Selective catalytic reduction of nitric oxide with hydrogen (H2-SCR) is an attractive approach for NOx removal. In this work, a strategy to design and prepare a superior catalyst system for H2-SCR is demonstrated. The Pt/boron-doped graphene catalysts were prepared by a facile hydrothermal method. Boron doping into layered graphene was synthesized by replacing both carbon and oxygen atoms in the graphene oxide matrix, which was confirmed by ICP, XPS, and TPD. The doped-boron had multi-roles to affect both structure and chemisorption ability of Pt/BG catalysts: 1) enhancing Pt dispersion due to the increased Pt nucleation rate over doped-boron; 2) facilitating hydrogen spillover by decreasing Pt nanoparticle size; 3) promoting more metallic Pt formation by donating an electron from boron to Pt; 4) increasing H2 adsorption by increasing Pt dispersion; and 5) improving NO adsorption by increasing Pt dispersion and providing extra foreign active sites. The reaction performance of the optimal Pt/BG for H2-SCR was greatly promoted due to the above beneficial effects from boron doping. Its comparable performance with the reported work indicates its great potential applications in the future. This strategy definitely paves a way to modify structure and tune chemisorption ability of graphene-based catalysts, and provides novel insights for designing high performance catalysts.

Boron effect on low temperature H2-SCR catalysts

2019 Spring National Meeting

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.