Abstract
PbO—ZrO 2 catalysts have been prepared by sequential impregnation/calcination onto Al 2O 3 support for high concentration N 2O (27.97 mol%) decomposition. The p-block-element involved material system has been investigated with GC, BET, DTA, XRD and catalytic activity evaluation. It is found that with an atomic ratio Pb:Zr = 1:6 the material system shows the best catalytic performance for the decomposition. The catalyst with this composition has a tetragonal phase of ZrO 2 over reaction temperatures. The catalytic activity observed can be attributed to the presence of Pb cations with mixed valence states in tetragonal ZrO 2 lattice. Doping gases such as H 2O, CO 2, and O 2 are also mixed into the N 2O and studied. It is found that N 2O adsorption is rate-limiting step for the decomposition reaction. The reaction can be described as first order with respect to partial pressure of N 2O, considering that decomposition product O 2 exhibits no inhibition effect on the reaction in high conversion region.
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