Preparation of hierarchically structured porous aluminas by a dual soft template method

Correlation between Structural and Catalytic Properties of Copper Supported on Porous Alumina for the Ethanol Dehydrogenation Reaction

“…The well-defined bimodal pore-size distribution observed for all the samples is consistent with the dual template synthesis method. [7] The macropore (1-50 mm) and mesopore (4-10 nm) families are related to the oil droplets and the micelles, respectively.T hese features provide evidence for the additive contributions of soft templating to the total porosityo f the highly porous alumina support.…”

“…[7] This synthesis involved the conversion to ag el of ac olloidal suspension consisting of emulsified droplets of decahydronaphthalene and micelles of Pluronic P123 surfactant (HO(CH 2 CH 2 O) 20 20 H). The sol was obtained by adding n-pentanol as cosurfactant, aluminum isopropoxide, and nitric acid (65 wt %) to an aqueous solution of Pluronic surfactant (0.015 m)a nd stirring for 5h.S ubsequently, emulsification was achieved by adding 60 wt %o fd ecahydronaphthalene, under mechanical stirring for 5min.…”

“…For most advanced applications, the control of both large and small pores is necessary.I no ur earlier work, ac ombination of the sol-gel methoda nd dual soft templates (oil droplets and block copolymer micelles)e nabled us to produce three-dimensionally ordered alumina samples with randomly positioned macro/mesopores. [7,8] In this study,t he hierarchical porousa lumina prepared by the dual soft-template method [7] is evaluated as ac atalysts upport for designing new copper-based catalysts for the ethanol dehydrogenation reaction. It has already been reported that the use of supported copper catalysts for this reactionc an lead to the productiono fs ubstances with high added value, such as H 2 ,a cetaldehyde, and ethyl acetate.…”

“…In our previousw ork, the general morphology of the porous network was studied by using low-magnification microscopy. [7,8] Conclusive information concerning the chemical environment of copper species on the alumina support was obtained from the short-range order analysis conducted by XAS. The Cu K-edge X-ray absorption near edge structure (XANES) spectra and their corresponding first derivatives are shown for the catalysts and for the polycrystalline CuO reference compound in Figure 4(a) and 4(b), respectively.R egardless of the copper loading, the spectra of the xCu/Alc atalysts were very similar, but different from the spectrum of the polycrystalline CuO reference.…”

Synthesis of 3D porous ferromagnetic NiFe2O4 and using as novel adsorbent to treat wastewater

“…Much attention has been paid to fabricate 3D porous materials [14]. For example, infiltration and chemical vapor deposition (CVD) are used to synthesize 3D ordered microporous carbon by using silica monolith as a hard template [15], sol-gel method is used to synthesize macroporous aluminas by using a dual soft template [16,17], colloidal crystal templating method to prepare three-dimensionally ordered macroporous MFe 2 O 4 (M = Mn, Ni, Zn, Co) [18], and Gao et al synthesize mesoporous spinel NiFe 2 O 4 with well-defined pore size (2.5-16.2 nm) by oxalate decomposition process for adsorption acid orange 7 [19]. However, the preparation procedure of 3D porous materials is always template methods, which include the process of infiltration and templates removal [20].…”