Designing Pd-based supported bimetallic catalysts for environmental applications

Abstract

Supported bimetallic nanoparticulate catalysts are an important class of heterogeneous catalysts for many reactions including selective oxidation, hydrogenation/hydrogenolysis, reforming, biomass conversion reactions and many more. The activity, selectivity and stability of these catalysts depend on their structural features including particle size, composition and morphology. In this review, we present important structural features relevant to supported bimetallic catalysts focusing on Pd-based bimetallic systems and recently reported strategies to control them through different synthesis methodologies. Further, we focus on a few reactions that are relevant to environmental catalysis i.e. (a) CO oxidation, (b) hydrocarbon oxidation, (c) hydrodechlorination and (d) NOx decomposition where Pd-based catalysts are often used successfully. In spite of much progress in these areas, still there is a need for more advanced catalytic technologies to address the grand challenges like environmental remediation. Some of the recent advances in the design of bimetallic catalysts were made because of the combined efforts of material scientists, spectroscopists, microscopists, catalysis chemists and engineers through state-of-the-art characterisation methodologies, mechanistic investigations and structure-activity correlations. This review is aimed at inspiring scientists to rationally design catalysts for a green and sustainable future.

Liquid phase hydrogenation of CO2 to formate using palladium and ruthenium nanoparticles supported on molybdenum carbide

“…33,[82][83][84] Recently, we reported supported bimetallic RuPd nanoparticles for the hydrodeoxygenation of levulinic acid to g-valerolactone with enhanced stability. 61,85 Two Pd catalysts were prepared to improve the stability of Pd/Mo 2 C catalyst based on the two approaches mentioned above. 1% Pd/Mo 2 C-Sy was prepared using homemade b-Mo 2 C and a bimetallic 1% RuPd/Mo 2 C (commercially sourced Mo 2 C) and both these catalysts were tested for catalytic activity and stability.…”

Cinnamyl Alcohol Oxidation Using Supported Bimetallic Au–Pd Nanoparticles: An Optimization of Metal Ratio and Investigation of the Deactivation Mechanism Under Autoxidation Conditions

“…Bimetallic Au-Pd catalysts have been well studied to date [28][29][30][31]. Indeed, catalytic performance is a result of numerous variables that one needs to consider including structure and composition of nanoparticles and their behaviour in relation to support, reactants, reaction conditions and many other factors.…”

Synthetic Strategies of Supported Pd-Based Bimetallic Catalysts for Selective Semi-Hydrogenation of Acetylene: A Review and Perspectives

“…The former is the most widely used catalyst in the production of bulk, fine chemicals, and fuels in industry, involving reactions such as hydrogenation, dehydrogenation, hydrotreating, oxidation, deNOx reactions, Fischer–Tropsch synthesis, ammonia synthesis, etc. [ 61 , 62 ] Supports of catalysts can provide a large specific surface area, enhance the stability of the supported metals via anchoring [ 63 ], modify the electronic structure of supported metals by strong metal–support interaction (SMSI) [ 64 , 65 ], as well as provide a synergistic catalysis effect with supported metals [ 66 , 67 ], etc. For the fabrication of high-performance Pd-based bimetallic catalysts, it is necessary to design suitable preparation methods based on the understanding of various preparation strategies.…”