From supported homogeneous catalysts to heterogeneous molecular catalysts

Choplin, A.; Quignard, Françoise

doi:10.1016/s0010-8545(98)00062-9

Cited by 154 publications

(97 citation statements)

References 128 publications

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“…Many homo-and heterogeneous catalysts have been prepared by using the clusters as catalyst precursors [3,4]. Among them, the heterogeneous catalysts prepared by metallic carbonyl cluster precursors loaded on solid supports exhibited distinct characteristics and activities in heterogeneous catalyst system [5,6]. The published studies indicated that the carbonyl precursors, such as Co 2 (CO) 8 , Co 4 (CO) 12 and Os 3 (CO) 12 [7][8][9], are excellent precursors due to their small metallic particles, which possibly emerge from the bonds between metal atoms in their zero oxidation state in these complexes.…”

Section: Introductionmentioning

confidence: 99%

RETRACTED: Effect of pretreatment temperature on catalytic performance of the catalysts derived from cobalt carbonyl cluster in Fischer-Tropsch Synthesis

2017

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Abstract:The monometallic cobalt-based catalysts were prepared by pretreating the catalysts derived from carbonyl cluster precursor (CO) 6 Co 2 CC(COOH) 2 supported on γ-Al 2 O 3 with hydrogen at 180, 220, and 260°C respectively. The temperature effect of the pretreatments on the structure evolution of cluster precursors and the catalytic performance of the Fischer-Tropsch (F-T) synthesis was investigated. The pretreated catalyst at 220°C with unique phase structure exhibited best catalytic activity and selectivity among three pretreated catalysts. Moreover, the catalysts exhibited high dispersion due to the formation of hydrogen bonds between the cluster precursor and γ-Al 2 O 3 support.

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Section: Introductionmentioning

confidence: 99%

RETRACTED: Effect of pretreatment temperature on catalytic performance of the catalysts derived from cobalt carbonyl cluster in Fischer-Tropsch Synthesis

2017

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“…and activity are better in the case of homogeneous catalysts [4] whereas product separation, catalyst recovery [5,6], and resistance to drastic operational conditions [7,8] are advantageous features of heterogeneous catalysts. Combination of these features would be desirable to arrive at an ideal catalyst system.…”

Section: E-mail Address: Gvankoten@chemuunl (G Van Koten)mentioning

confidence: 99%

“…A transition metal is either complexed to ligands already chemically bonded (immobilized) to a sup-port, or a metal complex containing an appropriate coupling agent is tethered to a support [6]. In the first approach, the coordination sphere around the metal center changes during immobilization via various ligand exchange processes and the average structural properties of this immobilized complex could be quite different from those of the homogeneous complex.…”

Section: E-mail Address: Gvankoten@chemuunl (G Van Koten)mentioning

confidence: 99%

Novel silica immobilized NCN-pincer palladium(II) and platinum(II) complexes: Application as Lewis acid catalysts

Mehendale

Bezemer²,

Walree³

et al. 2006

Journal of Molecular Catalysis A: Chemical

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Abstract2,6-Bis[(dimethylamino)methyl]phenyl (NCN-pincer) palladium(II) and platinum(II) complexes tethered to a trialkoxysilane coupling agent through a carbamate linkage were immobilized on various types of silica using a grafting or a sol-gel process. The resulting hybrid materials were characterized by IR spectroscopy (DRIFT) and solid state CP/MAS NMR ( 13 C and 29 Si). Based on these analyses, H-bond interactions between the carbamate carbonyl group of the complex and the free silanol groups on silica surface were established. The palladium-based materials were tested for their activity as Lewis acid catalysts in the aldol reaction between methyl isocyanoacetate and benzaldehyde. It was found that these materials can indeed be applied as catalysts in this reaction. Their repetitive reuse showed an inferior catalytic efficacy, which presumably was caused by a reconstitution of the silica support. These studies also revealed that simple silver-based salts are active catalysts in this aldol reaction.

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“…These drawbacks can be solved by heterogenization of the homogeneous catalyst to produce a heterogeneous catalyst which has high activity and selectivity. This process can be done by immobilization of the homogeneous catalyst on the heterogeneous catalyst surface through impregnation or encapsulation [7]. AlCl 3 catalyst has been previously impregnated on the MCM-41.…”

Section: Introductionmentioning

confidence: 99%

Condensation of Indole with Isatin over AlCl<sub>3</sub>/Mesoporous Aluminosilicate

Purbaningtias¹,

Prasetyoko²,

Bahruji³

et al. 2015

Indones. J. Chem.

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From supported homogeneous catalysts to heterogeneous molecular catalysts

Cited by 154 publications

References 128 publications

RETRACTED: Effect of pretreatment temperature on catalytic performance of the catalysts derived from cobalt carbonyl cluster in Fischer-Tropsch Synthesis

RETRACTED: Effect of pretreatment temperature on catalytic performance of the catalysts derived from cobalt carbonyl cluster in Fischer-Tropsch Synthesis

Novel silica immobilized NCN-pincer palladium(II) and platinum(II) complexes: Application as Lewis acid catalysts

Condensation of Indole with Isatin over AlCl<sub>3</sub>/Mesoporous Aluminosilicate

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