| [Wei Yulin,Shi Guopu,Chen Sique,Yang Hailing,Ji Jun,Chen Yingying,Li Xinyu,Ma Deli,Pan Baocai,Zhang Zhenyu and Wang Honglei.P-modified γ-Al2O3/α-Al2O3 Foams with High Porosity as Palladium-Catalyzed Carriers[J].Rare Metal Materials and Engineering,2023,52(1):87~94.] |
| P-modified γ-Al2O3/α-Al2O3 Foams with High Porosity as Palladium-Catalyzed Carriers |
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| Received:March 26, 2022 Revised:July 03, 2022 |
| DOI： |
| Key words: γ-Al2O3/α-Al2O3 foams palladium catalyst P-modification high porosity CO catalytic combustion |
| Foundation item:国家自然科学基金（批准号51872118，51632003），山东省重点研发计划（批准号2020JMRH0401，2019RKB01018），山东省自然科学基金（批准号ZR2018PEM008，ZR2019MEM055） |
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| Abstract: |
| A novel method for the preparation of α-alumina foams with P-γ-Al2O3 modified coating for the palladium catalysts was proposed. The polyurethane template method was used and the preparation parameters were optimized. The apparent porosity of the ceramic foam is 90.28%, the bulk density is 0.45 g·cm-3, and the strength of ceramic foam is satisfying. The P-modified γ-Al2O3 coating was prepared on the α-alumina foam, and then the active catalytic phase (Pd) was loaded by ultrasound-assisted impregnation. Results show that the P-containing coating increases the surface area and weakly acidic sites of the inert foam while decreasing the proportion of strongly acidic sites. Compared with the uncoated foam, the foam with modified coating can easily load the active phase. In addition, the loaded Pd metal can hardly be oxidized, and the catalytic conversion temperature (T50, T90) of CO reduces by about 50 °C. This research presents the great practical potential of low-cost modified α-Al2O3 ceramic foams in the palladium catalyst production. |
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