Conversion of aliphatic C1C2 alcohols on In, Nb, Mo-doped complex lithium phosphates and HZr2(PO4)3 with NASICON-type structure

• Published in: Journal of alloys and compounds Vol. 748; pp. 583 - 590
• Main Authors: Ilin, A.B., Ermilova, M.M., Orekhova, N.V., Cretin, M., Yaroslavtsev, A.B.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 05.06.2018
• Subjects: Ethanol conversion; Heterogeneous catalysis; Methanol conversion; Nasicon; Heterogeneous catalysis; Nasicon; Methanol conversion; Ethanol conversion
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2018.03.099

In, Nb, Mo-doped lithium complex phosphates and HZr2(PO4)3 with NASICON-type structure were synthesized in this paper. Particle size distribution lies between 50 and 300 nm. The obtained samples were characterized by X-ray diffraction analysis, scanning electron microscopy and X-ray microanalysis. Investigation of the catalytic properties of synthesized compounds in the C1C2 alcohols conversions showed that heterovalent doping has a determining effect on the obtained catalysts' activity and selectivity. It is shown that the thermodynamic factors and the dopant ability to change the degree of oxidation and acid function of the catalysts play a key role in methanol and ethanol conversion. A number of catalysts show the high activity and selectivity of the formation of dimethyl and diethyl ethers and ethylene. High selectivity for C4 hydrocarbons is achieved by LiZr2(PO4)3 and Li0.5Zr2P2.5Mo0.5O12 catalysts (64 and 49%, respectively) in the case of ethanol conversion. [Display omitted] •Double zirconium phosphates with NASICON structure are catalysts of alcohols conversion.•Zr substitution by In and P by Mo result in the increase in dehydrogenation activity.•Zr substitution by Nb result in the increase in dehydration activity.•HZr2(PO4)3 and Li0.5Zr1.5Nb0.5(PO4)3 have the highest activity in ethers formation.•LiZr2(PO4)3 and Li0.5Zr2P2.5Mo0.5O12 are most active in C4-hydrocarbons formation.