Abstract
A chemiluminescence-based analyzer of NO (x) gas species has been applied for high-throughput screening of a library of catalytic materials. The applicability of the commercial NO (x) analyzer as a rapid screening tool was evaluated using selective catalytic reduction of NO gas. A library of 60 binary alloys composed of Pt and Co, Zr, La, Ce, Fe or W on Al(2)O(3) substrate was tested for the efficiency of NO (x) removal using a home-built 64-channel parallel and sequential tubular reactor. The NO (x) concentrations measured by the NO (x) analyzer agreed well with the results obtained using micro gas chromatography for a reference catalyst consisting of 1 wt% Pt on γ-Al(2)O(3). Most alloys showed high efficiency at 275 °C, which is typical of Pt-based catalysts for selective catalytic reduction of NO. The screening with NO (x) analyzer allowed to select Pt-Ce((X)) (X=1-3) and Pt-Fe((2)) as the optimal catalysts for NO (x) removal: 73% NO (x) conversion was achieved with the Pt-Fe((2)) alloy, which was much better than the results for the reference catalyst and the other library alloys. This study demonstrates a sequential high-throughput method of practical evaluation of catalysts for the selective reduction of NO.