Synthesis, characterization, and catalytic activity of sulfonic acid-functionalized periodic mesoporous organosilicas

Yang, Qihua; Liu, Jian; Yang, Jie; Kapoor, Mahendra P.; Inagaki, Shinji; Li, Can

doi:10.1016/j.jcat.2004.09.007

Cited by 228 publications

(167 citation statements)

References 22 publications

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“…The difference of the cage size calculated from the BJH and estimated from the TEM is mainly due to the fact that the BJH model is not very suitable for determining the pore size with cage structure. [18][19][20] Compared with the ethylene group, the phenylene is more reactive toward chemical reactions, such as sulfonation, alkylation, nitration, etc. [21][22][23] However, the structure and morphology control of the organosilicas with bridging phenylene group is not fully investigated.…”

Section: Synthesis Of Silica Particlesmentioning

confidence: 99%

Tunable Assembly of Organosilica Hollow Nanospheres

et al. 2009

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Hollow nanospheres with a particle size of less than 25 nm have been successfully fabricated using an ethylene-, phenylene-, and 1,4-diethylphenylene-bridging silane precursor with F127 as a soft template under an acidic medium. As the size and flexibility of the bridging organic group increases, it is more and more difficult for the formation of hollow nanospheres. The organic additive, 1,3,5-trimethylbenzene, could finely tune the particle size of the nanosphere from 12 to 25 nm. It was found that silane precursors with hydrophobicity and slow hydrolysis rate favor the formation of hollow nanospheres and hydrophilic silane precursors such as tetramethoxysilane induce the formation of mesostructured bulk materials. Under the current synthesis conditions, carefully tuning the interaction between templates and silica species, organosilica hollow nanospheres with controlled composition can be successfully obtained.

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Section: Synthesis Of Silica Particlesmentioning

confidence: 99%

Tunable Assembly of Organosilica Hollow Nanospheres

et al. 2009

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“…[6][7][8] With the above-mentioned advantages, PMOs are potential candidates in the fields of adsorption and catalysis. [8][9][10][11][12][13] Another important aspect in the progress of PMOs is to control their textural and structural properties for applications in selective adsorption, separation and nanocasting, where tuned adsorption and diffusion of guest molecules and hostguest interactions are desired. The great progress in the structural control of OMMs provides diverse pathways to synthesize PMOs with different mesophases.…”

Section: Introductionmentioning

confidence: 99%

Highly ordered periodic mesoporous ethanesilica synthesized under neutral conditions

et al. 2005

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Highly ordered mesoporous ethanesilica (MES) with 2D hexagonal structure was synthesized from 1,2-bis(trimethoxysilyl)ethane under neutral conditions for the first time. Divalent salts, such as NiCl 2 , MgCl 2 , ZnCl 2 , ZnSO 4 and Zn(NO 3 ) 2 , were used to help the formation of the ordered mesostructure. The MES samples were characterized by powder X-ray diffraction, nitrogen sorption, transmission electron microscopy, FT-IR, 13 C and 29 Si solid-state NMR and thermal gravimetric analysis. A phase transition from a disordered wormhole-like structure to an ordered P6mm structure was observed upon the addition of inorganic salts. The pore size of the MES decreases from 4.7 to 3.9 nm with increasing content of the inorganic salts. Fluoride was also found to be important for the formation of ordered MES under neutral conditions.

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“…Surface modification via the incorporation of organic functionality into polar oxide surfaces, or dehydroxylation, can lower their polarity and thereby increase initial rates of acid catalysed transformations of liquid phase organic molecules [94]. Surface polarity can also be tuned by incorporating alkyl/aromatic groups directly into the silica framework, for example polysilsesquioxanes can be prepared via the co-condensation of 1,4-bis(triethoxysilyl)benzene (BTEB), or 1,2-bis(trimethoxysilyl)-ethane (BTME), with TEOS and MPTS in the sol-gel process [95,96] which enhances small molecule esterification [97] and etherification [98]. The incorporation of organic spectator [100] sulphonic acid silicas is achievable via co-grafting or simple addition of the respective alkyl or aryltrimethoxysilane during cocondensation protocols.…”

Section: Heterogeneously Catalysed Routes To Biodieselmentioning

confidence: 99%

Catalysing Sustainable Fuel and Chemical Synthesis

Lee¹

2015

Advanced Biofuels

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Concerns over the economics of proven fossil fuel reserves, in concert with government and public acceptance of the anthropogenic origin of rising CO 2 emissions and associated climate change from such combustible carbon, are driving academic and commercial research into new sustainable routes to fuel and chemicals. The quest for such sustainable resources to meet the demands of a rapidly rising global population represents one of this century's grand challenges. Here, we discuss catalytic solutions to the clean synthesis of biodiesel, the most readily implemented and low cost, alternative source of transportation fuels, and oxygenated organic molecules for the manufacture of fine and speciality chemicals to meet future societal demands.

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Synthesis, characterization, and catalytic activity of sulfonic acid-functionalized periodic mesoporous organosilicas

Cited by 228 publications

References 22 publications

Tunable Assembly of Organosilica Hollow Nanospheres

Tunable Assembly of Organosilica Hollow Nanospheres

Highly ordered periodic mesoporous ethanesilica synthesized under neutral conditions

Catalysing Sustainable Fuel and Chemical Synthesis

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