Gas-phase hydration of ethene over tungstena–zirconia

Chu, Wenling; Echizen, Tsuneo; Kamiya, Yuichi; Okuhara, Toshio

doi:10.1016/j.apcata.2003.09.041

Cited by 34 publications

(25 citation statements)

References 34 publications

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“…After filtering out the water and drying at 383 K for 24 h, NH 4 -Y and NH 4 -ZSM-5 were calcined at 823 K for 2 h to form H-Y and H-ZSM-5, respectively. WO 3 /ZrO 2 with a WO 3 concentration of 15 wt% was prepared by a co-precipitation method, as described in literature [29,30]. A 12.5% NH 3 aqueous solution was added dropwise to a mixed aqueous solution of ZrOCl 2 and (NH 4 ) 10 W 12 O 40 under stirring until a pH of 9 was achieved.…”

Section: Synthesesmentioning

confidence: 99%

Selective Hydrocracking of Fischer–Tropsch Waxes to High-quality Diesel Fuel Over Pt-promoted Polyoxocation-pillared Montmorillonites

et al. 2009

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Polyoxocation ([AlO 4 Al 12 (OH) 24 (H 2 O) 12 ] 7? and [Zr 4 (OH) 14 (H 2 O) 10 ] 2? )-pillared montmorillonites were prepared by ion exchange, and they were used as solid acid catalysts, in comparison to some other solid acids, for the selective hydrocracking of Fischer-Tropsch waxes to diesel-ranged hydrocarbons. XRD patterns and elemental analyses proved that the polyoxocations were successfully introduced into the interlayer region of the montmorillonites. N 2 adsorption-desorption measurement indicated that polyoxocation-pillared montmorillonites have large BET surface areas ([230 m 2 g -1 ), high thermal stability ([673 K), and large pores (comparing to those in zeolites). FT-IR spectra of chemisorbed pyridine indicated that polyoxocation-pillared montmorillonites possess both Lewis and Bronsted acid sites on the solid surface. Temperature-programmed desorption of ammonia indicated that the acidity strength of the polyoxocation-pillared montmorillonites was weaker than those of H-ZSM-5, H-Y, WO

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Section: Synthesesmentioning

confidence: 99%

Selective Hydrocracking of Fischer–Tropsch Waxes to High-quality Diesel Fuel Over Pt-promoted Polyoxocation-pillared Montmorillonites

et al. 2009

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“…The desorption profiles of the catalysts are shown in figure 5. The profiles were deconvoluted into two peaks corresponding to the best fit [15,16]. Total amount of NH 3 desorbed by the different catalysts and desorption temperatures are presented in table 4.…”

Section: Characterization Studymentioning

confidence: 99%

Effect of calcium and potassium on V2O5/ZrO2 catalyst for oxidative dehydrogenation of propane: a comparative study

Kunzru

2005

Catal Lett

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The effect of calcium and potassium on the physiochemical properties and performance of V 2 O 5 /ZrO 2 catalyst for oxidative dehydrogenation of propane was studied in the temperature range of 385-400°C. The vanadia loading was kept constant at 5 VO x / nm 2 and the atomic ratio A/V (A=Ca, K) was varied from 0.05 to 0.75. The vanadia surface structure was investigated using X-ray diffraction analysis (XRD), electron paramagnetic resonance (EPR), Raman spectroscopy and X-ray photoelectron spectroscopy (XPS). The redox property of the catalysts was studied by temperature programmed reduction (TPR) and temperature programmed oxidation (TPO) whereas surface acidity was measured by temperature programmed desorption (TPD) of ammonia. Calcium and potassium both interact with the surface V=O and stabilize the +5 oxidation state of vanadium. Interaction between calcium and vanadium was more intense though surface concentration of calcium was lower than that of potassium. For doped catalysts, the activity was lower due to an increase in reduction temperature as well as a lower extent of reduction and increased resistance to undergo redox cycles. On the other hand, removal of surface acidic sites by the dopants increased the propene selectivity. Potassium was more effective in decreasing the activity and increasing the propene selectivity.

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“…The presence of both palladium and an acidic support is a common feature of the catalysts used in the selective oxidation of ethylene to acetic acid [5][6][7][8][9][10][11]. Early studies [1,12] stressed the role of acid strength of the acidic support.…”

Section: Introductionmentioning

confidence: 99%

Catalytic oxidation of ethylene to acetic acid on Pd–HPA/SiO2 catalysts with different heteropoly acids

Wang

Chu

et al. 2009

React Kinet Catal Lett

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Gas-phase hydration of ethene over tungstena–zirconia

Cited by 34 publications

References 34 publications

Selective Hydrocracking of Fischer–Tropsch Waxes to High-quality Diesel Fuel Over Pt-promoted Polyoxocation-pillared Montmorillonites

Selective Hydrocracking of Fischer–Tropsch Waxes to High-quality Diesel Fuel Over Pt-promoted Polyoxocation-pillared Montmorillonites

Effect of calcium and potassium on V2O5/ZrO2 catalyst for oxidative dehydrogenation of propane: a comparative study

Catalytic oxidation of ethylene to acetic acid on Pd–HPA/SiO2 catalysts with different heteropoly acids

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