Preparation of Hollow CuO@SiO2 Spheres and Its Catalytic Performances for the NO + CO and CO Oxidation

Abstract

The hollow CuO@SiO2 spheres with a mean diameter of 240 nm and a thin shell layer of about 30 nm in thickness was synthesized using an inorganic SiO2 shell coating on the surface of Cu@C composite that was prepared by a two-step hydrothermal method. The obtained hollow CuO@SiO2 spheres were characterized by ICP-AES, nitrogen adsorption-desorption, SEM, TEM, XRD, H2-TPR, CO-TPR, CO-TPD and NO-TPD. The results revealed that the hollow CuO@SiO2 spheres consist of CuO uniformly inserted into SiO2 layer. The CuO@SiO2 sample exhibits particular catalytic activities for CO oxidation and NO + CO reactions compared with CuO supported on SiO2 (CuO/SiO2). The higher catalytic activity is attributed to the special hollow shell structure that possesses much more highly dispersed CuO nanocluster that can be easy toward the CO and NO adsorption and the oxidation of CO on its surface.

Multiple Cores‐Shell Structured Cu@SiO2 Ultrathin Leaf‐Shaped Nanocomposite: Facile Fabrication and Excellent Selective Catalytic Hydrogenation Performance

“…Among the studied core‐shell structured nanocatalysts, catalysts with silica or silicate shell are of great interest because of the abundant resource, adjustable surface areas and particle sizes, tailorable pore sizes and structures, diverse morphologies, easy functionalization and colloidal stability of silica or silicate ,,. Due to the critical role played by nanoscale copper in some important catalytic reactions such as electrocatalysis, photocatalysis, gas‐phase catalysis, and liquid‐phase catalysis, core‐shell structured nanocatalysts with copper species as single core or multiple cores have received extensive research interest, and several studies have demonstrated their superior catalytic performance compared to traditional supported catalysts ,. However, research on core‐shell structured Cu@SiO 2 nanocatalysts has not progressed much compared to core‐shell structured noble metal/silica nanocatalysts, such as Au@SiO 2 and Ag@SiO 2 .…”

Strategies for Improved Electrochemical CO2 Reduction to Value‐Added Products by Highly Anticipated Copper‐Based Nanoarchitectures

“…From the perspective of particle shape or morphology, the improved ERC could be attributed to the creation of active edges, grain boundaries, and steps. [59] Various morphologies, such as spherical or pseudospherical nanoparticles (NPs), [60][61][62] nanocubes (NCs), [63] nanosheets (NSs), [64] nanowires (NWs), [65][66][67] hollow cages, [68,69] multi-pods, [70] hierarchical structures, [71][72][73] and different polyhedral including cubes, [74][75][76] cuboctahedra, [77] octahedra, [78][79][80] truncated octahedra, [81][82][83] dodecahedra, [84,85] and so forth, have been explored over the years. The conventional NPs form of Cubased electrocatalysts (CuNPs) is expected to preferentially form C2 compounds due to the combination of two critical parameters, i. e. (i) low co-ordination sites and (ii) low crystals facets on the Cu surface.…”

Preparation of CuCrO2 Hollow Nanotubes from an Electrospun Al2O3 Template

“…Platinum (Pt) functionalized NiO hollow tube exhibited remarkable selectivity of C 2 H 5 OH sensing against CO and H 2 gases [32]. The hollow structure of CuO@SiO 2 exhibits excellent catalytic activities toward CO and NO oxidation compared with individual CuO and SiO 2 [33]. Besides, carbon nanotube catalyst could raise the selectivity of H 2 production rather than CO [34].…”