scholarly journals Si-doped Al2o3 Nanosheet Supported Pd for Catalytic Combustion of Propane: Effects of Si Doping on Morphology, Thermal Stability and Water-resistance

2021 ◽  
Author(s):  
Mingxiang Jiang ◽  
Qingqing Wu ◽  
Jiaorong Yan ◽  
Jun Pan ◽  
Qiguang Dai ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Catalytic Combustion ◽  
Water Resistance ◽  
Hydrocarbon Emissions ◽  
Pd Catalysts ◽  
Si Doping ◽  
Si Doped ◽  
Si Content ◽  
Thermal Stability Of ◽  
Supported Pd

Abstract Catalytic combustion of propane as typical light alkanes was important for the purification of industrial VOCs and automobile hydrocarbon emissions. Si-doped Al2O3 nanosheet was synthesized by a hydrothermal method, and effects of Si content on the morphology and thermal stability of Al2O3 were investigated. The doping of SiO2 could tune the thickness of Al2O3 nanosheets and significantly improve its thermal stability, the θ phase was still maintained and the specific surface area was as high as 56.3 m2∙g-1 after calcination at 1200 ℃. And then the Si-doped Al2O3 nanosheets were used as support of Pd catalysts (Pd/Si-Al2O3 nanosheets) for catalytic combustion of propane, especially Pd/3.6Si-Al2O3 nanosheets, which presented high activity, stability and resistance to sintering and H2O due to the promotion of Si on the thermal stability of Al2O3 and the stabilization (dispersion, isolation and strong interaction) of PdOx species.

Thermal stability of Si-doped V2O5/WO3–TiO2 for selective catalytic reduction of NOx by NH3

Rare Metals ◽  
2018 ◽  
Vol 38 (4) ◽  
pp. 292-298 ◽  
Author(s):  
Xun-Zhe Shao ◽  
Hong-You Wang ◽  
Meng-Long Yuan ◽  
Jie Yang ◽  
Wang-Cheng Zhan ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Si Doped ◽  
Reduction Of Nox ◽  
Thermal Stability Of

Study on Acrylic Emulsion Adhesive Modified by Double Siloxane

2013 ◽  
Vol 395-396 ◽  
pp. 367-370
Author(s):  
Cai Hua Gao ◽  
Wen Lu Guo ◽  
Zhi Ming Jin
Keyword(s):  
Thermal Stability ◽  
Comparative Study ◽  
Heat Resistance ◽  
Chemical Process ◽  
Water Resistance ◽  
Orthogonal Experiment ◽  
Acrylic Emulsion ◽  
Macroscopic Properties ◽  
The Stability ◽  
Thermal Stability Of

The acrylic emulsion adhesive was modified by D4 and KH570 with chemical process, and we can get the modified product successfully via the best technology parameter which was confirmed by orthogonal experiment. The structure of acrylic was characterized by FTIR, while there was a comparative study on the macroscopic properties and thermal stability of the unmodified and modified product. The results showed that when m(D4):m(KH570) was 2:1, the dosage of emulsifier was 3.0%, the dosage of KPS was 4.0%, the monomer(soft and hard) ratio was 1:1, the stability of the acrylic emulsion adhesive modified by double siloxane was good, and its viscosity, water resistance, heat resistance were improved greatly.

Preparation and Properties of Silane-Terminated Poly(urethane-Imide)

2013 ◽  
Vol 690-693 ◽  
pp. 1577-1580
Author(s):  
Xiao Xi Hu ◽  
Yun Wang
Keyword(s):  
Thermal Stability ◽  
Water Resistance ◽  
Tensile Tests ◽  
Mechanical Analysis ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Silane Coupling ◽  
Ft Ir ◽  
And Storage ◽  
Thermal Stability Of

A serious of silane-terminated poly (urethane-imide) (Si-PUI) was synthesized via prepolymer method using polycarbonatediols (PCDL), 2,4-tolylene diisocyanate (TDI), 4,4'-Oxydiphthalic Anhydride (ODPA) and silane coupling agent KH-550. The structure of the products was characterized by FT-IR. The thermal properties were measured by thermal gravimetric analysis (TGA). The thermal mechanical behavior was investigated by dynamic mechanical analysis (DMA).The mechanical characteristic was measured by tensile tests. The water absorption (Wa) was also been tested. With the imide content increasing, the thermal stability, tensile strength and storage modulus of poly (urethane-imide) improve significantly, and the glass transition temperature rises. The introduction of silanes improves the water resistance and further enhances the thermal stability of poly (urethane-imide).

The properties of sericin/poly(vinyl alcohol) films modified by boric acid

e-Polymers ◽  
2010 ◽  
Vol 10 (1) ◽  
Author(s):  
Qun Wang ◽  
Lu Qi
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Boric Acid ◽  
Vinyl Alcohol ◽  
Water Resistance ◽  
Poly Vinyl Alcohol ◽  
Scanning Calorimetry ◽  
Blend Ratio ◽  
Percutaneous Drug Delivery ◽  
Thermal Stability Of

AbstractA group of films mainly composed of sericin and poly(vinyl alcohol) (PVA), using boric acid (BA) as a modifier, were prepared by a technique of solution casting. In this work, the effect of BA and sericin on the mechanical properties and water resistance of the films was analyzed, the interior morphology of the films were described by a scanning electron microscopy (SEM), the thermal stability of the films was characterized by differential scanning calorimetry (DSC), and the reaction mechanism was proposed according to the previous literature and the test of Fourier transform infrared spectrum (FTIR). Results indicated that, the properties of the membrane were the functions of the blend ratio of sercin to PVA and the content of BA. The use of BA increased the tensile strength, improved the water resistance and the thermal stability, and varied the interior morphology of the films. The content of sericin greatly influenced the combination of properties of the films, especially the mechanical properties, interior morphology, thermal stability, and water resistance reducing with the increasing of sericin content. The films have potential to be used in materials, such as skin-care coatings for beauty, percutaneous drug delivery systems for exterior intact skin, due to the characteristics of the components and the good mechanical properties of the films.

Diamondlike Carbon Materials as Low-k Dielectrics for Multilevel Interconnects in Ulsi

1996 ◽  
Vol 443 ◽  
Author(s):  
A. Grill ◽  
V. Patel ◽  
K.L. Saenger ◽  
C. Jahnes ◽  
S.A. Cohen ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Dielectric Constant ◽  
Dielectric Constants ◽  
Internal Stresses ◽  
Diamondlike Carbon ◽  
Potential Applications ◽  
Etch Stop ◽  
Si Content ◽  
Low K ◽  
Thermal Stability Of

AbstractA variety of diamondlike carbon (DLC) materials were investigated for their potential applications as low-k dielectrics for the back end of the line (BEOL) interconnect structures in ULSI circuits. Hydrogenated DLC and fluorine containing DLC (FDLC) were studied as a low-k interlevel and intralevel dielectrics (ILD), while silicon containing DLC (SiDLC) was studied as a potential low-k etch stop material between adjacent DLC based ILD layers, which can be patterned by oxygen-based plasma etchingIt was found that the dielectric constant (k) of the DLC films can be varied between >3.3 and 2.7 by changing the deposition conditions. The thermal stability of these DLC films was found to be correlated to the values of the dielectric constant, decreasing with decreasing k. While DLC films having dielectric constants k>3.3 appeared to be stable to anneals of 4 hours at 400 °C in He, a film having a dielectric constant of 2.7 was not, losing more than half of its thickness upon exposure to the same anneal. The stresses in the DLC films were found to decrease with decreasing dielectric constant, from 700 MPa to about 250 MPa. FDLC films characterized by a dielectric constant of about 2.8 were found to have similar thermal stability as DLC films with k >3.3. The thermally stable FDLC films have internal stresses <300 MPa and are thus promising candidates as a low-k ILD.For the range of Si contents examined (0-9% C replacement by Si), SiDLC films with a Si content of around 5% appear to provide an effective etch-stop for oxygen RIE of DLC or FDLC films, while retaining desirable electrical characteristics. These films showed a steady state DLC/SiDLC etch rate ratio of about 17, and a dielectric constant only about 30% higher than the 3.3 of DLC.

Thermal stability of Cr1−xAlxSiyN coatings with medium and high aluminium content prepared by arc evaporation

2005 ◽  
Vol 890 ◽  
Author(s):  
Pavla Karvankova ◽  
Ayat Karimi ◽  
Olivier Coddet ◽  
Tibor Cselle ◽  
Marcus Morstein
Keyword(s):  
Thermal Stability ◽  
Aluminium Content ◽  
Two Phase ◽  
Al Content ◽  
Annealing Step ◽  
Industrial Unit ◽  
Cathodic Arc Evaporation ◽  
Si Content ◽  
Arc Evaporation ◽  
Thermal Stability Of

ABSTRACTThe thermal stability of Cr1−xAlxN and Cr1−xAlxSiyN nanocomposite coatings with different composition x, Si content, and phase structure has been investigated. The coatings were deposited in an industrial unit by the cathodic arc evaporation method, using rotating cylindrical cathodes. Further sets of coated WC/Co plates were subjected to an annealing step in a forming gas (92% N2 / 8% H2) atmosphere for several hours at a constant temperature (maximum 1000°C). Chemical composition, microstructure and mechanical properties of the coatings were investigated by the RBS, XRD, TEM, SEM, XPS and nanoindentation techniques.As-deposited Cr1−xAlxSiyN coatings with Al contents x in the range of 0.4 ≤ x ≤ 0.6 showed a single-phase cubic CrAlN structure and a maximum hardness of 38 GPa. With increasing the Al content to x = 0.95 – 0.96, two-phase films consisting of hexagonal AlN and cubic CrAlN structure with hardness of about 31 GPa were obtained. The hardness of Cr1−xAlxSiyN coatings increases during annealing at temperatures in the range of 800 – 1000°C by about 1 – 4 GPa, even though the residual compressive stress in the coatings was found to relax considerably during this procedure. The addition of Si into Cr1−xAlxN delays the appearance of hcp-AlN and thereby improves the thermal stability of the coatings.

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