The use of different metal catalysts for the simultaneous production of carbon nanotubes and hydrogen from pyrolysis of plastic feedstocks

By J. C. Acomb, Chunfei Wu, Paul T. Williams. 2016

286 citations recorded by the source corpus.

Nickel, iron, cobalt and copper catalysts were prepared by impregnation and used to produce carbon nanotubes and hydrogen gas from a LDPE feedstock. A two stage catalytic pyrolysis process was used to enable large yields of both products. Plastics samples were pyrolysed in nitrogen at 600 °C, before the evolved gases were passed to a second stage and allowed to deposit carbon onto the catalyst at a temperature of 800 °C. Carbon nanotubes were successfully generated on nickel, iron and cobalt but were barely observed on the copper catalyst. Iron and nickel catalysts gave the largest yield of both hydrogen and carbon nanotubes as a result of metal-support interactions which were neither too strong, like cobalts, nor too weak like copper. These metal support interactions proved a key factor in CNT production. A nickel catalyst with a weaker interaction was prepared using a lower calcination temperature. Yields of both carbon nanotubes and hydrogen gas were lower on the Ni-catalyst prepared at the lower calcination temperature, as a result of sintering of the nickel particles. In addition, the catalyst prepared at a lower calcination temperature produced metal particles which were too large for CNT growth, producing amorphous carbons which deactivate the catalyst instead. Overall the iron catalyst gave the largest yield of CNTs, which is attributed to both its good metal-support interactions and irons large carbon solubility.

Subfields: Materials Chemistry, Polymers and Plastics

View Paper: https://www.semanticscholar.org/paper/c68de1ce918afcd0062cadb887483e26c741c615

How researchers see this paper

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In Materials Chemistry

1. Dingding Yao
2. Haiping Yang
3. Hanping Chen
4. Paul T. Williams
5. Chunfei Wu
6. Yingquan Chen
7. Q. Hu

In Polymers and Plastics

1. Paul T. Williams
2. Chunfei Wu
3. Dingding Yao
4. Haiping Yang
5. Hanping Chen
6. J. C. Acomb
7. J. Bilbao
8. M. Olazar

Citations in the corpus

• Co-production of hydrogen and carbon nanotubes from catalytic pyrolysis of waste plastics on Ni-Fe bimetallic catalyst (2017, background): “observed, indicating the interaction between active metals and support, it is a key 213 factor for CNT production [24].”
• Carbon nanotubes from post-consumer waste plastics: Investigations into catalyst metal and support material characteristics (2021, background): “It has been reported that the quality and yield of carbon nanomaterials produced from waste plastics are influenced by a range of operational conditions including temperature, steam, feedstock, feed rate, reactor type, and catalyst [13-18].”