Nanocatalysis on Supported Oxides for CO Oxidation

Abstract

Active gold and palladium nanoparticles supported on a variety of oxides (CeO 2 , ZrO 2 , Al 2 O 3 , SiO 2 , MgO and ZnO) were synthesized using laser vaporization and microwave irradiation methods. The catalytic activities for CO oxidation on the nanoparticle catalysts were evaluated and compared among different oxide supports. The effect of shape on the catalytic activity is demonstrated by comparing the activities of the Au and Pd catalysts deposited on MgO nanocubes and ZnO nanobelts. The Au/ CeO 2 nanoparticles deposited on MgO nanocubes exhibit high catalytic activity and stability. The enhanced catalytic activity is attributed to the presence of a significant concentration of the corner and edge sites in MgO nanocubes. The Au-and Pd-doped Mn 2 O 3 nanoparticles show promising results for the low temperature CO oxidation. Several approaches for incorporating the Au and Pd nanocatalysts within mesoporous oxide supports are presented and discussed.

Sustainable Preparation of Supported Metal Nanoparticles and Their Applications in Catalysis

“…CeO 2 ) metal oxides. Among the metal oxides, silica, [32][33][34][35] alumina, [32,34,[36][37][38] , titania, [34,35,[39][40][41][42] ceria [32,34,36,43] and zirconia [36,37,44] are the most commonly employed supports. Superparamagnetic oxides (e.g.…”

“…[32,65] They have also prepared capped Au and Pd nanoparticles on metal oxides using polyethylene glycol and poly(N-vinyl-2-pyrrolidone) as protective polymers prior to microwave-heating to further stabilise the nanoparticles from agglomeration. In this way, the obtained metal nanoparticles were better dispersed and had a narrower particle size distribution, which in turn increased their activity for the investigated application (e.g.…”

“…They claimed that fast and uniform heating (due to high dielectric constants of PEG and PVP) achieved under microwave irradiation allows a quicker reduction of the metal precursor on the support. [32,65] We recently reported the preparation of a range of metallic nanoparticles on an ordered mesoporous silica SBA-12 structure. [66] The metallic Au, Ag and Pd nanoparticles were prepared in a very short time (< 2 min) under microwave irradiation of a solution of the metal salt precursor in ethanol/water or ethanol/acetone mixtures without the need of additional reductant.…”

“…Nd-YAG) and subsequent controlled deposition on the surface of the support under well-defined conditions of temperature and pressure. [32,69] Savastenko et al…”

Nanocatalysis: Academic Discipline and Industrial Realities

“…Today, activity, selectivity, durability, and recoverability can be influenced owing to the advances in nanoscience [16,17,87]. The size, shape, and surface compositions of nanocatalysts are designed and synthesized in a more precise way by adjusting the reaction conditions, such as reaction time, temperature and reactant concentrations [88,89].…”