Rare earth-containing high-silica zeolite having penta-sil type structure and process for the same
AssigneesResearch Institute of Petroleum Processing, China Petrochemical Corporation
InventorsXingtian Shu, Wei Fu, Mingyuan He, Meng Zhou, Zhicheng Shi, Shugin Zhang
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Abstract
The present invention discloses a rare earth-containing high-silica zeolite having penta-sil type structure and process for the same. The anhydrous composition of the high-silica zeolite of the present invention (based on the mole ratio of oxides) can be defined by the formula xRE.sub.2 O.sub.3 yNa.sub.2 OAl.sub.2 O.sub.3 zSiO.sub.2 in which X=0.01-0.30, y=0.4-1.0, and z=20-60. The high-silica zeolite of the present invention is an useful active component for catalysts.
Claims13
A synthetic crystalline aluminosilicate zeolite having an anhydrous chemical composition (based on moles of oxides) of formula:
- xRE.sub.2 O.sub.3 yNa.sub.2 OAl.sub.2 O.sub.3 zSIO.sub.2
- wherein
- x=0.01-0.30, y=0.4-1.0, z=20-60;
- said zeolite having the structure of a pentasil and a X-ray diffraction pattern listed in Table 1, and its normal hexane adsorption/cyclohexane adsorption ratio being 2-4 times higher than that of H-ZSM-5 zeolite.
A process for synthesizing a crystalline aluminosilicate zeolite having an anhydrous chemical composition based on moles of oxides of the formula:
- xRE.sub.2 O.sub.3 yNa.sub.2 OAl.sub.2 O.sub.3 zSIO.sub.2
- wherein
- x=0.01-0.30, y=0.4-1.0, z=20-60,
- said zeolite having the structure of a pentasil and an X-ray diffraction pattern listed in Table 1, and its normal hexane adsorption/cyclohexane adsorption ratio being 2-4 times higher than that of H-ZSM-5 zeolite, said process comprising the steps of dispersing rare earth-containing faujasite seed in a gel system comprising water glass, aluminum salt, inorganic acid and water, with oxide mole ratio SiO.sub.2 /Al.sub.2 O.sub.3 =30-120, Na.sub.2 O/Al.sub.2 O.sub.3 =2-15, and H.sub.2 O/SiO.sub.2 =20-100 and crystallizing at a temperature of 130.degree.-200.degree. C. for 12-60 hours followed by filtrating, washing, and drying.
Dependencies are inferred from the claim text.