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A hyperstable zeolite catalyst for methanol-to-olefin conversion

By Tetsuo Satoh |

The New Energy and Industrial Technology Development Organization (NEDO, Kawasaki City; Japan; www.nedo.go.jp), in partnership with Japan Technological Research Assn. of Artificial Photosynthetic Chemical Process (ARPChem) members, Mitsubishi Chemical Corp. and the Tokyo Institute of Technology, has developed a hyperstable zeolite catalyst that provides high-yield productivity for lower olefins (C2–C4) from methanol. Using methanol synthesized from CO2, the researchers demonstrated the methanol-to-olefin (MTO) process using a compact, fixed-bed pilot facility installed at Mitsubishi Chemical. With the new MTO process, the researchers were also able to prevent a reduction in catalytic activity, even after steam processing at temperatures higher than 500°C. In the new zeolite catalyst, acid sites attributable to tetra-coordinated aluminum within the zeolite framework are catalytically active for the MTO reaction. It was confirmed that these active sites are stable and maintain catalytic activity, even after high-temperature steam treatment. The new catalyst was shown to have a lifetime of 1,500 h at 500°C, which is nearly twice that of existing MTO catalyst systems, and it can endure de-coking treatment, NEDO says. Researchers…
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