Epoxidation of propylene with H2O2 catalyzed by supported TS-1 catalyst in a fixed-bed reactor: Experiments and kinetics

Wu, Guoqiang; Wang, Yaquan; Wang, Lina; Feng, Wenping; Shi, Hainan; Lin, Yi; Zhang, Teng; Jin, Xing; Wang, Shuhai; Wu, Xiaoxue; Yao, Pengxu

doi:10.1016/j.cej.2012.11.055

Cited by 81 publications

(70 citation statements)

References 20 publications

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“…2. All the samples exhibit the same morphology of ellipsoids and have similar sizes of about 200 nm, agreeing with those of TS-1 crystals synthesized under the similar conditions in our previous work [29]. The results confirm that the samples treated with TEA do not influence the morphology or crystal size of TS-1.…”

Section: Characterization Of Ts-1 Before and After Tea Treatmentsupporting

confidence: 92%

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Effect of triethylamine treatment of titanium silicalite-1 on propylene epoxidation

Wang

Feng

Lin

et al. 2014

Front. Chem. Sci. Eng.

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Titanium silicalite-1(TS-1) treated with triethylamine (TEA) solution under different conditions was characterized by X-ray powder diffraction (XRD), Fouriertransform infrared spectrum (FTIR), ultraviolet-visible diffuse reflectance spectrum (UV-Vis), nitrogen physical adsorption and desorption, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The characterization results show that many irregular hollows are generated in the TS-1 crystals due to the random dissolution of framework silicon and the volume of the hollow cavities increase with increasing the TEA concentration, and the treatment temperature and time. The modified TS-1 samples improved in varying degrees the catalyst life for the epoxidation of propylene in a fixed-bed reactor probably due to the generation of the hollows to make it easy for the reactants and products to diffuse out of the channels.

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Section: Characterization Of Ts-1 Before and After Tea Treatmentsupporting

confidence: 92%

“…Tetrapropyl ammonium hydroxide was prepared through ionexchange. The preparation of TS-1 (Si/Ti = 70, mole ratio) were described in our previous work [29].…”

Section: Methodsmentioning

confidence: 99%

Effect of triethylamine treatment of titanium silicalite-1 on propylene epoxidation

Wang

Feng

Lin

et al. 2014

Front. Chem. Sci. Eng.

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“…In several liquid-phase epoxidation routes to convert propene into propene oxide, much attention has been directed to heterogeneous catalytic oxidation using hydrogen peroxide as a more environmentally benign and profitable chemical process [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Titanium silicalite (TS-1) catalyst has been extensively investigated for this route because propene oxide can be produced with a high selectivity in methanol under mild conditions [4,5,[10][11][12][13][14][15][16][17][18][19][20][21][22][23]. The direct epoxidation process based on hydrogen peroxide (oxidant) and TS-1 (catalyst) was commercialized and referred to as "hydrogen peroxide-to-propene oxide" (HPPO) process.…”

Section: Introductionmentioning

confidence: 99%

The effects of impregnation of precious metals on the catalytic activity of titanium silicate (TS-1) in epoxidation of propene using hydrogen peroxide

Shin

Lee

Chadwick

2016

Journal of Molecular Catalysis A: Chemical

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Propene oxide is an important chemical intermediate and titanium silicalite (TS-1) has been widely investigated as a promising catalyst for the direct epoxidation of propene with ex-situ or in-situ produced hydrogen peroxide as an oxidant. In order to clarify the effects of the kind of precious metal and treatment process in the catalyst preparation on the propene epoxidation and the hydrogen peroxide decomposition, TS-1 was impregnated with gold and palladium via drying, calcination and reduction and the experiments to check its catalytic performance were conducted in a gas aspirating autoclave reactor in the absence of mass transfer limitations. The presence of precious metals vigorously catalyzed the side reactions and hydrogen peroxide decomposition. Some of the precious metal containing TS-1 catalysts showed high initial rates but there was no catalyst with a propene oxide yield after 5 h reaction time comparable to TS-1 alone because of the enhancement of side reactions by precious metals. The significant decline in the selectivity to propene oxide over the dried precious metal containing TS-1 catalysts was attributed to the leaching of precious metals into the reaction medium. Palladium containing TS-1 showed exceptionally high decomposition of hydrogen peroxide. Reduction and calcination increased the decomposition by forming metallic gold and palladium. Homogeneous dispersion of gold nanoparticles was achieved by a sol immobilization method which led to a decrease of propene oxide selectivity and an increase of hydrogen peroxide decomposition.

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“…Synthesis of TS-1 TS-1 was prepared following the procedure described in [42,43] with modification on the stage of hydrolysis of TEOS. First, 94.5 g TEOS was added into 149 g solution of 15 wt% TPAOH in water with vigorous stirring under N 2 atmosphere.…”

Section: Methodsmentioning

confidence: 99%

Effect of triethylamine treatment of titanium silicalite-1 on cyclohexanone ammoximation in a continuous system

Zhang

Wang

et al. 2014

Reac Kinet Mech Cat

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TS-1 has been hydrothermally treated by aqueous solutions of triethylamine, characterized by a number of techniques and studied in the ammoximation of cyclohexanone with NH 3 and H 2 O 2 in a continuous system. Some irregular hollow cavities are created after the treatment by desilication. The catalytic activities of TS-1 are not affected, but the catalyst stabilities significantly increase after the treatment, which can be attributed to the generation of the cavities. The treatment conditions are optimized, with the catalyst stability being extended to ten times of the conventional TS-1. After the treatment, triethylamine can be separated simply through distillation and recycled. The causes of deactivation are elucidated to be the deposition of higher weight byproducts formed on the surface of the catalysts and the deactivated TS-1 can be effectively regenerated through calcination in air.

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Epoxidation of propylene with H2O2 catalyzed by supported TS-1 catalyst in a fixed-bed reactor: Experiments and kinetics

Cited by 81 publications

References 20 publications

Effect of triethylamine treatment of titanium silicalite-1 on propylene epoxidation

Effect of triethylamine treatment of titanium silicalite-1 on propylene epoxidation

The effects of impregnation of precious metals on the catalytic activity of titanium silicate (TS-1) in epoxidation of propene using hydrogen peroxide

Effect of triethylamine treatment of titanium silicalite-1 on cyclohexanone ammoximation in a continuous system

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