• 文献标题:   Mechanistic insights into NO-H-2 reaction over Pt/boron-doped graphene catalyst
  • 文献类型:   Article
  • 作  者:   YAO ZH, LI L, LIU XG, HUI KN, SHI L, ZHOU FR, HU MC, HUI KS
  • 作者关键词:   no abatement, kinetic modeling, dft study, langmuir hinshelwood dualsite mechanism, graphenebased catalysi
  • 出版物名称:   JOURNAL OF HAZARDOUS MATERIALS
  • ISSN:   0304-3894 EI 1873-3336
  • 通讯作者地址:  
  • 被引频次:   6
  • DOI:   10.1016/j.jhazmat.2020.124327 EA JAN 2021
  • 出版年:   2021

▎ 摘  要

This work presents a systematical experimental and density functional theory (DFT) studies to reveal the mechanism of NO reduction by H-2 reaction over platinum nanoparticles (NPs) deposited on boron-doped graphene (denoted as Pt/BG) catalyst. Both characterizations and DFT calculations identified boron (in Pt/BG) as an additional NO adsorption site other than the widely recognized Pt NPs. Moreover, BG led to a decrease of Pt NPs size in Pt/BG, which facilitated hydrogen spillover. The mathematical and physical criteria of the Langmuir-Hinshelwood dual-site kinetic model over the Pt/BG were satisfied, indicating that adsorbed NO on boron (in Pt/BG) was further activated by H-spillover. On the other hand, Pt/graphene (Pt/Gr) demonstrated a typical Langmuir-Hinshelwood single-site mechanism where Pt NPs solely served as active sites for NO adsorption. This work helps understand NO-H-2 reaction over Pt/BG and Pt/Gr catalysts in a closely mechanistic view and provides new insights into roles of active sites for improving the design of catalysts for NO abatement.