Analysis of the performance of plate-type monolithic catalysts for selective catalytic reduction DeNOx applications

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. NOx 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.