Poly(ethylene oxide)–Poly(butylene oxide)–Poly(ethylene oxide)-Templated Synthesis of Mesoporous Alumina: Effect of Triblock Copolymer and Acid Concentration

Abstract

Mesoporous alumina was synthesized via a one-pot self-assembly of aluminum isopropoxide and poly(ethylene oxide)-poly(butylene oxide)-poly(ethylene oxide) triblock copolymer in an acidic ethanol solution. The effects of the polymer concentration and nitric acid concentration, independently, on the adsorption properties (such as surface area, pore volume, microporosity, mesoporosity, and pore width) were studied. An increase in the specific surface area and the pore volume was seen for the samples containing a polymer/aluminum isopropoxide wt. ratio up to 0.71 and a polymer/acid wt ratio of 0.88. Titania isopropoxide was also added to the synthesis to illustrate the extension of this approach to alumina-based mixed metal oxides.

Preparation and pore structure stability at high temperature of silicon-doped ordered mesoporous alumina

“…This method generally includes preparing the aluminum precursor solution and an evaporation-induced self-assembly (EISA) process to form the ordered surfactant-inorganic hybrid before the thermal removal of the template, and the key issue is to control the hydrolysis-condensation behavior of the aluminum precursor. 2 However, the pore structure stability of the nal product depends highly on the sol-gel parameters like water and acid concentration, [11][12][13][14] as well as the choice of the solvent, 15 surfactant, 3,16,17 swelling agent, 18 carboxylic complexing agents, 12,19 etc. Niesz et al 11 reported the rst example of sol-gel synthesized OMA with the triblock copolymer Pluronic P123 (EO 20 PO 70 EO 20 , EO ¼ ethylene oxide; PO ¼ propylene oxide) as the template, although the framework was amorphous, by controlling the hydrolysis-condensation rate of the aluminum precursor (aluminum tert-sec-butoxide (AlsBu)) with proper content of hydrochloric acid and conducting the EISA process at 40 C under a N 2 ow.…”

Highly sensitive determination of lead(ii) and cadmium(ii) by a large surface area mesoporous alumina modified carbon paste electrode

“…[18][19][20] Many approaches have been used to synthesize large surface area mesoporous alumina with the P123 as a structuredirecting agent. 21,22 The high surface area alumina are prepared via mainly controlled the Al 3+ hydrolysis speed by regulating pH value and reducing the concentrations of anions in the reaction system to disturb the self-assembly process. [23][24][25] In process of the synthesis, the added aniline could not only regulate the pH value of the reaction system to control the Al 3+ hydrolysis speed, but also could protect the aluminum ions at the organic-inorganic interface from being affected by the chloride ions of the reaction system.…”

Strategy to produce highly loaded alumina supported CoMo-S catalyst for straight run gas oil hydrodesulfurization

“…In addition, periodic mesostructure over alumina can be difficult to maintain during template extraction [29] and wormhole-like porosity is often obtained [19][20][21][22][23]. Evaporation Induced Self Assembly route is however reported as efficient to produce Organized Mesostructured Alumina (OMA) [30,31], with some flexibility on the inorganic network composition [32,33] and pore structure characteristics [33][34][35]. With pore sizes in the mesopore range and high surface areas, templated alumina are good candidates as support for catalytic applications.…”