Synthesis of hierarchical porous silicas with a controlled pore size distribution at various length scales

Coppens, Marc‐Olivier; Sun, Jihong; Maschmeyer, Thomas

doi:10.1016/s0920-5861(01)00386-8

Cited by 81 publications

(52 citation statements)

References 14 publications

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“…[50,51] The relationships can be derived for the 1NN, first nearest neighbors with coordination numbers in cuboctahedral clusters, which assumes the sequence of determined numbers: N = 13, 55, 147, 309, 561…. [51] The metallic copper dispersion (D Cu0 )a fter activation was estimated by using the coordination number (N Cu-Cu )o btained by EXAFS analysis and Equation (2). [15,50,51] The total copper dispersion after activation was calculated considering the amount of Cu 0 and Cu + on the catalyst surface, according to Equation (3), where X Cu0 and X Cu + are the molar fractions of Cu 0 and Cu + obtained by EXAFS speciation (Table 3).…”

Section: Characterization Of the Catalystsmentioning

confidence: 99%

“…[1] In this general context, hierarchical porous materials used as supports are very attractive for the preparation of heterogeneous catalysts. Precise control of the porous structure at different length scales can not only reduce the limitation of mass transport to the active sites, [2,3] buta lso enable the formation of well-dispersed supported catalysts with high metallicsurfacea reas. [4] Among catalytic supports, inexpensive alumina has been extensively used in different catalytic applications, providing aw ide range of textural features, as well as thermala nd mechanical stability.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2015

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Carbon nanofibers (CNFs) were functionalized with aryl sulfonic acid groups using in situ diazonium coupling. The use of diazonium coupling yielded an acidic carbon material, in which the introduced acidic groups are readily accessible to the triglyceride substrate. The material is an efficient catalyst for the transesterification of triolein and methanol, outperforming conventional sulfonated carbons in both stability and activity per acid site. Upon comparing CNFs with varying degrees of functionalization, a linear correlation between sulfonic acid sites and catalytic performance was found.

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Section: Characterization Of the Catalystsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2015

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“…Hence, it is an important approach to control the FTS product distribution via suitable catalyst using HPMS as a support. Coppens et al [9] pointed out that hierarchically structured porous supports are of great importance to catalysis because the pore texture at different length scales can be beneficial to reduce the transport limitations of catalyst.…”

Section: Introductionmentioning

confidence: 99%

Pore size-controlled synthesis of molecular sieves and theirs difference in catalytic properties for Fischer–Tropsch synthesis

Wang

Liu

et al. 2015

Appl Petrochem Res

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Three molecular sieves with different pore size distributions, i.e., mesopore (Al-MCM-41), micropore (ZSM-5) and hierarchical pore (HPMS), were synthesized under hydrothermal condition and characterized by N 2 adsorption-desorption. Three cobalt-loaded catalysts, i.e., Co/Al-MCM-41, Co/ZSM-5 and Co/HPMS, were prepared by impregnating cobalt nitrate onto three molecular sieves, respectively, and characterized by X-ray diffraction, scanning electron microscopy, and H 2 temperature-programmed reduction (H 2 -TPR). The H 2 -TPR results show that the reduction temperature of Co/HPMS is lower than those of Co/Al-MCM-41 and Co/ZSM-5, indicating that Co/HPMS has a better catalytic activity. The selectivity of three catalysts for Fischer-Tropsch synthesis was evaluated in a fixed-bed reactor, and the results show that the pore structure is of important influence on the product distribution. Co/HPMS exhibits significantly good selectivity of C 5-11 and C 12-18 hydrocarbons (up to 25.6 and 27.7 %, respectively), much higher than those of Co/Al-MCM-41 and Co/ZSM-5, due to the confinement effect of micropore and good diffusibility for long-chain hydrocarbons of mesopore in Co/HPMS.

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“…Recently, a large number of studies were carried out with solid acids for the acylation of anisole in order to make the process greener [4][5][6][7][8][9][10]. Also recent is the amount of emphasis placed on the synthesis and application of meso-/ macroporous catalysts for fine chemical synthesis [11][12][13][14][15]. Zeolites, with their shape selective properties and good regenerability, have been found to be possible alternatives to liquid acids for acylation of aromatic compounds [16][17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Efficient Acylation of Anisole over Hierarchical Porous ZSM‐5 Structure

et al. 2010

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Friedel-Crafts acylation is one of the most important methods to prepare aromatic ketones which are used in manufacturing fine and speciality chemicals, as well as pharmaceuticals. Herein, we report an efficient and convenient procedure for the acylation of anisole with acetic anhydride, using a hierarchical porous ZSM-5 catalyst. The hierarchical porous ZSM-5 catalyst was synthesized using styrene butadiene rubber (SBR) as macroporous template. The catalysts were characterized for their structural features by using XRD, SEM, and FT-IR analyses. The effect of temperature, molar ratio, and catalyst weight on the acylation of anisole was studied in detail. The reaction parameters such as anisole-to-acetic anhydride mole ratio, catalyst weight, and reaction temperature were optimized as 5:1, 0.2 g, and 70°C, respectively. The method described here is environmentally benign and replaces the conventional catalyst by a highly active and reusable catalyst.

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Synthesis of hierarchical porous silicas with a controlled pore size distribution at various length scales

Cited by 81 publications

References 14 publications

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

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

Pore size-controlled synthesis of molecular sieves and theirs difference in catalytic properties for Fischer–Tropsch synthesis

Efficient Acylation of Anisole over Hierarchical Porous ZSM‐5 Structure

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