Solvent-free aerobic oxidation of alcohols over palladium supported on MCM-41

Qi, Ben; Wang, Yanbing; Lou, Lan‐Lan; Huang, Linyue; Yang, Ying; Liu, Shuangxi

doi:10.1016/j.molcata.2013.01.007

Cited by 28 publications

(11 citation statements)

References 54 publications

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“…The real contribution of the support is still under debate and much effort should be paid to understand its effect. Metal oxides such as SBA-15 [59], MCM-41 [60], alumina [61] and carbonaceous materials [58] with different morphology and functionalization have been used as support. In this section, we will be report selected examples of attempts to elucidate the effects of supports on activity, selectivity and durability.…”

Section: Support Effectmentioning

confidence: 99%

“…Ordered mesoporous structures, namely SBA-15 and MCM-41, were prepared by Karimi et al in refs [59] and [60] respectively. SBA-15 has a regular channel structure and SBA-15 with pore diameter of 7.6 nm were used to study the aerobic oxidation of BA in toluene at 80 • C. Pd/SBA-15 (0.4 mol%) which was functionalized with a bipyridylamide ligand was highly active and selective (over 99% yield of benzaldehyde) after five hours.…”

Section: Oxidesmentioning

confidence: 99%

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Selective Benzyl Alcohol Oxidation over Pd Catalysts

2018

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In the last decades, the selective liquid phase oxidation of alcohols to the corresponding carbonyl compounds has been a subject of growing interest. Research has focused on green methods that use “clean” oxidants such as O2 in combination with supported metal nanoparticles as the catalyst. Among the alcohols, benzyl alcohol is one of the most studied substrates. Indeed, benzyl alcohol can be converted to benzaldehyde, largely for use in the pharmaceutical and agricultural industries. This conversion serves as model reaction in testing new potential catalysts, that can then be applied to other systems. Pd based catalysts have been extensively studied as active catalytic metals for alcohol oxidation for their high activity and selectivity to the corresponding aldehyde. Several catalytic materials obtained by careful control of the morphology of Pd nanoparticles, (including bimetallic systems) and by tuning the support properties have been developed. Moreover, reaction conditions, including solvent, temperature, pressure and alcohol concentration have been investigated to tune the selectivity to the desired products. Different reaction mechanisms and microkinetic models have been proposed. The aim of this review is to provide a critical description of the recent advances on Pd catalyzed benzyl alcohol oxidation.

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Section: Support Effectmentioning

confidence: 99%

Section: Oxidesmentioning

confidence: 99%

Selective Benzyl Alcohol Oxidation over Pd Catalysts

2018

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“…3A , all the adsorption isotherms for the supports belonged to the type IV hysteresis loops, indicating the presence of mesoporous pores. 43 The pore diameter distributions of the supports ( Fig. 3B ) suggested that the supports mainly consisted of the micropores.…”

Section: Resultsmentioning

confidence: 93%

Dehydrogenation of methylcyclohexane over Pt-based catalysts supported on functional granular activated carbon

Liu

Zhang

et al. 2021

RSC Adv.

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“…Under the same reaction condition, our catalyst showed a conversion of 60.3% and a selectivity of 99.2%, much higher than the conversion of 28.4% and the selectivity of 94.4% given by Pd–MCM-41. 35 Moreover, the TOF (4807 h –1 ) is also obviously higher than that of Pd–MCM-41 (2434 h –1 ). 35 The excellent catalytic performance would be ascribed to the much smaller mean particle size of Pd nanoparticles (1.1 nm) compared with that of Pd–MCM-41 (7.4 nm).…”

Section: Resultsmentioning

confidence: 94%

“…35 Moreover, the TOF (4807 h –1 ) is also obviously higher than that of Pd–MCM-41 (2434 h –1 ). 35 The excellent catalytic performance would be ascribed to the much smaller mean particle size of Pd nanoparticles (1.1 nm) compared with that of Pd–MCM-41 (7.4 nm). The 1H NMR spectra of the oxidized product are shown in Figure S9.…”

Section: Resultsmentioning

confidence: 94%

Monodispersed Pd Nanoparticles Supported on Mg–Al Mixed Metal Oxides: A Green and Controllable Synthesis

Zhu

Shen

et al. 2016

ACS Omega

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Aimed at the green synthesis of supported noble metal nanoparticles without any additional reducing agents or stabilizers at room temperature, a new strategy in which monodispersed Pd nanoparticles were successfully immobilized on Mg–Al mixed metal oxides derived from layered double hydroxides was developed, and the reduction mechanism was also proposed. It allowed the in situ immobilization of monodispersed Pd nanoparticles with a face-centered cubic structure, using only alcohols with α-hydrogen atom as the solvent and reducing agent. Control over the mean particle size and content of Pd nanoparticles was realized by adjusting the temperature, initial concentration, and type of alcohol. With the content of Pd varied from 6.4 to 42.3 mg/g, the mean particle size of Pd increased from 1.1 to 4.9 nm. The as-prepared catalyst showed high catalytic activity for oxidation of benzyl alcohol: when the Pd content was 6.4 mg/g, conversion of 60.3% and selectivity of 99.2% were obtained with a turnover frequency of 4807 h –1 . Similarly, on the basis of the high stand electrode potentials, immobilized Ag (5.6 nm) and Au (4.7 nm) nanoparticles were also prepared through this methodology. Moreover, the choice of supports was extended to other powder supports that would react with the byproduced acid. Overall, this facile method opens up new opportunities for controllable synthesis of supported nanoparticle catalysts in a green way.

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Solvent-free aerobic oxidation of alcohols over palladium supported on MCM-41

Cited by 28 publications

References 54 publications

Selective Benzyl Alcohol Oxidation over Pd Catalysts

Selective Benzyl Alcohol Oxidation over Pd Catalysts

Dehydrogenation of methylcyclohexane over Pt-based catalysts supported on functional granular activated carbon

Monodispersed Pd Nanoparticles Supported on Mg–Al Mixed Metal Oxides: A Green and Controllable Synthesis

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