1. Modification of Cu/SiO2 Catalysts by La2O3 to Quantitatively Tune Cu+‐Cu0 Dual Sites with Improved Catalytic Activities and Stabilities for Dimethyl Ether Steam Reforming.
- Author
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Huang, Jingjing, Ding, Tong, Ma, Kui, Cai, Jinmeng, Sun, Zhirui, Tian, Ye, Jiang, Zheng, Zhang, Jing, Zheng, Lirong, and Li, Xingang
- Subjects
METHYL ether ,STEAM reforming ,COPPER ,CATALYTIC reduction ,LANTHANUM - Abstract
Abstract: Dimethyl ether steam reforming (DME SR) is a promising route to provide H
2 for on‐board H2 ‐based fuel cells. Herein, we synthesized the La2 O3 ‐modified Cu/SiO2 catalyst with dual copper species of Cu0 and Cu+ for DME SR, which exhibits both the high catalytic performance and long‐term stability. The strong electron donor‐acceptor interaction between the lanthanum and copper species occurs after reduction of the catalysts, which is an essential factor to quantitatively determine the ratio of Cu+ /(Cu0 +Cu+ ). The addition of La can improve the dispersion of both metallic Cu and Cu2 O on the catalysts, as well. After modulating the ratio of Cu+ /(Cu0 +Cu+ ) to ∼0.5 by varying the La loading, we achieved the highest activity and lowest CO selectivity. After the durability tests, the results of TEM, EXAFS, and XPS reveal that the addition of La on the Cu/SiO2 catalysts not only stabilizes the copper species from aggregation, especially for the metallic Cu, but also avoids over‐reduction of the Cu+ species to Cu0 . The constant ratio of Cu+ /(Cu0 +Cu+ ) on the La‐modified Cu/SiO2 catalyst ensures the high catalytic stability in DME SR. [ABSTRACT FROM AUTHOR]- Published
- 2018
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