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Keyword:'silica catalyst'
Showing 1-30 of 245 results for "silica catalyst" within Papers
Nuria Sánchez-Bastardo et al.
Bioresource technology, 238, 379-388 (2017-04-30)
The hydrolysis process of a real fraction of arabinoxylans derived from wheat bran was studied. The influence of catalyst type and loading, reaction time and different metal cations were discussed in terms of the hydrolysis yield of arabinose and xylose
Shiwani Shukla et al.
Archiv der Pharmazie, 347(7), 486-495 (2014-05-02)
A series of 4,6-diaryl/heteroarylpyrimidones was synthesized employing silica-supported fluoroboric acid under solvent-free conditions in a microwave reactor. The catalytic influence of HBF4-SiO2 was investigated in detail to optimize the reaction conditions. The synthesized compounds were evaluated for in vitro xanthine
Arne T Dickschat et al.
Chemical communications (Cambridge, England), 49(22), 2195-2197 (2013-02-09)
Bifunctional mesoporous silica nanoparticles (MSNs) bearing Pd-complexes and additional basic sites were prepared and tested as cooperative active catalysts in the Tsuji-Trost allylation of ethyl acetoacetate. Functionalization of the MSNs was realized by postmodification using click-chemistry. The selectivity of mono
T Fey et al.
The Journal of organic chemistry, 66(24), 8154-8159 (2001-11-28)
The application of silica-supported TEMPO as a recyclable catalyst in the Anelli oxidation of alcohols is reported. The catalyst is easily obtained in a one-step reductive amination procedure starting from a commercially available aminopropyl-functionalized silica. Details of the synthesis of
Kathryn M Chepiga et al.
Organic letters, 15(24), 6136-6139 (2013-11-21)
A silica-supported dirhodium(II) tetraprolinate catalyst was synthesized in four steps from l-proline and used in a range of enantioselective transformations of donor/acceptor carbenoids. These include cyclopropenation, cyclopropanation, tandem ylide formation/[2,3] sigmatropic rearrangement, and a variety of combined C-H functionalization/Cope rearrangement
Kelly E Aldrich et al.
Dalton transactions (Cambridge, England : 2003), 48(30), 11352-11360 (2019-07-10)
Highly dehydrated silica gel, SiO2700, gave a material with a total surface hydroxyl density of 0.31 ± 0.05 mmol g-1, 0.9 ± 0.1 Si-OH sites per nm2. Treatment of this material with Ti(NMe2)4 gave Ti(NMe2)3/SiO2700, which is 1.50% ± 0.07
Jörg P Thielemann et al.
Chemphyschem : a European journal of chemical physics and physical chemistry, 14(2), 441-447 (2013-01-03)
The structure of silica SBA-15-supported molybdenum oxide catalysts is investigated during selective oxidation of propylene at 500 °C using operando Raman spectroscopy. The active catalysts contain mixtures of dispersed molybdenum oxide species exhibiting monooxo and dioxo structure. An increase in
Preparation, characterization, and activity of silica supported metallocene catalysts
L Britcher, et al.
Chemistry of Materials, 16, 5713-5720 (2004)
Esterification via saccharine mediated silica solid catalyst.
Adam F, et al.
Applied Catalysis A: General, 365(2), 165-172 (2009)
Branched functionalised polysiloxane-silica hybrids for immobilisation of catalysts.
Rozga-Wijas, K, et al.
Journal of Materials Chemistry, 13(9), 2301-2310 (2003)
Thomas Fenton et al.
Dalton transactions (Cambridge, England : 2003), 46(32), 10721-10726 (2017-06-09)
Coupling with robust surfaces is a promising approach to improve the stability and recyclability of highly active molecular catalysts. This study builds on our prior success to deposit a Co(iii) cyclam complex, where cyclam is 1,4,8,11-tetraazacyclotetradecane, on mesoporous silica via
Khodabakhsh Niknam et al.
Molecules (Basel, Switzerland), 14(5), 1915-1926 (2009-05-28)
The reaction of 3-mercaptopropylsilica (MPS) and chlorosulfonic acid in chloroform afforded silica bonded S-sulfonic acid (SBSSA), which was used as a catalyst for the room temperature synthesis of quinoxaline derivatives from 1,2-diamino compounds and 1,2-dicarbonyl compounds. The catalyst could be
Mesoporous silica-aluminas as catalysts for the alkylation of aromatic hydrocarbons with olefins.
Perego C, et al.
Microporous and Mesoporous Materials : The Official Journal of the International Zeolite Association, 27(2-3), 345-354 (1999)
Mesoporous silica-aluminas as catalysts for the alkylation of aromatic hydrocarbons with olefins.
Perego C, et al.
Microporous and Mesoporous Materials : The Official Journal of the International Zeolite Association, 27(2), 345-354 (1999)
Amine-modified titania-silica hybrid gels as epoxidation catalysts.
Muller, CA, et al.
Applied Catalysis A: General, 201(2), 253-261 (2000)
Silica-supported rhodium-cobalt catalysts for Fischer-Tropsch synthesis
Yan Z, et al.
Catalysis Today, 160(1), 39-43 (2011)
The dimerization of propylene over a nickel oxide-silica-alumina catalyst.
Imai H, et al.
Bulletin of the Chemical Society of Japan, 41(1), 45-48 (1968)
Amine-modified titania?silica hybrid gels as epoxidation catalysts
Muller CA, et al.
Applied Catalysis A: General, 201(2), 253-261 (2012)
T Djekić et al.
Journal of chromatography. A, 1142(1), 32-38 (2006-10-20)
The goal of this paper is the evaluation of functionalized silica's for the recovery of homogeneous catalysts by adsorption via its metal centre. As model catalysts, we selected bis(triphenylphosphine)cobalt(II)dichloride (CoCl(2)(PPh(3))(2)), bis(triphenylphosphine)palladium(II)dichloride (PdCl(2)(PPh(3))(2)) and tris(triphenylphosphine)rhodium(I)dichloride (RhCl(PPh(3))(3)). Twelve functionalized groups selected from
Silica-alumina catalyst support, an efficient catalyst for synthesis of halogen substituted 2, 6-bis (imino) pyridines
Qian Changtao, et al.
Synlett, 2003, 1419-1422 (2003)
Mesoporous silica nanosphere supported ruthenium catalysts for asymmetric hydrogenation.
David J Mihalcik et al.
Angewandte Chemie (International ed. in English), 47(33), 6229-6232 (2008-07-10)
E R Leite et al.
Journal of nanoscience and nanotechnology, 2(1), 89-94 (2003-08-12)
Here we describe a new route for the synthesis of nanometric Ni particles embedded in a mesoporous silica material with excellent potential for catalytic applications. Mesoporous silica with a surface area in the range of 202-280 m2/g, with narrow pore
Edward A Karakanov et al.
ChemistryOpen, 8(3), 358-381 (2019-04-13)
Heterogeneous Pd-containing nanocatalysts, based on poly (propylene imine) dendrimers immobilized in silica pores and networks, obtained by co-hydrolysis in situ, have been synthesized and examined in the hydrogenation of various unsaturated compounds. The catalyst activity and selectivity were found to strongly
Filip de Clippel et al.
Journal of the American Chemical Society, 134(24), 10089-10101 (2012-05-04)
A novel catalyst design for the conversion of mono- and disaccharides to lactic acid and its alkyl esters was developed. The design uses a mesoporous silica, here represented by MCM-41, which is filled with a polyaromatic to graphite-like carbon network.
Mikhail N Khrizanforov et al.
Dalton transactions (Cambridge, England : 2003), 45(30), 11976-11982 (2016-07-08)
We have developed Ni(III)-doped silica nanoparticles ([(bpy)xNi(III)]@SiO2) as a recyclable, low-leaching, and efficient oxidative functionalization nanocatalyst for aromatic C-H bonds. The catalyst is obtained by doping the complex [(bpy)3Ni(II)] on silica nanoparticles along with its subsequent electrooxidation to [(bpy)xNi(III)] without
Synthesis of Gold Catalysts Supported on Mesoporous Silica Materials: Recent Developments.
Gutierrez LF, et al.
Catalysts, 1, 97-154 (2011)
Aimee K Clarke et al.
Angewandte Chemie (International ed. in English), 55(44), 13798-13802 (2016-10-22)
Silica-supported AgNO3 (AgNO3 -SiO2 ) catalyzes the dearomatizing spirocyclization of alkyne-tethered aromatics far more effectively than the analogous unsupported reagent; in many cases, reactions which fail using unsupported AgNO3 proceed effectively with AgNO3 -SiO2 . Mechanistic studies indicate that this
Synthesis of Gold Catalysts Supported on Mesoporous Silica Materials: Recent Developments.
Gutierrez LF, et al.
Catalysts, 1(1), 97-154 (2011)
Synthesis of Gold Catalysts Supported on Mesoporous Silica Materials: Recent Developments.
Gutierrez LF, et al.
Catalysts, 1(1), 97-154 (2011)
Rongji Cui et al.
Waste management (New York, N.Y.), 109, 65-74 (2020-05-11)
Considering that the utilization of fly ash in the removal of flue gas pollutants not only provide a way of high value-added utilization of fly ash, but also greatly reduce the cost of removing flue gas pollutant, the synthesis of
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