Preparation and Characterization of Mesoporous MoO3/TiO2 Composite with High Surface Area by Self-Supporting and Ammonia Method

Abstract

A mesoporous MoO 3 /TiO 2 composite was prepared from titanate derivative by consecutive self-supporting and ammonia method. All samples were characterized by X-ray Diffraction, N 2 adsorption-desorption, Raman Spectra and Field-Emission Scanning Electron Microscopy. The results showed that mesoporous MoO 3 / TiO 2 composite had a higher surface area (173 m 2 /g) and a better MoO 3 dispersion than that prepared by traditional impregnation (90 m 2 /g). As for hydrodesulfurization tests, mesoporous MoO 3 /TiO 2 composite in this case presented a better catalytic performance, attributed to its high surface area and good dispersion of MoO 3 . It can be found that self-supporting played a key role in preparing mesoporous MoO 3 /TiO 2 composite with high surface area. Additionally, aqueous ammonia could effectively dissolve excess MoO 3 , which helped to obtain mesoporous MoO 3 /TiO 2 composite with better dispersion of MoO 3 .

Molybdenum‐Based Co‐catalysts in Photocatalytic Hydrogen Production: Categories, Structures, and Roles

“…The length of the octahedral MoÀOb ond (non-cross-linkedo xygen) is short. [30][31][32] In the photocatalytic oxidation reaction, selectiveo xidation of Mo active sites has been widely studied,i ncluding dehydrogenation, methanol oxidation, and oxidation of organic pollutants. [28] h-MoO 3 is formed by zigzag chains of MoO 6 octahedrons,w hich are connected to each other through a cis position to form ah exagonal tunnel structure.…”

“…ChemSusChem 2018, 11,3871 -3881 www.chemsuschem.org energy,and other fields. [30][31][32] In the photocatalytic oxidation reaction, selectiveo xidation of Mo active sites has been widely studied,i ncluding dehydrogenation, methanol oxidation, and oxidation of organic pollutants. [33,34] Ma et al report the preparation of aM oO 3 /T iO 2 photocatalyst by using titaniumd ioxide and ammonium molybdate as precursors to enhance the photocatalytic H 2 evolution reaction.…”

NiMo catalysts supported on graphene-modified mesoporous TiO2 toward highly efficient hydrodesulfurization of dibenzothiophene

“…It shows that carbon modification on the surface of supports is also an alternative and effective way besides the conventional methods [20]. To the best of our knowledge, there has been no research reporting on graphene-doped TiO 2 by surface modification in HDS reaction.…”

Preparation of porous MTiO (M = Cr, Mo, or W) composite oxides from a mesostructured material of titanium oxysulfate and surfactant micelles based on a wall ion exchange–calcination method

“…Porous TiO 2 -based composite oxides have gathered much attention for their use as catalysts and supports in photo-catalysis [1][2][3][4] and in the selective catalytic reduction of nitrogen oxide with ammonia [5,6]. These oxides can be prepared by various methods [4,[7][8][9]. For example, a sol-gel method using inorganic precursors and templates [10] produced Cr-Ti mixed oxide with a surface area of 317 m 2 g -1 and a pore diameter of 2.5 nm [7].…”

“…A template free-method was also used for preparation of a mesoporous MoO 3 /TiO 2 composite, which exhibited a surface area of 173 m 2 g -1 and a MoO 3 content of ca. 14 wt% [9]. These synthesis methods of TiO 2 -based composite oxides are well established but were specialized for their respective materials, and no versatile method has been suggested to prepare various composites through a unified procedure.…”