Highly active and selective AlSBA-15 catalysts for the vapor phase tert-butylation of phenol

Vinu, Ajayan; Devassy, Biju M.; Halligudi, S.B.; Böhlmann, Winfried; Hartmann, Martin

doi:10.1016/j.apcata.2004.11.031

Cited by 84 publications

(57 citation statements)

References 38 publications

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“…Incorporation of heteroatoms such as Cu, Zn, Al, B, Ga, Fe, Cr, Ti, V and Sn into the mesoporous silica framework has been widely investigated [53][54][55][56][57][58][59][60][61][62][63][64][65][66][67][68][69][70][71]. In addition, methodology to prepare mesoporous silica via the template synthesis has been extended to the synthesis of various mesoporous metal oxides [72][73][74][75][76][77][78][79][80][81][82][83][84][85] such as TiO 2 , Ta 2 O 5 , Nb 2 O 5 , ZrO 2 , Al 2 O 3 , and V 2 O 5 , as well as the synthesis of mesoporous aluminophosphate [86][87][88][89].…”

Section: Introductionmentioning

confidence: 99%

Immobilization of Biomolecules on Mesoporous Structured Materials

Vinu

Gokulakrishnan

Mori

et al. 2007

Bio‐inorganic Hybrid Nanomaterials

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Various functional systems have been developed using artificially constructed structures and synthesized compounds, and the nanotechnology based on them has recently received much attention. However, current nanoscale technologies are still highly inferior to those seen in natural systems. The efficiency of the energy conversion that occurs in mitochondrial and photosynthetic systems far exceeds that obtained in artificial systems. A dog can smell and a bat can hear far more sensitively than most artificial sensors. The information processing exhibited by the brain and nervous systems is much more sophisticated than that exhibited by current computers. Nature developed superior nanotechnologies to our own several billion years ago. Therefore, the use of biomaterials for the development of various functional systems can be a very practical approach to reaching several goals in current nanotechnologies.Unfortunately, biomolecules in most cases give their best performance under ambient conditions and are not mechanically and thermally strong enough to be used in harsh conditions. In order to overcome such difficulties, hybridization of biomolecules with supporting materials such as lipid assemblies, polymers and inorganic materials has been proposed to attain both biological functions and mechanical stability . Biomolecules are frequently immobilized on silica supports through a sol-gel process. As advanced silica structures, mesoporous silica molecular sieves and related materials have received much attention as inorganic supports for biomolecules [31][32][33][34][35][36][37][38][39][40]. Mesoporous silica materials are chemically and mechanically stable and resistant to microbial attack. In addition, chemical modification to introduce organic functional groups to the inner silica pore wall is highly possible. Outstanding properties of the mesoporous structure also lie in their high specific surface area and huge specific pore volume, which are definitely advantageous for the efficient accommodation of biomolecules. In addition, the narrow pore size distribution could provide reliable immobilization of biomolecules. According to the j113 Bio-inorganic Hybrid Nanomaterials. Edited

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Section: Introductionmentioning

confidence: 99%

Immobilization of Biomolecules on Mesoporous Structured Materials

Vinu

Gokulakrishnan

Mori

et al. 2007

Bio‐inorganic Hybrid Nanomaterials

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“…However, the pore sizes of these zeolites are too small to form 2, 4-di-TBP and 2, 4, 6-tri-TBP. Although mesoporous materials such as Al-MCM-41, Al-MCM-48, Al-SBA-15 and Al-TUD are used in the alkylation reaction [10][11][12][13][14][15][16][17], the conversion of phenol is lower than that achieved over zeolite beta and zeolite Y, and the selectivity to 2, 4-di-TBP is also low. It is well known that the pore walls of conventional mesoporous materials are amorphous, leading to weak acidity and limitation of use in the alkylation reaction.…”

Section: Introductionmentioning

confidence: 99%

“…Catalysts for this reaction include Lewis acids [1] (such as AlCl 3 and BF 3 ), Brønsted acids [2] (such as H 3 PO 4 , H 2 SO 4 , HF, HClO 4 ), cation exchange resins [3], metal oxides [4], zeolite [5][6][7][8][9] and mesoporous aluminosilicate materials [10][11][12][13][14][15][16][17], etc. Based on the intensity of acidity, the distribution of products is different.…”

Section: Introductionmentioning

confidence: 99%

Alkylation of Phenol with tert-Butanol Catalyzed by Mesoporous Material with Enhanced Acidity Synthesized from Zeolite MCM-22

Song

Guan

et al. 2008

Catal Lett

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Using zeolite MCM-22 as source and cetyltrimethylammonium bromide (CTAB) as template, mesoporous material denoted as M-MCM-22 with enhanced acidity has been synthesized and characterized by XPD, FT-IR, N 2 adsorption-desorption, 27 Al-MAS NMR, IR spectra of pyridine adsorption, and NH 3 -TPD techniques, etc. The catalytic performance of M-MCM-22 was tested in alkylation of phenol with tert-butanol, indicating that M-MCM-22 showed highly and steadily catalytic properties. The highest conversion of phenol could be achieved at 418 K, while the highest selectivity to 2, 4-di-TBP was obtained at 398 K. It is found that high temperature is advantageous to form 4-TBP, whereas low weight hourly space velocity (WHSV/h -1 ) is helpful for both conversion of phenol and selectivity to 2,4-DTBP. It is also shown that high ratio of tert-butanol/phenol is beneficial for obtaining high conversion of phenol and selectivity to 2,4-di-TBP.

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“…Nanoporous materials have attracted significant attention owing to their interesting textural parameters [16][17][18][19][20][21][22][23][24][25][26][27][28][29], which make them an excellent support for the fabrication of nanoparticles. Several reports on the fabrication of transition-metal-oxide-supported nanoporous materials are available in the literature [30][31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Fabrication and textural characterization of nanoporous carbon electrodes embedded with CuO nanoparticles for supercapacitors

Prasad

Dhawale

Thiripuranthagan

et al. 2011

Science and Technology of Advanced Materials

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We introduce a novel strategy of fabricating nanoporous carbons loaded with different amounts of CuO nanoparticles via a hard templating approach, using copper-containing mesoporous silica as the template and sucrose as the carbon source. The nature and dispersion of the CuO nanoparticles on the surface of the nanoporous carbons were investigated by x-ray diffraction (XRD), high-resolution scanning electron microscopy (HRSEM) and high-resolution transmission electron microscopy (HRTEM). XRD results reveal that nanoporous carbons with embedded CuO nanoparticles exhibit a well-ordered mesoporous structure, whereas the nitrogen adsorption measurements indicate the presence of excellent textural characteristics such as high surface area, large pore volume and uniform pore size distribution. The amount of CuO nanoparticles in the nanochannels of the nanoporous carbon could be controlled by simply varying the Si/Cu molar ratio of the mesoporous silica template. Morphological characterization by SEM and TEM reveals that high-quality CuO nanoparticles are distributed homogeneously within the nanoporous carbon framework. The supercapacitance behavior of the CuO-loaded nanoporous carbons was investigated. The material with a small amount of CuO in the mesochannels and high surface area affords a maximum specific capacitance of 300 F g −1 at a 20 mV s −1 scan rate in an aqueous electrolyte solution. A supercapacitor containing the CuO-loaded nanoporous carbon is highly stable and exhibits a long cycle life with 91% specific capacitance retained after 1000 cycles.

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Highly active and selective AlSBA-15 catalysts for the vapor phase tert-butylation of phenol

Cited by 84 publications

References 38 publications

Immobilization of Biomolecules on Mesoporous Structured Materials

Immobilization of Biomolecules on Mesoporous Structured Materials

Alkylation of Phenol with tert-Butanol Catalyzed by Mesoporous Material with Enhanced Acidity Synthesized from Zeolite MCM-22

Fabrication and textural characterization of nanoporous carbon electrodes embedded with CuO nanoparticles for supercapacitors

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