Direct catalytic conversion of synthesis gas to lower olefins

Janardanarao, M.

doi:10.1021/ie00105a001

Cited by 88 publications

(68 citation statements)

References 86 publications

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“…In figure 6c, the CH 4 profiles display three peaks for the coprecipitated samples. As for the sol-gel prepared samples, the amount of CH 4 formation is less than that in the coprecipitated ones, which indicates that the amount of active carbonaceous species is higher on the surface of the coprecipitated Mn/Fe catalysts.…”

Section: Results Of Syngas-tpsrmentioning

confidence: 90%

“…However, from the relative intensities of the CO 2 and H 2 O profiles in figure 6, we can observe more apparently the process of carburization in the samples prepared by coprecipitation. In addition, the triple-peak pattern in the CH 4 profile indicates that there is a higher amount of active C species on the surface of the coprecipitated samples.…”

Section: Discussionmentioning

confidence: 99%

“…As a conventional promoter, manganese has been widely used in many catalysts for Fischer-Tropsch synthesis (FTS) [3][4][5][6], and most researchers agreed that the addition of manganese could modify the iron catalysts to improve the selectivity of light alkenes in the products [7][8][9][10]. In our previous work [9], the promotion effect of manganese on the selectivity to light alkenes has been studied over impregnated iron catalysts supported on silicate-2, and it was found that the manganese could prohibit the secondary hydrogenation of C 2 H 4 and C 3 H 6 .…”

Section: Introductionmentioning

confidence: 99%

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CO Hydrogenation to Light Alkenes Over Mn/Fe Catalysts Prepared by Coprecipitation and Sol-gel Methods

Wang

Sun

et al. 2005

Catal Lett

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CO hydrogenation to light alkenes was carried out on manganese promoted iron catalysts prepared by coprecipitation and sol-gel techniques. Addition of manganese in the range of 1-4 mol.% by means of coprecipitation could improve notably the percentage of C 2 = $C 4 = in the products, but it was not so efficient when the sol-gel method was employed. XRD and H 2 -TPR measurements showed that the catalyst samples giving high C 2 = $C 4 = yields possessed ultrafine particles in the form of pure a-(Fe 1-x Mn x ) 2 O 3 , and high quality in lowering the reduction temperature of the iron oxide. Furthermore, these samples displayed deep extent of carburization and different surface procedures to the others in the tests of Temperature Programmed Surface Carburization (TPSC). The different surface procedures of these samples were considered to have close relationship with the evolving of surface oxygen. It was also suggested that for the catalysts with high C 2 = $C 4 = yields, the turnover rate of the active site could be kept at a relatively high level due to the improved reducing and carburizing capabilities. Consequently, there would be a large number of sites for CO adsorption/dissociation and an enhanced carburization environment on the catalyst surface, so that the process of hydrogenation could be suppressed relatively to a low level. As a result, the percentage of the light alkenes in the products could be raised.

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Section: Results Of Syngas-tpsrmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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CO Hydrogenation to Light Alkenes Over Mn/Fe Catalysts Prepared by Coprecipitation and Sol-gel Methods

Wang

Sun

et al. 2005

Catal Lett

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“…Though zeolites and related ''zeotypes'' (such as silicoaluminophosphates (SAPOs)) play a key role in the MTO and DMO processes, these subjects have been already extensively reviewed [69][70][71] and are out of the scope of the present chapter, which is focused on one-step processes from methane (direct routes) or syngas (indirect routes) catalyzed by zeolites and other molecular sieves. In this sense, the selective synthesis of light olefins can be accomplished directly from syngas [72].…”

Section: Selective Synthesis Of Short-chain (C 2 -C 4 ) Olefinsmentioning

confidence: 99%

“…In the latter case, around 30-35% of the total costs arise from the methanol synthesis step [72]; these costs would be avoided by employing a direct route. Nevertheless, the competitiveness of the direct synthesis of light olefins from syngas seems still far, mainly due to selectivity issues.…”

Section: Selective Synthesis Of Short-chain (C 2 -C 4 ) Olefinsmentioning

confidence: 99%