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In situ infrared study of catalytic decomposition of NO on carbon-supported Rh and Pd catalysts

2000; Elsevier BV; Volume: 55; Issue: 3 Linguagem: Inglês

10.1016/s0920-5861(99)00242-4

1873-4308

Khalid A. Almusaiteer, Raja Krishnamurthy, Steven S.C. Chuang,

Catalysis and Oxidation Reactions

The direct catalytic decomposition of NO on Rh/Al2O3, Rh/C, Pd/Al2O3, and Pd/C catalysts was investigated at 673 K by in situ infrared (IR) coupled with mass spectroscopy (MS). NO decomposition on these catalysts initially produced N2 and adsorbed oxygen. Different catalysts exhibit different capabilities for manipulating adsorbed oxygen. Rh/Al2O3 shows little activity for oxygen desorption, resulting in loss of catalyst activity; Rh/C shows the ability for promoting the adsorbed oxygen–carbon reaction, removing oxygen in the form of CO2; Pd/Al2O3 shows some activity for O2 desorption. Use of carbon as a support for Pd promotes O2 desorption, resulting in improvement of NO decomposition activity. The in situ IR results provide evidence to support the behavior of adsorbed oxygen on carbon-supported Rh and Pd catalysts.