Mesostructured silicas as supports for palladium-catalyzed hydrogenation of phenyl acetylene and 1-phenyl-1-hexyne to alkenes

Marín-Astorga, N.; Pecchi, Gina; Pinnavaia, Thomas J.; Alvez-Manoli, G.; Reyes, Patricio

doi:10.1016/j.molcata.2005.11.031

Cited by 41 publications

(32 citation statements)

References 30 publications

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“…Since the Mobil report an avalanche of research reports followed, focusing on silica because of its industrial relevance and its highly adaptive and malleable polymerization chemistry. An incredible degree of control can be exercised on silica with a variety of pore symmetries, such as wormhole (HMS [4] ), hexagonal (MCM-41, [5] SBA-15 [6] ), cubic (MCM-48 [7] ), and stabilized lamellar. [8] Mesostructured silica materials have been processed into various macroscopic morphologies, such as spheres, [9] helicoids, [10] tops, [11] 1D objects and fibers, [11] and thin films.…”

Section: Holey Semiconductorsmentioning

confidence: 99%

“…Unlike the mesostructured silicas [1,42,43] which derive from the self-polymerization of silicates, chalcogenide frameworks are more easily assembled via coordination reactions between cluster anions and linking metal cations. Some of the bestknown building blocks are the tetrahedral [MQ 4 ], [4,44,45] adamantane [M 4 Q 10 ] (M = Ge, Sn; Q = S, Se, Te), [4,[46][47][48] and the dimeric [Sn 2 Q 6 ] 4-(Q = S, [49] Se [50] ) units. The generic structures of these anions are shown in Scheme 1.…”

Section: Holey Semiconductorsmentioning

confidence: 99%

“…1.8 nm. This material can exchange its surfactant cations with NH 4 + ions without framework shrinkage. A subsequent mild heating step removes most of the ammonium as ammonia to produce a porous material.…”

Section: Semiconductorsmentioning

confidence: 99%

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Beyond Silica: Nonoxidic Mesostructured Materials

2007

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Recent advances in the design and synthesis of mesostructured and mesoporous materials with nonoxide frameworks are reviewed. Chalcogenides comprise the most important class, and all possible pore arrangements known for silica can be achieved in these materials. The special molecular chemistry that leads to organized nonoxidic mesostructures that have a variety of compositions, pore sizes, and semiconductor bandgaps is presented. Also reviewed are recent developments in mesoporous elements, such as metals and germanium. The goal in research on mesoporous semiconductors is to create materials scaffolds with new physical phenomena that derive from the combined characteristics of long‐range porosity and electronic and optical properties.

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Section: Holey Semiconductorsmentioning

confidence: 99%

Section: Holey Semiconductorsmentioning

confidence: 99%

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Beyond Silica: Nonoxidic Mesostructured Materials

2007

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“…For many years, silicates have attracted great attention due to their special physicochemical properties, low cost and abundant supply, and have been widely applied in many fields, such as molecular sieves [16][17][18], catalyst supports [19][20][21][22], gas absorption and separation [23,24], and as raw materials for the glass industry. Examples of 1-D zinc silicates with different morphologies-including needle-like [25], nanowires [26,27], rice-like [28], and nanorod-like [29][30][31][32]-have been synthesized by hydrothermal methods.…”

Section: Introductionmentioning

confidence: 99%

Fine tuning of the dimensionality of zinc silicate nanostructures and their application as highly efficient absorbents for toxic metal ions

Yang

Zhuang

et al. 2010

Nano Res.

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The controllable synthesis of materials with the desired crystal structure and dimensionality is of great significance in material science. In this work we report the successful synthesis of amorphous and crystalline zinc silicates with different dimensionalities and well-defined shapes, including hollow spheres, nanowires and membranes. The structure-related absorption properties have been studied. A detailed study of their ability to remove Pb(Ⅱ), Cd(Ⅱ), Cr(Ⅲ), and Fe(Ⅲ) ions has been performed. The amorphous zero-dimensional (0-D) hollow spheres show the best removal ability for all the metal ions investigated. In particular, their absorption capacity for Pb(Ⅱ) ions is 129 mg/g, which is double the value reported for magnesium silicate hollow spheres. However, the removal abilities of crystalline one-dimensional (1-D) nanowires and two-dimensional (2-D) membranes are found to be dependent on the charge of the target metal ion. In general, nanowires show better removal capacity for trivalent ions, especially Fe(Ⅲ), while 2-D membranes exhibit better removal capacity for divalent ions.

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“…Therefore, development of new catalytic systems with suitable activity and selectivity that are easily separable and recyclable, is the case that draws attention of many researchers [18][19][20][21][22] . These catalytic systems include mesoporous silica supported Pd nanoparticles [23][24][25] . In this work, functionalized SBA-15 metformin palladium composites are used to play three roles, the first is to promote the reacting of the incorporated Pd through the chelating metformin sites, furthermore, the improved dispersion capability of the nanoparticles and last but not least, introducing a separable, recyclable, and reusable catalyst which shows an immobilized catalyst on the surface to facilitate catalyst recovering.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Highly Selective Nano-Structured Functionalized Sba-15 Metformin Palladium Composite Catalyst in Partial Hydrogenation of Alkynes

Kojoori

2016

J. Chil. Chem. Soc.

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In this research, a heterogeneous Nano-Structured functionalized SBA-15 metformin palladium composite catalyst is reported for the selective hydrogenation of alkynes. In the first place, A series of the heterogeneous mesoporous SBA-15 metformin palladium catalyst were prepared and afterwards the condition and the ratio of used materials were optimized to give rise a suitable high performance catalyst. The final nano-structured catalyst was characterized by X-ray powder diffraction, BET surface area, FT-IR spectrophotometer, Scanning electron microscopy (SEM) and Transmission electron microscopy (TEM) and served in partial hydrogenation of different alkynes, with high selectivity and high yield. The liquid phase hydrogenation was conducted under mild condition of room temperature and atmospheric pressure. The reactions were monitored every half an hour by gas chromatography and all of them were completed during 4-6 hours. The products were characterized by 1 H-NMR, 13 C-NMR, FT-IR, and Mass Spectrometry (MS) that strongly confirmed the (Z)-double bond configuration of produced alkenes. This prepared catalyst is competitive with the best palladium catalysts known for the selective liquid phase hydrogenation of alkynes and can be easily recovered and regenerated with keeping high activity and selectivity over multiple cycles with a simple regeneration procedure.

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Mesostructured silicas as supports for palladium-catalyzed hydrogenation of phenyl acetylene and 1-phenyl-1-hexyne to alkenes

Cited by 41 publications

References 30 publications

Beyond Silica: Nonoxidic Mesostructured Materials

Beyond Silica: Nonoxidic Mesostructured Materials

Fine tuning of the dimensionality of zinc silicate nanostructures and their application as highly efficient absorbents for toxic metal ions

Synthesis of Highly Selective Nano-Structured Functionalized Sba-15 Metformin Palladium Composite Catalyst in Partial Hydrogenation of Alkynes

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