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Nitrate anions intact in calcination treatment of Pt/NaMOR catalysts: a temperature-programmed reduction study by Shanmugam Yuvaraj; Tsong-Huei Chang; Chuin-Tih Yeh is a Materials Science article available to read on EtoBox.

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Samples of nitrate-ion exchanged NaMOR (NaM) i.e., HNO 3 /NaM, NaNO 3 /NaM and Pt/NaM were prepared by ion exchange of NaM with respective nitrate precursors--HNO 3 , NaNO 3 and [Pt(NH 3 ) 4 ](NO 3 ) 2 . The prepared samples were calcined at a temperature of T c $ 723 K in flowing air to decompose nitrate anions and then studied by temperature-programmed reduction (TPR) technique. A reduction peak around T r 1⁄4 830 AE 40 K invariably appeared in TPR profiles of calcined samples. This peak is assigned to reduction of nitrate anions remained intact on the calcination and adsorbed on zeolitic sodium cations during the ion exchange. In addition, the calcined Pt/MOR sample showed a sharp peak around T r 1⁄4 360 K due to reduction of PtO in channels of NaM.

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Author

Shanmugam Yuvaraj; Tsong-Huei Chang; Chuin-Tih Yeh

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 1387-1811)

Published

2003

Language

EN

Field

Materials Science (Physical Sciences)