scholarly journals Nickel Silicide Catalyst from Photovoltaic Waste for the Methanation Reaction

Minerals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1412
Author(s):  
Jakub Bumba ◽  
Vladislav Drinek ◽  
Pavel Krystynik ◽  
Pavel Dytrych ◽  
Olga Solcova
Keyword(s):  
Chemical Vapor Deposition ◽  
Phosphoric Acid ◽  
Vapor Deposition ◽  
Tubular Reactor ◽  
Chemical Vapor ◽  
Nickel Silicide ◽  
Magnesium Silicide ◽  
Total Conversion ◽  
Silicon Hydrides ◽  
Optimized Conditions

A technology designed for recycling photovoltaic (PV) cells at the end of their life was successfully used for the preparation of a nickel silicide catalyst. PV cells were mixed with magnesium scrap to produce magnesium silicide (Mg2Si), with almost total conversion under optimized conditions (400 °C, 5 Pa, 25 min), in a constructed semi-open tubular reactor. Subsequently, magnesium silicide was hydrolyzed by 25% phosphoric acid to produce a mixture of silicon hydrides, which were utilized as chemical vapor deposition (CVD) precursors for the preparation of a nickel silicide catalyst. The activity and stability of the prepared catalyst was repeatedly tested for methanation reactions. It was verified that the nickel silicide catalyst showed an approximately 20% higher activity for the methanation reactions compared to the commonly used nickel catalyst.

Effect of Compressive Residual Stress on Film Formed by Mechanochemical Multifunction Cavitation Processing

2021 ◽  
Vol 1016 ◽  
pp. 574-579
Author(s):  
Masataka Ijiri ◽  
Fumihiro Kato ◽  
Daisaku Maeda ◽  
Daichi Shimonishi ◽  
Toshihiko Yoshimura
Keyword(s):  
Residual Stress ◽  
Corrosion Resistance ◽  
Chemical Vapor Deposition ◽  
Fatigue Strength ◽  
Phosphoric Acid ◽  
Vapor Deposition ◽  
Compressive Residual Stress ◽  
Chemical Vapor ◽  
Al Alloys ◽  
Magnesium Surface

Recently, mechanochemical multifunction cavitation (MC-MFC) was developed to improve the corrosion resistance of the magnesium surface. MFC is a technology that combines water jet peening and ultrasound cavitation. MC-MFC is a technology that adds phosphoric acid to water. It can improve the corrosion resistance by forming a phosphate film on the Mg surface. Conventional anodic oxidation, plating, and chemical vapor deposition can improve corrosion resistance by forming a film on the Mg surface, but it is difficult to improve characteristics such as compressive residual stress on the surface. MFC-treated surfaces have previously imparted various properties such as imparting compressive residual stress necessary to improve the fatigue strength to Al alloys and Cr-Mo steels. In this study, the effect of film formed on MC-MFC processed surface on compressive residual stress was investigated.

Chemical Vapor Deposition of TBC: An Alternative Process for Gas Turbine Components

2000 ◽  
Vol 123 (3) ◽  
pp. 520-524 ◽  
Author(s):  
G. Wahl ◽  
W. Nemetz ◽  
M. Giannozzi ◽  
S. Rushworth ◽  
D. Baxter ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Point Of View ◽  
Process Yield ◽  
Deposition Parameters ◽  
New Process ◽  
Metal Organic ◽  
Optimized Conditions

This paper deals with the development of a new process for the deposition of thermal barrier coatings (TBC) based on chemical vapor deposition (CVD). The research program started in September 1998 under a BRITE/Euram III project. The CVD process involves the evaporation of zirconium and yttrium starting from metal-organic precursors and their reaction with oxygen in a hot wall reactor in order to deposit TBC layers. The influence of different deposition parameters such as evaporation temperature, pressure, and substrate temperature on structure, deposition rate, and process yield are described. The characterization of different precursors behavior is also described. Preliminary results, obtained with optimized conditions, have shown ZrO2-Y2O3 columnar layers with deposition rates of interest from an industrial point of view.

Growth of single-crystalline nickel silicide nanowires with excellent physical properties

CrystEngComm ◽  
2015 ◽  
Vol 17 (9) ◽  
pp. 1911-1916 ◽  
Author(s):  
Jen-Yi Lin ◽  
Hsiu-Ming Hsu ◽  
Kuo-Chang Lu
Keyword(s):  
Chemical Vapor Deposition ◽  
Physical Properties ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Nickel Silicide ◽  
Chemical Vapor Deposition Method ◽  
Deposition Method ◽  
Single Crystalline

Single-crystalline NiSi2, Ni2Si and Ni31Si12 nanowires with outstanding characteristics were synthesized through a nickel transport chemical vapor deposition method.

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