Résumé
A procedure for the preparation of low-density silica described in a patent filed in 1969 [V. Chiola, J.E. Ritsko, C.D. Vanderpool, US Patent 3 556 725, 1971] leads to the formation of solids having all the properties of MCM-41, the ordered mesoporous silica disclosed in 1991 [J.S. Beck, C.T.-W. Chu, I.D. Johnson, C.T. Kresge, M.E. Leonowicz, W.J. Roth, J.W. Vartuli, WO Patent 91/11390, 1991].