A New Family of Copolymers:  Multifunctional Periodic Mesoporous Organosilicas

Burleigh, Mark C.; Jayasundera, Shalini; Spector, Mark S.; Thomas, Chris W.; Markowitz, Michael A.; Gaber, Bruce P.

doi:10.1021/cm034862l

Cited by 68 publications

(54 citation statements)

References 11 publications

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“…81,[165][166][167][168][169][170][171][172][173][174] This method is particularly viable for the incorporation of organic moieties into the pore walls as shown in the case of bifunctional periodic mesoporous organosilicas. [175][176][177][178][179] The advantages of this method are (a) it is applicable to a wide variety of organoalkoxysilanes; (b) it is suitable for a wide range of reaction conditions; (c) the coverage of functional groups is homogeneous; and (d) the loading amount of functional groups is high, and there is no dramatic effect on the structural ordering of the pores. Phase separation of the precursors and the cleavage of Si-C bonds during the sol-gel reaction and during surfactant removal have to be avoided in the cocondensation reactions.…”

Section: Surface Functionalizationmentioning

confidence: 99%

Silica-Based Mesoporous Nanospheres

Bhattacharyya

Ducheyne

2011

Comprehensive Biomaterials

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Section: Surface Functionalizationmentioning

confidence: 99%

Silica-Based Mesoporous Nanospheres

Bhattacharyya

Ducheyne

2011

Comprehensive Biomaterials

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“…Surfactant templated mesoporous organic-inorganic organosilicates were synthesized according to the methods of Burleigh et al (2004). The organosilicate precursors were:…”

Section: Synthesis Of the Catalysts/sorbentsmentioning

confidence: 99%

“…Surfactant-templated mesoporous organic-inorganic silicates were synthesized according to the methods of Burleigh et al (2004). The introduction of organic functionalities to form the proposed metal-containing nanoporous materials was accomplished by directly co-condensing the organoalkoxysilane precursors with the siloxane silica source.…”

Section: Toward the Development Of Combined Catalysts And Sorbents Fomentioning

confidence: 99%

Oxidation of Mercury in Products of Coal Combustion

Walsh¹,

Tong²,

Bhopatkar³

et al. 2009

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________________________________________________________________________Laboratory measurements of mercury oxidation during selective catalytic reduction (SCR) of nitric oxide, simulation of pilot-scale measurements of mercury oxidation and adsorption by unburned carbon and fly ash, and synthesis of new materials for simultaneous oxidation and adsorption of mercury, were performed in support of the development of technology for control of mercury emissions from coal-fired boilers and furnaces.Conversion of gas-phase mercury from the elemental state to water-soluble oxidized form (HgCl 2 ) enables removal of mercury during wet flue gas desulfurization. The increase in mercury oxidation in a monolithic V 2 O 5 -WO 3 /TiO 2 SCR catalyst with increasing HCl at low levels of HCl (< 10 ppmv) and decrease in mercury oxidation with increasing NH 3 /NO ratio during SCR were consistent with results of previous work by others. The most significant finding of the present work was the inhibition of mercury oxidation in the presence of CO during SCR of NO at low levels of HCl. In the presence of 2 ppmv HCl, expected in combustion products from some Powder River Basin coals, an increase in CO from 0 to 50 ppmv reduced the extent of mercury oxidation from 24 ± 3 to 1 ± 4%. Further increase in CO to 100 ppmv completely suppressed mercury oxidation. In the presence of 11-12 ppmv HCl, increasing CO from 0 to ~120 ppmv reduced mercury oxidation from ~70% to 50%. Conversion of SO 2 to sulfate also decreased with increasing NH 3 /NO ratio, but the effects of HCl and CO in flue gas on SO 2 oxidation were unclear.Oxidation and adsorption of mercury by unburned carbon and fly ash enables mercury removal in a particulate control device. A chemical kinetic mechanism consisting of nine homogeneous and heterogeneous reactions for mercury oxidation and removal was developed to interpret pilot-scale measurements of mercury oxidation and adsorption by unburned carbon and fly ash in experiments at pilot scale, burning bituminous coals (Gale, 2006) and blends of bituminous coals with Powder River Basin coal (Gale, 2005). The removal of mercury by fly ash and unburned carbon in the flue gas from combustion of the bituminous coals and blends was reproduced with satisfactory accuracy by the model. The enhancement of mercury capture in the presence of calcium (Gale, 2005) explained a synergistic effect of blending on mercury removal across the baghouse. The extent of mercury oxidation, on the other hand, was not so well described by the simulation, because of oversensitivity of the oxidation process in the model to the concentration of unburned carbon.Combined catalysts and sorbents for oxidation and removal of mercury from flue gas at low temperature were based on surfactant-templated silicas containing a transition metal and an organic functional group. The presence of both metal ions and organic groups within the pore structure of the materials is expected to impart to them the ability to simultaneously oxidize elemental mercury and adso...

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“…By using this approach, Burleigh et al 51 succeeded in synthesizing a new family of bifunctional PMOs that contain ethane and benzene bridges by co-condensation of the corresponding bridged organosilanes under acid conditions in the presence of nonionic oligomer surfactant C 18 H 37 EO 10 (Brij 76). All of the as-synthesized PMO products exhibited a highly ordered mesostructure with 2-D hexagonal (p6mm) pore symmetry regardless of the…”

Section: Pmos From Mixtures Of Bis- Tris- and Multisilylated Precurmentioning

confidence: 99%

Periodic Mesoporous Organosilicas

Yao

Zhao

2005

Encyclopedia of Inorganic Chemistry

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Periodic mesoporous organosilicas (PMOs) represent a promising new class of organic–inorganic nanocomposite materials in which the organic and inorganic moieties are covalently linked and homogeneously distributed at molecular level. This review retrospected the discovery and development of PMOs in terms of rational synthesis based on the concept of supramolecular self‐assembly. The main focus is on precursors and crystal‐like PMOs. We also highlight the recent achievements regarding compositions and mesostructures, morphologies, and applications in the field. Furthermore, we present an outlook about the promising future perspectives of PMOs that result from the latest developments.

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A New Family of Copolymers: Multifunctional Periodic Mesoporous Organosilicas

Cited by 68 publications

References 11 publications

Silica-Based Mesoporous Nanospheres

Silica-Based Mesoporous Nanospheres

Oxidation of Mercury in Products of Coal Combustion

Periodic Mesoporous Organosilicas

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