Journal
APPLIED CATALYSIS A-GENERAL
Volume 620, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcata.2021.118176
Keywords
CHA zeolite; Hydrothermal conversion of zeolite; Phosphorus modification; Phosphorus modifying agent; Interzeolite conversion; Methanol to olefin reaction
Categories
Funding
- JSPS KAKENHI [18KK0136, 20K15090]
- Grants-in-Aid for Scientific Research [18KK0136, 20K15090] Funding Source: KAKEN
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Phosphorus-modified CHA zeolites showed enhanced catalytic performance and prolonged catalyst lifetime in the methanol-to-olefin reaction, with maintained ethene and propene selectivities. Increasing degree of phosphorus modification led to greater retention of non-aromatic hydrocarbons in the catalysts relative to aromatic ones, suggesting that suppression of excess oligomerization of hydrocarbon species contributes to a longer catalyst lifetime.
The catalytic performance of phosphorus-modified CHA zeolites, synthesized by direct phosphorus modification using tetraethylphosphonium as a phosphorus-modifying agent (P-MA), was investigated for the methanol-toolefin (MTO) reaction. Comparative catalytic testing in the MTO reaction revealed that the phosphorus modification effectively prolonged the catalyst lifetime while hardly affecting the ethene and propene selectivities. The initial ethene and propene selectivities over CHA zeolite with P/Al ratio of 0.44 were 28.7 and 37.5 C %, respectively, and the catalytic life time improved from 4 to 7 h compared with the catalyst without phosphorus modification. The relative amount of non-aromatic hydrocarbons retained in the zeolite catalysts with respect to those of the aromatic ones increased with increasing degree of phosphorus modification. This demonstrates that the suppression of excess oligomerization of the hydrocarbon species results in a prolonged lifetime in the phosphorus-modified catalyst.
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