A low-cost route to the syntheses of microporous cobalt-substituted aluminophosphates by using the waste mother-liquor
✍ Scribed by Fangzheng Duan; Jiyang Li; Peng Chen; Jihong Yu; Ruren Xu
- Publisher
- Elsevier Science
- Year
- 2009
- Tongue
- English
- Weight
- 763 KB
- Volume
- 126
- Category
- Article
- ISSN
- 1387-1811
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✦ Synopsis
In an attempt to synthesize microporous materials with respect to green chemistry, we investigate the syntheses of cobalt-substituted aluminophosphate molecular sieves by a low-cost approach through recycling waste mother-liquors of two layered aluminophosphates Mu-4 and AlPO-IM prepared in the Al(iPrO) 3 -H 3 PO 4 -Tem-TEG system (Tem: diethylamine or imidazole, TEG: triethylene glycol). A Cosubstituted aluminophosphate [C 8 H 24 N 2 ][Al 8 Co 2 P 10 O 40 ] (denoted CoAPO-CJ51) was obtained with the addition of Co 2+ ions into the mother-liquor of Mu-4. Its structure is analogous to zeotype GIS with 20% occupancy by Co 2+ ions in the metal site, and the protonated diethylamine molecules are located in the 8-ring channels. Co-substituted aluminophosphate [C 3 H 5 N 2 ][Al 2 CoP 3 O 12 ] (denoted CoAPO-CJ52) was obtained with the addition of Co 2+ ions into the mother-liquor of AlPO-IM. Its structure is analogous to zeotype LAU with 33.3% occupancy by Co 2+ ions in the metal site, and the protonated imidazole molecules are located in the 10-ring channels. Both compounds are characterized by single-crystal X-ray diffraction analysis, ICP and TG analyses.