Synthesis and Characterization of Pt-Sn Incorporated MCM-41 and Pt Incorporated Sn-SiO2 Type Mesoporous Catalysts for Direct Ethanol Fuel Cell

2010 ◽  
Vol 8 (1) ◽  
Author(s):  
Dilek Varisli ◽  
Tugba Rona ◽  
Niyazi Alper Tapan
Keyword(s):  
Hydrothermal Synthesis ◽  
Oxidation Behavior ◽  
Synthesis Method ◽  
Molar Ratio ◽  
Alloy Formation ◽  
Direct Ethanol Fuel Cell ◽  
One Pot ◽  
Platinum Particles ◽  
Electro Oxidation ◽  
Mcm 41

In this study, Pt-Sn incorporated mesoporous silicate materials were synthesized and characterized, and their activities in ethanol electro-oxidation reaction were tested by cyclic voltammetry. Two groups of catalysts were prepared. In the first group, Pt@MCM-41 and Pt-Sn@MCM-41 were prepared by impregnation of Pt and Sn onto MCM-41 support, which was synthesized by one-pot hydrothermal synthesis method. We adjusted the Pt/Sn molar ratio of 2 in the synthesis solution, and the Pt-Sn alloy formation was recognized beside large platinum particles for Pt-Sn@MCM-41. In the second group of catalysts, Sn-SiO2 was prepared by one-pot hydrothermal synthesis procedure with a Sn/Si molar ratio of 0.014 and was used as support material for Pt. Tin oxide phase was well dispersed through silicate structure and only large Pt particles were found in the XRD analysis of Pt@Sn-SiO2, in which the Pt/Sn ratio was 2. In order to see the effect of Pt/Sn molar ratio on the structural and catalytic activity of the catalyst, Pt@Sn-SiO2(3:2) was prepared by changing the Pt/Sn ratio to 3/2 and obtaining smaller particles for the later one. After electrochemical activity tests in 0.5M H2SO4 and 0.5M H2SO4 + 0.5M C2H5OH electrolyte environments, it was seen that Pt@MCM-41, Pt-Sn@MCM-41, Pt-@Sn-SiO2(3:2) and Pt@Sn-SiO2, exhibit different ethanol electro-oxidation behavior, which is assumed to be due to different pore and crystalline size. Sn-SiO2 supported Pt showed the highest oxidation currents after 0.6V vs. RHE. An ethanol oxidation behavior of Pt@Sn-SiO2(3:2) and polycrystalline Pt was very close at 0.6V vs. RHE.

scholarly journals Low Temperature NH3-SCR over Mn-Ce Oxides Supported on MCM-41 from Diatomite

Materials ◽  
2019 ◽  
Vol 12 (22) ◽  
pp. 3654 ◽  
Author(s):  
Mingxuan Ma ◽  
Xiaoyu Ma ◽  
Suping Cui ◽  
Tingting Liu ◽  
Yingliang Tian ◽  
...  
Keyword(s):  
Molecular Sieves ◽  
Synthesis Method ◽  
Molar Ratio ◽  
Impregnation Method ◽  
Catalyst Carrier ◽  
Nh3 Scr ◽  
Catalytic Material ◽  
Lewis Acidic Sites ◽  
Acidic Sites ◽  
Mcm 41

A series of MCM-41 molecular sieves with different molar ratio of template to silicon were synthesized through hydrothermal synthesis method by using cetyltrimethylammonium bromide (CTAB) as the template, diatomite as the silicon source. By using impregnation method, the Mn-Ce/MCM-41 SCR molecular sieve-based catalysts were prepared. The results observed that when the molar ratio of template to silicon was 0.2:1, the MCM-41 as catalyst carrier has the highest surface area and largest pore volume, it also presented typically ordered hexagonal arrays of uniform channels. The denitration catalytic material based on this carrier has a high number of Lewis acidic sites, and the denitration efficiency can reach more than 93%.

Synthesis Method and its Influence Factors of Hydrotalcite-Like Compounds

2013 ◽  
Vol 690-693 ◽  
pp. 351-354 ◽  
Author(s):  
Hong Dan Xue ◽  
Fu Li Wang ◽  
Guo Li Li ◽  
Pu Liu ◽  
Yong Qing Bai ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Reduction Method ◽  
Ph Value ◽  
Raw Materials ◽  
Sol Gel ◽  
Synthesis Method ◽  
Influence Factors ◽  
Synthetic Methods ◽  
Molar Ratio ◽  
Temperature Reaction

Hydrotalcite-like compounds are a class of anionic lays or layed double hydroxiods (LDHs) which consists of alkalescence, anion-exchanges and memory effect. The synthetic methods of LDHs include coprecipitation, hydrothermal synthesis, mirowave radiation, ion exchange, sol-gel method, roasting reduction method, instant synthesis, etc.The molar ratio of raw materials, pH value,reaction temperature,reaction time and so on have a greater impact on the purity and crystallinity of the LDHs.

Facile synthesis of CuCr2O4 spinel nanoparticles: a recyclable heterogeneous catalyst for the one pot hydroxylation of benzene

2014 ◽  
Vol 4 (12) ◽  
pp. 4232-4241 ◽  
Author(s):  
Shankha S. Acharyya ◽  
Shilpi Ghosh ◽  
Shubhadeep Adak ◽  
Takehiko Sasaki ◽  
Rajaram Bal
Keyword(s):  
Hydrothermal Synthesis ◽  
Synthesis Method ◽  
Facile Synthesis ◽  
One Pot ◽  
Nanoparticle Catalysts ◽  
Hydroxylation Of Benzene ◽  
The One ◽  
Recyclable Heterogeneous Catalyst ◽  
Selective Hydroxylation ◽  
Spinel Nanoparticles

A facile hydrothermal synthesis method is developed to prepare CuCr2O4 spinel nanoparticle catalysts with sizes between 25–50 nm for selective hydroxylation of benzene.

scholarly journals Preparation of SiO2-MnFe2O4 Composites via One-Pot Hydrothermal Synthesis Method and Microwave Absorption Investigation in S-Band

Molecules ◽  
2019 ◽  
Vol 24 (14) ◽  
pp. 2605 ◽  
Author(s):  
Yin ◽  
Zhang ◽  
Wang ◽  
Feng ◽  
Zhao ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Microwave Absorption ◽  
Impedance Matching ◽  
Synthesis Method ◽  
Phase Identification ◽  
Relaxation Processes ◽  
Potential Candidate ◽  
One Pot ◽  
Debye Relaxation ◽  
Attenuation Characteristic

MnFe2O4 NPs are successfully decorated on the surface of SiO2 sheets to form the SiO2-MnFe2O4 composite via one-pot hydrothermal synthesis method. The phase identification, morphology, crystal structure, distribution of elements, and microwave absorbing properties in S-band (1.55~3.4 GHz) of the as-prepared composite were investigated by XRD, SEM, TEM, and Vector Network Analyzer (VNA) respectively. Compared with the pure MnFe2O4 NPs, the as-prepared SiO2-MnFe2O4 composite exhibits enhanced microwave absorption performance in this frequency band due to the strong eddy current loss, better impedance matching, excellent attenuation characteristic, and multiple Debye relaxation processes. The maximum reflection loss of −14.87 dB at 2.25 GHz with a broader −10 dB bandwidth over the frequency range of 1.67~2.9 GHz (1.23 GHz) can be obtained at the thickness of 4 mm. Most importantly, the preparation method used here is relatively simple, hence such composite can be served as a potential candidate for effective microwave absorption in S-band.

Interfacial Synthesis of SiO2 Doped by Polyaniline and its Electrorheological Behavior

2011 ◽  
Vol 179-180 ◽  
pp. 249-252
Author(s):  
Qing Ming Jia ◽  
Shao Yun Shan ◽  
Li Hong Jiang ◽  
Ya Ming Wang
Keyword(s):  
Silicone Oil ◽  
Synthesis Method ◽  
Tetraethyl Orthosilicate ◽  
Molar Ratio ◽  
X Ray Diffraction ◽  
One Pot ◽  
X Ray ◽  
Sem Image ◽  
Interfacial Synthesis ◽  
Er Fluid

SiO2 doped by polyaniline for application in electrorheological (ER) fluid was prepared by using a simple one-pot interfacial synthesis method. Scanning electron microscopy (SEM) image shows that the morphologies of SiO2 may be changed from spherical to fibroid structure by changing the molar ratio of tetraethyl orthosilicate(TEOS) and aniline. X-ray diffraction (XRD) proves that polyaniline does not change the crystallinity of SiO2. The ER behaviors of SiO2 doped by polyaniline in silicone oil are investigated with different doping degrees under different shear rate, and the results show that properly doping polyaniline improves electrorheological behavior of SiO2.

Study on the selective oxidation of methane over highly dispersed molybdenum-incorporated KIT-6 catalysts

2021 ◽  
Author(s):  
Pei Chen ◽  
Zean Xie ◽  
Zhen Zhao ◽  
Jianmei Li ◽  
Bonan Liu ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Mesoporous Silica ◽  
Selective Oxidation ◽  
Synthesis Method ◽  
One Pot ◽  
Oxidation Of Methane ◽  
Highly Dispersed

A series of molybdenum-incorporated mesoporous silica (Mo-KIT-6) catalysts were successfully synthesized by a one-pot hydrothermal synthesis method and were applied in the selective oxidation of methane to formaldehyde using oxygen...

Nitrogen Doped and Functionalized Carbon Materials as Supports for Catalysts in Electro-Oxidation of Methanol

2014 ◽  
Vol 93 ◽  
pp. 41-49 ◽  
Author(s):  
M.J. Lázaro ◽  
C. Alegre ◽  
M.J. Nieto-Monge ◽  
D. Sebastián ◽  
M.E. Gálvez ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Carbon Materials ◽  
Synthesis Method ◽  
Electrochemical Analysis ◽  
Molar Ratio ◽  
Synthesis Process ◽  
X Ray ◽  
Nitrogen Doped ◽  
Oxidation Of Methanol ◽  
Electro Oxidation

The objective of this work is to study the behavior of Nitrogen-doped carbons as supports of catalysts for the electro-oxidation of methanol. Two carbon materials have been considered: a) carbon xerogels (CXG), highly mesoporous, whose porosity and pore size distribution are easily performed during the synthesis method; b) carbon nanofibers (CNF), which have a high electrical conductivity, good behavior in high temperature conditions and resistance to acid/basic media. Meanwhile, a commercial carbon black (Vulcan XC72R) which is commonly used in manufacturing of electrocatalysts fuel cells was used for comparison. Nitrogen was introduced into the CXG during the synthesis process, what is commonly referred as doping, by including melamine as a reactant. In contrast, N-groups were created over CNF by post-treatment with: ammonia (25%), urea (98%), melamine (99%) and ethylenediamine (99.5%), with a carbon: nitrogen molar ratio 1:0.6. N-containing carbon materials were characterized by elemental analysis, nitrogen adsorption, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), SEM-EDX and TEM to determinate the amount and forms of nitrogen introduced. Pt-catalysts were prepared by the microemulsion method. The influence of the nitrogen doping and functionalization on the catalytic behavior in the electrochemical oxidation of methanol was evaluated by different physicochemical and electrochemical analysis.

One-pot synthesis of Ag@silicalite-1 with different silver amine complexes and the performance for styrene oxidation

2021 ◽  
Author(s):  
Hongdan Zhang ◽  
Zhiwei Wang ◽  
Weidu Wang ◽  
Chunyang Wu ◽  
Tingting Lu ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Synthesis Method ◽  
Complex Mixtures ◽  
X Ray Diffraction ◽  
Styrene Oxidation ◽  
One Pot ◽  
X Ray ◽  
Amine Complexes ◽  
One Pot Synthesis ◽  
Amine Complex

A facile one-pot strategy was used to successfully synthesize Ag@silicalite-1 using different silver amine complex mixtures as precursors via a hydrothermal synthesis method. Ag@silicalite-1 was characterized by X-ray diffraction (XRD),...

Preparation and Structure of BiVO4-Graphene Composites

2014 ◽  
Vol 905 ◽  
pp. 101-104 ◽  
Author(s):  
Bin Zhang ◽  
Ya Ling Wang ◽  
Lang Huan Huang ◽  
Shao Zao Tan
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Electron Microscope ◽  
Hydrothermal Synthesis ◽  
Emission Spectroscopy ◽  
Synthesis Method ◽  
Photoelectron Emission ◽  
One Pot ◽  
X Ray ◽  
Transmission Electron

BiVO4-graphene composites were prepared through a one-pot hydrothermal synthesis method, and the structure were investigated by Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron emission spectroscopy (XPS), X-ray powder diffraction (XRD) and Transmission electron microscope (TEM). The results show that BiVO4-graphene composites are successfully prepared, and BiVO4 particles are almost uniformly deposited on the surface of graphene.

Synthesis of MnNi–SAPO-34 by a one-pot hydrothermal method and its excellent performance for the selective catalytic reduction of NO by NH3

2017 ◽  
Vol 7 (21) ◽  
pp. 4984-4995 ◽  
Author(s):  
Rui Li ◽  
Zhibin Li ◽  
Liqiang Chen ◽  
Yongli Dong ◽  
Shibo Ma ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Selective Catalytic Reduction ◽  
Hydrothermal Method ◽  
Strong Interaction ◽  
Catalytic Reduction ◽  
Synthesis Method ◽  
Excellent Performance ◽  
One Pot ◽  
Reduction Of No ◽  
Ni Species

MnNi–SAPO-34 with Mn and Ni incorporated in the framework of SAPO-34 prepared by a one-pot hydrothermal synthesis method exhibits excellent NH3-SCR activity, which is attributed to the strong interaction between the Mn and Ni species.

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