Noble Metal Nanoparticles Decorated Boron Nitride Nanotubes for Efficient and Selective Low-Temperature Catalytic Reduction of Nitric Oxide with Carbon Monoxide

Abstract

Parallel to CO2 emission, NO x emission has become one of the menacing problems that seek a simple, durable, and high-efficiency deNO x catalyst. Herein, we demonstrated simple syntheses of platinum group metal nanoparticle-decorated f-BNNT (PGM = Pd, Pt, and Rh, and f-BNNT stands for −OH-functionalized boron nitride nanotubes) as a catalyst for efficient and selective reduction of NO by CO at low-temperature conditions. PGM/f-BNNT with a low amount of noble metal nanoparticles (0.7–0.8 wt %) presents very efficient catalytic activity for NO reduction as well as CO oxidation during their removal process. The removal efficiencies of NO and CO with Pd/f-BNNT, Pt/f-BNNT, and Rh/f-BNNT catalysts were investigated under various temperatures, flow rates, and reaction times, respectively. For most cases, NO catalytic reduction with CO reaction was >99% at a temperature as low as ∼200 °C. The catalyst robustness and efficiency were also verified by presenting almost 100% conversion of NO using a Rh/f-BNNT catalyst, which was aged under humid air at 600 and 700 °C for 24 h, respectively. The synergic effect of the catalytic efficacy of the well-dispersed noble metal nanoparticles and the excellent surface properties of BNNT are reasons for the high selectivity and catalytic property at a low temperature. On the basis of this investigation, we demonstrated that the noble metal nanoparticle-decorated f-BNNT catalysts are possible to save expensive PGM catalysts, such as Pt, Pd, and Rd, as much as 100 times while presenting similar or better catalytic performance for simultaneous NO and CO removals.

Quantifying the Two-Dimensional Driving Patterns of Chemisorbed Oxygen and Particle Size on NO Reduction Activity and Mechanism

“…Selective catalytic reduction of NO, an important branch of heterogeneous catalysis, plays an essential role in the catalytic purification of exhaust . It has been investigated intensively, such as the design of novel catalysts, − the deactivation or resistance mechanism to SO 2 , H 2 O, and alkali metal, ,− building structure–activity relationships, ,, and the innovation in reaction mechanisms. ,, In-depth explorations in the latter two aspects are propitious for developing novel catalysts and facilitating the efficiency of researchers. , Effects of particle size on structure–activity relationships of NH 3 -SCR have been studied as well, mainly involving V 2 O 5 -WO 3 /TiO 2 , Fe or Cu/Zeolites, , and M/CeO 2 -γAl 2 O 3 (M = Pt, Pd, Rh) catalysts . However, these studies illustrated the role of the aggregation size of active components in activity and activating intermediates qualitatively rather than quantitatively.…”

Modification Effect of Pt on the Active Sites of Sulfated CeO2 Nanorods for the Selective Catalytic Reduction of NO

“…Pt-modified catalysts with excellent low-temperature activity and high chemical and hydrothermal stability are widely used in catalytic reactions. – For example, Chio et al synthesized platinum group metal nanoparticle-decorated boron nitride nanotubes as a catalyst for the efficient and selective reduction of NO by CO at low-temperature conditions. Ji et al reported negatively charged single-atom Pt-embedded catalysts which showed good SO 2 resistance in the selective catalytic reduction of NO x by CO.…”

Enhancement of Columbic Efficiency and Capacity of Li-Ion Batteries using a Boron Nitride Nanotubes-Dispersed-Electrolyte with High Ionic Conductivity

“…The Lewis acid sites in the BNNT are assumed to interact with the oxygen of the cyclic carbonates, leading to the desolvation of Li + and hence providing free Li + responsible for enhanced Li-ion transport. Whereas, the defects sites in BNNT serve as binding sites for the anions, channelizing the transport of Li + during the charge/discharge process. , Moreover, due to the structural advantage of the BNNT, − , commonly investigated for ion transport in fluid media the open-end hollow cylindrical structure allows the exhohedral and endohedral transport of Li + through electrostatic interactions. − Hence, due to the multiple structural benefits, BNNT qualifies as an excellent electrolyte additive for LIBs.…”