E. I. Du Pont de Nemours and Company (Wilmington DE 02)
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초록▼
An amorphous aluminosilicate sol with uniform size particles and a porous amorphous aluminosilicate powder composition useful as a catalyst in petroleum cracking is prepared by a process comprising (1) preparing a sol of discrete colloidal particles of uniform size within the range of from 2 to 87 n
An amorphous aluminosilicate sol with uniform size particles and a porous amorphous aluminosilicate powder composition useful as a catalyst in petroleum cracking is prepared by a process comprising (1) preparing a sol of discrete colloidal particles of uniform size within the range of from 2 to 87 nanometers, the surface of the particles consisting of a coating of an aluminosilicate at least 0.5 nanometer in thickness, by separately and simultaneously adding a sol of silica or a solution of sodium or potassium silicate and a solution of sodium or potassium aluminate to a heel sol of uniform-sized colloidal particles of aluminosilicate, silica, or one or more refractory metal oxides at a certain rate of addition and at a constant pH in the range of 9 to 12 and a temperature of 50°to 100°C. to deposit or coat aluminosilicate onto the surface of the heel sol particles, (2) ion exchanging the sodium or potassium ions of the sol from (1) for ammonium ions, (3) optionally removing the ammonium ions partially or completely with one or more metal ions described herein selected from Groups I to VIII of the Periodic Table, and (4) removing water from the sol without gelling so that the particles become uniformly packed into aggregates having pores of substantially uniform size and coating said powder with a surface layer 0 to 15% by weight of a metal or metal oxide, said powder having a specific surface area of 30 to 750 m2/g, a bulk density of 0.5 g/cc or more and substantially uniform size pore diameters of from 20 A to 250 A, with pore diameters of 20 A to 45 A having a uniformity such that at least 90% of the pore volume is made up of pores of from 0.6 D to 1.4 D and pore diameters of 45 A to 250 A having a uniformity such that at least 80% of the pore volume is made up of pores of from 0.6 D to 1.4 D, where D is the median pore diameter.
대표청구항▼
A porous powder composition comprising porous aggregates of spheroidal particles of from 3 to 90 nanometers which particles are nonporous to nitrogen and contain: (a) a core of silica, aluminosilicate or one or more refractory metal oxides selected from alumina, zirconia, titania, thoria and rare ea
A porous powder composition comprising porous aggregates of spheroidal particles of from 3 to 90 nanometers which particles are nonporous to nitrogen and contain: (a) a core of silica, aluminosilicate or one or more refractory metal oxides selected from alumina, zirconia, titania, thoria and rare earth oxides; (b) a coating around said core of at least 0.5 nanometer in depth of an amorphous hydrous aluminosilicate compound having a molar ratio of Si:Al of from 1:1 to 19:1 and comprising one or more cations selected from sodium, potassium, ammonium, hydrogen and Groups I to VIII metals selected from Cs, Li, Mg, Ca, Sr, Ba, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag, La, Ce, rare earth metals, Hf, Ta, W, Re, Os, Ir, Pt, Au, Sn, Cd, Bi and Sb; and (c) a surface layer over said coating of 0 to 15% by weight of a metal or metal oxide selected from Cs, Li, Mg, Ca, Sr, Ba, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag, La, Ce, rare earth metals, Hf, Ta, W, Re, Os, Ir, Pt, Au, Sn, Cd, Bi and Sb; said powder composition having a specific surface area of 30 to 750 m2/g, a bulk density of 0.5 g/cc or more and substantially uniform size pore diameters of from 20 A to 250 A, with pore diameters of 20 A to 45 A having a uniformity such that at least 90% of the pore volume is made up of pores of from 0.6 D to 1.4 D and pore diameters of 45 A to 250 A having a uniformity such that at least 80% of the pore volume is made up of pores of from 0.6 D to 1.4 D, where D is the median pore diameter. The porous powder composition of claim 1 uniformly mixed with a crystalline aluminosilicate zeolite such that the mixture is 5 to 50% by weight crystalline aluminosilicate zeolite and 95 to 50% by weight of said powder.
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