Gj. Hutchings et al., REACTIVATION OF BORON PHOSPHATE CATALYSTS FOR THE SYNTHESIS OF ISOPRENE FROM 2-METHYLBUTANAL DEHYDRATION, Journal of the Chemical Society, Chemical Communications, (23), 1994, pp. 2717-2718
Boron phosphate catalysts, when used for the title reaction, are deact
ivated both by coke deposition and by loss of surface phosphorus; air
reactivation at 800 degrees C is shown to totally restore the catalyst
structure and performance.