Partially hydrophobized silica supported Pd catalyst for hydrogenation reactions in aqueous media

Omota, Florin; Dimian, Alexandre C.; Bliek, A.

doi:10.1016/j.apcata.2005.06.032

Cited by 20 publications

(5 citation statements)

References 25 publications

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“…Improving the utilization efficiency of these noble metals and establishing sustainable hydrogenation processes are highly desired for industrial fabrications. [15] These considerations prompted us to choose hydrogenation as a target reaction to check the PEOBS in terms of catalysis efficiency, product isolation efficiency, and catalyst recycling effectiveness.…”

Section: Resultsmentioning

confidence: 99%

Recycling Nanoparticle Catalysts without Separation Based on a Pickering Emulsion/Organic Biphasic System

et al. 2014

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A conceptually novel methodology is explored for in situ recycling of nanoparticle catalysts based on transforming a conventional organic/aqueous biphasic system into a Pickering emulsion/organic biphasic system (PEOBS). The suggested PEOBS exists as two phases, with the nanoparticle catalyst "anchored" in the Pickering emulsion phase, but is "continuous" between the organic phase and the continuous phase of the Pickering emulsion. Aqueous hydrogenations are used to evaluate the reaction performances of PEOBS, and the underlying principles of PEOBS are preliminarily elaborated. The unique properties of PEOBS lead to many intriguing findings, which are unlikely to be achieved in the reported biphasic systems. PEOBS exhibits more than a fourfold enhancement in catalysis efficiency in comparison with a conventional biphasic system. Impressively, PEOBS enables the organic product to be facilely isolated through simple decantation and the nanoparticle catalyst can be recycled in situ without the need for "separation". Its recycling effectiveness is justified by ten reaction cycles without significant catalyst loss. The simple protocol, in conjunction with the stability to simultaneously achieve high catalysis efficiency and excellent catalyst recyclability, makes PEOBS a promising methodology to develop more sustainable nanocatalysis.

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Section: Resultsmentioning

confidence: 99%

Recycling Nanoparticle Catalysts without Separation Based on a Pickering Emulsion/Organic Biphasic System

et al. 2014

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“…The hydrophobic surface modification is another choice when the support material cannot be changed, with the focus on the study of certain catalysts. Omate et al . reported a variable SiO 2 , which was moderated sialylation with dichlorodimethylsilane (DDMS) as the support material with Pd catalysts and showed lower deactivation than Pd/SiO 2 without hydrophobic surface modification.…”

Section: Challenges In the Chc Processmentioning

confidence: 99%

“…The hydrophobic surface modification is another choice when the support material cannot be changed, with the focus on the study of certain catalysts. Omate et al 164 reported a variable SiO 2 , which was moderated sialylation with dichlorodimethylsilane (DDMS) as the support material with Pd catalysts and showed lower deactivation than Pd/SiO 2 without hydrophobic surface modification. Fang et al 165 developed an alumina hollow fiber, which contains hydrophobic properties, and it was fabricated by grafting with fluoroalkylsilane (FAS) to convert it from hydrophilic to hydrophobic.…”

Section: Water Poisoningmentioning

confidence: 99%

Review of Catalysts, Substrates, and Fabrication Methods in Catalytic Hydrogen Combustion with Further Challenges and Applications

Yuan,

Zhao,

Wang

et al. 2024

Energy Fuels

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Hydrogen energy as a clean energy source has been widely studied in recent years. Catalytic hydrogen combustion (CHC) can be used to reduce nitrogen oxide emissions and improve safety by burning hydrogen at a lower temperature. This review analyzes the effect of the hetero/homogeneous reaction mechanism, typical catalyst types (noble metal catalysts, metal oxide catalysts, and perovskite oxides), and support materials (zirconium dioxide, titanium dioxide, anodic aluminum oxide, γ-alumina, and silicon carbide) of CHC. The fabrication methods for CHC catalysts, such as impregnation, chemical vapor deposition, physical vapor deposition, combustion, sol–gel, hydrothermal treatment, and additive manufacturing, are reviewed. A series of challenges in CHC include water poisoning, sulfur poisoning, and durability. Water poisoning was broadly studied, but durability and sulfur poisoning are limitedly explored. The applications of CHC involved power and heat generations. Power generation is depicted as gas turbines and portable power generation, and heat generation is presented as heater and cooking stoves. Moreover, CHC is further applied in safety devices for nuclear power plants and confined spaces. Eventually, research gaps and future direction of the CHC process are concerned and summarized.

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“…In addition to Rh(0) and Ru(0), Pd-nanoparticles were also shown to be active catalyst precursors for heterogeneous hydrogenations in aqueous phase [47][48][49][50][51][52]. For instance, selective hydrogenation of dehydrolinalool (3,7-dimethyloct-6-ene-1-yne-3-ol) to linalool (3,7-dimethyloct-1,6-dene-3-ol) catalyzed by Pd nanoparticles, formed in poly(ethylene oxide)-block-2-vinylpyridine (PEO-b-P2VP) micelles, was studied by varying the ratio of i-PrOH/H 2 O and the pH of the reaction medium [48].…”

Section: (H 2 O)]i 3 and [Rh 4 (Pta-me)mentioning

confidence: 99%

Toward green catalytic synthesis—Transition metal-catalyzed reactions in non-conventional media

Liu

Xiao

2007

Journal of Molecular Catalysis A: Chemical

243

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Partially hydrophobized silica supported Pd catalyst for hydrogenation reactions in aqueous media

Cited by 20 publications

References 25 publications

Recycling Nanoparticle Catalysts without Separation Based on a Pickering Emulsion/Organic Biphasic System

Recycling Nanoparticle Catalysts without Separation Based on a Pickering Emulsion/Organic Biphasic System

Review of Catalysts, Substrates, and Fabrication Methods in Catalytic Hydrogen Combustion with Further Challenges and Applications

Toward green catalytic synthesis—Transition metal-catalyzed reactions in non-conventional media

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