Effect of the addition of Pt and Fe on the structure and catalytic performance of NSR catalyst Ba/Al2O3
Journal Title: Science Paper Online - Year 2007, Vol 2, Issue 8
Abstract
A series of Ba/Al2O3 catalysts were prepared by impregnation method, and the effect of the addition of Pt and Fe on the catalyst structure, NOx storage capacity (NSC) and sulfur-resistance ability was investigated. Two types of barium species are found in Ba/Al2O3 catalyst, namely the highly dispersed barium species which strongly interacted with the alumina support, and the bulk BaAl2O4 spinel phase. The addition of Fe inhibits the dispersion of the barium species, leading to the agglomeration of the bulk BaAl2O4, whereas the addition of Pt promotes their dispersion, mainly by the hydrolysis of the BaAl2O4 phase during the impregnation of Pt. This hydrolyzed phase undergoes redistribution after calcination, and the barium species are re-dispersed. Both the addition of Fe and Pt increases the NOx storage capacity, but the implying mechanisms are different. Fe probably forms the NOx-adsorbed species with relatively high mobility, which in turn accelerates the transferring of NOx to the barium sites, while the function of Pt to NSC could be ascribed to its high oxidizing and trapping ability to NO. Pt is more efficient than Fe for increasing the NSC of the samples. The coexistence of Pt and Fe decreases the NSC, as compared with the sample only containing Pt, which may be due to the fact that the addition of Fe has decreased the contacting probability and weaken the interaction between Pt and Ba to some extent. However, the addition of Fe prominently suppresses the growth of BaSO4 crystal, showing.strong sulfur-resisting ability, while the addition of Pt promotes the SO2 adsorption, and large BaSO4 crystals are found in the sulphated sample.
Authors and Affiliations
Jinyong Luo, Ming Meng
Keywords
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