Abstract: The invention concerns a method for preparing organic-inorganic hybrid materials with controlled porosity and functionality, comprising hydrolysis and condensation polymerisation of at least a compound of formula (I): Z—R1—Si(OR)(OR′)(OR″), wherein: Z represents either an atom selected among chlorine, bromine or iodine atoms, or an amino or phosphino group; R, R′ and R″, independently of one another, represent an alkyl radical comprising on to four carbon atoms; R1 represents a divalent radical derived from an aliphatic hydrocarbon chain comprising 1 to 30 carbon atoms, wherein are optionally interspersed one or several arylene; —O—, —S—, —O—C(═O), —N(R6)—C(═O)— or N(R6), with at least an alkaline or alkaline-earth silicate of (II) in a mol ratio (I)/(II)=1/9 in the presence of at least a non-ionic surfactant in micellar concentration, to form a mesoporous silica represented by formula (III): Z—R1&

Abstract: Process for preparing hydrogen peroxide, comprising the following steps: a) a step of reduction of dioxygen in acidic medium with a hydrophobic organometallic complex, and b) a step of separation of the oxidized organometallic complex resulting from step a) and of the hydrogen peroxide by liquid/liquid extraction.