PROCESS FOR SUPPORTING CATALYST METAL FOR PROMPTING REDUCING REACTION ON PHOTOREACTIVE SEMICONDUCTOR

摘要

PURPOSE:To obtain long life of catalytic activity by forming Pd or Ag on the surface of a photoreactive semiconductor and allowing catalyst metal for prompting reducing reaction to deposit around nuclei of Pd or Ag. CONSTITUTION:A photoreactive semiconductor is dipped in aq. soln. contg. Pd ion or Ag ion and reducing agent for said ion and the impregnated material is reduced thermally to cause deposition of Pd or Ag on the surface. It is further dipped in aq. soln. contg. ion of catalyst metal for prompting reducing reaction and its reducing agent to cause uniform and firm deposition of the catalyst metal for prompting reducing reaction on the surface of the photoreactive semiconductor around Pd or as nuclei.