Self-assembled 3D flower-like perovskite PbTiO₃ nanostructures and their application in the catalytic oxidation of CO

Abstract

3D flower-like PbTiO 3 nanostructures self-assembled with (101) nanosheets have been realized by the hydrothermal treatment of the mixture of the lead and titanium hydroxides under the effect of high KOH concentration. The layered K 2 Ti 6 O 13 formed in situ under the effect of the high KOH concentration plays an important role in the crystallization of the primary PbTiO 3 nanosheets and the further self-assembly of the 3D flower-like perovskite PbTiO 3 nanostructures. The self-assembled 3D flower-like perovskite PbTiO 3 nanostructures express good mesoporous structures and high specific surface area. In consequence, the 3D flower-like perovskite PbTiO 3 nanostructures as supports show excellent ability to enhance the catalytic activity of Pt. Over the Pt/PbTiO 3 nanoflowers, the CO instantaneously completely converts to CO 2 at a very low temperature of ca. 107 C facilitating the catalytic purification of the automotive exhaust produced in the cold-start period.

Research progress of the preparation of perovskite oxide catalysts and their catalytic performances for soot combustion

“…The hydrothermal synthesis process of the single-crystalline tetragonal perovskite PbTiO 3 (a) and SEM (b~f) and TEM (g) images for three morphologies of Ti-based perovskite oxide catalysts [78][79][80][81] (color online).…”

Facile One-Step Flame Synthesis of La1−xSrxMnO3 Nanoparticles for CO Catalytic Oxidation

“…x Fe x O 3-δ nanoparticles perovskites by the flame synthesis, and the results showed that oxygen evolution activity was improved. However, most of the currently reported highefficiency perovskite catalysts for CO oxidation are synthesized in traditional ways, such as coprecipitation [17], hydrothermal [18], and sol-gel synthesis [19]. And the obtained perovskite catalysts need to be calcined at high temperatures, leading to complex operations and low productivity.…”

A facile hydrothermal method to synthesize Sb2S3/Sb4O5Cl2 composites with three-dimensional spherical structures

“…[1][2][3][4][5][6][7][8] With one-dimensional (1D) structure-based materials as building units, a variety of self-assembling morphologies such as dandelion-like, 9 ower-like, [10][11][12] urchin-like, 13 peanut-like structures 14 and tube-like structures 15 have been reported. Most of these studies usually rely on spherical superstructures prepared with hydrothermal or solvothermal routes.…”

“…Over the past several years, due to the controllable size, various types of unique morphology and shape-dependent properties, materials with three-dimensional structures synthesized by large-scale self-assembly of micro-and nanostructured building components have become a hot topic of material preparation. [1][2][3][4][5][6][7][8] With one-dimensional (1D) structure-based materials as building units, a variety of self-assembling morphologies such as dandelion-like, 9 ower-like, [10][11][12] urchin-like, 13 peanut-like structures 14 and tube-like structures 15 have been reported. Most of these studies usually rely on spherical superstructures prepared with hydrothermal or solvothermal routes.…”

“…Most of these studies usually rely on spherical superstructures prepared with hydrothermal or solvothermal routes. [9][10][11][12] However, due to the high temperature and surfactants, severe preparation conditions result in high production costs for the oriented growth of building units requirements. As a result, the development of mild and surfactant-free methods for preparing materials with three-dimensional spherical structures is necessary but remains a challenge.…”