Effect of potassium on the catalytic activity of TS-1

Tatsumi, Takashi; Koyano, Keiko A.; Shimizu, Yoshimasa

doi:10.1016/s0926-860x(00)00630-x

Cited by 56 publications

(42 citation statements)

References 36 publications

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“…Materials produced with this higher yield may contain impurities that are detrimental to the final performance of the anode. Impurities such as alkali metals have been linked to the deactivation of catalysts in a number of electrochemical applications 21–23 …”

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of NiO–YSZ Anode Materials: Precipitation, Calcination, and the Effects on Sintering

Grgicak

Green

et al. 2005

Journal of the American Ceramic Society

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Nickel oxide yttria‐stabilized zirconia (NiO–YSZ) anode materials were synthesized via hydrolysis of the corresponding chloride solutions with NH3, NH3+NaOH, and NaOH as precipitation agents. Powder properties such as crystallite size, morphology, and sintering behavior of the final NiO–YSZ materials were also studied. The mechanism of the formation of NiO–YSZ was established for the different co‐precipitation techniques by the direct observation of Ni(NH3)n+2 complexes, Ni(OH)2 and NiO at different stages of the synthesis process. A direct relationship between the precipitation agent, the order of calcination from dry sample to final product, the final composition, the crystallite sizes and particle sizes of NiO, and the sinterability of the final products was established. A comparison of the powder and individual component properties indicate that the choice of precipitation agent greatly influences the final characteristics. Ni/YSZ materials prepared by NH3+NaOH precipitation offer higher Ni dispersion and nanocrystallinity of both the Ni and YSZ phases. The conductivity of both prepared materials compares well with mixed‐oxide materials of higher Ni content.

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Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of NiO–YSZ Anode Materials: Precipitation, Calcination, and the Effects on Sintering

Grgicak

Green

et al. 2005

Journal of the American Ceramic Society

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“…They observed that the selectivity to epoxide increased as the ratio of Lewis to Brønsted acid sites increased as a result of alkali addition. However, the addition slightly reduce the catalyst's conversion [11,12]. Meanwhile, in the epoxidation reaction, it is well known that the interaction between titanium and oxidizing agents to form titanium-oxo species should occur before the reaction with alkene to produce epoxides [13,14].…”

Section: Introductionmentioning

confidence: 99%

Tungsten Oxides-Containing Titanium Silicalite for Liquid Phase Epoxidation of 1-octene with Aqueous Hydrogen Peroxide

et al. 2008

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Tungsten oxides (WO 3 ) have been supported on the titanium silicalite (TS-1) by impregnation method. The solids have been tested for epoxidation of 1-octene with aqueous H 2 O 2 in acetone as solvent. It was found that the presence of tungstate species in the catalysts enhanced the rate of the formation of epoxide. Diol as a site-product was also observed due to the acidic properties of the catalysts.

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“…In comparison with TS-1 and potassium chloride modified TS-1, it is clear from B = L ratio that the number of Lewis acid sites (LAS) are high in K-modified catalysts; however, the number of Brönsted acid sites (BAS) are low on K-TS-1 catalyst indicates that all the exchangeable sites are occupied with K. K-impregnation also leads to K-exchange to a good extent was evident from the decrease in BAS. Introduction of metal cations in the TS-1 produced changes in the number of BAS, the intensity of BAS clearly decreased when potassium cations were added [27,28]. The presence of K ?…”

Section: Xrd Analysismentioning

confidence: 99%

“…The presence of K ? , even in very small amounts, severely retards the catalytic oxidation activity [28].…”

Section: Xrd Analysismentioning

confidence: 99%

The Synthesis of 1,4-Diazabicyclo (2.2.2) Octane over a Pre-Treated Titanium Silicalite-1 Catalyst

et al. 2008

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Potassium chloride salt pre-treated titanium silicalite-1 (TS-1) zeolite (K-TS-1) was prepared via an ion-exchange method. XRD, EDX and BET were used to identify the structure of the zeolite. The BET surface area and the adsorption/desorption cumulative pore volume of the K-TS-1 catalyst were about 297 m 2 /g and 0.213 cm 3 /g, respectively. The average pore diameter of the K-TS-1 catalyst was 29.49 Å . The catalytic activity of K-TS-1 catalyst was studied in the fixed-bed catalytic reactor. 1,4-Diazabicyclo (2.2.2) octane (DABCO) was prepared from ethylenediamine (EDA) over the K-TS-1 zeolite catalyst. The influences of various reaction parameters such as reaction temperature, space velocity and concentration of EDA were discussed. The conversion of EDA was more than 96% and the selectivity of DABCO and PIP were up to 64 and 30%, respectively, in the temperature of 340°C and weight hourly space velocity of 1.5 h -1 in the presence of water.

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Effect of potassium on the catalytic activity of TS-1

Cited by 56 publications

References 36 publications

Synthesis and Characterization of NiO–YSZ Anode Materials: Precipitation, Calcination, and the Effects on Sintering

Synthesis and Characterization of NiO–YSZ Anode Materials: Precipitation, Calcination, and the Effects on Sintering

Tungsten Oxides-Containing Titanium Silicalite for Liquid Phase Epoxidation of 1-octene with Aqueous Hydrogen Peroxide

The Synthesis of 1,4-Diazabicyclo (2.2.2) Octane over a Pre-Treated Titanium Silicalite-1 Catalyst

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