of 90 : 10 wt % have shown the highest efficiency in xylene isomerization providing a higher conversion of ethylbenzene and m -xylene than the conversion provided by the HNT-based catalyst. It has been found that the synthesized catalysts exhibit a higher selectivity for the target product of the process— p -xylene—than the selectivity of a commercial counterpart in a temperature range of 360–440°C. The maximum p -xylene selectivity (70%) has been achieved in the presence of a Pt/Al–MCM-41/HNT(90 : 10)/Al 2 O 3 catalyst at 360°C.