scholarly journals Mesoporous SiO2-Supported Pt Nanoparticles for Catalytic Application

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Yingze Cao ◽  
Wentao Zhai ◽  
Xiang Zhang ◽  
Shuxi Li ◽  
Lin Feng ◽  
...  
Keyword(s):  
Pt Nanoparticles ◽  
Load Ratio ◽  
Catalytic Performance ◽  
One Pot ◽  
Oxide Supports ◽  
Catalytic Application ◽  
Reduce Agent ◽  
One Step ◽  
Mesoporous Sio2

SiO2 nanoparticles have been synthesized by combining Stober’s method and nonsurfactant process. The diameters and pore sizes can be controlled by altering the template and its concentration. Mesoporous SiO2 obtained this way has extremely large surface area compared with most oxide supports, which benefits the catalytic performance. Pt nanoparticles were in situ grown on and in mesoporous SiO2 nanoparticles with low amount of the metal and high load ratio. Furthermore, we firstly developed a novel route, called “one-pot” method, to prepare Pt/SiO2 catalyst where mesoporous silica preparing and Pt loading occurred in one step. This method is more efficient in saving reagent, since it can prevent Pt loss. In the meantime, it enables the template to reduce agent. The catalytic activity of Pt/SiO2 samples was measured by CO oxidation. It is indicated that the supporting silica with mesopores is more active than silica with micropores.

scholarly journals Electron donation of non-oxide supports boosts O2 activation on nano-platinum catalysts

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Tao Gan ◽  
Jingxiu Yang ◽  
David Morris ◽  
Xuefeng Chu ◽  
Peng Zhang ◽  
...  
Keyword(s):  
Catalytic Oxidation ◽  
Pt Nanoparticles ◽  
Catalytic Performance ◽  
Nitrogen Vacancy ◽  
Innovative Strategy ◽  
Oxide Supports ◽  
Heterogeneous Catalytic ◽  
Highly Active ◽  
Electron Sink ◽  
Nitrogen Vacancies

AbstractActivation of O2 is a critical step in heterogeneous catalytic oxidation. Here, the concept of increased electron donors induced by nitrogen vacancy is adopted to propose an efficient strategy to develop highly active and stable catalysts for molecular O2 activation. Carbon nitride with nitrogen vacancies is prepared to serve as a support as well as electron sink to construct a synergistic catalyst with Pt nanoparticles. Extensive characterizations combined with the first-principles calculations reveal that nitrogen vacancies with excess electrons could effectively stabilize metallic Pt nanoparticles by strong p-d coupling. The Pt atoms and the dangling carbon atoms surround the vacancy can synergistically donate electrons to the antibonding orbital of the adsorbed O2. This synergistic catalyst shows great enhancement of catalytic performance and durability in toluene oxidation. The introduction of electron-rich non-oxide substrate is an innovative strategy to develop active Pt-based oxidation catalysts, which could be conceivably extended to a variety of metal-based catalysts for catalytic oxidation.

Preparation of P(St-co-MAA)/CeO2 composite microspheres via surface carboxyl oxidation followed by in situ chemical deposition of CeO2 and their catalytic application on oxidative degradation of methyl orange

RSC Advances ◽  
2014 ◽  
Vol 4 (55) ◽  
pp. 29042-29049 ◽  
Author(s):  
Guanzhi Cheng ◽  
Xinyi Huang ◽  
Hong Zhang ◽  
Yang Hu ◽  
Chengyou Kan
Keyword(s):  
Methyl Orange ◽  
Oxidative Degradation ◽  
Chemical Deposition ◽  
Catalytic Performance ◽  
Composite Microspheres ◽  
Catalytic Application ◽  
Degradation Of Methyl Orange ◽  
Excellent Catalytic Performance

P(St-co-MAA)/CeO2 composites microspheres were fabricated by a novel and facile approach, exhibiting excellent catalytic performance in oxidative degradation.

scholarly journals One-Step Synthesis of Acylboron Compounds via Cu-Catalyzed Carbonylative Borylation of Alkyl Halides

2020 ◽  
Author(s):  
Cheng Li-Jie ◽  
Zhao Siling ◽  
Neal Mankad
Keyword(s):  
Alkyl Halides ◽  
Efficient Synthesis ◽  
Mechanistic Studies ◽  
Acyl Halide ◽  
Reaction Conditions ◽  
One Pot ◽  
One Step ◽  
High Yields ◽  
Tertiary Alkyl

A Cu-catalyzed carbonylative borylation of unactivated alkyl halides has been developed, enabling efficient synthesis of aliphatic potassium acyltrifluoroborates (KATs) in high yields by treating the in-situ formed tetracoordinated acylboron intermediates with aqueous KHF2. A variety of functional groups are tolerated under the mild reaction conditions, and primary, secondary and tertiary alkyl halides are all applicable. In addition, this method also provides facile access to N-methyliminodiacetyl (MIDA) acylboronates as well as α-methylated potassium acyltrifluoroborates in a one-pot manner. Mechanistic studies indicate a radical atom transfer carbonylation (ATC) mechanism to form acyl halide intermediates that are subsequently borylated by (NHC)CuBpin.<br>

scholarly journals 1-(4-Nitrophenyl)-1H-1,2,3-Triazole-4-carbaldehyde: Scalable Synthesis and Its Use in the Preparation of 1-Alkyl-4-Formyl-1,2,3-triazoles

Organics ◽  
2021 ◽  
Vol 2 (4) ◽  
pp. 404-414
Author(s):  
Tomas Opsomer ◽  
Kaat Valkeneers ◽  
Ana Ratković ◽  
Wim Dehaen
Keyword(s):  
One Pot ◽  
Complete Hydrolysis ◽  
One Step ◽  
Synthetic Intermediates ◽  
Cornforth Rearrangement ◽  
Scalable Synthesis ◽  
The One ◽  
Novel Applications ◽  
Hydrolysis Of

1,2,3-Triazole-4-carbaldehydes are useful synthetic intermediates which may play an important role in the discovery of novel applications of the 1,2,3-triazole moiety. In this work, a one-step multigram scale synthesis of 4-formyl-1-(4-nitrophenyl)-1H-1,2,3-triazole (FNPT) as a preferred reagent for the synthesis of 1-alkyl-4-formyltriazoles is described, making use of the commercially available 3-dimethylaminoacrolein and 4-nitrophenyl azide. Next, the earlier reported reaction of FNPT with alkylamines is further explored, and for hexylamine, the one-pot sequential cycloaddition and Cornforth rearrangement is demonstrated. In addition, a useful protocol for the in situ diazotization of 4-nitroaniline is provided. This facilitated the complete hydrolysis of rearranged 4-iminomethyl-1,2,3-triazoles and allowed for the recycling of 4-nitrophenyl azide.

In Situ Investigation of Non-Isothermal Decomposition of Pt Acetylacetonate as One-Step Size-Controlled Synthesis of Pt Nanoparticles

2018 ◽  
Vol 215 (23) ◽  
pp. 1800488
Author(s):  
Anton A. Kulbakov ◽  
Mathieu Allix ◽  
Aydar Rakhmatullin ◽  
Alexey S. Mikheykin ◽  
Yuri V. Popov ◽  
...  
Keyword(s):  
Pt Nanoparticles ◽  
Controlled Synthesis ◽  
Isothermal Decomposition ◽  
Step Size ◽  
In Situ Investigation ◽  
One Step ◽  
Size Controlled

In situ one-step synthesis of metal–organic framework encapsulated naked Pt nanoparticles without additional reductants

2015 ◽  
Vol 3 (15) ◽  
pp. 8028-8033 ◽  
Author(s):  
Hongli Liu ◽  
Lina Chang ◽  
Liyu Chen ◽  
Yingwei Li
Keyword(s):  
Metal Nanoparticles ◽  
Metal Organic Framework ◽  
Pt Nanoparticles ◽  
Reducing Agents ◽  
Metal Organic ◽  
One Step ◽  
Organic Framework

A general and effective one-step strategy is developed to encapsulate tiny metal nanoparticles in various kinds of MOFs without any additional protecting agents and reducing agents.

Efficient one-pot transformation of aminoarenes to haloarenes using halodimethylisulfonium halides generated in situ

2005 ◽  
Vol 83 (3) ◽  
pp. 213-219 ◽  
Author(s):  
Woonphil Baik ◽  
Wanqiang Luan ◽  
Hyun Joo Lee ◽  
Cheol Hun Yoon ◽  
Sangho Koo ◽  
...  
Keyword(s):  
Aromatic Amines ◽  
Environmental Pollutants ◽  
Aryl Halides ◽  
Nitrite Ion ◽  
One Pot ◽  
Aryl Chlorides ◽  
Step Procedure ◽  
One Step ◽  
Copper Halides

Halodimethylsulfonium halide 1, which is readily formed in situ from hydrohaloic acid and DMSO, is a good nucleophilic halide. This activated nucleophilic halide rapidly converts aryldiazonium salt prepared in situ by the same hydrohaloic acid and nitrite ion to aryl chlorides, bromides, or iodides in good yield. The combined action of nitrite ion and hydrohaloic acid in DMSO is required for the direct transformation of aromatic amines, which results in the production of aryl halides within 1 h. Substituted compounds with electron-donating or -withdrawing groups or sterically hindered aromatic amines are also smoothly transformed to the corresponding aromatic halides. The only observed by-product is the deaminated arene (usually <7%). The isolated aryldiazonium salts can also be converted to the corresponding aryl halides using 1. The present method offers a facile, one-step procedure for transforming aminoarenes to haloarenes and lacks the environmental pollutants that usually accompany the Sandmeyer reaction using copper halides. Key words: aminoarenes, haloarenes, halodimethylsulfonium halide, halogenation, amination.

scholarly journals A Novel One-Pot and One-Step Microwave-Assisted Cyclization-Methylation Reaction of Amino Alcohols and Acetylated Derivatives with Dimethyl Carbonate and TBAC

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Adrián Ochoa-Terán ◽  
Leticia Guerrero ◽  
Ignacio A. Rivero
Keyword(s):  
Ionic Liquid ◽  
Dimethyl Carbonate ◽  
Amino Alcohols ◽  
Diethyl Carbonate ◽  
One Pot ◽  
Microwave Assisted ◽  
Methylation Reaction ◽  
One Step ◽  
Better Than

A simple and efficient microwave-assisted methodology for the synthesis of 4-substituted-3-methyl-1,3-oxazolidin-2-ones from amino alcohols catalyzed by a ionic liquid was developed. This novel one-pot and one-step cyclization-methylation reaction represents an easier and faster method than any other reported protocols that can be used to obtain the desired products in good yields and high purity. Applying microwave irradiation at 130°C in the presence of TBAC, dimethyl carbonate acts simultaneously as carbonylating and methylating agent and surprisingly promotes anin situbasic trans esterification when aN-acetylated amino alcohol is used as starting material. Furthermore, dimethyl carbonate worked better than diethyl carbonate in performing this reaction.

One-pot synthesis of aluminum oxyhydroxide matrix-entrapped Pt nanoparticles as an excellent catalyst for the hydrogenation of nitrobenzene

RSC Advances ◽  
2014 ◽  
Vol 4 (21) ◽  
pp. 10997-11002 ◽  
Author(s):  
Guangyin Fan ◽  
Yinhu Wang ◽  
Chenyu Wang
Keyword(s):  
Pt Nanoparticles ◽  
Catalytic Performance ◽  
One Pot ◽  
One Pot Synthesis ◽  
Hydrolysis Of ◽  
Excellent Catalytic Performance ◽  
Aluminum Oxyhydroxide

The Pt/AlO(OH) synthesized by a one-pot procedure from the reduction of Pt4+ and the hydrolysis of Al(O-sec-Bu)3 exhibited an excellent catalytic performance for the hydrogenation of nitroarenes.

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