Preparation of NiO catalyst on FeCrAI substrate using various techniques at higher oxidation process
The cheap nickel oxide (NiO) is a potential catalyst candidate to replace the expensive available platinum group metals (PGM). However, the current methods to adhere the NiO powder on the metallic substrates are complicated. Therefore, this work explored the development of nickel oxide using ni...
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| Format: | Thesis |
| Language: | English English English |
| Published: |
2011
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/2941/1/24p%20YANUANDRI%20PUTRASARI.pdf http://eprints.uthm.edu.my/2941/2/YANUANDRI%20PUTRASARI%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/2941/3/YANUANDRI%20PUTRASARI%20WATERMARK.pdf |
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| Summary: | The cheap nickel oxide (NiO) is a potential catalyst candidate to replace the
expensive available platinum group metals (PGM). However, the current methods to
adhere the NiO powder on the metallic substrates are complicated. Therefore, this
work explored the development of nickel oxide using nickel (Ni) on FeCrAl
substrate through the combination of nickel electroplating and oxidation process for
catalytic converter application. The approach was started with assessment of various
nickel electroplating process based on the weight gain during oxidation. Then, the
next experiment used the best process in which the pre-treatment using the solution
of SiC and/or Al2O3 in methanol. The specimens then were carried out to short term
oxidation process using thermo gravimetric analysis (TGA) at 1000
o
C. Meanwhile,
the long term oxidation process was conducted using an automatic furnace at 900,
1000 and 1100
o
C. The atomic force microscopy (AFM) was used for surface
analysis in nanometer range scale. Meanwhile, roughness test was used for roughness
measurement analysis in micrometer range scale. The scanning electron microscope
(SEM) attached with energy dispersive X-ray (EDX) were used for surface and cross
section morphology analysis. The specimen of FeCrAl treated using ultrasonic prior
to nickel electroplating showed the lowest weight gain during oxidation. The surface
area of specimens increased after ultrasonic treatment. The electroplating process
improved the high temperature oxidation resistance. In short term oxidation process
indicated that the ultrasonic with SiC provided the lower parabolic rate constant (kp)
and the Al2O3 and NiO layers were also occurred. The Ni layer was totally
disappeared and converted to NiO layer on FeCrAl surface after long term oxidation
process. From this work, the ultrasonic treatment prior to nickel electroplating was
the best method to adhere NiO on FeCrAl substrate. |
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