| Project/Area Number |
15550136
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Environmental chemistry
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| Research Institution | Muroran Institute of Technology |
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Principal Investigator |
UEMICHI Yoshio Muroran Institute of Technology, Faculty of Engineering, Professor, 工学部, 教授 (90168659)
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| Project Period (FY) |
2003 – 2004
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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 2004: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 2003: ¥2,600,000 (Direct Cost: ¥2,600,000)
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| Keywords | Waste Plastics / polypropylene / Recycling / Catalyst / Composite Catalysts / Borosilicate / MCM-41 / ポリオレフィン / 低級オレフィン / ホウ素触媒 |
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| Research Abstract |
The catalytic activities of H-borosilicate, mesoporous silica MCM-41, and their mixtures for the degradation of polyolefins have been investigated in order to develop a technology for chemical recycling of waste plastics. The borosilicate characterized by an MFI microporous structure and a low acidity was effective as a catalyst for the conversion of polypropylene to lower olefins with carbon numbers of 2-5, while ordered mesoporous MCM-41 with an average pore diameter of 3.8 nm and a very low acidity was less effective for the reaction. However, highly efficient catalysts were prepared when the borosilicate and MCM-41 were physically mixed. The composite catalysts showed higher selectivities to the lower olefins than those of the pure catalysts. The highest selectivity was observed at 1:1 mixture. Acidity measurements using NH_3-TPD revealed no formation of newly acidic sites on the composite. It is therefore suggested the excellent performance of the composite catalyst is attributed to the mesopores of MCM-41 that are appropriate to convert large decomposed fragments to small molecules.
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