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Promoter effect on the CO_2-H_2O formation during Fischer-Tropsch synthesis on iron-based catalysts

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Journal of Natural Gas Chemistry 2010年第2期19卷 193-197页

作者： Ali Nakhaei Pour Seyed Mehdi Kamali Shahri yahya zamani Akbar zamanian Research Institute of Petroleum Industry (RIPI) of National Iranian Oil Company Gas Research DivisionP.O.Box 14665-137TehranIran

The effects of Mg,La and Ca promoters on primary and secondary CO2 and H2O formation pathways during Fischer-Tropsch synthesis on precipitated Fe/Cu/SiO2 catalysts are *** chemisorbed oxygen atoms in the primary pathway formed in the CO dissociation steps reacted with co-adsorbed hydrogen or carbon monoxide to produce H2O and CO2,*** secondary pathway was the water-gas shift *** results indicated that the CO2 production led to an increase in both primary and secondary pathways,and H2O production decreased when surface basicity of the catalyst increased in the order Ca 〉 Mg 〉 La.

关键词： Ca promoter Mg promoter La promoter Fischer-Tropsch synthesis iron-based catalyst water-gas shift reaction

Deactivation studies of bifunctional Fe-HZSM5 catalyst in Fischer-Tropsch process

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Journal of Natural Gas Chemistry 2008年第3期17卷 242-248页

作者： Ali Nakhaei Pour Seyed Mehdi Kamali Shahri yahya zamani Mohammad Irani Shohreh Tehrani Research Institute of Petroleum Industry National Iranian Oil Company

A physical mixture of alkali-promoted iron catalyst with binder based on Fischer-Tropsch synthesis and an acidic co-catalyst （HZSM5） for syngas conversion to hydrocarbons was studied in a fixed bed micro reactor. Deactivation data were obtained during the synthesis over a 1400 h period. The deactivation studies on iron catalyst showed that this trend followed the phase transformation Fe2.2C （ ε′） → Fe5C2 （χ） → Fe3C （θ）, and the final predominant phase of the catalyst was Fe3C （θ）. Deactivation of zeolite component in bifunctional catalyst may be caused by coking over the zeolitic component, dealumination of zeolite crystals, and migration of alkali promoters from iron catalyst under synthesis conditions. The deactivation rate of iron catalyst was also obtained.

关键词： catalyst deactivation Fischer-Tropsch synthesis iron catalyst HZSM5 zeolite

Fischer-Tropsch synthesis by reduced graphene oxide nanosheets supported cobalt catalysts: role of support and metal nanoparticle size on catalyst activity and products selectivity

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Frontiers of Chemical Science and Engineering 2021年第2期15卷 299-309页

作者： Hasan Oliaei Torshizi Ali Nakhaei Pour Ali Mohammadi yahya zamani Seyed Mehdi Kamali Shahri Department of Chemistry Faculty of ScienceFerdowsi University of MashhadMashhad ***Iran Gas Research Division Research Institute of Petroleum IndustryTehran ***Iran Department of Chemical Engineering Pennsylvania State UniversityState CollegePA 16801USA

In this paper,a series of cobalt catalysts supported on reduced graphene oxide(rGO)nanosheets with the loading of 5,15 and 30 wt-%were provided by the impregnation *** activity of the prepared catalysts is evaluated in the Fischer-Tropsch synthesis(FTS).The prepared catalysts were carefully characterized by nitrogen adsorption-desorption,hydrogen chemisorption,X-ray diffraction,Fourier transform infrared spectroscopy,Raman spectroscopy,temperature programmed reduction,transmission electron microscopy,and field emission scanning electron microscopy techniques to confirm that cobalt particles were greatly dispersed on the rGO *** results showed that with increasing the cobalt loading on the rGO support,the carbon defects are increased and as a consequence,the reduction of cobalt is *** FTS activity results showed that the cobalt-time yield and turnover frequency passed from a maximum for catalyst with the Co0 average particle size of 15 nm due to the synergetic effect of cobalt reducibility and particle *** products selectivity results indicated that the methane selectivity decreases,whereas the C5+selectivity raises with the increasing of the cobalt particle size,which can be explained by chain propagation in the primary chain growth reactions.

关键词： cobalt catalyst cobalt particle size Fischer-Tropsch synthesis reduced graphene oxide supported catalyst

费托合成反应中纳米铁催化剂上La和Ba助剂的协同效应(英文)

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催化学报 2012年第7期33卷 1119-1124页

作者： yahya zamani Mehdi BAKAVOLI Mohamad RAHIMIZADEH Ali MOHAJERI Seyed Mohamad SEYEDI Department of Chemistry Ferdowsi University of MashhadAzadi SquareMashhad91735-48974Iran Research Institute of Petroleum Industry(RIPI) National Iranian Oil Company West Blvd. Near Azadi Sports Complex P.O.BOX 14665-137TehranIran

Effect of promoters such as Barium and Lanthanum has been investigated on the conventional nanostructured iron catalyst in Fischer-Tropsch synthesis (FTS). The nanosized iron-based catalysts were prepared by a microemulsion method with the general formulation of 100Fe/4Cu, 100Fe/4Cu/2La, 100Fe/4Cu/ 1La/1Ba, and 100Fe/4Cu/2Ba. The phase, structure, and morphology of the catalysts were characterized by X-ray diffraction, N2 adsorption, transmission electron microscopy, temperature-programmed desorption of CO2, and temperature- programmed reduction. The results indicated that the addition of promoters could improve the activity of Fe catalysts for FTS and WGS (water-gas shift reaction) and lower the gas fraction at the outlet. In addition, both Ba- and La-promoted Fe catalysts exhibit the highest activity due to the synergetic effect.

关键词：纳米结构铁催化剂协同作用 Ba 合成透射电子显微镜水煤气变换反应 Fe催化剂