Porous clay inclusion cpd. - comprises layers of laminar clay, inorganic supports and hydrogen ions in the pores formed by the supports, used as acid catalyst for cracking hydrocarbon(s)

摘要

Porous clay inclusion cpd. (I) has a series of layers of a laminar clay (II), inorg. supports (III) between the layers, which form pores and surface sections, and H ions, fixed in the pores and to the surface sections. (II) is a phyllosilicate with ion exchange properties, pref. montmorillonite, beidellite, hectorite, saponite, nontronite, vermiculite and/or artificial fluorinated mica. (III) consist of an inorg. oxide, i.e. Al2O3, ZrO2, Cr2O3, Bi2O3, SiO2, TiO2 and/or Fe2O3. (I) is produced by (a) mixing (II), having cations between the layers, with a soln. contg. (III) precursor ions (IIIA) to replace pt. of the cations with (IIIA); (b) heat treatment of the ion exchanged (II) at 100-900deg.C to produce a porous clay inclusion cpd. (IV); (c) mixing (IV) with an aq. soln. of an ammonium salt (V) to exchange any remaining cations with ammonium ions; and (d) heating the treated (IV) at 200-900 deg.C to desorb NH3 and absorb H ions in the pores and surface sections. USE/ADVANTAGE - (I) is claimed for use as hydrocarbon cracking catalyst. It is also useful in absorbents, air purifiers etc. The H ions give high catalytic activity, whilst the uniform pore structure gives shape selectivity properties.