Ultrafast Microwave-Assisted Route to Surfactant-Free Ultrafine Pt Nanoparticles on Graphene: Synergistic Co-reduction Mechanism and High Catalytic Activity

2011 ◽  
Vol 23 (11) ◽  
pp. 2772-2780 ◽  
Author(s):  
Paromita Kundu ◽  
C. Nethravathi ◽  
Parag A. Deshpande ◽  
M. Rajamathi ◽  
Giridhar Madras ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Pt Nanoparticles ◽  
High Catalytic Activity ◽  
Reduction Mechanism ◽  
Microwave Assisted ◽  
Co Reduction

Hollow structured CoSn(OH)6-supported Pt for effective room-temperature oxidation of gaseous formaldehyde

2016 ◽  
Vol 09 (06) ◽  
pp. 1642009 ◽  
Author(s):  
Jing Zhou ◽  
Yong Zhao ◽  
Lifan Qin ◽  
Chen Zeng ◽  
Wei Xiao
Keyword(s):  
Electron Microscopy ◽  
Catalytic Activity ◽  
Room Temperature ◽  
Synergetic Effect ◽  
Hollow Structure ◽  
Pt Nanoparticles ◽  
Hydroxyl Groups ◽  
High Catalytic Activity ◽  
Temperature Oxidation ◽  
X Ray

Uniform CoSn(OH)6 hollow nanoboxes and the derivative with Pt loading (Pt/CoSn(OH)6) were herein synthesized and characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). SEM and TEM analyses showed that CoSn(OH)6 possessed mesoporous hollow structure and Pt nanoparticles with size of 2–8[Formula: see text]nm were uniformly dispersed on the surface of CoSn(OH)6 nanoboxes. The performances of the catalysts for the formaldehyde (HCHO) removal at room temperature were evaluated. These Pt/CoSn(OH)6 catalysts exhibited a remarkable catalytic activity as well as stability for room-temperature oxidative decomposition of gaseous HCHO, while the corresponding CoSn(OH)6 only showed adsorption. The synergetic effect between the highly dispersed Pt nanoparticles and the CoSn(OH)6 nanoboxes with mesoporous hollow structure, a large surface area and abundant surface hydroxyl groups is considered to be the main reason for the observed high catalytic activity of Pt/CoSn(OH)6.

Electrocatalytic Oxidation of Methanol on Platinum/Graphene Hybrid Modified Glassy Carbon Electrode

2012 ◽  
Vol 600 ◽  
pp. 170-173
Author(s):  
Jian Fei Xia ◽  
Yu Feng Wang ◽  
Zong Hua Wang ◽  
Yan Zhi Xia ◽  
Fei Fei Zhang ◽  
...  
Keyword(s):  
Electrode Materials ◽  
Catalyst Support ◽  
Pt Nanoparticles ◽  
Modified Electrodes ◽  
High Specific Surface Area ◽  
High Catalytic Activity ◽  
Modified Glassy Carbon Electrode ◽  
Microwave Assisted ◽  
Oxidation Of Methanol ◽  
Diallyldimethylammonium Chloride

In this article, we proposed a new platinum (Pt) nanoparticles ensemble-on-graphene (G), a new electrode material, which was rapidly prepared by microwave-assisted reduction of PtCl62- on the poly (diallyldimethylammonium chloride)-modified G. The Pt/G hybrid can be directly used as electrode materials. The microstructure and morphology of the prepared film samples are characterized by TEM, and the result showed that Pt nanoparticles with averaged diameter of 2~5 nm appear as dark dots on the surface of graphene. At the same time, the electrocatalytic activities of the Pt/G hybrid modified electrodes towards methanol oxidation is evaluated through cyclic voltammetry. The as-synthesized Pt/G hybrid exhibits high catalytic activity and good stability for the oxidation of methanol, which may be attributed to its excellent electrical conductivity and the high specific surface area of the graphene catalyst support.

Effect of preparation of Fe–Zr–K catalyst on the product distribution of CO2 hydrogenation

RSC Advances ◽  
2015 ◽  
Vol 5 (98) ◽  
pp. 80196-80202 ◽  
Author(s):  
Xiaojuan Su ◽  
Jianli Zhang ◽  
Subing Fan ◽  
Qingxiang Ma ◽  
Tian-Sheng Zhao
Keyword(s):  
Catalytic Activity ◽  
Product Distribution ◽  
Co2 Hydrogenation ◽  
Light Olefins ◽  
High Catalytic Activity ◽  
Homogeneous Precipitation ◽  
Microwave Assisted

Small and uniform Fe–Zr–K particles with mesopores obtained by microwave assisted homogeneous precipitation show high catalytic activity and stability for the selective production of light olefins with low CO from CO2 hydrogenation.

Thermally stable sandwich-type catalysts of Pt nanoparticles encapsulated in CeO2 nanorod/CeO2 nanoparticle core/shell supports for methane oxidation at high temperatures

RSC Advances ◽  
2016 ◽  
Vol 6 (46) ◽  
pp. 40323-40329 ◽  
Author(s):  
Zhiyun Zhang ◽  
Jing Li ◽  
Wei Gao ◽  
Zhaoming Xia ◽  
Yuanbin Qin ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Catalytic Activity ◽  
Methane Oxidation ◽  
High Temperatures ◽  
Pt Nanoparticles ◽  
Core Shell ◽  
High Catalytic Activity ◽  
Thermally Stable ◽  
Sandwich Type ◽  
Nanoparticle Core

A sandwich-type Pt nanocatalyst encapsulated ceria-based core–shell catalyst (CNR@Pt@CNP) was designed and synthesized, which exhibited high catalytic activity and remarkably thermal-stability at high temperatures up to 700 °C.

scholarly journals Effect of Sulfation on Zirconia-Pillared Montmorillonite to the Catalytic Activity in Microwave-Assisted Citronellal Conversion

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Is Fatimah ◽  
Dwiarso Rubiyanto ◽  
Thorikul Huda
Keyword(s):  
Catalytic Activity ◽  
Surface Acidity ◽  
Total Pore Volume ◽  
High Catalytic Activity ◽  
X Ray Diffraction ◽  
Adsorption Method ◽  
X Ray ◽  
Pillared Montmorillonite ◽  
Microwave Assisted ◽  
Tandem Cyclization

Preparation of sulfated zirconia-pillared montmorillonite was carried out in two steps; zirconia pillarization and sulfation to zirconia-pillared montmorillonite. The prepared materials were characterized by using X-ray diffraction (XRD), measurement of the specific surface area, total pore volume and pore size distribution by the N2adsorption method, scanning electron microscopy-energy dispersive X-ray (SEM-EDX), and surface acidity determination by using pyridine adsorption-FTIR analysis. The activity of the materials as catalysts was evaluated for a microwave-assisted conversion of citronellal. The results showed that the prepared materials had a physicochemical character that promoted high catalytic activity to convert citronellal. From varied Zr content and study of the effect of sulfation on the activity, it was found that Zr content and sulfation increase the surface acidity of the material as shown by the higher total conversion and tendency to produce menthol as a product of the tandem cyclization-hydrogenation mechanism.

Complete dehydrogenation of N2H4BH3 with NiM-Cr2O3 (M = Pt, Rh, and Ir) hybrid nanoparticles

2018 ◽  
Vol 6 (42) ◽  
pp. 20746-20752 ◽  
Author(s):  
Jianmin Chen ◽  
Zhang-Hui Lu ◽  
Qilu Yao ◽  
Gang Feng ◽  
Yan Luo
Keyword(s):  
Catalytic Activity ◽  
Hybrid Nanoparticles ◽  
High Catalytic Activity ◽  
Co Reduction

A simple and facile surfactant-aided co-reduction route was developed to fabricate NiM-Cr2O3 (M = Pt, Rh, and Ir) hybrid NPs, which exhibited high catalytic activity for the dehydrogenation of hydrazine borane.

A novel method to decorate Au clusters onto graphene via a mild co-reduction process for ultrahigh catalytic activity

2017 ◽  
Vol 5 (1) ◽  
pp. 230-239 ◽  
Author(s):  
Zhongqian Song ◽  
Weiyan Li ◽  
Fushuang Niu ◽  
Yuanhong Xu ◽  
Li Niu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Catalytic Activity ◽  
Reduced Graphene Oxide ◽  
Reduction Process ◽  
High Catalytic Activity ◽  
Reduction Strategy ◽  
Au Clusters ◽  
Reduced Graphene ◽  
Novel Method ◽  
Co Reduction

A mild co-reduction strategy is exploited to fabricate Au clusters on reduced graphene oxide with low Au loadings for high catalytic activity.

Surface Functionalization of Ordered Mesoporous Hollow Carbon Spheres with Ru Organometallic Compounds as Supports of Low-Pt Content Nanocatalysts for Alkaline Hydrogen and Oxygen Evolution Reactions

MRS Advances ◽  
2020 ◽  
Vol 5 (57-58) ◽  
pp. 2973-2989
Author(s):  
J.C. Martínez-Loyola ◽  
I.L. Alonso-Lemus ◽  
M.E. Sánchez-Castro ◽  
B. Escobar-Morales ◽  
J.R. Torres-Lubián ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
High Performance ◽  
Pt Nanoparticles ◽  
Organometallic Compounds ◽  
High Catalytic Activity ◽  
Carbon Spheres ◽  
Ordered Mesoporous ◽  
Electrochemical Water Splitting ◽  
Hollow Carbon ◽  
Hollow Carbon Spheres

AbstractHerein, we report a methodology that leads to the formation of Ru metallic sites, followed by the development and anchorage of Pt-Ru alloyed nanoparticles on the surface of Ordered Mesoporous Hollow Carbon Spheres (OMHCS). Along with the Ru sites, it is demonstrated that the functionalization promotes the formation of functional groups on the surface of the OMHCS. In a first stage, OMHCS are functionalized with the [(η6-C6H5OCH2CH2OH)RuCl2]2 (Ru-dim) and [(η6-C6H4CH(CH3)2CH3)RuCl2]2 (Ru-cym) organometallic compounds. Afterwards, Pt nanoparticles are dispersed by the microwave-assisted polyol method over the functionalized supports obtaining the low-metal content 5 wt. % Pt/OMHCSRu-dim and Pt/OMHCSRu-cym nanocatalysts. The degree of Ru alloyed is found to be around 35%. The low-Pt content Pt/OMHCSRu-cym and Pt/OMHCSRu-dim exhibit a higher catalytic activity for the Oxygen (OER) and the Hydrogen (HER) Evolution Reactions than the Pt/C benchmark and the Pt/OMHCS nanocatalysts. The overpotential for the OER at 10 mA cm-2 (ηOER) is 300 mV and 210 mV smaller at Pt/OMHCSRu-cym and Pt/OMHCSRu-dim compared to Pt/C, respectively. The corresponding values of the HER at -10 mA cm-2 (ηHER) are 14 and 18 mV smaller, respectively. The high catalytic activity of Pt/OMHCSRu-cym and Pt/OMHCSRu-dim has been attributed in part to the presence of Ru0 and RuO2 species from organometallic functionalization, and the modification of the d-valence band of Pt. Their high performance for the OER and the HER opens new lines of research for the design of nanocatalysts for alkaline electrochemical water splitting.

Confinement of Pt nanoparticles in cage-type mesoporous silica SBA-16 as efficient catalysts for toluene oxidation: the effect of carboxylic groups on the mesopore surface

2019 ◽  
Vol 9 (24) ◽  
pp. 6852-6862
Author(s):  
Hung-Chi Wu ◽  
Tse-Ching Chen ◽  
Canggih Setya Budi ◽  
Pin-Hsuan Huang ◽  
Ching-Shiun Chen ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Mesoporous Silica ◽  
Pt Nanoparticles ◽  
High Catalytic Activity ◽  
Toluene Oxidation ◽  
Carboxylic Groups

In this work, 3D cage-type mesoporous SBA-16 materials functionalized with –COOH groups are used to support Pt metals and provide high catalytic activity for toluene oxidation.

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