Influence of Impregnation-Vacuum Filtration Conditions on Ni Dispersion and Activity of Ni-Cordierite for Hydrogenation

2013 ◽  
Vol 781-784 ◽  
pp. 312-319
Author(s):  
Shao Wen Liu ◽  
Zhuo Long Guan ◽  
Lei Qing ◽  
Jiu Ling Chen ◽  
Hai Nan Wang ◽  
...  
Keyword(s):  
Solution Concentration ◽  
Catalytic Performance ◽  
Filtration Time ◽  
Filtration Method ◽  
Vacuum Filtration ◽  
Structured Catalysts ◽  
Preparation Conditions ◽  
Vacuum Degree ◽  
Close Relationship ◽  
Impregnation Time

The influence of the preparation conditions of the impregnation-vacuum filtration method was investigated systematically on the Ni dispersion and the activity of Ni-cordierite structured catalysts in hydrogenation of m-dinitrobenzene to m-phenylenediamine. H2-TPD measurement showed that the Ni dispersion has close relationship with the impregnation solution concentration of nickel nitrate, the impregnation time, the vacuum degree, the vacuum filtration time and the calcination temperature. The hydrogenation activity test and nitrogen physisorption investigation showed that the catalytic performance of Ni-cordierite is dependent upon the Ni dispersion and the chemisorption mode of m-dinitrobenzene on Ni particles.

scholarly journals Light Olefins Production in a Fixed Bed Reactor Using Alumina Supported Iron-Cobalt-Cerium Oxide Nanocatalysts Prepared by Impregnation Procedure: Effect of Preparation Conditions on Nanocatalyst Performance

2020 ◽  
Vol 11 (4) ◽  
pp. 11592-11601
Keyword(s):  
Fixed Bed ◽  
Catalytic Performance ◽  
Fixed Bed Reactor ◽  
Light Olefins ◽  
Impregnation Method ◽  
Drying Time ◽  
Iron Cobalt ◽  
Preparation Conditions ◽  
Impregnation Time ◽  
Pretreatment Conditions

In this study, pretreatment conditions such as impregnation time and temperature and drying time and temperature for the production of the iron-cobalt-cerium catalyst with impregnation method as a first step for controlling the synthesis of a new type of three similar metal phase ratio were determined by the Taguchi method. A microtubular fixed bed reactor tested the catalysts' performance under constant conditions according to conversion. The activity and selectivity toward propylene and ethylene have been calculated. The catalyst, which impregnated at 90 °C for 4hr and dried at 120 °C for 24hr, had the best catalytic performance. According to previous studies, the catalyst calcined and the reactor test was performed in the constant and optimum condition such as calcinations in 600 °C for 6hr, reduction with H2 (flow = 30 mL.min-1) for 90 min and P~1atm and also the reaction terms was H2:CO = 1(flow H2 = 37.5 mL.min-1 and CO =37.5 mL.min-1) and p=1bar. Finally, The characterization was done by XRD, SEM, BET, and test on the precursor, optimized catalyst, and optimized catalyst after reactor tests, which all were showed the nanosized catalyst particles.

scholarly journals Copper Phyllosilicates-Derived Catalysts in the Production of Alcohols from Hydrogenation of Carboxylates, Carboxylic Acids, Carbonates, Formyls, and CO2: A Review

Catalysts ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 255
Author(s):  
Dien-Thien To ◽  
Yu-Chuan Lin
Keyword(s):  
Carboxylic Acids ◽  
Catalytic Performance ◽  
Spatial Effect ◽  
Synthesis Methods ◽  
The Past ◽  
Surface Areas ◽  
Preparation Conditions ◽  
Remedial Actions ◽  
The Stability ◽  
Size Interaction

Copper phyllosilicates-derived catalysts (CuPS-cats) have been intensively explored in the past two decades due to their promising activity in carbonyls hydrogenation. However, CuPS-cats have not been completely reviewed. This paper focuses on the aspects concerning CuPS-cats from synthesis methods, effects of preparation conditions, and dopant to catalytic applications of CuPS-cats. The applications of CuPS-cats include the hydrogenation of carboxylates, carboxylic acids, carbonates, formyls, and CO2 to their respective alcohols. Besides, important factors such as the Cu dispersion, Cu+ and Cu0 surface areas, particles size, interaction between Cu and supports and dopants, morphologies, and spatial effect on catalytic performance of CuPS-cats are discussed. The deactivation and remedial actions to improve the stability of CuPS-cats are summarized. It ends up with the challenges and prospective by using this type of catalyst.

scholarly journals Convenient fabrication of conjugated polymer semiconductor nanotubes and their application in organic electronics

2018 ◽  
Vol 5 (8) ◽  
pp. 180868
Author(s):  
Lanchao Ma ◽  
Shuixing Dai ◽  
Xiaowei Zhan ◽  
Xinyang Liu ◽  
Yu Li
Keyword(s):  
Organic Solar Cells ◽  
Field Effect Transistors ◽  
Electronic Devices ◽  
Solution Concentration ◽  
Core Shell ◽  
Organic Electronic Devices ◽  
Organic Electronic ◽  
Light Emitting ◽  
Preparation Conditions ◽  
Polymer Semiconductor

Organic heterojunction is indispensable in organic electronic devices, such as organic solar cells, organic light-emitting diodes and so on. Fabrication of core–shell nanostructure provides a feasible and novel way to prepare organic heterojunction, which is beneficial for miniaturization and integration of organic electronic devices. Fabrication of nanotubes which constitute the core–shell structure in large quantity is the key for the realization of application. In this work, a simple and convenient method to prepare nanotubes using conjugated copolymer of perylene diimide and dithienothiophene (P(PDI-DTT)) was demonstrated. The relationship between preparation conditions (solvent atmosphere, solution concentration and pore diameter of templates) and morphology of nanostructure was studied systematically. P(PDI-DTT) nanotubes could be fabricated in regular shape and large quantity by preparing the solution with appropriate concentration and placing anodic aluminium oxide template with nanopore diameter of 200 nm in the solvent atmosphere. The tubular structure was confirmed by scanning electron microscopy. P(PDI-DTT) nanotubes exhibited electron mobility of 0.02 cm 2 V –1 s –1 in field-effect transistors under ambient condition. Light-emitting nanostructures were successfully fabricated by incorporating tetraphenylethylene into polymer nanotubes.

scholarly journals Low Vacuum Filtration Method as an Alternative Extracellular Vesicle Concentration Method: Comparison with Ultracentrifugation and Differential Centrifugation

2020 ◽  
Author(s):  
Anna Drożdż ◽  
Agnieszka Kamińska ◽  
Magdalena Surman ◽  
Agnieszka Gonet-Surówka ◽  
Robert Jach ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Culture Media ◽  
Membrane Surface ◽  
Method Comparison ◽  
Environmental Scanning Electron Microscopy ◽  
Drug Carriers ◽  
Differential Centrifugation ◽  
Isolation Method ◽  
Filtration Method ◽  
Vacuum Filtration

Recent years brought great focus in the field of development of extracellular vesicles (EVs) based drug-delivery systems. Considering possible applications of EVs as a drug carriers the isolation process is a crucial step. To solve problems related with EV isolation, we created and validated a new EVs isolation method – Low Vacuum Filtration (LVF) and compared it with two commonly applied procedures - differential centrifugation (DC) and ultracentrifugation (UC). EVs isolated from endothelial cells culture media have been characterized by a) transmission electron microscopy (TEM) b) nanoparticle tracking analysis (NTA), c) western blot and d) Fourier-Transform Infrared Spectroscopy (FTIR). Additionally, the membrane surface have been imaged with Environmental Scanning Electron Microscopy (ESEM). We showed that LVF is reproducible and efficient method for EVs isolation form conditioned media. Additionally, we observed correlation between ATR-FTIR spectra quality and the EVs and proteins concentration. ESEM imaging confirmed that actual pore diameter are close to the values calculated theoretically. LVF method is an easy, fast and inexpensive EVs isolation method which allows for isolation of both ectosomes and exosomes from high volume sources with good repeatability. We think that it could be an efficient alternative for commonly applied methods.

scholarly journals Μέθοδος εμπλουτισμού σπέρματος κριού σε ζωηρά κινούμενα σπερματοζωάρια

2018 ◽  
Vol 61 (2) ◽  
pp. 120
Author(s):  
S. G. PIPERELIS (Σ.Γ. ΠΙΠΕΡΕΛΗΣ) ◽  
D. Vafiadis (Δ. ΒΑΦΕΙΑΔΗΣ) ◽  
C. Alexopoulos (Κ. ΑΛΕΞΟΠΟΥΛΟΣ)
Keyword(s):  
Glass Beads ◽  
Initial Value ◽  
Filtration Time ◽  
Filtration Method ◽  
Significant Difference ◽  
Further Development ◽  
Time Density ◽  
Production Facilities

Semen availability in ram semen production facilities is of great importance and a method that would increase viability in low viability ejaculates could be useful. In this study the possibility of a glass beads filtration method estimating the beads total surface provided (TSP) for adhesion of spermatozoa is evaluated. Initially, two different TSP (102cm2,154cm2) achieved by various sizes of beads were tested and no significant difference in viability improvement appeared for the same TSP by different beads (p<0.05). An optimization test followed in which three different funnels were evaluated using standard TSP (154cm2). The only parameter improved was filtrate volume, while filtration time, density and viability improvement remained the same (p<0.05).Finally, different TSP were evaluated and significant differences in viability improvement (p<0.01) and filtrate volume (p<0.05)for 102cm2 appeared. Increase in initial value 25% for viability and ejaculate recovery 65% all in time less than 6 minutes stronglysuggest that through further development this method can be used in ram semen production facilities.

scholarly journals Fabrication of Silver Nanowire/Polydimethylsiloxane Dry Electrodes by a Vacuum Filtration Method for Electrophysiological Signal Monitoring

ACS Omega ◽  
2020 ◽  
Vol 5 (18) ◽  
pp. 10260-10265 ◽  
Author(s):  
Ravinder Reddy Kisannagar ◽  
Pallavi Jha ◽  
Ambuja Navalkar ◽  
Samir K. Maji ◽  
Dipti Gupta
Keyword(s):  
Silver Nanowire ◽  
Filtration Method ◽  
Vacuum Filtration ◽  
Dry Electrodes ◽  
Signal Monitoring ◽  
Electrophysiological Signal

Transfer Method of Carbon Nanotube Film for Embedded Transparent Electrode

2009 ◽  
Author(s):  
Kangwon Lee ◽  
Jung A. Lee ◽  
Kwang-Cheol Lee ◽  
Seung S. Lee
Keyword(s):  
Carbon Nanotube ◽  
Transparent Electrode ◽  
Filtration Method ◽  
Vacuum Filtration ◽  
Transfer Method ◽  
Photolithography Process ◽  
Polymer Mems ◽  
Peeling Off ◽  
Poor Adhesion ◽  
Si Wafer

We describe new transfer method of carbon nanotube (CNT) film onto the poly-dimethysiloxane (PDMS) based on the poor adhesion between Si wafer and Au layer. To combine the CNT film with the polymer-MEMS field, it is required to transfer CNT film onto the polymer substrates. CNT film was fabricated by vacuum filtration method and was transferred onto the Au-deposited Si wafer. Using photolithography process, CNT film was patterned and PDMS is pouring and curing on the wafer. After peeling off the PDMS, patterned CNT film was transferred which was embedded into the PDMS. The possibility of embedded CNT film in the micro system was demonstrated in the application of electro-thermal actuator.

Flexible Bi–Te-based alloy nanosheet/PEDOT:PSS thermoelectric power generators

2019 ◽  
Vol 3 (7) ◽  
pp. 1328-1334 ◽  
Author(s):  
Yong Du ◽  
Xin Liu ◽  
Jiayue Xu ◽  
Shirley Z. Shen
Keyword(s):  
Thermoelectric Power ◽  
Nanocomposite Films ◽  
Filtration Method ◽  
Vacuum Filtration ◽  
Power Generators ◽  
Alloy Particles

Herein, Bi–Te-based alloy nanosheet/poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS) thermoelectric nanocomposite films were prepared by a vacuum filtration method after exfoliating Bi–Te-based alloy particles into nanosheets.

scholarly journals The Preparation and Study of Ethylene Glycol-Modified Graphene Oxide Membranes for Water Purification

Polymers ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 188 ◽  
Author(s):  
Yang Zhang ◽  
Lin-Jun Huang ◽  
Jian-Guo Tang ◽  
Yao Wang ◽  
Meng-Meng Cheng ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Graphene Oxide ◽  
Water Purification ◽  
Interlayer Spacing ◽  
Filtration Method ◽  
Vacuum Filtration ◽  
X Ray ◽  
Molecular Separation ◽  
Scanning Electron

In this work, graphene oxide (GO)/ethylene glycol (EG) membranes were designed by a vacuum filtration method for molecular separation and water purification. The composite membranes were characterized by scanning electron microscopy (SEM), field emission scanning electron microscopy (FESEM), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS). The interlayer spacing of GO membranes (0.825 nm) and GO/EG membranes (0.634 nm) are measured by X-ray diffraction (XRD). Using the vacuum filtration method, the membrane thickness can be controlled by selecting the volume of the solution from which the membrane is prepared, to achieve high water permeance and high rejection of Rhodamine B (RhB). The membrane performance was evaluated on a dead-end filtration device. The water permeance and rejection of RhB of the membranes are 103.35 L m−2 h−1 bar−1 and 94.56% (GO), 58.17 L m−2 h−1 bar−1 and 97.13% (GO/EG), respectively. The permeability of GO/EG membrane is about 40 × 10−6 L m-1 h−1 bar−1. Compared with the GO membrane, the GO/EG membrane has better separation performance because of its proper interlayer spacing. In this study, the highest rejection of RhB (99.92%) is achieved. The GO/EG membranes have potential applications in the fields of molecular separation and water purification.

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