Epoxidation of Linear Olefins over Stacked TS-1 Zeolite Catalysts

Abstract

Stacked TS-1 [NSTS-1(MW)] has been prepared by microwave synthesis and applied to the epoxidation of linear olefins with H 2 O 2 under mild conditions, and the epoxidation activities were compared with the non-stacked TS-1 and the conventional TS-1, which were also synthesized by microwave and by typical hydrothermal method, respectively. Stacking of TS-1 crystals was accomplished by using microwave which facilitated the dehydration of hydroxyl groups on the external surface of crystallites through the selective absorption of microwave onto Ti species. The stacked crystallites seemed to allow the running pore structure in the b-axis orientation through the crystallites in the stacked morphology. Besides this unique pore structure, the stacked TS-1 showed peculiar features like higher hydrophobicity and enhanced catalytic property than typical TS-1. Moreover, the NSTS-1(MW) showed the highest activity in the epoxidation of linear olefins among three catalysts, and also coincided with the differences in the adsorption of linear aliphatics due to strong interaction with the straight channel in the stacked morphology, which gave larger Henry's constants, obtained by the tracer chromatographic analysis, as the increase in the carbon chain length.

Aromatic Transformations Over Mesoporous ZSM-5: Advantages and Disadvantages

“…Zeolites are the most important industrial catalysts with increasing number of applications ranging from cracking and petrochemistry up to environmental catalysis and fine chemical synthesis [1][2][3][4]. Their importance stems from their microporous properties and controlled acidity having most of the acid sites located inside the zeolite channels.…”

Polymer‐Based Spherical Activated Carbons in Combination with TS‐1 as Efficient Epoxidation Catalysts

“…The synthesis of TS‐1 was carried out according to Jin et al 17. In addition, the crystallization of TS‐1 was performed in the presence of PBSAC ( S BET = 1748 m 2 g −1 , V total = 2.0 cm 3 g −1 , d particle = 0.45–0.50 mm, Blücher GmbH).…”

“…Besides increasing the catalyst porosity, another approach relies on the increase of the TS‐1 hydrophobicity 17. This was achieved, e.g., by increasing the condensation degree of the TS‐1 hydroxyl groups in a microwave‐assisted synthesis with respect to the conventional hydrothermal synthesis.…”

Preparation of magnetic zeolite γ-Fe 2 O 3 /TS-1 with core/shell structure and application in photocatalytic degradation

“…As is well-known, titanium silicate TS-1, considered as a milestone in the development of zeolite and heterogeneous catalyst, has been widely used in a great number of industrially important oxidative reactions using aqueous H 2 O 2 as an oxidizing agent under mild conditions. The reactions catalyzed using TS-1 include alkene epoxidation, phenol oxidation, ketone ammoximation, the conversion of alkanes to alcohols and ketones, as well as secondary alcohols to ketones [29][30][31][32]. In addition, the zeolite is suited to incorporate photoactive guests to form photocatalysts [33].…”