Synthetic Doped Amorphous Ferrihydrite for the Fischer鈥揟ropsch Synthesis of Alternative Fuels

详细信息    查看全文

• 作者：Sumit Bali ; Garima Bali ; Frank E. Huggins ; Mohindar S. Seehra ; Vivek Singh ; Jared M. Hancock ; Roger Harrison ; Gerald P. Huffman ; Ronald J. Pugmire ; Richard D. Ernst ; Edward M. Eyring
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2012
• 出版时间：March 28, 2012
• 年：2012
• 卷：51
• 期：12
• 页码：4515-4522
• 全文大小：406K
• 年卷期：v.51,no.12(March 28, 2012)
• ISSN：1520-5045

文摘

Ferrihydrites (FHYDs) with the general formula of FeOOH路nH₂O are naturally occurring oxyhydroxide minerals found in environments varying from river beds, lakes, and marshes to even living organisms. Here, we report the synthesis of a new kind of synthetic doped amorphous two-line FHYDs containing aluminum and copper, which are not usually known to be found in nature. Transmission electron microscopy carried out on synthetic FHYDs showed them to be amorphous in nature with some nanosized groupings in the form of nanoclusters of about 50鈥?00 nm size without any hint of diffraction fringes associated with crystalline order. The synthetic doped FHYDs exhibit unique properties and have been characterized extensively by magnetic measurements, X-ray diffraction, and electron microscopy as well as by M枚ssbauer spectroscopic studies. After promotion with potassium, these FHYDs were found to have high activity as catalysts for the Fischer鈥揟ropsch (F鈥揟) conversion of syngas to liquid fuels over a period of 100 h in a fixed bed reactor at 265 掳C and 100 psig pressures. The comparison of the preliminary 100 h data for the synthetic doped FHYD catalyst with those of a commercial fixed-bed catalyst pretreated under similar conditions suggests somewhat better catalytic activity of the synthetic doped FHYD than that of the commercial fixed-bed catalyst. The F鈥揟 oil and wax obtained as products were characterized extensively using gas chromatography, quantitative ¹³C NMR, and distortionless enhancement by polarization transfer NMR.