Boron-doped graphene nanosheet-supported Pt: a highly active and selective catalyst for low temperature H₂-SCR

Abstract

A series of boron-doped graphene-supported Pt (Pt/BG) nanosheets were designed and synthesized using a one-step facile hydrothermal method. ICP, XPS, and TPD results confirmed that boron atoms were successfully embedded into the graphene matrix. The selective catalytic reduction of nitric oxide with hydrogen (H2-SCR) was tested over Pt/BG catalysts. The multi-roles of doped-boron were investigated by Raman, BET, CO-chemisorption, H2-TPD, XPS, and NO-TPD. Boron doping led to a higher dispersion and smaller size of Pt nanoparticles, facilitated hydrogen spillover, promoted more metallic Pt formation, and increased both H2 and NO chemisorption, which were attributed to an enhanced Pt nucleation rate over doped-boron, electron donation from boron to Pt, and extra chemisorption sites. The reaction performances (conversion 94.7%, selectivity 90.3%, and TOF 0.092 s-1) were greatly promoted attributing to a bifunctional catalytic mechanism. This work paves the way to modify the structure and tune the chemisorption ability of graphene-based catalysts, and provides novel insights for designing high performance catalysts.

Diatomite Supported Pt Nanoparticles as Efficient Catalyst for Benzene Removal

“…0.3% Pt/SiO 2 presents single desorption peak at 76 °C, which is ascribed to hydrogen chemisorbed on the surface of Pt NPs . For the 0.3% Pt/diatomite sample, there are two H 2 desorption peaks situated at 222 and 554 °C, the peak at lower temperature is a result of hydrogen adsorbed on the sites of the contact interface between Pt and diatomite support, and the peak at higher temperature is as a result of spillover hydrogen related to the support. − Thus, H 2 -TPD proved that Pt has a strong interaction with diatomite …”

Mechanistic insights into NO‒H2 reaction over Pt/boron-doped graphene catalyst

“…The detailed preparation procedures were reported in the previous work [48]. Briefly, a onepot hydrothermal method was employed with homemade graphene oxide (GO, Figure S1) as the substrate while Pt(NH 3 ) 4 (NO 3 ) 2 and boric acid were used as Pt and boron sources, respectively.…”

“…Relatively low temperatures (300, 310, 320, and 330 K) and high gas flow rate were selected for kinetic data collection since high conversion would be achieved at high-temperature for NO reduction by H 2 [48]. As a result, the typical NO conversion was less than 20%.…”

Hydrothermal Synthesis of a Pt/SAPO-34@SiC Catalytic Membrane for the Simultaneous Removal of NO and Particulate Matter

“…Liu et al employed a WO 3 -modified Pt/TiO 2 catalyst for the catalytic degradation of NO x and achieved an 88% NO x conversion rate due to the large amounts of adsorbed NH 4 + as well as the NO x species generated by Pt and WO 3 . Hu et al . used a facile hydrothermal method to fabricate boron-doped graphene-supported Pt (Pt/BG) nanosheets, which were applied for the catalytic reduction of NO with H 2 .…”

“…Liu et al 15 amounts of adsorbed NH 4 + as well as the NO x species generated by Pt and WO 3 . Hu et al 16 used a facile hydrothermal method to fabricate boron-doped graphenesupported Pt (Pt/BG) nanosheets, which were applied for the catalytic reduction of NO with H 2 . The boron-doped graphene enhanced the dispersion of the Pt nanoparticles and facilitated hydrogen spillover, which both contributed to the high SCR performance of 94.7% at a gas hourly space velocity (GHSV) of 80,000 h −1 .…”