Phosphates Cr_xTi_2x(PO₄)₃: Synthesis, Structure,
and Catalytic Properties

V. I. Pet’kov^a, I. A. Shchelokov^a, V. S. Kurazhkovskaya^b, N. V. Orekhova^c,
M. M. Ermilova^c, and G. F. Tereshchenko^c

^a Nizhni Novgorod State University, pr. Gagarina 23, Nizhni Novgorod, 603950 Russia

^b Moscow State University, Vorob’evy gory, Moscow, 119992 Russia

^c Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Leninskii pr. 29, Moscow, 119991 Russia

e-mail: petkov@uic.nnov.ru

Received August 14, 2007

Abstract—Complex phosphates of titanium, chromium, and metals(2+) of the general formula M_{0.5(1 + x)}Cr_xTi_2x(PO₄)₃
(M = Mg, Ca, Mn, Ni, Sr, Ba, and Pb) were synthesized. Their phase formation was studied by means of X-ray
powder diffraction, electron probe microanalysis, differential thermal analysis, and IR spectroscopy. Individual
phases and solid solutions crystallizing in kosnarite and langbeinite structure types were identified; their crys-
tallographic parameters were calculated. The catalytic properties of phosphates Ca_{0.5(1 + x)}Cr_xTi_2x(PO₄)₃ in
methanol conversion were studied.

DOI: 10.1134/S0036023608070036

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