E-viri
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Fishman, Zachary S; He, Yulian; Yang, Ke R; Lounsbury, Amanda W; Zhu, Junqing; Tran, Thanh Minh; Zimmerman, Julie B; Batista, Victor S; Pfefferle, Lisa D
09/2017, Letnik: 9, Številka: 35Journal Article
Understanding how nano-dimensionality impacts iron oxide based catalysis is central to a wide range of applications. Here, we focus on hematite nanosheets, nanowires and nanoparticles as applied to catalyze the reverse water gas shift (RWGS) probe reaction. We introduce a novel approach to synthesize ultrathin (4-7 nm) hematite nanosheets using copper oxide nanosheets as a hard template and propose a reaction mechanism based on density functional theory (DFT) calculations. Hematite nanowires and nanoparticles were also synthesized and characterized. H 2 temperature programmed reduction (H 2 -TPR) and RWGS reactions were performed to glean insights into the mechanism of CO 2 conversion to CO over the iron oxide nanomaterials and were compared to H 2 binding energy calculations based on density functional theory. While the nanosheets did exhibit high CO 2 conversion, 28% at 510 °C, we found that the iron oxide nanowires had the highest CO 2 conversion, reaching 50% at 750 °C under atmospheric pressure. No products besides CO and H 2 O were detected. Copper oxide nanosheets as a hard template for ultrathin iron hydroxide/oxide nanosheets.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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