Production of high quality gasoline from waste polyethylene derived heavy oil over Ni-REY catalyst in steam atmosphere
✍ Scribed by Takao Masuda; Hiroshi Kuwahara; Shin.R. Mukai; Kenji Hashimoto
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- English
- Weight
- 262 KB
- Volume
- 54
- Category
- Article
- ISSN
- 0009-2509
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✦ Synopsis
Nickel and rate earth metal exchanged Y-type zeolite catalyst (Ni-REY) was prepared for producing light fuels (gasoline and kerosene) by the catalytic cracking of heavy oil from waste plastics in a steam atmosphere. The Ni in the catalyst was found to exhibit catalysis for transportation of hydrogen atoms from steam to hydrocarbons. In a steam atmosphere, strong acid sites of the catalyst, which usually cause excessive cracking, were covered with steam molecules, leading to a high yield of liquid fuels. Experiments using MFI zeolite in a nitrogen atmosphere were also conducted for comparison. During the repetition of sequences of reaction and regeneration of the catalysts, MFI zeolite was gradually deactivated, whereas Ni-REY was found to show constant activity. Furthermore, the selectivity towards gasoline was higher than MFI zeolite (Ni-REY in steam: 78%, MFI type zeolite in N : 35%).