NI-AL MIXED OXIDES AS CATALYSTS IN THE REACTIONS OF CONVERSION OF THE HIGHER ALKANES

• Published in: International Multidisciplinary Scientific GeoConference : SGEM Vol. 18; no. 1.4; pp. 657 - 664
• Main Authors: Shinkarev, Alexey A, Sitdikova, Lyalya M, Valieva, Gulnaz R, Gorelysheva, Valeria E, Petrov, Sergey M
• Format: Conference Proceeding
• Language: English
• Published: Sofia Surveying Geology & Mining Ecology Management (SGEM) 01.01.2018
• Subjects: Alkanes; Aluminum; Analytical methods; Anions; Atoms & subatomic particles; Carbon 14; Carbon isotopes; Catalysis; Catalysts; Catalytic activity; Catalytic cracking; Cations; Chromatography; Composition; Conversion; Coprecipitation; Crystallites; Crystals; Heavy metals; Hydrocarbons; Hydroxides; Infrared spectroscopy; Interlayers; Iodine; Metal ions; Mixed oxides; Nickel; Oxides; Reaction products; Spectroscopy; Spectrum analysis; X-ray diffraction; X-ray diffraction analysis
• ISSN: 1314-2704
• DOI: 10.5593/sgem2018/1.4/S06.086

In this study, investigation of the composition, structure and catalytic activity of the catalyst support based on Ni-Al mixed oxides was carried out. The possibility of controlling structural and acid-base properties of the layered double hydroxides (LDH) by varying the ratio of M2+/M3+ metal cations determines its use as catalyst support. Besides varying of anions in the interlayer space allows to regulate catalytic system activity in the reaction medium. The Ni-Al LDH support was prepared by coprecipitation method followed by conversion to Ni-Al mixed oxide in the reaction medium. According to the X-ray diffraction analysis, it was shown that the Ni-Al-based mixed oxide obtained with a specific surface area of 158 m2/g contains nickel oxide with a reduced lattice parameter related with the replacement of part of Ni2+ cations with Al3+, phase of mixed oxides of variable composition and amorphous phase. The replacement of Ni2+ by Al3+ in nickel positions is 16%. The crystallite size of the obtained oxide phases is 4 nm. The catalytic activity of Ni-Al mixed oxide was determined in the reactions of the conversion of higher alkanes of the C11-C22 composition, taken in equal proportions, at a temperature of 500°C and a feed to catalyst ratio of 30. According to the chromatographic analysis, alkanes and isoalkanes of composition C7-C14 were formed as catalytic products. Unsaturated compounds in the reaction products were revealed by IR spectroscopy method; the iodine value was 0.172.