DEVELOPMENT OF ATTRITION RESISTANT IRON-BASED FISCHER-TROPSCH CATALYSTS

摘要: Fischer-Tropsch (FT) synthesis to convert syngas (CO + H{sub 2}) derived from natural gas or coal liquid fuels and wax is a well-established technology. For low 2} CO ratio produced CO{sub reforming of gasification coal, the use Fe catalysts attractive because their high water shift activity in addition FT activity. are also due cost methane selectivity. Because highly exothermic nature reaction, there has been recent move away fixed-bed reactors toward development slurry bubble column (SBCRs) that employ 30 90 {micro}m catalyst particles suspended waxy for efficient heat removal. However, an SBCR problematic severe attrition resulting fines plug filter employed separate product. can undergo SBCRs not only vigorous movement collisions but phase changes occur during activation reaction. The objectives this research were develop better understanding parameters affecting F-T suitable incorporate into design novel having superior resistance. prepared by co-precipitation, followed binder spray drying at 250 C 1 m diameter, 2 tall dryer. silica content was varied 0 20 wt %. results show small amounts precipitated SiO{sub alone spray-dried result good All investigated with wt% {le} 12 less than 10 jet cup test, making them long-term reactor. Thus, concentration rather type incorporated more critical impact on resistance catalysts. Lower added give higher particle densities therefore resistances. In order produce catalyst, however, amount be optimized provide adequate surface area, density, Two tested Texas A&M University's CSTR (Autoclave Engineers). Spray-dried compositions 100 Fe/5 Cu/4.2 K/11 (P) K/1.1 (B) have excellent selectivity characteristics (low C{sub 5}{sup +} yields), productivity stability (deactivation rate) need improved. Mechanical integrity (attrition strength) these two markedly dependent upon morphological features. strength made out largely spherical (1.1 considerably consisting irregularly shaped (11 2}).