1. Low-Temperature and Highly Efficient Reduction of O 2 -Containing CO 2 Mixtures via Pt-Ni/CeO 2 Oxygen Carriers.
- Author
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Sun X, Zhao W, Wang C, Lei Y, Xiao H, Yang Y, Zhu L, and Chen X
- Abstract
Poor O
2 tolerance and high reaction temperature of the conventional oxygen carriers challenge the direct utilization of impure CO2 via chemical looping. Here, Pt-Ni bimetallic Ce-based oxygen carriers with excellent O2 tolerance are developed for highly efficient reduction of O2 -containing CO2 at low temperatures. At a temperature as low as 700 °C, high CO2 conversion (≈92%) is obtained over 0.1 wt% Pt-0.1wt% Ni/CeO2 oxygen carrier in the CO2 feed gas with 16.7% O2 impurities. These results benefit from that Pt-Ni bimetal plays a crucial role in improving CH4 partial oxidation and accelerating the breaking of the C═O bond to alleviate the competitive oxidation of O2 impurities. Ni compensates for the reduction of low-temperature redox activity caused by the decrease of Pt content. Moreover, Pt-Ni/CeO2 oxygen carriers exhibit excellent structural and performance stability during redox cycles. This work presents a feasible strategy for the direct utilization of impure CO2 at low temperatures and realizing a carbon-neutral cycle., (© 2024 Wiley‐VCH GmbH.)- Published
- 2024
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