In situ synthesis of ultra-small platinum nanoparticles using a water soluble polyphenolic polymer with high catalytic activity

RSC Advances ◽  
2014 ◽  
Vol 4 (93) ◽  
pp. 51745-51753 ◽  
Author(s):  
Tanmoy Maji ◽  
Sanjib Banerjee ◽  
Mrinmoy Biswas ◽  
Tarun K. Mandal
Keyword(s):  
Catalytic Activity ◽  
Organic Solvent ◽  
Platinum Nanoparticles ◽  
In Situ Synthesis ◽  
Reduction Technique ◽  
Water Soluble ◽  
High Catalytic Activity

Ultra-small platinum nanoparticles are generated by in situ polymer reduction technique which shows high catalytic activity in water and in organic solvent.

In situ synthesis and catalytic activity in CO oxidation of metal nanoparticles supported on porous nanocrystalline silicon

2010 ◽  
Vol 36 (22) ◽  
pp. 63-70
Author(s):  
Sergej Polisski ◽  
Bernhard Goller ◽  
Karen Wilson ◽  
Dmitry Kovalev ◽  
Vladimir Zaikowskii ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Co Oxidation ◽  
Metal Nanoparticles ◽  
Nanocrystalline Silicon ◽  
In Situ Synthesis

scholarly journals Catalytic Degradation of Chitosan by Supported Heteropoly Acids in Heterogeneous Systems

Catalysts ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1078
Author(s):  
Hang Zhang ◽  
Zhipeng Ma ◽  
Yunpeng Min ◽  
Huiru Wang ◽  
Ru Zhang ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Molecular Weight ◽  
Catalytic Activity ◽  
Activated Carbon ◽  
Reaction Time ◽  
High Molecular Weight ◽  
Reaction Temperature ◽  
Water Soluble ◽  
High Catalytic Activity ◽  
High Molecular Weight Chitosan

Several kinds of composite materials with phosphotungstic acid (PTA) as the catalyst were prepared with activated carbon as support, and their structures were characterized. According to the Box–Behnken central combination principle, the mathematical model of the heterogeneous system is established. Based on the single-factor experiments, the reaction temperature, the reaction time, the amount of hydrogen peroxide and the loading capacity of PTA were selected as the influencing factors to study the catalyzed oxidation of hydrogen peroxide and degradation of high molecular weight chitosan. The results of IR showed that the catalyst had a Keggin structure. The results of the mercury intrusion test showed that the pore structure of the supported PTA catalyst did not change significantly, and with the increase of PTA loading, the porosity and pore volume decreased regularly, which indicated that PTA molecules had been absorbed and filled into the pore of activated carbon. The results of Response Surface Design (RSD) showed that the optimum reaction conditions of supported PTA catalysts for oxidative degradation of high molecular weight chitosan by hydrogen peroxide were as follows: reaction temperature was 70 ℃, reaction time was 3.0 h, the ratio of hydrogen peroxide to chitosan was 2.4 and the catalyst loading was 30%. Under these conditions, the yield and molecular weight of water-soluble chitosan were 62.8% and 1290 Da, respectively. The supported PTA catalyst maintained high catalytic activity after three reuses, which indicated that the supported PTA catalyst had excellent catalytic activity and stable performance compared with the PTA catalyst.

Gamma radiation-assisted in situ synthesis of palladium nanoparticles supported on ethylenediamine-functionalized polypropylene fabric as an efficient catalyst for reduction of 4-nitrophenol

2020 ◽  
Vol 44 (44) ◽  
pp. 19337-19350
Author(s):  
Girlie Eunice P. Lopez ◽  
Jordan F. Madrid ◽  
Drexel H. Camacho
Keyword(s):  
Catalytic Activity ◽  
Gamma Radiation ◽  
Palladium Nanoparticles ◽  
In Situ Synthesis ◽  
Chemical Transformations ◽  
Efficient Catalyst ◽  
Polypropylene Fabric ◽  
P Immobilization

Immobilization of Pd nanometals on a functionalized non-woven polypropylene fabric offers heterogenous catalytic activity in many chemical transformations and convenient separation from the reaction mixture.

Phosphorus Promoted HZSM-5 Zeolites for the Coupling Transformation of Methanol with 1-Butene to Propylene

2020 ◽  
Author(s):  
Xiao-hua Tang ◽  
Rui-qiang Liu ◽  
Hai-feng Tian ◽  
Hui Li ◽  
fei zha ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Space Velocity ◽  
In Situ Synthesis ◽  
Synthetic Methods ◽  
Incipient Wetness Impregnation ◽  
Large Specific Surface Area ◽  
Reaction Conditions ◽  
Coupling Transformation ◽  
Incipient Wetness

Phosphorus promoted HZSM-5 zeolites (P-HZSM-5) were prepared by synthetic methods of incipient wetness impregnation and in-situ synthesis, respectively. It was characterized by the means of XRD, SEM, BET, TG and NH3-TPD. The P-HZSM-5 zeolite prepared by incipient wetness impregnation has a large specific surface area and pore size, and the weak acidity is remarkably increased. The catalytic activity of P-HZSM-5 for the coupling transformation of methanol with 1-butene to propylene was investigated. Under the reaction conditions of temperature at 550 ℃, pressure at 0.4 MPa, space velocity at 1800 mL/(gcath) and mole ratio of CH3OH/C4H8 to 1:1, the conversion of C4H8 can reach to 75.8%, and the selectivity and yield of propylene are 42.2% and 31.9%, respectively.

Synthesis and catalytic performance of graphene oxide-Au nanorings composites

2019 ◽  
Vol 12 (03) ◽  
pp. 1950028 ◽  
Author(s):  
Tong Shen ◽  
Zhong Li ◽  
Yue Jiang ◽  
Zai-Gang Luo
Keyword(s):  
Graphene Oxide ◽  
Catalytic Activity ◽  
Rate Constant ◽  
Sodium Borohydride ◽  
Catalytic Performance ◽  
Hybrid Structure ◽  
In Situ Synthesis ◽  
Galvanic Replacement ◽  
Hybrid Nanomaterial

A simple and facile method is described for the in situ synthesis of graphene oxide-Ag nanoplates (GO-AgNPs) hybrid structure and then served as sacrificial templates for producing graphene oxide-Au nanorings (GO-AuNRs) by galvanic replacement taken place on the GO surface. The catalytic activity of the resulting hybrid nanomaterial has been investigated for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) with sodium borohydride (NaBH4). The results showed that the rate constant of GO-AuNRs nanomaterials was 0.205[Formula: see text]min[Formula: see text] and the samples showed significant enhancement in catalytic activity.

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