Porous niobia spheres with large surface area: alcothermal synthesis and controlling of their composition and phase transition behaviour

Abstract

Nb2O5, TiO2–Nb2O5, and TiNb2O7 porous spheres with large surface area were synthesized by alcothermal reaction and calcination.

Low-temperature synthesis of porous high-entropy (CoCrFeMnNi)3O4 spheres and their application to the reverse water–gas shift reaction as catalysts

“…23,24 These materials have been called micro/mesoporously architected roundly integrated metal oxides (MARIMOs). The synthetic methodology has also been applied to composite MARIMOs, such as SiO 2 –TiO 2 , 22 TiO 2 –Nb 2 O 5 , 25 and SnO 2 -based composites. 26 Therefore, the solvothermal approach could be used for the synthesis of high-entropy MARIMOs (HE-MARIMO) containing five metals.…”

“…22 The present authors have synthesized a variety of metal-oxide materials with higher-order spherical morphologies composed of numerous nanoscale primary particles via solvothermal methods. [22][23][24][25][26] They exhibited porous structures derived from gaps between the primary particles and high specific surface areas. These features have led to superior catalysts and catalytic supports for various gas-phase reactions.…”

Solvothermal synthesis of hair-like carbon nanotubes onto sub-micron-sized spherical metal oxide catalyst cores

“…As an alternative, we have studied a unique and simple synthesis method to obtain sub-micron-sized spherical porous assemblies consisting of metal oxide nanoparticles using one-pot and single-step solvothermal reactions. 15 For example, MgO, 16 TiO 2 , 17 ZrO 2 , 18,19 Nb 2 O 5 , 20 SnO 2 , 21 and CeO 2 (ref. 22) assemblies were prepared successfully using this process.…”