Surface phase structure evolution of the fcc MoC (001) surface in steam reforming atmosphere: systematic kinetic and thermodynamic investigations

2022 ◽  
Author(s):  
Changqing Chu ◽  
Chao Li ◽  
Xue Liu ◽  
Hang Zhao ◽  
Changning Wu ◽  
...  
Keyword(s):  
Steam Reforming ◽  
Phase Structure ◽  
Structure Evolution ◽  
Surface Phase

The kinetic and thermodynamic aspects of the surface phase structure evolution on a fcc MoC (001) surface under H2O/H2-rich atmosphere typical in steam reforming processes were systematically studied by periodic...

Surface phase structures responsible for activity and deactivation of fcc MoC (111)-Mo surface in steam reforming: A systematic kinetic and thermodynamic investigation

2021 ◽  
Author(s):  
Changqing Chu ◽  
Xue Liu ◽  
Changning Wu ◽  
Junguo Li ◽  
Ke Liu
Keyword(s):  
Density Functional Theory ◽  
Steam Reforming ◽  
Phase Structure ◽  
Density Functional ◽  
Structure Evolution ◽  
Surface Phase ◽  
Thermodynamic Investigation ◽  
Functional Theory ◽  
Phase Structures

The surface phase structure evolution on a fcc MoC (111)-Mo terminated surface under H2O/H2 rich environment typical in steam reforming (SR) reactions was systematically investigated by periodic density functional theory...

EFFECT OF THE PHASE STRUCTURE EVOLUTION ON THE PROPERTIES OF FILMS FORMED FROM PBA/P(ST-co-MMA) COMPOSITE LATEX

2008 ◽  
Vol 26 (01) ◽  
pp. 39 ◽  
Author(s):  
Dong-xia Huo ◽  
Xian-yong Yuan ◽  
Da-zhuang Liu ◽  
Li Zhang ◽  
Fang Wang
Keyword(s):  
Phase Structure ◽  
Structure Evolution

scholarly journals Description of the Droplet Size Evolution in Flowing Immiscible Polymer Blends

Polymers ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 761 ◽  
Author(s):  
Fortelný ◽  
Jůza
Keyword(s):  
Polymer Blends ◽  
Droplet Size ◽  
Phase Structure ◽  
Droplet Breakup ◽  
Structure Evolution ◽  
Immiscible Polymer Blends ◽  
Collision Efficiency ◽  
Immiscible Polymer ◽  
Size Evolution ◽  
Analytic Expressions

Control of the phase structure evolution in flowing immiscible polymer blends during their mixing and processing is fundamental for tailoring of their performance. This review summarizes present state of understanding and predictability of the phase structure evolution in flowing immiscible polymer blends with dispersed structure. Results of the studies of the droplet breakup in flow, important for determination of the droplet breakup frequency and of the size distribution of the daughter droplets, are reviewed. Theories of the flow-induced coalescence providing equations for collision efficiency are discussed. Approximate analytic expressions reliably describing dependence of the collision efficiency on system parameters are presented. Available theories describing the competition between the droplet breakup and coalescence in flow are summarized and approximations used in their derivation are discussed. Problems with applicability of available theories on prediction of the droplet size evolution during mixing and processing of immiscible polymer blends, which have not been broadly discussed so far, are addressed.

Phase structure evolution and magnetic properties of La/Ce doped melt-spun NdFeB alloys

2019 ◽  
Vol 490 ◽  
pp. 165454 ◽  
Author(s):  
Xiao Lin ◽  
Yang Luo ◽  
Hai-jun Peng ◽  
Yuan-fei Yang ◽  
Ya-kun Dou ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Phase Structure ◽  
Structure Evolution ◽  
Melt Spun

Instantaneous Phase Separation at the Contact Surface in Compression Molding of Immiscible Polymer Blend

2010 ◽  
Author(s):  
Wei Zhang ◽  
Min Li ◽  
Sarang Deodhar ◽  
Donggang Yao ◽  
Jack G. Zhou
Keyword(s):  
Phase Separation ◽  
Compression Ratio ◽  
Contact Surface ◽  
Phase Structure ◽  
Compression Molding ◽  
Continuous Phase ◽  
Structure Evolution ◽  
Compression Rate ◽  
Mold Surface ◽  
Immiscible Polymer

Immiscible polymer blends with a co-continuous phase structure (CPS) can yield synergistic material properties. In this study, a 50/50 wt% PLA/PS blend with CPS was used as a model system to explore the influence of compression molding conditions (including compression rate, compression ratio, and mold surface characteristics) on the final phase structure of the molded part. The microscopic characterization clearly demonstrated the instantaneous formation of a PLA rich layer at the mold contact surface when a high compression ratio and fast compression rate were applied during molding. CFD simulations were performed to numerically study the effects of compression on phase structure evolution in binary blends. If harnessed appropriately, this phase separation process may be utilized for creating innovative material structures.

An ab initio thermodynamics study of cobalt surface phases under ethanol steam reforming conditions

2014 ◽  
Vol 4 (9) ◽  
pp. 3379-3389 ◽  
Author(s):  
Wenjia Luo ◽  
Aravind Asthagiri
Keyword(s):  
Ab Initio ◽  
Surface Structure ◽  
Steam Reforming ◽  
Structure Evolution ◽  
Ethanol Steam Reforming ◽  
Surface Phases ◽  
Atomistic Thermodynamics ◽  
Ethanol Steam

A combination of DFT and ab initio atomistic thermodynamics study illustrated the surface structure evolution of Co0/Co2+ catalysts under ethanol steam reforming conditions.

The Characters of Mo-MoSi2 Functionally Graded Coating

2014 ◽  
Vol 33 (3) ◽  
pp. 239-244 ◽  
Author(s):  
Ying-Yi Zhang ◽  
Yun-Gang Li ◽  
Yuan-Hong Qi ◽  
Zong-Shu Zou
Keyword(s):  
Outer Layer ◽  
Phase Structure ◽  
Thermodynamic Calculation ◽  
Layer Structure ◽  
Functionally Graded ◽  
Surface Phase ◽  
Transitional Layer ◽  
Functionally Graded Coating ◽  
Graded Coating ◽  
Calculation Results

AbstractMo-MoSi2 functionally graded coating on Mo substrate is prepared by siliconizing technology. The characters of Mo-MoSi2 functionally graded coating are analyzed by SEM, EDS, GDS and XRD. The result shows that Mo-MoSi2 functionally graded coating is dense and smooth, without pore and crack defects, gradient coating and Mo matrix achieve good metallurgy bond. The silicon molybdenum atom ratios (Si/Mo) in functionally graded coating appear three changing regularities. When the Si/Mo of outer layer are from 6:1 to 2:1, the surface phase is constituted by MoSi2 and Si; when the Si/Mo of interlayer is about 2:1, the interlayer phase is constituted by MoSi2; when the Si/Mo of transitional layer are from 2:1 to 0:1, the transitional layer phase is constituted by Mo5Si3 and Mo. The phase structure of Mo-MoSi2 functionally graded coating from outside to inside is outer layer MoSi2 + Si, interlayer MoSi2 and transitional layer Mo5Si3 + Mo3Si three-layer structure. The thermodynamic calculation results are consistent with the experimental results substantially.

Sign in / Sign up

Export Citation Format

Share Document