Development of AEI type germanoaluminophosphate (GeAPO-18) with ultra-weak acid sites and its catalytic properties for the methanol to olefin (MTO) reaction
| Autor: | Shunsuke Tanaka, Hasna Al Jabri, Manabu Miyamoto, Yuichiro Hirota, Norikazu Nishiyama, Yoshiaki Uchida, Koji Miyake, Kaito Ono, M. Nakai |
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| Rok vydání: | 2017 |
| Předmět: |
chemistry.chemical_classification
Olefin fiber Chemistry Inorganic chemistry 02 engineering and technology Coke Solid acid 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Catalysis 0104 chemical sciences chemistry.chemical_compound Acid strength Methanol 0210 nano-technology Brønsted–Lowry acid–base theory Zeolite |
| Zdroj: | Catalysis Science & Technology. 7:4622-4628 |
| ISSN: | 2044-4761 2044-4753 |
| Popis: | Zeolites have been widely applied as sophisticated solid acid catalysts in chemical industries. Tuning the acidic properties of zeolites is very important to improve their catalytic performances and expand their utilization. Herein, we synthesized AEI-type Ge-incorporated aluminophosphate, GeAPO-18, by a dry gel conversion method in order to generate new acidity. GeAPO-18 had weaker Bronsted acid sites than the conventional SAPO-18. To confirm the effect of the substitution of Ge, we carried out the methanol to olefin (MTO) reaction over GeAPO-18 and the conventional SAPO-18. The catalyst lifetime of GeAPO-18 in the MTO reaction was longer than that over the conventional SAPO-18. The rate of coke deposition on GeAPO-18 was slower than that on the conventional SAPO-18. These results indicated that the decreased acid strength of GeAPO-18 could retard the coke formation via undesired successive reactions. The incorporation of Ge into the aluminophosphate zeolite framework was a crucial method for tuning the acid strength, which provides a new direction for the design of solid acid catalysts. |
| Databáze: | OpenAIRE |
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