Upcycling Waste Plastics into Multi-Walled Carbon Nanotube Composites via NiCo<sub>2</sub>O<sub>4</sub> Catalytic Pyrolysis
In this work, multi-walled carbon nanotube composites (MWCNCs) were produced by catalytic pyrolysis of post-consumer plastics with aluminium oxide-supported nickel, cobalt, and their bimetallic (Ni/α–Al<sub>2</sub>O<sub>3</sub>, Co/α–Al<sub>2</sub>O<sub>3<...
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2021
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oai:doaj.org-article:2d8efaef614c49a29e34014a24c652412021-11-25T17:06:14ZUpcycling Waste Plastics into Multi-Walled Carbon Nanotube Composites via NiCo<sub>2</sub>O<sub>4</sub> Catalytic Pyrolysis10.3390/catal111113532073-4344https://doaj.org/article/2d8efaef614c49a29e34014a24c652412021-11-01T00:00:00Zhttps://www.mdpi.com/2073-4344/11/11/1353https://doaj.org/toc/2073-4344In this work, multi-walled carbon nanotube composites (MWCNCs) were produced by catalytic pyrolysis of post-consumer plastics with aluminium oxide-supported nickel, cobalt, and their bimetallic (Ni/α–Al<sub>2</sub>O<sub>3</sub>, Co/α–Al<sub>2</sub>O<sub>3</sub>, and NiCo/α–Al<sub>2</sub>O<sub>3</sub>) oxide-based catalysts. The influence of catalyst composition and catalytic reaction temperature on the carbon yield and structure of CNCs were investigated. Different temperatures (800, 900, 950, and 1000 °C) and catalyst compositions (Ni, Co, and Ni/Co) were explored to maximize the yield of carbon deposited on the catalyst. The obtained results showed that at the same catalytic temperature (900 °C), a Ni/Co bimetallic catalyst exhibited higher carbon yield than the individual monometallic catalysts due to a better cracking capability on carbon-hydrogen bonds. With the increase of temperature, the carbon yield of the Ni/Co bimetallic catalyst increased first and then decreased. At a temperature of 950 °C, the Ni/Co bimetallic catalyst achieved its largest carbon yield, which can reach 255 mg g<sup>−1</sup><sub>plastic</sub>. The growth of CNCs followed a “particle-wire-tube” mechanism for all studied catalysts. This work finds the potential application of complex oxide composite material catalysts for the generation of CNCs in catalytic pyrolysis of wasted plastic.Xingmin LiuWenjie XieMarc WidenmeyerHui DingGuoxing ChenDario M. De CarolisKerstin Lakus-WollnyLeopoldo Molina-LunaRalf RiedelAnke WeidenkaffMDPI AGarticlewasted plasticcarbon nanotube compositesNi/Co catalyst“particle-wire-tube” mechanismChemical technologyTP1-1185ChemistryQD1-999ENCatalysts, Vol 11, Iss 1353, p 1353 (2021) |
| institution |
DOAJ |
| collection |
DOAJ |
| language |
EN |
| topic |
wasted plastic carbon nanotube composites Ni/Co catalyst “particle-wire-tube” mechanism Chemical technology TP1-1185 Chemistry QD1-999 |
| spellingShingle |
wasted plastic carbon nanotube composites Ni/Co catalyst “particle-wire-tube” mechanism Chemical technology TP1-1185 Chemistry QD1-999 Xingmin Liu Wenjie Xie Marc Widenmeyer Hui Ding Guoxing Chen Dario M. De Carolis Kerstin Lakus-Wollny Leopoldo Molina-Luna Ralf Riedel Anke Weidenkaff Upcycling Waste Plastics into Multi-Walled Carbon Nanotube Composites via NiCo<sub>2</sub>O<sub>4</sub> Catalytic Pyrolysis |
| description |
In this work, multi-walled carbon nanotube composites (MWCNCs) were produced by catalytic pyrolysis of post-consumer plastics with aluminium oxide-supported nickel, cobalt, and their bimetallic (Ni/α–Al<sub>2</sub>O<sub>3</sub>, Co/α–Al<sub>2</sub>O<sub>3</sub>, and NiCo/α–Al<sub>2</sub>O<sub>3</sub>) oxide-based catalysts. The influence of catalyst composition and catalytic reaction temperature on the carbon yield and structure of CNCs were investigated. Different temperatures (800, 900, 950, and 1000 °C) and catalyst compositions (Ni, Co, and Ni/Co) were explored to maximize the yield of carbon deposited on the catalyst. The obtained results showed that at the same catalytic temperature (900 °C), a Ni/Co bimetallic catalyst exhibited higher carbon yield than the individual monometallic catalysts due to a better cracking capability on carbon-hydrogen bonds. With the increase of temperature, the carbon yield of the Ni/Co bimetallic catalyst increased first and then decreased. At a temperature of 950 °C, the Ni/Co bimetallic catalyst achieved its largest carbon yield, which can reach 255 mg g<sup>−1</sup><sub>plastic</sub>. The growth of CNCs followed a “particle-wire-tube” mechanism for all studied catalysts. This work finds the potential application of complex oxide composite material catalysts for the generation of CNCs in catalytic pyrolysis of wasted plastic. |
| format |
article |
| author |
Xingmin Liu Wenjie Xie Marc Widenmeyer Hui Ding Guoxing Chen Dario M. De Carolis Kerstin Lakus-Wollny Leopoldo Molina-Luna Ralf Riedel Anke Weidenkaff |
| author_facet |
Xingmin Liu Wenjie Xie Marc Widenmeyer Hui Ding Guoxing Chen Dario M. De Carolis Kerstin Lakus-Wollny Leopoldo Molina-Luna Ralf Riedel Anke Weidenkaff |
| author_sort |
Xingmin Liu |
| title |
Upcycling Waste Plastics into Multi-Walled Carbon Nanotube Composites via NiCo<sub>2</sub>O<sub>4</sub> Catalytic Pyrolysis |
| title_short |
Upcycling Waste Plastics into Multi-Walled Carbon Nanotube Composites via NiCo<sub>2</sub>O<sub>4</sub> Catalytic Pyrolysis |
| title_full |
Upcycling Waste Plastics into Multi-Walled Carbon Nanotube Composites via NiCo<sub>2</sub>O<sub>4</sub> Catalytic Pyrolysis |
| title_fullStr |
Upcycling Waste Plastics into Multi-Walled Carbon Nanotube Composites via NiCo<sub>2</sub>O<sub>4</sub> Catalytic Pyrolysis |
| title_full_unstemmed |
Upcycling Waste Plastics into Multi-Walled Carbon Nanotube Composites via NiCo<sub>2</sub>O<sub>4</sub> Catalytic Pyrolysis |
| title_sort |
upcycling waste plastics into multi-walled carbon nanotube composites via nico<sub>2</sub>o<sub>4</sub> catalytic pyrolysis |
| publisher |
MDPI AG |
| publishDate |
2021 |
| url |
https://doaj.org/article/2d8efaef614c49a29e34014a24c65241 |
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