Strong Metal–Support Interaction over PtPdCu/Al₂O₃ toward Hydrogenation of Nitrobenzene

Abstract

Multimetallic nanoparticles are an important class of catalysts with significant technological potential. In this work, trimetallic PtPdCu nanoparticles synthesized via a facile one-pot colloidal method were loaded on Al 2 O 3 . A two-step treatment, including ligand exchange and low-temperature annealing, was applied subsequently to remove the stabilizing ligands. We studied the effects of annealing temperature on the physicochemical properties of the supported PtPdCu nanoparticles and their catalytic activities for nitrobenzene hydrogenation. It is found that varying the annealing temperature of PtPdCu/Al 2 O 3 catalysts not only effectively removes the surfactant, but also modulates the metal−support interaction between the metal nanoparticles and the support in terms of coverage of Al 2 O 3 on metal nanoparticles, which further tunes the catalytic activity for nitrobenzene hydrogenation. The partially Al 2 O 3 -encapsulated PtPdCu exhibits better catalytic activity for hydrogenation of nitrobenzene to aniline over the fully Al 2 O 3 -encapsulated and surfactant-covered PtPdCu catalyst.

A PtPdCoCuNi high-entropy alloy nanocatalyst for the hydrogenation of nitrobenzene

“…S6E † ) at 918.9 eV confirms the metallic state of Cu species. 14 The binding energy of Ni 2p 3/2 at approximately 853.0 eV (Fig. S6F † ) is attributed to metallic Ni.…”

“…Nowadays, the colloid solvothermal method has been widely used in the synthesis of bimetallic or trimetallic alloy nanoparticles. 14,15 This one-pot colloid-based approach can integrate distinct metal elements into nanocrystals to form well-defined structure, by which allows the preparation of nanoparticles with uniform chemical compositions and homogenous size distributions. 16,17 Therefore, a general colloidal approach to synthesis of HEA nanoparticles should be developed to provide new opportunities in catalyst design and beyond.…”

The Journal of Physical Chemistry C Virtual Special Issue on “Energy and Catalysis in China”

“…(2) Environmental catalysis: catalytic elimination of soot and NO x on Mn-based perovskites, catalytic dehydrochlorination of dichloroethane on porous carbon, oxidation of propane and CO on reducible oxide-supported Pt or PtCu nanocatalysts, , complete oxidation of benzene on Pt SACs, preferential oxidation of CO on Cu x Ce 1– x O 2 nanorods, CO oxidation on Pd/ZnO catalysts or Au–Fe 2 O 3 interfaces, and selective catalytic reduction of nitrogen oxide with methane on Co-exchanged SSZ-13 zeolite catalysts . (3) Synthesis of fine chemicals: selective reduction of nitrobenzene on iron and nitrogen cofunctionalized carbon materials or PtPdCu/Al 2 O 3 , hydrogenation of quinoline and benzoic acid on RhPt/MCM-41, hydroformylation of diisobutene on CoFe alloy catalysts, and selective hydrogenation of cinnamaldehyde to cinnamyl alcohol on Pt@Fe-CeO 2 catalysts or Pt/TiO 2 . Photocatalysis can directly convert solar energy into chemical energy, and two important photocatalytic reactions are included in this VSI: photocatalytic water splitting on Au nanoparticles embedded in g -C 3 N 4 , BiVO 4 , Ta 3 N 5 , SnNb 2 O 6 nanoplates, silicon material, MoO 3 –ZnIn 2 S 4 , carbon nitride, NiFe metal–organic framework (MOF) and cobaloxime-modified Ti-doped hematite, and photocatalytic CO 2 conversion on α-Fe 2 O 3 /CdS heterostructures, CdSe/CdSe x S 1– x /CdS alloyed quantum dots/TiO 2 , AgTaO 3 , perylene diimide/graphene- g -C 3 N 4 , P-doped ZnIn 2 S 4 , MCo 2 O 4−δ (M = Zn, Ni, Cu), and PtRu/TiO 2 .…”