摘要
The effect of ethylene diamine tetraacetic acid(EDTA) modification on the physico-chemical properties and catalytic performance of silica nanosprings(NS) supported cobalt(Co) catalyst was investigated in the conversion of syngas(H^(2+) CO) to hydrocarbons by Fischer-Tropsch synthesis(FTS). The unmodified Co/NS and modified Co/NS-EDTA catalysts were synthesized via an impregnation method. The prepared Co/NS and Co/NS-EDTA catalysts were characterized before the FTS reaction by BET surface area,X-ray diffraction(XRD),transmission electron microscopy(TEM),temperature programmed reduction(TPR),X-ray photoelectron spectroscopy(XPS),differential thermal analysis(DTA) and thermogravimetric analysis(TGA) in order to find correlations between physico-chemical properties of catalysts and catalytic performance. FTS was carried out in a quartz fixedbed microreactor(H_2/CO of 2 ∶1,230 ℃ and atmospheric pressure) and the products trapped and analyzed by GC-TCD and GC-MS to determine CO conversion and reaction selectivity. The experimental results indicated that the modified Co/NS-EDTA catalyst displayed a more-dispersed phase of Co_3O_4 nanoparticles(10.9%) and the Co_3O_4 average crystallite size was about 12.4 nm. The EDTA modified catalyst showed relatively higher CO conversion(70.3%) and selectivity toward C_(6-18)(JP-8,Jet A and diesel) than the Co/NS catalyst(C_(6-14))(JP-4).
The effect of ethylene diamine tetraacetic acid（EDTA） modification on the physico-chemical properties and catalytic performance of silica nanosprings（NS） supported cobalt（Co） catalyst was investigated in the conversion of syngas（H^2＋ CO） to hydrocarbons by Fischer-Tropsch synthesis（FTS）. The unmodified Co/NS and modified Co/NS-EDTA catalysts were synthesized via an impregnation method. The prepared Co/NS and Co/NS-EDTA catalysts were characterized before the FTS reaction by BET surface area,X-ray diffraction（XRD）,transmission electron microscopy（TEM）,temperature programmed reduction（TPR）,X-ray photoelectron spectroscopy（XPS）,differential thermal analysis（DTA） and thermogravimetric analysis（TGA） in order to find correlations between physico-chemical properties of catalysts and catalytic performance. FTS was carried out in a quartz fixedbed microreactor（H2/CO of 2 ∶1,230 ℃ and atmospheric pressure） and the products trapped and analyzed by GC-TCD and GC-MS to determine CO conversion and reaction selectivity. The experimental results indicated that the modified Co/NS-EDTA catalyst displayed a more-dispersed phase of Co3O4 nanoparticles（10.9%） and the Co3O4 average crystallite size was about 12.4 nm. The EDTA modified catalyst showed relatively higher CO conversion（70.3%） and selectivity toward C6-18（JP-8,Jet A and diesel） than the Co/NS catalyst（C6-14）（JP-4）.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2018年第8期957-966,共10页
Journal of Fuel Chemistry and Technology
关键词
化学分析
煤矿
燃烧
silica nanosprings
Fischer-Tropsch synthesis
EDTA
cobalt catalyst
