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Effects of promoters (Mn, Mg, Co and Ni) on the Fischer-Tropsch activity and selectivity of KCuFe/mesoporous-alumina catalyst
Applied Catalysis A: General ( IF 5.5 ) Pub Date : 2020-09-24 , DOI: 10.1016/j.apcata.2020.117861
Sandeep Badoga , Girish Kamath , Ajay Dalai

Fischer-Tropsch synthesis (FTS) is one of the promising technologies to produce liquid fuels and fine chemicals from coal, natural gas and biomass. Significant improvements in reactor technology and catalyst development are the focus of research in this area. In this work, the effects of 1.0 wt% promotor such as Mn, Mg, Co and Ni on the FTS activity and selectivity of mesoporous alumina supported KCuFe catalyst were studied. All synthesized promoted catalysts were characterized using BET, XRD, H2-TPR, XPS, TEM and XANES. The FTS reaction was carried out in a fixed bed reactor at 270 °C, 300 psi, 2000 h-1 and H2/CO = 1.25. In this work, the Ni-promoted catalyst showed the highest methane selectivity (˜29%). The Co-promoted catalyst showed the least Olefins/Paraffins (O/P) ratio and a ˜5% increase in methane selectivity. Mg-promoted catalyst performed average but better than Ni and Co-promoted catalysts. However, Mn-supported catalyst outperformed Mg, Ni and Co-promoted catalysts and resulted in higher C5+ selectivity along with a marginal increase in CO conversion. The ˜5%, 2%, and 2% decline in CO2, CH4 and C2-C4 selectivities were also registered upon the addition of Mn promotor. The improvement in FTS activity and selectivity of Mn-promoted catalyst is related to the increase in iron dispersion and reducibility, as seen during H2-TPR, XPS and XANES analyses. The presence of Mn+3 and Mn+4, as confirmed by Mn 2p XPS and Mn K-edge XANES, indicates that the interaction at the electronic level between manganese and iron has contributed to improved performance. This study concludes that Mn is the most effective promotor for the synthesized mesoporous alumina supported KCuFe catalyst for the FT synthesis process.



中文翻译:

助催化剂(Mn,Mg,Co和Ni)对KCuFe /介孔氧化铝催化剂的费托活性和选择性的影响

费-托合成(FTS)是从煤炭,天然气和生物质生产液体燃料和精细化学品的有前途的技术之一。反应器技术和催化剂开发的重大改进是该领域的研究重点。在这项工作中,研究了诸如Mn,Mg,Co和Ni之类的1.0 wt%促进剂对介孔氧化铝负载KCuFe催化剂的FTS活性和选择性的影响。使用BET,XRD,H 2 -TPR,XPS,TEM和XANES对所有合成的助催化剂进行表征。FTS反应在固定床反应器中于270°C,300 psi,2000 h -1和H 2进行/CO=1.25。在这项工作中,镍促进的催化剂显示出最高的甲烷选择性(〜29%)。共助催化剂显示出最小的烯烃/石蜡(O / P)比,甲烷选择性增加了约5%。Mg促进的催化剂表现一般,但优于Ni和Co促进的催化剂。但是,Mn负载的催化剂的性能优于Mg,Ni和Co促进的催化剂,并导致更高的C 5 +选择性以及CO转化率的少量增加。CO 2,CH 4和C 2 -C 4下降约5%,2%和2%在添加Mn促进剂时也记录了选择性。如在H 2 -TPR,XPS和XANES分析中所见,Mn促进的催化剂的FTS活性和选择性的提高与铁分散性和还原性的提高有关。Mn 2p XPS和Mn K-edge XANES证实了Mn +3和Mn +4的存在,表明锰和铁在电子水平上的相互作用有助于改善性能。这项研究得出的结论是,锰是用于FT合成过程的合成介孔氧化铝负载KCuFe催化剂的最有效促进剂。

更新日期:2020-09-24
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