Taming the stability of Pd active phases through a compartmentalizing strategy toward nanostructured catalyst supports

Abstract

The design and synthesis of robust sintering-resistant nanocatalysts for high-temperature oxidation reactions is ubiquitous in many industrial catalytic processes and still a big challenge in implementing nanostructured metal catalyst systems. Herein, we demonstrate a strategy for designing robust nanocatalysts through a sintering-resistant support via compartmentalization. Ultrafine palladium active phases can be highly dispersed and thermally stabilized by nanosheet-assembled γ-Al 2 O 3 (NA-Al 2 O 3 ) architectures. The NA-Al 2 O 3 architectures with unique flowerlike morphologies not only efficiently suppress the lamellar aggregation and irreversible phase transformation of γ-Al 2 O 3 nanosheets at elevated temperatures to avoid the sintering and encapsulation of metal phases, but also exhibit significant structural advantages for heterogeneous reactions, such as fast mass transport and easy access to active sites. This is a facile stabilization strategy that can be further extended to improve the thermal stability of other Al 2 O 3 -supported nanocatalysts for industrial catalytic applications, in particular for those involving high-temperature reactions.

Dense MoS2 Micro‐Flowers Planting on Biomass‐Derived Carbon Fiber Network for Multifunctional Sulfur Cathodes

“…Nevertheless, 2D MoS 2 nanosheets suffer from easy aggregation and limited conductivity. The former can be efficiently overcome by the hierarchical assembly of 2D nanosheets into 3 dimensional (3D) configurations and the latter is always solved by rationally coupling with carbon materials, for example, carbon nanotube and/or graphene …”

“…[31] Nevertheless, 2D MoS 2 nanosheets suffer from easy aggregation and limited conductivity. The former can be efficiently overcome by the hierarchical assembly of 2D nanosheets into 3 dimensional (3D) configurations [32] and the latter is always solved by rationally coupling with carbon materials, for example, carbon nanotube and/or graphene. [33] Herein, we designed and fabricated dense MoS 2 microflowers assembled by cross-linked 2D MoS 2 nanoflakes planting on biomass-derived CF network (MoS 2 /CFs) for multifunctional sulfur cathodes of LSBs.…”

The Influence of Residual Sodium on the Catalytic Oxidation of Propane and Toluene over Co3O4 Catalysts

“…Noble metal (Pt, Pb, Au, Ru, etc.) dispersed on supports with high specific surface areas have long been studied because of their remarkable performance in VOC oxidation [12][13][14][15]. However, low dosages of noble metals are required while maintaining the activity due to their high price and low availability.…”

Synthesis of a binary alloy nanoparticle catalyst with an immiscible combination of Rh and Cu assisted by hydrogen spillover on a TiO2 support

“…The development of new and facile techniques for the synthesis of such solid solution alloys with immiscible metal combinations remains desirable, even though these NPs are not thermodynamically stable and readily grow to form larger particles. 25,26 One means of mitigating this problem is to x the NPs on supports having relatively high surface areas, such as metal oxides, so as to maintain their small sizes particularly in the eld of catalysis. Interestingly, metal NPs are affected by the supports employed during synthesis and will exhibit different properties depending on the support.…”