Hydroxyapatite-supported rhodium catalysts for N2O decomposition

N2O decomposition properties of Ru catalysts supported on various oxide materials and SnO2

Nitrous oxide (N2O) is a stratospheric ozone depleting greenhouse gas that has global warming potential. As the catalytic decomposition of N2O is one of the most promising techniques for N2O emissions abatement, in this study, for this purpose the properties of Ru supported on various oxide materials were investigated under excess O2 conditions, and the identities of the N2O adsorption species on the catalysts were confirmed. To clarify the correlation between the catalytic properties and N2O decomposition activity, the supported Ru catalysts were characterised by means of powder X-ray diffraction, X-ray fluorescence measurements, energy-dispersive X-ray mapping and several gas sorption techniques. The results showed that the redox properties for Ru (RuO2) at low temperature are closely associated with N2O decomposition activity. The local structures, optimal Ru loading and N2O adsorption species of the novel Ru/SnO2 catalysts were studied and they showed high activity for N2O decomposition.

Hydroxyapatite, a multifunctional material for air, water and soil pollution control: A review

Hydroxyapatite (Ca₁₀(PO₄)₆(OH)₂), a calcium phosphate biomaterial, is a very promising candidate for the treatment of air, water and soil pollution. Indeed, hydroxyapatite (Hap) can be extremely useful in the field of environmental management, due in one part to its particular structure and attractive properties, such as its great adsorption capacities, its acid-base adjustability, its ion-exchange capability and its good thermal stability. Moreover, Hap is able to constitute a valuable resource recovery route. The first part of this review will be dedicated towards presenting Hap's structure and defining properties that result in its viability as an environmental remediation material. The second will focus on its use as adsorbent for wastewater and soil treatment, while indicating the mechanisms involved in this remediation process. Finally, the last part will impart all findings on Hap's applications in the field of catalysis, whether it be as catalyst, as photocatalyst, or as active phase support. Hence, all of the above will have served in showcasing the benefits gained by employing hydroxyapatite in air, water and soil clean-up.

Bimetallic Rh–Fe catalysts for N2O decomposition: effects of surface structures on catalytic activity

Well-homogenized RhFe alloy nanoparticles and core–shell structured Fe@Rh nanoparticles were highly dispersed on SBA-15 and then applied to N₂O catalytic conversion.

Catalytic decomposition of N2O over Rh/Zn–Al2O3 catalysts

Promoted oxygen adsorption–desorption properties of smaller Rh₂O₃ nanoparticles supported on Zn-modified γ-Al₂O₃ result in a superior activity for N₂O decomposition.

Activity and deactivation of Ru supported on La1.6Sr0.4NiO4 perovskite-like catalysts prepared by different methods for decomposition of N2O

Ru/La_1.6Sr_0.4NiO₄ prepared by the addition of ethylene glycol shows excellent activity for N₂O decomposition, even in the presence of O₂ and water.

It is no laughing matter: nitrous oxide formation in diesel engines and advances in its abatement over rhodium-based catalysts

N₂O appears as one of the undesired by-products in exhaust gases emitted from diesel engine aftertreatment systems, such as diesel oxidation catalysts (DOC), lean NO_x trap (LNT, also known as NO_x storage and reduction (NSR)) or selective catalytic reduction (NH₃-SCR and HC-SCR) and ammonia slip catalysts (ASC, AMOX, guard catalyst).