scholarly journals PREPARATION AND CHARACTERIZATION THE NON-SULFIDED METAL CATALYST: Ni/USY and NiMo/USY

2010 ◽  
Vol 9 (2) ◽  
pp. 177-183
Author(s):  
Khoirina Dwi Nugrahaningtyas ◽  
Wega Trisunaryanti ◽  
Triyono Triyono ◽  
Nuryono Nuryono ◽  
Dian Maruto Widjonarko ◽  
...  
Keyword(s):  
Catalytic Reaction ◽  
Metal Content ◽  
Zeolite Y ◽  
The Other ◽  
Metal Catalyst ◽  
Impregnation Method ◽  
Sulfide Catalysts ◽  
Sulfided Catalyst

The two-new catalysts had been prepared by using the impregnation method according to Nugrahaningtyas [6] and Li [4]. One catalyst is of Nickel (Ni), supported on Ultra Stable Zeolite Y (USY), whereas the other one is NiMo supported on same supporting agent. These new catalysts are expected to be more effective when applied on the hydrotreatment reaction in standpoint of its capabilities on removing the unwanted-heteroatom. Characterization those two types of catalysts then carried out by using the criteria of acidity, porosity and, metal content. The result shows that these non-sulfide catalysts have several good characters that supporting their usefulness in hydrotreatment-catalytic reaction. In addition, catalyst NiMo/USY - 1 performs many ideal criteria as the best functional catalyst.   Keywords: Non-sulfided Catalyst, hydro-treating, preparation, characterization

Preparation of Monometallic Catalysts on Carbon Support for Synthesis of Biodiesel Fuel

2019 ◽  
Vol 824 ◽  
pp. 219-224
Author(s):  
Tripob Longprang ◽  
Parncheewa Udomsap ◽  
Nuwong Chollacoop ◽  
Masayoshi Fuji ◽  
Apiluck Eiad-Ua
Keyword(s):  
Hydrothermal Process ◽  
Carbon Support ◽  
Metal Catalyst ◽  
Biodiesel Fuel ◽  
Partial Hydrogenation ◽  
Support Surface ◽  
Impregnation Method ◽  
Hydrothermal Temperature ◽  
Support Materials ◽  
Monometallic Catalysts

Monometallic catalysts have been prepared on nano-porous carbon support materials by way of hydrothermal carbonization of Cattail (genus Typha) leaves. The catalysts are for synthesis of biodiesel fuel. This research studied the effect of hydrothermal temperature (at 160-200 °C), reaction time (4-24 h) and the presence of KOH on the activated porosity of a carbon support. Then the type of loaded metal catalyst (Mn, Fe, Co, Ni, Cu and Pb), placed on the carbon support by an impregnation method, was investigated. This led to partial hydrogenation catalytic activity forming biodiesel. The carbonization temperature was studied in the range 500-900 °C for 2 hours. The samples were characterized by scanning electron microscopy, nitrogen sorption, fourier transform infrared spectroscopy and X-ray diffraction. The results indicated that the hydrothermal process at 200 °C for 12 hours exhibited the highest surface area, porosity and pore volume. This led to an appropriate distribution of metal on the carbon support surface.

scholarly journals Influence of cultivar on the content of selected minerals in red beet roots (Beta vulgaris L.)

2016 ◽  
Vol 28 (2) ◽  
pp. 143-150 ◽  
Author(s):  
Zofia Nizioł-Łukaszewska ◽  
Maria Gawęda
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Metal Content ◽  
The Other ◽  
Red Beet ◽  
Lower Ability ◽  
Growing Conditions ◽  
Set Up ◽  
The University ◽  
The Impact

Abstract Beetroot is a vegetable that accumulate heavy metals. This is largely dependent on the cultivar, methods and growing conditions. The aim of the study was to determine the composition of elements in the roots of 15 cultivars of red beet. The analysis assessed the content of macroelements (Na, P) and heavy metals (Cd, Cr, Mn, Zn). Most soils of the Lesser Poland region are exposed to the impact of industrial and transportation pollution. The soils of this region are characterized by strong acidification as well as natural or increased heavy metal content. The experiment was set up at the experimental field of the Department of Vegetable and Medicinal Plants of the University of Agriculture in Krakow, in 2009-2010. On the basis of the performed analysis, ‘Opolski’ was chosen as the cultivar that was characterized by a high content of macroelements and lower ability to accumulate heavy metals than the other tested cultivars. The lowest ability to accumulate heavy metals (Cd and Cr) was found in the cases of cultivars with cylindrical root shapes, such as Rywal or Opolski. One can indicate such cultivars as Astar F1 or Nabab F1 as cultivars recommended for cultivation in ecologically threatened areas.

scholarly journals Zinc Oxide Supported onto Biogenic Silica from Gigantochloa atroviolacea Leaves: Preparation, Characterization and Antibacterial Activity

2019 ◽  
Vol 31 (10) ◽  
pp. 2197-2200
Author(s):  
Elsa Sriwahyuni ◽  
Anti Kolonial Prodjosantoso ◽  
Dewi Sasmita
Keyword(s):  
Zinc Oxide ◽  
Antibacterial Activity ◽  
Staphylococcus Epidermidis ◽  
Biogenic Silica ◽  
Antibacterial Activities ◽  
The Other ◽  
Raw Material ◽  
Zinc Salt ◽  
Impregnation Method ◽  
Bamboo Leaves

Bamboo rod is a well known raw material utilized to make houses, papers, handicrafts, chopsticks and medicines. On the other hand, the utilzation of leaves, which are often considered as garbages, receive less attentions. Even though, bamboo leaves are good sources of SiO2 or silica. This work reports the preparation of zinc oxide (ZnO) supported onto biogenic silica (SiO2) from leaves of Gigantochloa atroviolacea, characterization and the antibacterial activities of ZnO@SiO2 against Staphylococcus epidermidis. The ZnO was supported onto biogenic SiO2 by using impregnation method of SiO2 in zinc salt [Zn(NO3)2·6H2O] solution. A combination XRD and SEM-EDX techniques were used to confirm the formation of ZnO on ZnO@SiO2. Investigations indicate that the as prepared ZnO@SiO2 revealed significant antibacterial activity against Staphylococcus epidermidis bacterial strain.

scholarly journals Formates for green catalytic reductions via CO2 hydrogenation, mediated by magnetically recoverable catalysts

2018 ◽  
Vol 90 (2) ◽  
pp. 337-351 ◽  
Author(s):  
Lucio Ronchin ◽  
Claudio Tortato ◽  
Alessio Pavanetto ◽  
Mattia Miolo ◽  
Evgeny Demenev ◽  
...  
Keyword(s):  
Precious Metal ◽  
Metal Catalyst ◽  
Impregnation Method ◽  
Precious Metal Catalysts ◽  
Precipitation Procedure ◽  
Sequential Precipitation ◽  
Recoverable Catalyst ◽  
Hydrogen Carrier ◽  
Recoverable Catalysts ◽  
Magnetically Recoverable Catalyst

Abstract Precious metal catalyst has been prepared by conventional wet impregnation method followed by precipitation and reduction with hydrogen finally passivated with water in air. The magnetically recoverable catalyst has been prepared starting from a stoichiometric Fe3O4 and ZrO2–Fe3O4 as supports prepared following a sequential precipitation procedure. Precious metal catalysts supported on carbon, alumina, magnetite and zirconia-magnetite nanocomposite has been used in the reduction of nitrobenzenes and acetophenone by using sodium and potassium formate as reducing agent in the presence and in absence of an aqueous phase. In addition, the same catalysts has been tested in CO2 and NaHCO3 hydrogenation, for verifying their potentiality in the CO2 as hydrogen carrier for hydrogenation processes.

scholarly journals The utilization of micro-mesoporous carbon-based filler in the P84 hollow fibre membrane for gas separation

2021 ◽  
Vol 8 (2) ◽  
Author(s):  
Triyanda Gunawan ◽  
Nurul Widiastuti ◽  
Hamzah Fansuri ◽  
Wan Norharyati Wan Salleh ◽  
Ahmad Fauzi Ismail ◽  
...  
Keyword(s):  
Gas Separation ◽  
Mesoporous Carbon ◽  
Zeolite Y ◽  
Membrane Surface ◽  
Separation Performance ◽  
Potential Candidate ◽  
Impregnation Method ◽  
Hard Template ◽  
Polyimide Membrane ◽  
Gas Separation Performance

This research involved carrying out a unique micro-mesoporous carbon particle incorporation into P84 co-polyimide membrane for improved gas separation performance. The carbon filler was prepared using a hard template method from zeolite and known as zeolite-templated carbon (ZTC). This research aims to study the loading amount of ZTC into P84 co-polyimide toward the gas separation performance. The ZTC was prepared using simple impregnation method of sucrose into hard template of zeolite Y. The SEM result showing a dispersed ZTC particle on the membrane surface and cross-section. The pore size distribution (PSD) of ZTC revealed that the particle consists of two characteristics of micro and mesoporous region. It was noted that with only 0.5 wt% of ZTC addition, the permeability was boosted up from 4.68 to 7.06 and from 8.95 to 13.15 barrer, for CO 2 and H 2 respectively when compared with the neat membrane. On the other hand, the optimum loading was at 1 wt%, where the membrane received thermal stability boost of 10% along with the 62.4 and 35% of selectivity boost of CO 2 /CH 4 and H 2 /CH 4 , respectively. It was noted that the position of the filler on the membrane surface was significantly affecting the gas transport mechanism of the membrane. Overall, the results demonstrated that the addition of ZTC with proper filler position is a potential candidate to be applicable in the gas separation involving CO 2 and H 2 .

scholarly journals Distribusi Kandungan Logam Berat Pb dan Cd pada Sedimen Sepanjang Muara Sungai dan Laut Perairan Spermonde, Sulawesi Selatan, Indonesia

2019 ◽  
Vol 7 (1) ◽  
pp. 1-8
Author(s):  
Waode Rustiah ◽  
Alfian Noor ◽  
Maming Maming ◽  
Muhammad Lukman ◽  
Nurfadillah Nurfadillah
Keyword(s):  
General Condition ◽  
Metal Content ◽  
River Estuary ◽  
Marine Organisms ◽  
The Other ◽  
Sediment Samples ◽  
The One ◽  
Standard Range

The determination of lead (Pb) and cadmium (Cd) levels in sediment samples in Spermonde waters has been determined. Sampling was carried out in river and sea estuary waters. The method used in the analysis of Pb and Cd is the one specified by SNI 06-6992.3-2004 and SNI 06-6992.4-2004. Based on the Decree of the Minister of Environment No. 51 of 2004, the general condition of Spermonde waters still supports the activities of marine organisms. The results showed that Spermonde waters received more Pb metal input than Cd metal. Pb metal content in river estuary and sea waters averaged 17.38 ppm. The highest Pb metal content is found in Lanjukang Island and Bone Tambung Island, each ranging from 20.88 ppm and 20.19 ppm. Meanwhile, the lowest Pb metal content on Barang Lompo island was 9.86 ppm. The detected metal content of Cd is only found in the Barrang Lompo and Kondong islands of Bali, each ranging from 1.04 ppm and 0.19 ppm, while the other locations Cd metal are undetectable. Based on the SQG value, the content of Pb and Cd in sediments in Spermonde waters is still in the standard range for sediment that has not been contaminated.  

Evaluation of automated urinary iodine methods: problems of interfering substances identified

1990 ◽  
Vol 36 (6) ◽  
pp. 865-869 ◽  
Author(s):  
W May ◽  
D Wu ◽  
C Eastman ◽  
P Bourdoux ◽  
G Maberly
Keyword(s):  
Catalytic Reaction ◽  
Urinary Iodine ◽  
The Other ◽  
Acid Digestion ◽  
Dialysis Membrane ◽  
Digestion Method ◽  
Apparent Increase ◽  
Iodine Status ◽  
Endogenous Substance ◽  
Automated Methods

Abstract We evaluated automated methods for measurement of urinary iodine (UI) over a range expected in iodine-replete and iodine-deficient populations. Results obtained with Technicon AutoAnalyzer II systems, based on either dialysis or acid digestion, were compared with those obtained by a manual alkaline ashing technique. Results of automated dialysis were consistently higher than those obtained by the other methods. The apparently higher concentrations of UI we measured were due to interfering substances crossing the dialysis membrane and participating in the catalytic reaction. Thiocyanate (SCN) was one endogenous substance contributing to the increased measurement of UI. For urinary SCN concentrations of 5 to 15 mg/L, the amount of overestimation in the UI measurement attributable to SCN ranged from 21.8 to 61 micrograms/L. However, SCN may account for only 40-50% of the apparent increase in UI. In samples with lower UI (less than 50 micrograms/L), interfering substances produced a 100% error in results. We conclude that the automated dialysis system should not be used to assess iodine-deficient populations. This leaves a major dilemma for researchers wanting to assess the iodine status of populations, because the automated digestion method is no longer commercially available.

scholarly journals NiPd Supported on Mesostructured Silica Nanoparticle as Efficient Anode Electrocatalyst for Methanol Electrooxidation in Alkaline Media

Catalysts ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1235
Author(s):  
Muliani Mansor ◽  
Sharifah Najiha Timmiati ◽  
Wai Yin Wong ◽  
Azran Mohd Zainoodin ◽  
Kean Long Lim ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Surface Area ◽  
Methanol Electrooxidation ◽  
The Other ◽  
Alkaline Media ◽  
Methanol Oxidation Reaction ◽  
Impregnation Method ◽  
X Ray ◽  
Mesostructured Silica ◽  
Mass Activity

The direct methanol fuel cell (DMFC) is a portable device and has the potential to produce 10 times higher energy density than lithium-ion rechargeable batteries. It is essential to build efficient methanol electrooxidation reaction electrocatalysts for DMFCs to achieve their practical application in future energy storage and conversion. A catalyst consisting of nickel–palladium supported onto mesostructured silica nanoparticles (NiPd–MSN) was synthesized by the wet impregnation method, while MSN was synthesized using the sol-gel method. MSN act as a catalyst support and has very good characteristics for practical support due to its large surface area (>1000 m2/g) and good chemical and mechanical stability. The microstructure and catalytic activity of the electrocatalysts were analyzed by X-ray diffraction (XRD), Fourier transform infrared (FTIR), field emission scanning electron microscopy (FESEM), Brunauer–Emmet–Teller (BET) theory, X-ray photoelectron spectroscopy (XPS), cyclic voltammetry (CV), and chronoamperometry (CA). XRD showed that the NiPd–MSN electrocatalysts had a high crystallinity of PdO and NiO, while FESEM displayed that NiPd was dispersed homogeneously onto the high surface area of MSN. In alkaline media, the catalytic activity toward the methanol oxidation reaction (MOR) of NiPd–MSN demonstrated the highest, which was 657.03 mA mg−1 more than the other electrocatalysts. After 3600 s of CA analysis at −0.2 V (vs. Ag/AgCl), the MOR mass activity of NiPd–MSN in alkaline media was retained at a higher mass activity of 190.8 mA mg−1 while the other electrocatalyst was significantly lower than that. This electrocatalyst is a promising anode material toward MOR in alkaline media.

Thiolate-Initiated Synthesis of Dibenzothiophenes from 2,2′-Bis(methylthio)-1,1′-Biaryl Derivatives through Cleavage of Two Carbon–Sulfur Bonds

Synlett ◽  
2019 ◽  
Vol 30 (17) ◽  
pp. 1995-1999 ◽  
Author(s):  
Yoshihiro Masuya ◽  
Yuki Kawashima ◽  
Takuya Kodama ◽  
Naoto Chatani ◽  
Mamoru Tobisu
Keyword(s):  
Transition Metal ◽  
Dft Calculations ◽  
Catalytic Reaction ◽  
Nucleophilic Aromatic Substitution ◽  
Metal Catalyst ◽  
Aromatic Substitution ◽  
Transition Metal Catalyst ◽  
Thiolate Anion

A catalytic reaction involving the cleavage of two carbon–sulfur bonds in 2,2′-bis(methylthio)-1,1′-biaryl derivatives is reported. This reaction does not require a transition-metal catalyst and is promoted by a thiolate anion. Notably, based on DFT calculations, the product-forming cyclization step is shown to proceed through a concerted nucleophilic aromatic substitution (CSNAr) mechanism.

scholarly journals Karakterisasi Katalis Cu-Cr /Kieselguhr

REAKTOR ◽  
2017 ◽  
Vol 5 (1) ◽  
pp. 12
Author(s):  
Galuh Widiyarti
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Program Analysis ◽  
Copper Chromite ◽  
Metal Catalyst ◽  
Impregnation Method ◽  
Active Metal ◽  
Supporting Material ◽  
Catalyst Impregnation

Copper-chromite active metal catalyst was prepared by using impregnation method with kieselguhr (Al2O3SiO2) as supporting material. The content of metal active was 20% with 1:1 proportion of complex metal Cu : Cr. The specific surface area of catalyst gave specific surface area of 2,537 m2/ gram. X-ray Diffraction analysis, shown that active metal of Cu-copper Cu and cristobalite SiO2. Temperature program analysis, shown that reduction temperature of catalyst was 300 0Cusing by Scanning Electronic Microscope (SEM), the morphology of catalyst was determined.Keyword : Copper-Chromite catalyst, impregnation, Kieselguhr

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