Self-combustion Synthesis of Ni Catalysts Modified with La and Ce using Glycine–Nitrate Process (GNP)
Combustion synthesis has become an attractive method for preparing oxides and metallic materials for various applications including catalysts. One common combustion route is glycine–nitrate process (GNP). GNP involves a self-sustained reaction between metal nitrates (oxidizer) and glycine (fuel)....
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Dept. of Chemistry, UTM
2017
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| Online Access: | http://umpir.ump.edu.my/id/eprint/17088/ http://umpir.ump.edu.my/id/eprint/17088/ http://umpir.ump.edu.my/id/eprint/17088/1/25-196-1-PB.pdf |
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ump-170882017-12-15T01:01:36Z http://umpir.ump.edu.my/id/eprint/17088/ Self-combustion Synthesis of Ni Catalysts Modified with La and Ce using Glycine–Nitrate Process (GNP) Mohamad Muzakkir, Tajuddin Muhammad Hasbullah, Patulla Asmida, Ideris Mazni, Ismail TP Chemical technology Combustion synthesis has become an attractive method for preparing oxides and metallic materials for various applications including catalysts. One common combustion route is glycine–nitrate process (GNP). GNP involves a self-sustained reaction between metal nitrates (oxidizer) and glycine (fuel). The process is known to be rapid and simple, and generates catalyst powders that are high purity, crystalline and homogenous. In this work, Ni catalysts modified with La and Ce were synthesized using GNP. A precursor solution containing a stoichiometric mixture of metal nitrates was initially mixed with glycine at various glycine-nitrate ratios (G/N=0.5, 1.0, 1.5). The glycinenitrate solution was then heated to yield a gel-like liquid. The gel was further heated until it self-ignited and produced an ash powder. The catalyst ash was calcined at different temperatures (600‒800°C) and then reduced at 700°C. Catalyst characterization was performed using X-ray diffraction (XRD) and scanning electron microscopy (SEM). Once produced using GNP, the La element in Ni catalyst modified with La was presence in a form of LaNiO phase. After reduction, Ni catalyst modified with La contains only Ni and La2O3 phases. Meanwhile, Ce element in the Ni catalyst modified with Ce presence as CeO2 phase after the GNP combustion. The CeO2 phase remains after the reduction process and the reduced Ni catalyst modified with Ce composed of two separated phases; Ni and CeO2. Glycine-nitrate (G/N) ratio shows a significant effect on the morphology of the catalysts. At G/N=0.5, where the fuel composition is less than the stoichiometric ratio, the ‘cottonwool-like’ and highly porous structure were observed for both Ni catalysts modified La and Ce. At the fuel composition higher than the stoichiometric ratio (G/N= 1.5), both catalysts become dense in structure and contain less pores. Dept. of Chemistry, UTM 2017 Article PeerReviewed application/pdf en cc_by http://umpir.ump.edu.my/id/eprint/17088/1/25-196-1-PB.pdf Mohamad Muzakkir, Tajuddin and Muhammad Hasbullah, Patulla and Asmida, Ideris and Mazni, Ismail (2017) Self-combustion Synthesis of Ni Catalysts Modified with La and Ce using Glycine–Nitrate Process (GNP). Malaysian Journal of Catalysis, 2 (1). pp. 8-11. ISSN 0128-2581 http://mjcat.utm.my/index.php/MalJCat/article/view/25 |
| repository_type |
Digital Repository |
| institution_category |
Local University |
| institution |
Universiti Malaysia Pahang |
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UMP Institutional Repository |
| collection |
Online Access |
| language |
English |
| topic |
TP Chemical technology |
| spellingShingle |
TP Chemical technology Mohamad Muzakkir, Tajuddin Muhammad Hasbullah, Patulla Asmida, Ideris Mazni, Ismail Self-combustion Synthesis of Ni Catalysts Modified with La and Ce using Glycine–Nitrate Process (GNP) |
| description |
Combustion synthesis has become an attractive method for preparing oxides and metallic materials for various
applications including catalysts. One common combustion route is glycine–nitrate process (GNP). GNP involves
a self-sustained reaction between metal nitrates (oxidizer) and glycine (fuel). The process is known to be rapid and simple, and generates catalyst powders that are high purity, crystalline and homogenous. In this work, Ni catalysts modified with La and Ce were synthesized using GNP. A precursor solution containing a stoichiometric mixture of metal nitrates was initially mixed with glycine at various glycine-nitrate ratios (G/N=0.5, 1.0, 1.5). The glycinenitrate solution was then heated to yield a gel-like liquid. The gel was further heated until it self-ignited and produced an ash powder. The catalyst ash was calcined at different temperatures (600‒800°C) and then reduced at 700°C. Catalyst characterization was performed using X-ray diffraction (XRD) and scanning electron microscopy (SEM). Once produced using GNP, the La element in Ni catalyst modified with La was presence in a form of LaNiO phase. After reduction, Ni catalyst modified with La contains only Ni and La2O3 phases. Meanwhile, Ce element in the Ni catalyst modified with Ce presence as CeO2 phase after the GNP combustion. The CeO2 phase remains after the reduction process and the reduced Ni catalyst modified with Ce composed of two separated
phases; Ni and CeO2. Glycine-nitrate (G/N) ratio shows a significant effect on the morphology of the catalysts. At
G/N=0.5, where the fuel composition is less than the stoichiometric ratio, the ‘cottonwool-like’ and highly porous structure were observed for both Ni catalysts modified La and Ce. At the fuel composition higher than the stoichiometric ratio (G/N= 1.5), both catalysts become dense in structure and contain less pores. |
| format |
Article |
| author |
Mohamad Muzakkir, Tajuddin Muhammad Hasbullah, Patulla Asmida, Ideris Mazni, Ismail |
| author_facet |
Mohamad Muzakkir, Tajuddin Muhammad Hasbullah, Patulla Asmida, Ideris Mazni, Ismail |
| author_sort |
Mohamad Muzakkir, Tajuddin |
| title |
Self-combustion Synthesis of Ni Catalysts Modified with La and Ce using Glycine–Nitrate Process (GNP) |
| title_short |
Self-combustion Synthesis of Ni Catalysts Modified with La and Ce using Glycine–Nitrate Process (GNP) |
| title_full |
Self-combustion Synthesis of Ni Catalysts Modified with La and Ce using Glycine–Nitrate Process (GNP) |
| title_fullStr |
Self-combustion Synthesis of Ni Catalysts Modified with La and Ce using Glycine–Nitrate Process (GNP) |
| title_full_unstemmed |
Self-combustion Synthesis of Ni Catalysts Modified with La and Ce using Glycine–Nitrate Process (GNP) |
| title_sort |
self-combustion synthesis of ni catalysts modified with la and ce using glycine–nitrate process (gnp) |
| publisher |
Dept. of Chemistry, UTM |
| publishDate |
2017 |
| url |
http://umpir.ump.edu.my/id/eprint/17088/ http://umpir.ump.edu.my/id/eprint/17088/ http://umpir.ump.edu.my/id/eprint/17088/1/25-196-1-PB.pdf |
| first_indexed |
2023-09-18T22:23:20Z |
| last_indexed |
2023-09-18T22:23:20Z |
| _version_ |
1777415802539999232 |