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Continuous synthesis of atomically dispersed Rh supported on MgAl2O4 in hydrogen production from liquid hydrocarbon
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  • Qiangqiang Xue,
  • Binhang Yan,
  • Yujun Wang,
  • Guangsheng Luo
Qiangqiang Xue
Tsinghua University

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Binhang Yan
Tsinghua University
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Yujun Wang
Tsinghua University
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Guangsheng Luo
Tsinghua University
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Abstract

Single-atom catalysts with optimal atom utilization and outstanding activity have penetrated the frontier of heterogeneous catalysis. However, the large-scale synthesis of this class of catalysts is still a bottleneck for their industrialization. Herein, we suggest a two-stage micro-dispersion approach to synthesize mesoporous MgAl2O4-supported atomically dispersed Rh, which is more competitive than the batch method for boosting the uniform dispersion of Rh. By increasing the Rh loading, SACs (< 0.05wt%), SACs + NPCs (0.05–0.17 wt%), and NPCs (0.17–1.10 wt%) were obtained and then characterized by the HADDF-STEM technique. For n-octane steam reforming, the TOF of the SAC (0.01 wt%) was approximately 30 times that of the NPC (1.10 wt%), while the Rh amount of SAC was only 3% that of the NPC for the same fuel conversion. Under a high-temperature (750 ℃) steam atmosphere for 15 h, the hydrogen formation rate only declined from 25.1 to 23.8 mol/mol-C8H18.