Direct synthesis of a mesoporous TiO2–RuO2 composite through evaporation-induced polymeric micelle assembly

2014 ◽  
Vol 16 (22) ◽  
pp. 10425-10428 ◽  
Author(s):  
Bishnu Prasad Bastakoti ◽  
Rahul R. Salunkhe ◽  
Jinhua Ye ◽  
Yusuke Yamauchi
Keyword(s):  
Pore Size ◽  
Triblock Copolymer ◽  
Direct Synthesis ◽  
Polymeric Micelle ◽  
Mesoporous Tio2 ◽  
Spherical Micelles ◽  
Uniform Pore Size

Evaporation-induced assembly of spherical micelles made of an asymmetric triblock copolymer enables the fabrication of a mesoporous TiO2–RuO2 composite with a uniform pore size.

Polymeric micelle assembly for the direct synthesis of functionalized mesoporous silica with fully accessible Pt nanoparticles toward an improved CO oxidation reaction

2014 ◽  
Vol 50 (65) ◽  
pp. 9101-9104 ◽  
Author(s):  
Bishnu Prasad Bastakoti ◽  
Yunqi Li ◽  
Nobuyoshi Miyamoto ◽  
Noelia M. Sanchez-Ballester ◽  
Hideki Abe ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Co Oxidation ◽  
Oxidation Reaction ◽  
Triblock Copolymer ◽  
Polymeric Micelles ◽  
Direct Synthesis ◽  
Pt Nanoparticles ◽  
Polymeric Micelle ◽  
Functionalized Mesoporous Silica ◽  
Co Oxidation Reaction

Pt-decorated mesoporous silica is directly prepared through a polymeric micelles assembly approach using an asymmetric triblock copolymer.

Facile synthesis of mesoporous TiO2 film templated by block copolymer for photocatalytic applications

2021 ◽  
Author(s):  
Olufemi Olatidoye ◽  
Daria Thomas ◽  
Bishnu Bastakoti
Keyword(s):  
Thin Film ◽  
Block Copolymer ◽  
Ethylene Oxide ◽  
Tio2 Thin Film ◽  
Polymeric Micelles ◽  
Polymeric Micelle ◽  
Mesoporous Tio2 ◽  
Facile Synthesis ◽  
Vinyl Pyridine ◽  
Photocatalytic Applications

A facile synthesis of a mesoporous TiO2 thin film is reported using poly(styrene-2-vinyl pyridine-ethylene oxide) polymeric micelle as a synthetic template. As the Ti precursor strongly binds with polymeric micelles...

Pore size and surface charge control in mesoporous TiO2 using post-grafted SAMs

2010 ◽  
Vol 12 (7) ◽  
pp. 1473 ◽  
Author(s):  
Dereje Hailu Taffa ◽  
Murugavel Kathiresan ◽  
Lorenz Walder ◽  
Britta Seelandt ◽  
Michael Wark
Keyword(s):  
Surface Charge ◽  
Pore Size ◽  
Mesoporous Tio2 ◽  
Charge Control

Dehydrogenation of Propane to Propene over Mesoporous ZrO2-Supported VCrO Catalysts

2014 ◽  
Vol 1008-1009 ◽  
pp. 290-294
Author(s):  
Bao Agula ◽  
Si Qin Dalai ◽  
Yue Chao Wu
Keyword(s):  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Mesoporous Structure ◽  
Molar Ratio ◽  
Impregnation Method ◽  
Size Distributions ◽  
Tem Analysis ◽  
Surfactant Assisted ◽  
Uniform Pore Size

Mesoporous ZrO2with narrow mesopore size distributions has been prepared by the surfactant-assisted method of nanoparticle assembly. A series of VCrO/ZrO2catalysts with different V/Cr molar ratio (0.3, 0.6, 1.0, 1.3 and 1.6) were prepared by the wetness impregnation method and characterized by XRD, N2adsorption and TEM techniques. N2adsorption and TEM analysis revealed that the surfactant-assisted method prepared VCrO/ZrO2catalysts have wormhole-like mesoporous structure with uniform pore size distribution. VCrO/ZrO2catalysts have been applied for direct dehydrogenation of propane to propene. The optimistic catalyst was V/Cr-0.6 with highest yield of 41.7% the corresponding conversion of propane was 44.1% and selectivity to propene was 94.5% at 550 °C.

scholarly journals Hierarchical H-ZSM5 zeolites based on natural kaolinite as a high-performance catalyst for methanol to aromatic hydrocarbons conversion

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Ahmad Asghari ◽  
Mohammadreza Khanmohammadi Khorrami ◽  
Sayed Habib Kazemi
Keyword(s):  
Pore Size ◽  
Aromatic Hydrocarbons ◽  
High Performance ◽  
Low Cost ◽  
Direct Synthesis ◽  
Fixed Bed ◽  
Methanol Conversion ◽  
Catalytic Performance ◽  
Fixed Bed Reactor ◽  
Good Prospect

AbstractThe present work introduces a good prospect for the development of hierarchical catalysts with excellent catalytic performance in the methanol to aromatic hydrocarbons conversion (MTA) process. Hierarchical H-ZSM5 zeolites, with a tailored pore size and different Si/Al ratios, were synthesized directly using natural kaolin clay as a low-cost silica and aluminium resource. Further explored for the direct synthesis of hierarchical HZSM-5 structures was the steam assisted conversion (SAC) with a cost-effective and green affordable saccharide source of high fructose corn syrup (HFCS), as a secondary mesopore agent. The fabricated zeolites exhibiting good crystallinity, 2D and 3D nanostructures, high specific surface area, tailored pore size, and tunable acidity. Finally, the catalyst performance in the conversion of methanol to aromatic hydrocarbons was tested in a fixed bed reactor. The synthesized H-ZSM5 catalysts exhibited superior methanol conversion (over 100 h up to 90%) and selectivity (over 85%) in the methanol conversion to aromatic hydrocarbon products.

scholarly journals Preparation of an Ultrafiltration (UF) Membrane with Narrow and Uniform Pore Size Distribution via Etching of SiO2 Nano-Particles in a Membrane Matrix

Membranes ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 150
Author(s):  
Bushra Khan ◽  
Sajjad Haider ◽  
Rooha Khurram ◽  
Zhan Wang ◽  
Xi Wang
Keyword(s):  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Nano Particles ◽  
Coagulation Bath ◽  
Inversion Method ◽  
Permeate Flux ◽  
Membrane Matrix ◽  
Etched Membrane ◽  
Uniform Pore Size

The UF membrane with a narrow and uniform pore size distribution and a low tendency to foul has significant applications in wastewater treatment. A major hindrance in the preparation of the UF membrane with these features is the lack of a scalable and economical membrane fabrication method. Herein, we devise a new strategy to prepare a high-quality polyvinylidene fluoride/polymethyl acrylate/cellulose acetate (PVDF/PMMA/CA) blend UF membrane via a combination of the etching mechanism with the traditional Loeb–Sourirajan (L-S) phase inversion method. Different concentrations of silicon dioxide (SiO2) nanoparticles (NP) in the membrane matrix were etched by using a 0.2 M hydrofluoric acid (HF) solution in a coagulation bath. This strategy provided the membrane with unique features along with a narrow and uniform pore size distribution (0.030 ± 0.005 μm). The etched membrane exhibits an increase of 2.3 times in pure water flux (PWF) and of 6.5 times in permeate flux(PF), with a slight decrease in rejection ratio (93.2% vs. 97%) when compared to than that of the un-etched membrane. Moreover, this membrane displayed outstanding antifouling ability, i.e., a flux recovery ratio (FRR) of 97% for 1000 mg/L bovine serum albumin (BSA) solution, a low irreversible fouling ratio of 0.5%, and highly enhanced hydrophilicity due to the formation of pores/voids throughout the membrane structure. The aforementioned features of the etched membrane indicate that the proposed method of etching SiO2 NP in membrane matrix has a great potential to improve the structure and separation efficiency of a PVDF/PMMA/CA blend membrane.

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