ENVIRONMENT OF PLATINUM ATOMS IN A H2 PtCl6/Al2O3 CATALYST : INFLUENCE OF METAL LOADING AND CHLORINE CONTENT J. BERDALA, E. FREUND et J.P. LYNCH J. Phys. Colloques, 47 C8 (1986) C8-269-C8-272 DOI: 10.1051/jphyscol:1986850