ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Chemical characteristics and crystallographic aspects of the vanadyl phosphate catalyst prepared in the medium of hydrochloric acid

M. Brutovský and Š. Gerej

Department of Physical and Analytical Chemistry, Faculty of Natural Sciences, P. J. Šafárik University, CS-04154 Košice

Abstract: An active catalyst of partial oxidation of the C4 fraction of hydrocarbons to maléic anhydride arises by forming and activating the precursor of the vanadyl phosphate catalyst, in our case vanadyl hydrogen phosphate. This catalyst crystallizes in the rhombic system, the volume of unit cell being by about 30 % smaller than that one of vanadyl hydrogen phosphate. From the chemical point of view, the known phase of vanadyl diphosphate, i.e. (VO)₂P₂0₇ is the basic component. The analysis of infrared spectra of the catalyst indicates the presence of a new phase, cyclic vanadyl tetraphosphate (VO)₂P₄0₁₂ as well. The method of formation and activation affects chemical and structural characteristics of the resulting stabilized V—P—О catalyst at equal composition expressed by the ratio n(Р):n(V).

Full paper in Portable Document Format: 425a595.pdf

Chemical Papers 42 (5) 595–600 (1988)