Abstract
The relationship of the structural organization and acid-base properties of the surface of phosphorus titanate oxides prepared from tetra-n-butoxytitanium and phosphorous esters with the catalytic activity and selectivity of these materials in ethylene glycol oxyethylation was studied. Single-phase phosphorus-containing oxides synthesized from 2-diethylamido-4-methyl-1,3,2-dioxophosphorinane and diphenyl(methano)phosphocane have strong surface aprotic acid sites and exhibit high catalytic activity with respect to oxyethylation and a record-breaking selectivity in the formation of the lower homolog, diethylene glycol. The last-mentioned fact is a consequence of the sieve effect exerted by the homogeneous porous structure of supermicropores (8—10 Å) of the oxides. An increase in the concentration of the strong acid sites (≥130 kJ mol–1) on the oxide surface enhances the catalytic activity. On the basis of the temperature programmed desorption of ammonia and CO2 and kinetic measurements, a concerted acid-base mechanism was proposed for the catalytic addition of ethylene oxide to ethylene glycol on the phosphorus-titanate surface.
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Kozlovskii, R.A., Yushchenko, V.V., Kitaev, L.E. et al. Structural organization of phosphorus titanate oxides prepared by the alkoxo method and their catalytic activity in ethylene glycol oxyethylation. Russian Chemical Bulletin 51, 967–974 (2002). https://doi.org/10.1023/A:1019601332563
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DOI: https://doi.org/10.1023/A:1019601332563