Catalyst for prepn. of p-dihydroxybenzene phenol direct oxidation

A catalyst for preparing hydroquinone from phenol by direct oxidation is an HZSM-5 molecular sieve improved by La with high Si/Al ratio higher than 500, and prepared through immersing pretreated HZSM-5 molecular sieve in solution of compound containing La as active component, drying and calcine. Its advantages include high transform rate of dental gas and selectivity to hydroquinone, low burning-start temp and long service life.