Can microwave assisted in situ reduction of supported Pt nanoparticles challenge the chemical method in controlling the dispersion profile-catalytic performance relationship?

RSC Advances ◽  
2015 ◽  
Vol 5 (67) ◽  
pp. 54460-54470 ◽  
Author(s):  
Salah A. Hassan ◽  
Heba M. Gobara ◽  
Mohamed M. Gomaa ◽  
Rasha S. Mohamed ◽  
Fikry H. Khalil
Keyword(s):  
Chemical Method ◽  
Solution Method ◽  
Silica Surface ◽  
Pt Nanoparticles ◽  
Catalytic Performance ◽  
In Situ Reduction ◽  
Reduction Step ◽  
Dispersion Profile ◽  
Microwave Assisted

In this comparative study of dispersion profile-catalytic performance relationships, Pt (of 0.3, 0.6 and 0.9 wt%) was supported on mesoporous silica surface via microwave assisted solution method or rotary chemical evaporation method in the in situ reduction step.

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 Electrochemically Exfoliated Graphite/Cu/Cu2O Composites and Their Photocatalytic Activity

POSITRON ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 34
Author(s):  
Lia Destiarti ◽  
Oktaviardi Bityasmawan Abdillah ◽  
Retno Maharsi ◽  
Octia Floweri ◽  
Ferry Iskandar
Keyword(s):  
Photocatalytic Activity ◽  
Photocatalytic Performance ◽  
Reduction Method ◽  
Degradation Process ◽  
Sem Analysis ◽  
Exfoliated Graphite ◽  
In Situ Reduction ◽  
Microwave Assisted ◽  
Copper Addition

In this work, the photocatalytic performance of electrochemically exfoliated graphite (EG) with low copper addition (≤ 5 wt.%) was studied. Composites of EG/Cu/Cu2O were successfully prepared by microwave-assisted in situ reduction method. FTIR spectra of the samples showed that the main functional groups of graphite were detected in the samples. XRD characterization further proved the presence of EG, Cu, and Cu2O in the samples. The higher proportion of Cu2O presented in the samples prepared with a higher amount of Cu2+. SEM analysis showed that Cu2O/Cu particles were homogeneously deposited on the surface of EG. The composites of EG, Cu, and Cu2O with a varied amount of Cu (1 and 5 wt. %) in EG / Cu2+ mixture were examined as photocatalyst in the degradation process of Rhodamine B (RhB). The photocatalytic degradation of RhB was analysed by observing its decolorization within a set time of irradiation. UV-Vis analysis revealed that the degradation of RhB in EG/Cu/Cu2O A and B for 105 minutes was 26 and 35 %, respectively. The result demonstrates that the sample with a larger amount of Cu2O (sample B, Cu 5 wt.%) shows higher photocatalytic activity in the degradation of RhB.

New Macrocyclic Ligands. VII. The Synthesis of Mixed-Donor Spiro-Linked Macrocycles

1995 ◽  
Vol 48 (12) ◽  
pp. 1917 ◽  
Author(s):  
J Kim ◽  
LF Lindoy ◽  
OA Matthews ◽  
GV Meehan ◽  
J Nachbaur ◽  
...  
Keyword(s):  
Comparative Studies ◽  
Macrocyclic Ligands ◽  
In Situ Reduction ◽  
Reduction Step ◽  
Double Ring ◽  
Single Ring ◽  
Ether Oxygen ◽  
Methylene Groups ◽  
Second Procedure

The syntheses of five new spiro -linked bis-macrocyles, incorporating four ether oxygen and four or six secondary nitrogen heteroatoms , are reported. Two strategies were employed-the first involved the condensation of a spiro tetraaldehyde with 2 equiv. of ethane-1,2-diamine or propane-1,3-diamine or 2,2′-diaminodiethylamine followed by in situ reduction of the resulting intermediate tetraimines . The second procedure began with pentaerythrityl tetraamine [C(CH2NH2)4] which was then condensed with 2 equiv. of a dialdehyde moiety in which two ether oxygen atoms, bridged by either two or three methylene groups, were incorporated in its backbone. A related in situ reduction step to that employed in the first procedure then yielded the required double-ring macrocycles. For use in comparative studies, the corresponding single-ring macrocycles were also synthesized where they had not been reported previously.

Insight into Copper-Based Catalysts: Microwave-Assisted Morphosynthesis, In Situ Reduction Studies, and Dehydrogenation of Ethanol

ChemCatChem ◽  
2011 ◽  
Vol 3 (5) ◽  
pp. 839-843 ◽  
Author(s):  
Diogo P. Volanti ◽  
André G. Sato ◽  
Marcelo O. Orlandi ◽  
José M. C. Bueno ◽  
Elson Longo ◽  
...  
Keyword(s):  
In Situ Reduction ◽  
Microwave Assisted ◽  
Insight Into ◽  
Dehydrogenation Of Ethanol

One-pot microwave-assisted in situ reduction of Ag+and Au3+ions by Citrus limon extract and their carbon-dots based nanohybrids: a potential nano-bioprobe for cancer cellular imaging

RSC Advances ◽  
2016 ◽  
Vol 6 (105) ◽  
pp. 103482-103490 ◽  
Author(s):  
P. A. Sajid ◽  
S. Shashank Chetty ◽  
S. Praneetha ◽  
A. Vadivel Murugan ◽  
Yogesh Kumar ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Cellular Imaging ◽  
Microwave Assisted Synthesis ◽  
Citrus Limon ◽  
In Situ Reduction ◽  
One Pot ◽  
Microwave Assisted

In situreduction and microwave-assisted synthesis of Ag/C-dot and Au/C-dot nanohybrids using natural lemon extract for cancer cellular imaging applications.

Enhanced catalytic performance of a PdO catalyst prepared via a two-step method of in situ reduction–oxidation

2017 ◽  
Vol 53 (45) ◽  
pp. 6160-6163 ◽  
Author(s):  
Wei Hu ◽  
Guang-Xia Li ◽  
Jian-Jun Chen ◽  
Fu-Jin Huang ◽  
Yang Wu ◽  
...  
Keyword(s):  
Catalytic Performance ◽  
In Situ Reduction ◽  
Step Method ◽  
Enhanced Activity

A Pd-based catalyst prepared by a controllable two-step method of in situ reduction–oxidation showed significantly enhanced activity and selectivity.

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