Preparation and characterization of a novel double-walled Na 2 (TiO)SiO 4 nanotube by hydrothermal process with CTAB as an assistant

Significantly Improving N2 Selectivity and H2O Resistance by Confining Mn into TiO2 Nanotubes for Low-Temperature Selective Catalytic Reduction of NO with NH3

“…For the MnTiO x -NP catalyst, one can observe a representative IV curve featuring a type H1 hysteresis loop, which suggested the presence of a uniform mesoporous structure formed by particle accumulation . However, MnTiO x -NT catalyst exhibited an evident IV curve with a type H3 hysteresis loop, often linked to the trait of crevice-shaped pores resulting from the curling-up of nanosheets . It is evident from Table that MnTiO x -NT possesses a higher specific surface area, pore volume, and pore diameter.…”

“…22 However, MnTiO x -NT catalyst exhibited an evident IV curve with a type H3 hysteresis loop, often linked to the trait of crevice-shaped pores resulting from the curling-up of nanosheets. 23 It is evident from Table 1 that MnTiO x -NT possesses a higher specific surface area, pore volume, and pore diameter. With an increase in the manganese added level from 5% to 10%, the specific surface area shows an increase from 189.17 to 222.74 m 2 /g, accompanied by an expansion in pore volume from 0.40 to 0.52 cm 3 /g and a growth in the pore diameter from 6.35 to 7.08 nm.…”

Engineering 3D structure Mn/YTiOx nanotube catalyst with an efficient H2O and SO2 tolerance for low-temperature selective catalytic reduction of NO with NH3

“…TiO 2 -NT and 1%YTiO x showed typical IV curves with hysteresis loops of type H3 assigned to the characterization of crack-like pores resulting from the curling-up of nanosheets. 24 Moreover, the unique hollow tubular structure of TiO 2 -NT led to a high specific surface area of 250.50 m 2 g −1 and pore volume of 1.38 cm 3 g −1 . For 3%YTiO x and 5%YTiO x , the isotherms similarly exhibited a typical IV curve, but with the loop at a relative pressure above 0.4, suggesting the existence of mesopores from stacked nanosheets.…”

Vibrational Spectral Analysis of Natisite (Na2TiSiO5) and its Structure Evolution in Water and Sulfuric Acid Solutions

“…In the last decades, numerous microporous or layered titanosilicates containing the mixed polyhedral framework built by tetrahedral Si fragments and Ti units with six-fold or rarely five-fold coordination have been synthesized due to their interesting properties [ 1 , 2 , 3 ]. As a member of the titanosilicate materials, Na 2 TiSiO 5 is attracting increasing attention, and it has three polymorphs [ 4 ].…”

“…By adjusting the molar ratios of Na 2 O/TiO 2 and TiO 2 /SiO 2 in the hydrothermal process, Stanislav Ferdov selectively synthesized natisite with truncated bipyramidal, disk-shaped, and pillowlike microstructures [ 22 , 23 ], in which SiO 2 was used as the silicon source [ 23 , 24 ]. A double-walled natisite nanotube was prepared by an alkaline hydrothermal process with cetyltrimethylammonium bromide as an assistant [ 2 ]. Previous studies have shown that the hydrothermal method is a reasonable approach to prepare natisite with controllable morphology.…”