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Reactivity and Physicochemical Characterization of V2O5-WO3/TiO2 De-NOx Catalysts.-As shown by XRD, surface area and pore distribution measurements, EPR, UV-VIS diffuse reflectance, FTIR, and laser-Raman spectroscopies and by tests of the catalytic reactivity in the reduction of NOx by NH3, the title catalysts exhibit a higher reactivity than V2O5/TiO2 and WO3/ TiO2 samples with the same metal loading. A strong electronic interaction between V and W oxide species at the TiO2 surface is observed leading to a higher reducibility of the ternary catalysts. This electronic interaction is suggested to be responsible for the higher catalytic reactivity as compared to the binary samples. -(ALEMANY, L. J.; LIETTI, L.; FERLAZZO, N.; FORZATTI, P.; BUSCA, G.; GIAMELLO, E.; BREGANI, F.; J.

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An approach to the analysis of the plate-type catalysts for high-dust selective catalytic reduction (SCR) applications is herein presented. Commercial systems were studied in the form of slabs. NO x reduction and SO2 oxidation runs were performed spanning a wide range of operating conditions. The results were analyzed on the basis of a 1D model. The estimates of the intrinsic activity parameters and of the effectiveness factors were found to differ significantly among the catalysts under study. Aspects related to scale-up were also addressed on a preliminary basis. Concerning the SO2 oxidation reaction, the lab-scale analysis of the catalysts can be directly exploited for reactor design. On the contrary, the evaluation of the DeNO x performance of the industrial plate-type monolith requires the study of the interphase mass transfer in the real scale; the NO conversion data collected in the slab-reactor were estimated as not conservative in relation to design applications.

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