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Sun, W. et al.

Sun, Xu, Chu, Shi,

Controllable synthesis, characterization and catalytic properties of WO(3)/ZrO(2) mixed oxides nanoparticles.

Tungsten-promoted zirconia (WO(3)/ZrO(2)) nanoparticles were synthesized in reverse micelles of water/sodium bis(2-ethylexyl) sulfosuccinate/isooctane, which were compared with WO(3)/ZrO(2) prepared by incipient wetness impregnation and sol-gel method. The control of particle size was achieved by varying the process variables, such as water-to-surfactant molar ratio and reagent concentration. Their sizes, appearances, crystal structures, and thermochemical behavior were characterized by UV-vis, TEM, XRD and TG-DTA. NH(3)-TPD and Hammett indicator measurement were also employed to study the acidity of samples. The results revealed that samples prepared in reverse micelles had higher percentages of T-ZrO(2) and greater acid strength than those of other samples. The alkylation of butene with isobutane on WO(3)/ZrO(2) was carried out in a fixed-bed reactor. Samples synthesized in reverse micelles had better reaction performance than others. A parallel relationship could be drawn between the catalytic activity and the acid amounts as well as the acid strength of the catalysis.[1]

References

Controllable synthesis, characterization and catalytic properties of WO(3)/ZrO(2) mixed oxides nanoparticles. Sun, W., Xu, L., Chu, Y., Shi, W. Journal of colloid and interface science. (2003) [Pubmed]

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