Precious Metal Based Perovskites for Methanol Partial Oxidation

Wednesday, October 19, 2011
Exhibit Hall B (Minneapolis Convention Center)
Chia-Liang Li, Chien-Lin Wang, Zih-Jyun Jian and Yu-Chuan Lin, Chemical Engineering & Materials Science, Yuan Ze University, Chungli, Taiwan

Palladium, platinum, and rhodium integrated lanthanum-transition metal perovskites were employed in methanol partial oxidation to formaldehyde. The crystallinity of these perovskites remained unchanged by incorporating up to 5 mol% noble metal cations into their frameworks. Such a cation replacement could yield a positive effect on particle size and catalyst reducibility. Under partial oxidation conditions, the reactivity and formaldehyde selectivity of perovskites without cation replacement were relatively low compared to their Pd-, Pt-, and Rh-impregnated counterparts. Most importantly, the reaction mechanism could be promoted diversely. For noble-metal-free perovskites, methanol combustion, oxidation to syngas and water, and dehydrogenation were found to be prominent. In contrast, partial oxidation to formaldehyde and dehydrogenation were the major pathways of precious-metal-integrated catalysts. Both reactions can be attributed to the elevation of formaldehyde selectivity.

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