Cu supported on thin carbon layer-coated porous SiO2 for efficient ethanol dehydrogenation

2018 ◽  
Vol 8 (2) ◽  
pp. 472-479 ◽  
Author(s):  
Qing-Nan Wang ◽  
Lei Shi ◽  
Wei Li ◽  
Wen-Cui Li ◽  
Rui Si ◽  
...  
Keyword(s):  
Carbon Layer ◽  
Good Stability ◽  
Ethanol Dehydrogenation ◽  
Porous Sio2 ◽  
Thin Carbon

The designed Cu/C/SiO2 catalyst combines the favourable properties of carbon and silica, thus showing improved selectivity associated with good stability.

Problems with oxygen analysis in the system MgO-Al2O3-SiO2 with the electron microprobe

1992 ◽  
Vol 50 (2) ◽  
pp. 1624-1625
Author(s):  
Michel Fialin ◽  
Guy Rémond
Keyword(s):  
Transition Metal ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Electrostatic Charge ◽  
Carbon Layer ◽  
Sample Holder ◽  
Rock Matrix ◽  
Electrical Discharges ◽  
Thin Carbon ◽  
Beam Instabilities

Oxygen-bearing minerals are generally strong insulators (e.g. silicates), or if not (e.g. transition metal oxides), they are included within a rock matrix which electrically isolates them from the sample holder contacts. In this respect, a thin carbon layer (150 Å in our laboratory) is evaporated on the sections in order to restore the conductivity. For silicates, overestimated oxygen concentrations are usually noted when transition metal oxides are used as standards. These trends corroborate the results of Bastin and Heijligers on MgO, Al2O3 and SiO2. According to our experiments, these errors are independent of the accelerating voltage used (fig.l).Owing to the low density of preexisting defects within the Al2O3 single-crystal, no significant charge buildup occurs under irradiation at low accelerating voltage (< 10keV). As a consequence, neither beam instabilities, due to electrical discharges within the excited volume, nor losses of energy for beam electrons before striking the sample, due to the presence of the electrostatic charge-induced potential, are noted : measurements from both coated and uncoated samples give comparable results which demonstrates that the carbon coating is not the cause of the observed errors.

scholarly journals Resistive-pulse and rectification sensing with glass and carbon nanopipettes

2017 ◽  
Vol 473 (2199) ◽  
pp. 20160931 ◽  
Author(s):  
Yixian Wang ◽  
Dengchao Wang ◽  
Michael V. Mirkin
Keyword(s):  
Solid State ◽  
Carbon Layer ◽  
Fine Tuning ◽  
Physical Size ◽  
Resistive Pulse ◽  
Thin Carbon ◽  
Local Measurements ◽  
Electroactive Species ◽  
Current Rectification ◽  
Resistive Pulse Sensing

Along with more prevalent solid-state nanopores, glass or quartz nanopipettes have found applications in resistive-pulse and rectification sensing. Their advantages include the ease of fabrication, small physical size and needle-like geometry, rendering them useful for local measurements in small spaces and delivery of nanoparticles/biomolecules. Carbon nanopipettes fabricated by depositing a thin carbon layer on the inner wall of a quartz pipette provide additional means for detecting electroactive species and fine-tuning the current rectification properties. In this paper, we discuss the fundamentals of resistive-pulse sensing with nanopipettes and our recent studies of current rectification in carbon pipettes.

Erosion of thin carbon layer on metal surface by hydrogen ion bombardment at elevated temperatures

1985 ◽  
Vol 135 (2-3) ◽  
pp. 260-264 ◽  
Author(s):  
Hirotaka Ohno ◽  
Kenji Morita ◽  
Yuji Horino ◽  
Noriaki Itoh
Keyword(s):  
Metal Surface ◽  
Elevated Temperatures ◽  
Ion Bombardment ◽  
Carbon Layer ◽  
Hydrogen Ion ◽  
Thin Carbon

Constructing BaLi2Ti6O14@C nanofibers with a low carbon content as high-performance anode materials for Li-ion batteries

2020 ◽  
Vol 44 (11) ◽  
pp. 4295-4303
Author(s):  
Chao Wang ◽  
Xing Li ◽  
Yuzhou Liu ◽  
Nan Gao ◽  
Xing Xin
Keyword(s):  
Carbon Content ◽  
Anode Materials ◽  
High Performance ◽  
Carbon Layer ◽  
Electrospinning Process ◽  
Annealing Process ◽  
Li Ion Batteries ◽  
Low Carbon ◽  
Thin Carbon ◽  
Li Ion

In this work, BaLi2Ti6O14 nanofibers coated by a thin carbon layer were rationally designed and synthesized by a controlled electrospinning process and a simple annealing process.

Thin carbon layer coated Ti3+-TiO2nanocrystallites for visible-light driven photocatalysis

Nanoscale ◽  
2015 ◽  
Vol 7 (11) ◽  
pp. 5035-5045 ◽  
Author(s):  
Baojiang Jiang ◽  
Yunqi Tang ◽  
Yang Qu ◽  
Jian-Qiang Wang ◽  
Ying Xie ◽  
...  
Keyword(s):  
Visible Light ◽  
Carbon Layer ◽  
Thin Carbon ◽  
Visible Light Driven

scholarly journals Ordered Porous TiO2@C Layer as an Electrocatalyst Support for Improved Stability in PEMFCs

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3462
Author(s):  
Gaoyang Liu ◽  
Zhaoyi Yang ◽  
Xindong Wang ◽  
Baizeng Fang
Keyword(s):  
Active Sites ◽  
Structural Characteristics ◽  
Clean Energy ◽  
Carbon Layer ◽  
Proton Exchange ◽  
Membrane Electrode ◽  
Durability Test ◽  
Thin Carbon ◽  
Array Structure ◽  
Ordered Porous

Proton exchange membrane fuel cells (PEMFCs) are the most promising clean energy source in the 21st century. In order to achieve a high power density, electrocatalytic performance, and electrochemical stability, an ordered array structure membrane electrode is highly desired. In this paper, a new porous Pt-TiO2@C ordered integrated electrode was prepared and applied to the cathode of a PEMFC. The utilization of the TiO2@C support can significantly decrease the loss of catalyst caused by the oxidation of the carbon from the conventional carbon layer due to the strong interaction of TiO2 and C. Furthermore, the thin carbon layer coated on TiO2 provides the rich active sites for the Pt growth, and the ordered support and catalyst structure reduces the mass transport resistance and improves the stability of the electrode. Due to its unique structural characteristics, the ordered porous Pt-TiO2@C array structure shows an excellent catalytic activity and improved Pt utilization. In addition, the as-developed porous ordered structure exhibits superior stability after 3000 cycles of accelerated durability test, which reveals an electrochemical surface area decay of less than 30%, considerably lower than that (i.e., 80%) observed for the commercial Pt/C.

scholarly journals Carbon Molecular Sieve Membranes from Polyetherimide: Effect of Pyrolysis Temperature on O2/N2 Selectivity

2017 ◽  
Vol 14 (1) ◽  
Author(s):  
M. A. Ahmad ◽  
N. K. A. Rashid ◽  
B. H. Hameed
Keyword(s):  
Molecular Sieve ◽  
Pyrolysis Temperature ◽  
Gas Permeability ◽  
High Surface ◽  
High Surface Area ◽  
Carbon Layer ◽  
Separation Performance ◽  
Carbon Molecular Sieve ◽  
Carbon Structures ◽  
Thin Carbon

Carbon molecular sieve (CMS) membranes with excellent separation performance and stability appear to be promising candidate for gas separation. In this work, CMS membranes were formed by a thin carbon layer obtained by pyrolysis of a coated polyetherimide solution onto porous disk support. The pyrolysis temperatures were varied under inert condition. Results showed that the pyrolysis temperature played an important role in determining the gas permeability of CMS membranes. The CMS membrane prepared at pyrolysis temperature of 700°C shows high surface area and narrow PSD with well developed microporous carbon structures. The development of large pore occurs at higher pyrolysis temperature. The O2/N2 permselectivities of 2.86, 2.61 and 2.22, respectively were attained by CMS membranes prepared at pyrolyzed temperature of 700, 800 and 900°C.

scholarly journals Growth and Functionalization of Particle-Based Mesoporous Silica Films and Their Usage in Catalysis

Nanomaterials ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 562 ◽  
Author(s):  
Pei-Hsuan Wu ◽  
Peter Mäkie ◽  
Magnus Odén ◽  
Emma Björk
Keyword(s):  
Acetic Acid ◽  
Film Growth ◽  
Formation Rate ◽  
Carbon Layer ◽  
Esterification Reaction ◽  
Efficient Catalyst ◽  
Thin Carbon ◽  
Chemical Variability ◽  
Coated Film ◽  
Carbon Coated

We report the formation of mesoporous films consisting of SBA-15 particles grown directly onto substrates and their usage as catalysts in esterification of acetic acid and ethanol. The film thickness was altered between 80 nm and 750 nm by adding NH4F to the synthesis solution. The salt also affects the formation rate of the particles, and substrates must be added during the formation of the siliceous network in the solution. Various substrate functionalizations were tested and hydrophobic substrates are required for a successful film growth. We show that large surfaces (> 75 cm2), as well as 3D substrates, can be homogenously coated. Further, the films were functionalized, either with acetic acid through co-condensation, or by coating the films with a thin carbon layer through exposure to furfuryl alcohol fumes followed by carbonization and sulfonation with H2SO4. The carbon-coated film was shown to be an efficient catalyst in the esterification reaction with acetic acid and ethanol. Due to the short, accessible mesopores, chemical variability, and possibility to homogenously cover large, rough surfaces. the films have a large potential for usage in various applications such as catalysis, sensing, and drug delivery.

Sign in / Sign up

Export Citation Format

Share Document