Nanostructured OMO type Manganese Oxide – as Novel Support for Palladium towards Electrooxidation of Methanol and Ethylene Glycol

2012 ◽  
Vol 15 (4) ◽  
pp. 249-254 ◽  
Author(s):  
Ramanujam Kannan ◽  
Kulandaivelu Karunakaran ◽  
Samuel Vasanthkumar
Keyword(s):  
Catalytic Activity ◽  
Ethylene Glycol ◽  
Manganese Oxide ◽  
Reduction Method ◽  
Pd Nanoparticles ◽  
Active Oxygen ◽  
Electrolytic Solution ◽  
X Ray ◽  
Supporting Material ◽  
Electrooxidation Of Methanol

Octahedral molecular sieve type manganese oxide (OMO) was synthesized by the ultra sonic assisted hydrothermal method, and was subsequently used as supportive material for palladium (Pd) metal towards the electrooxidation of methanol and ethylene glycol. The Pd nanoparticles were coated on the OMO by insitu reduction method. Low quantity of 5% Pd metal was used and the electrocatalytic activity was studied. The prepared OMO and the OMO/Pd nanocomposite were characterized by powder X–ray diffractogram (XRD), Scanning Electron Microscopy (SEM), Energy dispersive X–ray spectroscopy (EDS) and electrochemical methods. These studies demonstrated that the OMO can act as a good catalyst supporting material. The OMO helps to enhance the catalytic activity of Pd metal by supplying the active oxygen, which is extracted from the electrolytic solution. The electrooxidation of EG shows improved catalytic activity.

scholarly journals Sintesis Nanopartikel Mangan Oksida dengan Metode Sol Gel dan Uji Aktivitas Katalitik terhadap Degradasi Zat Warna Rhodamin B

2020 ◽  
Vol 21 (2) ◽  
pp. 190
Author(s):  
Sri Rahayu ◽  
Netti Herawati ◽  
Mohammad Wijaya
Keyword(s):  
Catalytic Activity ◽  
Ethylene Glycol ◽  
Manganese Oxide ◽  
Sol Gel ◽  
Degradation Process ◽  
Oxide Nanoparticles ◽  
X Ray Diffraction ◽  
Manganese Oxide Nanoparticles ◽  
X Ray ◽  
Rhodamin B

Telah dilakukan penelitian tentang sintesis nanopartikel mangan oksida menggunakan prekursor KMnO4 dengan metode sol gel, dengan menambahkan aditif etilendiamin dan etilen glikol yang berperan sebagai agen penstabil, selanjutnya menguji aktivitas katalitik dari mangan oksida tersebut terhadap proses degradasi warna rhodamin B. Penelitian ini bertujuan untuk mengetahui pengaruh penambahan zat aditif terhadap ukuran dan bentuk nanopartikel yang dihasilkan serta kemampuannya sebagai katalis dalam proses degradasi zat warna rhodamin B. Nanopartikel yang diperoleh, dikarakterisasi menggunakan XRD (X-Ray Diffraction) dan SEM (Scanning Elektron Microscope) serta penentuan aktivitas katalitik dalam proses degradasi terhadap zat warna rhodamin B dengan spektrofotometer UV-Vis. Hasil penelitian menunjukkan sintesis nanopartikel menggunakan aditif etilendiamin lebih baik dibandingkan dengan aditif etilen glikol karena ukuran nanopartikel berkisar antara 5,66-33,38 dalam bentuk tetragonal. Morfologi nanopartikel mangan oksida terlihat berbentuk bulat yang seragam. Nanopartikel mangan oksida hasil sintesis mampu mempercepat proses degradasi warna rhodamin B dengan persentase degradasi mencapai 85,6%. Kata kunci: Nanopartikel, Mangan Oksida , Sol gel dan Rhodamin B ABSTRACT Research has been carried out on the synthesis of manganese oxide nanoparticles using KMnO4 precursors with the sol gel method, by adding ethylenediamine and ethylene glycol additives which act as stabilizing agents, then tested the catalytic activity of the manganese oxide on the degradation process of Rhodamine B. This study aims to determine the effect of adding substances additives on the size and shape of the nanoparticles were produced and their ability as catalysts in the degradation process of Rhodamin B. Nanoparticles were obtained, characterized using XRD (X-Ray Diffraction)and SEM (Scanning Elektron Microscope)and determination of catalytic activity in the degradation process of rhodamine B dyes with UV-Vis spectrophotometer. The results showed that the synthesis of nanoparticles using ethylenediamine additives was better than ethylene glycol additives because the size of the nanoparticles ranged from 5.66 to 33.38 in the tetragonal form. The morphology of manganese oxide nanoparticles looks uniform in shape. Manganese oxide nanoparticles can accelerate the degradation process of Rhodamin B with a percentage of degradation reaching 85.6%. Keywords: Nanoparticles, Manganese Oxide, Sol gel and Rhodamin B

Facile synthesis of Pt–Pd nanodendrites and their superior electrocatalytic activity

2014 ◽  
Vol 2 (12) ◽  
pp. 4384-4390 ◽  
Author(s):  
Jing-Jing Lv ◽  
Jie-Ning Zheng ◽  
Shan-Shan Li ◽  
Li-Li Chen ◽  
Ai-Jun Wang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Ethylene Glycol ◽  
Electrocatalytic Activity ◽  
Reduction Method ◽  
Chemical Reduction ◽  
Alkaline Media ◽  
High Catalytic Activity ◽  
Chemical Reduction Method ◽  
Facile Synthesis ◽  
Electrooxidation Of Methanol

Porous Pt–Pd nanodendrites were fabricated by a co-chemical reduction method using both PVP and urea as the co-stabilizing and co-structure-directing agents. The Pt–Pd nanodendrites displayed high catalytic activity and stability toward the electrooxidation of methanol and ethylene glycol in alkaline media.

Magnetic Pd/Fe3O4 Composite: Synthesis, Structure, and Catalytic Activity

2014 ◽  
Vol 67 (10) ◽  
pp. 1387 ◽  
Author(s):  
Shi-Qiang Bai ◽  
Lu Jiang ◽  
Sheng-Li Huang ◽  
Ming Lin ◽  
Shuang-Yuan Zhang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Catalytic Activity ◽  
Reduction Process ◽  
Pd Nanoparticles ◽  
Pincer Ligands ◽  
X Ray Diffraction ◽  
X Ray ◽  
Good Thermal Stability ◽  
Transmission Electron

Composite Pd/Fe3O4 (1) was designed and synthesised by immobilization of tridentate pincer ligands with triethoxysilane groups on Fe3O4 nanoparticles, PdII complexation, and in-situ reduction process. The composite was characterised by transmission electron microscopy, scanning electron microscopy energy-dispersive X-ray spectroscopy, powder X-ray diffraction, vibrating sample magnetometer, Fourier transform infrared spectroscopy, thermogravimetric analysis, and Brunauer–Emmett–Teller analysis. The composite featured Pd nanoparticles of ~2–4 nm, exhibited good thermal stability and hydrophilic property as well as excellent catalytic activity towards the reduction of 4-nitrophenol to 4-aminophenol in water.

scholarly journals An in situ XAS study of the activation of precursor-dependent Pd nanoparticles

2018 ◽  
Vol 20 (18) ◽  
pp. 12700-12709 ◽  
Author(s):  
Christian W. Lopes ◽  
Jose L. Cerrillo ◽  
Antonio E. Palomares ◽  
Fernando Rey ◽  
Giovanni Agostini
Keyword(s):  
Catalytic Activity ◽  
Absorption Spectroscopy ◽  
Pd Nanoparticles ◽  
X Ray ◽  
In Situ Xas ◽  
Inorganic Supports ◽  
X Ray Absorption

The activation of precursor-dependent Pd nanoparticles was comprehensively followed by in situ X-ray absorption spectroscopy on two inorganic supports for rationalizing the final catalytic activity.

Palladium Supported on Mesoporous Silica via a Two-Step Method as an Efficient Catalyst for Suzuki-Miyaura Coupling Reactions

2014 ◽  
Vol 1035 ◽  
pp. 89-95
Author(s):  
Pei Yu Wang ◽  
Guo Heng Zhang ◽  
Hai Yan Jiao ◽  
Xiao Ping Zheng
Keyword(s):  
Catalytic Activity ◽  
Hydrothermal Synthesis ◽  
Palladium Nanoparticles ◽  
Reduction Method ◽  
Pd Nanoparticles ◽  
Coupling Reactions ◽  
Step Method ◽  
Efficient Catalyst ◽  
Catalytic Activities ◽  
Highly Dispersed

In this paper, palladium-containing SBA-15 (Pd/SBA-15) was synthesized via a two-step method. In this procedure, Pd nanoparticles of 3-5 nm in size have been synthesized by formalin reduction method and incorporated into mesoporous SBA-15 silica during hydrothermal synthesis. The resulting nanocomposite with 1.20 wt% Pd loading was achieved with highly dispersed and uniform palladium nanoparticles. The catalytic activity of the Pd/SBA-15 nanocomposite was used as a catalyst for the Suzuki-Miyaura coupling reactions. The Pd/SBA-15 nanocomposite exhibited excellent catalytic activities and reuse ability in air for the Suzuki-Miyaura coupling reactions.

scholarly journals Hydrothermal redox synthesis of cobalt and manganese spinels using metal nitrates

2019 ◽  
Vol 60 (10) ◽  
pp. 116-123
Author(s):  
Aygul A. Mammadova ◽  
◽  
Sevinj N. Osmanova ◽  
Sabira A. Agayeva ◽  
Aydar A. Mejidov ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Manganese Oxide ◽  
Spinel Phase ◽  
Manganese Carbonate ◽  
Average Particle ◽  
Particle Sizes ◽  
Reaction Products ◽  
X Ray ◽  
Temperature Range ◽  
Hydrothermal Reduction

The hydrothermal reduction of cobalt, manganese and lithium nitrates with ethylene glycol was studied in the temperature range 100-270 оС in order to obtain nanostructured spinels. The phase composition, particle sizes of the reaction products, and their morphology studied by using IR spectroscopy, X-ray diffractometry, and scanning electron microscopy. We found that the nature of the reaction product of manganese and cobalt nitrates with ethylene glycol (EG) depends on the reaction temperature, the ratio of metal nitrate: ethylene glycol and reaction time. In excess of the reducing agent at temperatures up to 140 оС, observed the formation of metal oxalates. The main product of hydrothermal reduction of manganese nitrate with ethylene glycol at temperatures of 150 оC and 180 оC is manganese oxide Mn3O4 (Hausmanite). At 200 оС obtained the mixture of manganese oxide (Mn3O4) and carbonate (MnCO3). In accordance with the data of X-ray phase analysis at 220 оС and 240 оС, the only reaction product in both cases is manganese carbonate. It was obtained two types of structures on electron-microscopic images of the non-calcined sample at 200 оC: needle-shaped and spherical clusters. It can be assumed that these structures belong to the phases Mn3O4 (Hausmanite) and manganese carbonate MnCO3, respectively. When reduced cobalt nitrate with ethylene glycol in the temperature range 120-220 оC, gives a main amorphous phase, and on X-ray diffraction patterns are observed weak reflections corresponding to cobalt oxide Co3O4. It was shown that upon calcination (at 750 оС) of the samples during the reduction of the mixture of cobalt and manganese nitrates, was obtained the spinel phase of the composition (Co,Mn)(Co,Mn)2O4. In a similar way were obtained Li2CoMn3O8 and LiCoO2 phases (with average particle sizes of 42 nm and 30 nm), which can be used as cathodes in lithium batteries.

scholarly journals Pd Nanoparticles Supported on Amine-Functionalized MgAl Layered Double Hydroxides for Solvent-Free Aerobic Oxidation of Benzyl Alcohol

Catalysts ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1038 ◽  
Author(s):  
Xiufeng Shi ◽  
Bin Xing ◽  
Wenya Guo ◽  
Huifang Zhang ◽  
Binbin Fan ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Benzyl Alcohol ◽  
Layered Double Hydroxides ◽  
Pd Nanoparticles ◽  
Solvent Free ◽  
X Ray ◽  
Amine Functionalized ◽  
Oxidation Of Benzyl Alcohol ◽  
Surface Basicity ◽  
Double Hydroxides

Pd nanoparticles (NPs) supported on amine-functionalized layered double hydroxides (LDHs) (Pd/NH2-LDH-NS) were successfully obtained by implanting aminopropyltriethoxysilane (APTS) on MgAl LDH nanosheets (LDH-NS), followed by impregnating [Pd(NH3)4]Cl2 and reduction with NaBH4. The physicochemical characteristics of the obtained Pd/NH2-LDH-NS were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR),, N2 adsorption–desorption, inductive coupled plasma (ICP), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy(XPS), and their catalytic performance was tested in the selective oxidation of benzyl alcohol with molecular oxygen under solvent-free and base-free conditions. The results showed that the implanted –NH2 groups can promote the dispersion of the supported Pd NPs via complexation of the implanted –NH2 groups to Pd NPs, and they can increase the surface basicity of the catalysts, thus enhancing the catalytic activity and selectivity to benzylaldehyde. Pd/NH2-LDH-NS exhibited enhanced catalytic activity (31.6%) and selectivity (>98%) compared to the corresponding Pd/LDH-NS, Pd/LDH, Pd/SiO2, and Pd/Al2O3. Moreover, Pd/NH2-LDH-NS was remarkably stable and could be reused at least four times without a significant loss in activity and selectivity.

A Comparative Study of the Catalytic Performance of Pt-Based Bi and Trimetallic Nanocatalysts Towards Methanol, Ethanol, Ethylene Glycol, and Glycerol Electro-Oxidation

2020 ◽  
Vol 20 (10) ◽  
pp. 6274-6285 ◽  
Author(s):  
Hadla S. Ferreira ◽  
Martin Gocyla ◽  
Hadma S. Ferreira ◽  
Rennan G. O. Araujo ◽  
Caio V. S. Almeida ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Fuel Cells ◽  
Ethylene Glycol ◽  
Inductively Coupled Plasma ◽  
Catalytic Performance ◽  
X Ray ◽  
Onset Potential ◽  
Oxidation Of Methanol ◽  
Catalyst Composition ◽  
Electro Oxidation

Carbon-supported platinum is used as an anode and cathode electrocatalyst in low-temperature fuel cells fueled with low-molecular-weight alcohols in fuel cells. The cost of Pt and its low activity towards the complete oxidation of these fuels are significant barriers to the widespread use of these types of fuel cells. Here, we report on the development of PtRhNi nanocatalysts supported on carbon made using a reduction chemistry method with different atomic rates. The catalytic activity of the developed catalysts towards the electro-oxidation of methanol, ethanol, ethylene glycol, and glycerol in acidic media was studied. The obtained catalysts performances were compared with both commercial Pt/C and binary Pt75Ni25/C catalyst. The nanostructures were characterized, employing inductively coupled plasma optical emission spectrometer, X-ray diffraction, scanning transmission electron microscopy, and energy-dispersive X-ray spectroscopy. The binary catalyst presents a mean particle size of around 2 nm. Whereas the ternary catalysts present particles of similar size and with some large alloy and core–shell structures. The alcohol oxidation onset potential and the current density measured after 3600 s of chronoamperometry were used to classify the catalytic activity of the catalysts towards the oxidation of methanol, ethanol, ethylene glycol, and glycerol. The best PtRhNi/C catalyst composition (i.e., Pt43Rh43Ni14/C) presented the highest activity for alcohols oxidation compared with all catalysts studied, indicating the proper tuning composition influence in the catalytic activity. The enhanced activity of Pt43Rh43Ni14/C can be attributed to the synergic effect of trimetallic compounds, Pt, Ni, and Rh.

Use of Carbon Nanomaterials as a Catalyst Support in Fuel Cells

2016 ◽  
Vol 879 ◽  
pp. 1882-1888
Author(s):  
Yoshiyuki Suda
Keyword(s):  
Catalytic Activity ◽  
Carbon Nanomaterials ◽  
Reduction Method ◽  
Catalyst Support ◽  
X Ray Diffraction ◽  
X Ray ◽  
Catalytic Activities ◽  
Transmission Electron ◽  
Ptru Catalyst ◽  
Different Shapes

PtRu or Pt catalysts were supported on four types of carbon nanomaterials with different shapes, sizes, and graphitic and electrical properties, and their resulting catalytic activities were evaluated by electrochemical methods. The carbon nanomaterials used included two types of particles: Arc Black (AcB) and Vulcan XC-72R (Vulcan), and two types of nanofibers: carbon nanocoils (CNC) and VGCF-X. Pt and Ru were loaded onto the nanomaterials by a reduction method using sodium borohydride. Transmission electron microscopy and X-ray diffraction (XRD) revealed the PtRu catalyst particles to be 4–6 nm in diameters. The shifts in the Pt (111) XRD peaks of the catalysts on CNC and VGCF-X were larger than those on AcB and Vulcan, indicating a higher degree of alloying between Pt and Ru. The diameters of the CNC-supported Pt and PtRu catalyst particles had the narrowest distributions and were constant within the range of catalyst loadings investigated. Electrochemical studies of the catalysts during methanol oxidation were carried out using cyclic voltammetry. The catalyst particles supported on CNC and VGCF-X exhibited higher catalytic activity than those on AcB and Vulcan. The effect of the surface area of the carbon nanomaterials on the catalytic activity is discussed.

scholarly journals Pt/Fe co-loaded mesoporous zeolite beta for CO oxidation with high catalytic activity and water resistance

RSC Advances ◽  
2019 ◽  
Vol 9 (48) ◽  
pp. 28089-28094 ◽  
Author(s):  
Qinru Li ◽  
Xiaoxia Zhou ◽  
Wanpeng Zhao ◽  
Chunlei Peng ◽  
Huixia Wu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Ion Exchange ◽  
Ethylene Glycol ◽  
Co Oxidation ◽  
Water Resistance ◽  
Reduction Method ◽  
Zeolite Beta ◽  
High Catalytic Activity ◽  
Mesoporous Zeolite ◽  
Highly Dispersed

A series of Pt/Fe co-loaded mBeta catalysts with highly dispersed Pt species have been successfully prepared by an ion exchange and subsequent ethylene glycol reduction method, and show excellent catalytic activity and durability in CO oxidation.

Sign in / Sign up

Export Citation Format

Share Document