A Novel Liquid-solid Isomorphous Substitution Route for Preparing Zeolite Ti-β

Abstract

Abstract: A novel convenient method, liquid-solid isomorphous substitution(LSIS) of Ti(SO₄)₂, was used to post-synthesize titanium beta(Ti-β) zeolite in this paper. The prepared Ti-β zeolites were characterized by XRD, IR, Raman, UV-Vis, XPS, adsorption of hexane, as well as catalytic testing. Ti-β zeolite prepared from 30% Ti(SO₄)₂ showed good catalytic properties, while excessive usage of Ti(SO₄)₂ rendered an inferior catalyst. The results from Raman, UV-Vis and adsorption of hexane indicate that fewer extra-framework Ti species were formed on these modified samples. The presence of the strong absorption band around 220 nm in UV-Vis spectra and the appearance of the band around 960 cm^-1 in IR spectra demonstrate that the tetrahedrally coordinated Ti-atoms exist in the framework of Ti-containing zeolites. These Ti-β zeolites prepared by LSIS method were active in the epoxidation of olefin with H₂O₂, and the main products are the alcoholysis and hydrolysis product of the epoxide, due to the stronger acidic sites remained on the catalysts. The significantly higher activity can be achieved on these Ti-β zeolites in epoxidation of cyclohexene with respect to conventional TS-1 zeolite.

Key words: Liquid-solid isomorphous substitution, Ti-&beta, zeolite, Titanium sulphate, Epoxidation, H₂O₂

CLC Number:

O614

TrendMD:

ZHOU Wei, CHUN Yuan, XU Qin-Hua, WANG Cheng, DONG Jia-Lu . A Novel Liquid-solid Isomorphous Substitution Route for Preparing Zeolite Ti-β[J]. Chem. J. Chinese Universities, 2004, 25(1): 16.

References

[1] Taramas so M.,Pereg o G.,Not ari B..U S Patent 4 410 501[P],1983 [2] Corma A.,Camblor M.A.,Es t eve P.et al..J.Catal.[J],1994,145:151—158 [3] Wu P.,Tatsumi T.,Komat su T.et al..J.Phys.Ch em.B.[J],2001,105:2 897—2 905 [4] Camblor M.A.,Corm a A.,Mart inesz A.et al..Chem.Commun.[J],1992:589—590 [5] Tatsumi T.,Jappar N..J.Phys.Ch em.B.[J],1998,102:7 126—7 131 [6] Wu P.,Komat su T.,Yashim a T..J.Catal.[J],1997,168:400—411 [7] Tuel A..Zeol it es[J],1995,15:228—235 [8] Diaz-Cabanas M.,Vil lacscusa L.A.,Camblor M.A..Ch em.Commu n.[J],2000:761—762 [9] Men g X.,Li D.,Yang X.et al..J.Phys.Chem.B[J],2003,107:8 972—8 980 [10] Bu J.,Rhee H.K..Catal.Lett.[J],2000,65:141—145 [11] Schmidt I.,Krogh A.,Wienberg K.et al..Chem.Commun.[J],2000:2 157—2 158 [12] Figuer as F.,Kochkar H.,Caldarelli S..Micr op.Mesop.Mat er.[J],2000,39:249—256 [13] Krijnem S.,San chez P.,Jakobs B.T.F.et al..Microp.Mesop.Mat.[J],1999,31:163—173 [14] Ogura M.,Nakat a S.,Kik uch i E.et al..J.Cat al.[J],2001,199:41—47 [15] Krau shaar B.,Van Hooff J.H.C..Cat al.Let t.[J],1988:81—84 [16] Nur H.,Ikeda S.,Oht ani B..J.Cat al.[J],2001,204:402—408 [17] Mill ini R.,Previdi Massara E.,Per ego G..J.Catal.[J],1992,137:497—503 [18] Chun Y.,Chen X.,Yan A.Z.et al..St ud.Surf.Sci.Cat al.[J],1994,84:1 035—1 042 [19] Blasco T.,Camblor M.A.,Corma A.et al..J.Phys.Chem.B[J],1998,102:75—88 [20] Klaas J.,Schul z-Ekl of f G.,Jaeger N.I..J.Ph ys.Chem.B[J],1997,101:1 305—1 311 [21] Vays sil ov G.N..Catal.Rev.-Sci.Eng.[J],1997,39(3):209—251 [22] Scarano D.,Zecch ina A.,Bor diga S.et al..J.Ch em.Soc.,Faraday Trans.[J],1993,89:4 123—4 130 [23] Camblor M.A.,Corm a A.,Pet ez-Parien te J..J.Ch em.Soc.,Ch em.Commu n.[J],1993:557—559 [24] Andrzej G.D.,Turek M.,Wachs I.E.et al..Zeol it es[J],1993,13:365—373 [25] Ricchiardi G.,Dam in A.,Bordiga S.et al..J.Am.Ch em.Soc.[J],2001,123:11 409—11 419