TY - JOUR
T1 - Pd-integrated lanthanum-transition metal perovskites for methanol partial oxidation
AU - Li, Chia Liang
AU - Wang, Chien Lin
AU - Lin, Yu Chuan
N1 - Funding Information:
This work was sponsored by the National Science Council of Taiwan under grant #NSC 98-2218-E-155-006 . Valuable suggestions of Prof. C.-T. Yeh (Yuan Ze University) and anonymous reviewers are gratefully appreciated.
PY - 2011/10/2
Y1 - 2011/10/2
N2 - Palladium integrated lanthanum-transition metal perovskites (LaMnO 3, LaFeO3, and LaCoO3) were employed in methanol partial oxidation to formaldehyde. The crystallinity of these perovskites remained unchanged by incorporating up to 5 mol% Pd cations into their respective frameworks. Such a cation replacement could yield a positive effect on particle size and catalyst reducibility. The Pd cation exists in perovskites mostly as Pd2+. Under partial oxidation conditions, the reactivity and formaldehyde selectivity of Pd-free perovskites were relatively low compared to their Pd-impregnated counterparts. Most importantly, the reaction mechanism could be promoted diversely. For Pd-free perovskites, methanol combustion, methanol oxidation to syngas and water, and methanol dehydrogenation were found to be prominent. In contrast, methanol partial oxidation to formaldehyde and methanol dehydrogenation were the major pathways of Pd-integrated catalysts. Both reactions can be seen as major factors in the elevation of formaldehyde selectivity.
AB - Palladium integrated lanthanum-transition metal perovskites (LaMnO 3, LaFeO3, and LaCoO3) were employed in methanol partial oxidation to formaldehyde. The crystallinity of these perovskites remained unchanged by incorporating up to 5 mol% Pd cations into their respective frameworks. Such a cation replacement could yield a positive effect on particle size and catalyst reducibility. The Pd cation exists in perovskites mostly as Pd2+. Under partial oxidation conditions, the reactivity and formaldehyde selectivity of Pd-free perovskites were relatively low compared to their Pd-impregnated counterparts. Most importantly, the reaction mechanism could be promoted diversely. For Pd-free perovskites, methanol combustion, methanol oxidation to syngas and water, and methanol dehydrogenation were found to be prominent. In contrast, methanol partial oxidation to formaldehyde and methanol dehydrogenation were the major pathways of Pd-integrated catalysts. Both reactions can be seen as major factors in the elevation of formaldehyde selectivity.
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U2 - 10.1016/j.cattod.2011.01.038
DO - 10.1016/j.cattod.2011.01.038
M3 - Article
AN - SCOPUS:80052261515
SN - 0920-5861
VL - 174
SP - 135
EP - 140
JO - Catalysis Today
JF - Catalysis Today
IS - 1
ER -