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Synthesis and catalytic properties of titanium containing extra-large pore zeolite CIT-5

Paper ID Volume ID Publish Year Pages File Format Full-Text
54162 46999 2014 7 PDF Available
Title
Synthesis and catalytic properties of titanium containing extra-large pore zeolite CIT-5
Abstract

•Ti-CIT-5, a new extra-large pore titanosilicate was prepared and characterized.•The lowest Si/Ti ratio in prepared material is 23.•Ti-CIT-5 is active catalyst in epoxidation of olefins with H2O2.

Titanium containing extra-large pore zeolite CIT-5 (IZA code: CFI) was successfully prepared by direct synthesis using Cab-O-Sil M5 and titanium(IV) butoxide in the presence of LiOH. N-Methylsparteinium hydroxide was used as a structure directing agent. The product crystallized into thin plate crystals with an approximate size of 20 × 5 × 0.2 μm. The lowest achieved Si/Ti ratio was 23. The necessary duration of hydrothermal synthesis increased with increasing concentration of Ti in the reaction mixture from 11 days (Si/Ti = 63 in product) to 17 days (Si/Ti = 36) at 155 °C. Prepared Ti-CFI samples exhibit BET surface areas in the range of 308–346 m2/g and micropore volumes of 0.094–0.097 cm3/g. CFI possesses extra-large pores (14-ring, 7.2 × 7.5 Å) accessible for bulky molecules, therefore, Ti-CFI is a useful catalyst for epoxidation of double bonds in bulky molecules used in perfumery and pharmacy. The Ti-CFI samples proved to be catalytically active in epoxidation of 1-octene, cyclooctene, α-pinene, and norbornene with hydrogen peroxide as oxidation agent.

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Keywords
Zeolite CIT-5; Titanosilicate; Epoxidation; Catalysis; Norbornene; α-Pinene
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 227, 15 May 2014, Pages 80–86
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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Price was $35.95
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Price after discount Only $4.95
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