Fischer-Tropsch Synthesis Over SiO2, ZnO and MnO Supported Cobalt Catalysts PDF Download

Author: Richard Neil Walsh
Publisher:
ISBN:
Category :
Languages : en
Pages : 188

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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 11

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The effect of ammonia in syngas on the performance of various supported cobalt catalysts (i.e., Al2O3, TiO2 and SiO2) was investigated during Fischer-Tropsch synthesis (FTS) using a continuously stirred tank reactor (CSTR). The addition of ammonia (10 ppmv NH3) caused a significant deactivation for all supported cobalt catalysts, but the rate of deactivation was higher for the silica-supported catalysts relative to the alumina and titania-supported catalysts used in this work. Ammonia addition had a positive effect on product selectivity (i.e., lower light gas products and higher C5+) for alumina and titania-supported catalysts compared to ammonia free conditions, whereas, the addition of ammonia increased lighter hydrocarbon (C1-C4) products and decreased higher hydrocarbon (C5+) selectivity compared to ammonia-free synthesis conditions for the silica-supported catalyst. For alumina and titania-supported catalysts, the activity almost recovered with mild in-situ hydrogen treatment of the ammonia exposed catalysts. For the silica-supported catalyst, the loss of activity is somewhat irreversible (i.e., cannot be regained after the mild hydrogen treatment). Addition of ammonia led to a significant loss in BET surface area and changes in pore diameter (consistent with pore collapse of a fraction of pores into the microporous range as described in the literature), as well as formation of catalytically inactive cobalt support compounds for the silica-supported catalyst. On the other hand, the pore characteristics of alumina and titania-supported catalysts were not significantly changed. In conclusion, XANES results of the ammonia exposed silica-supported catalysts further confirm the formation of cobalt-support compounds (cobalt silicates).

Author: Robert James Colmyer
Publisher:
ISBN:
Category :
Languages : en
Pages :

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ABSTRACT: The Fischer-Trospch (F-T) synthesis of liquid hydrocarbon fuels from biomass-derived synthesis gas (CO + H2) is a promising way of producing renewable ultra-clean diesel fuel. The Fischer Tropsch process has been used commercially for many decades using coal or natural gas as a feedstock. Recently the focus has switched to renewable resources, such as biomass. Significant effort has been spent developing efficient Fischer-Tropsch catalysts, but very little is known about the effects of nanoparticle oxide supports for Fischer-Tropsch catalysts. In this research project the objectives were to 1) design and build a F-T reactor and 2) use the system to develop new efficient F-T catalysts. A number of different catalysts were prepared, carefully characterized and tested for F-T activity. The initial study involved the effects of support pretreatment and catalyst precursor quality. In addition, ZrO2-promotion was investigated in detail for Co catalysts supported on nanoparticle (n-SiO2) and porous (p-SiO2) silica supports. The results show that the support pretreatment and catalyst precursor have limited effects on the catalytic activities and selectivities. It was also found that ZrO2 addition increases activity and in some cases selectivity with minimal difference between Co/n-SiO2 and Co/p-SiO2.

Author: Shiro Watanabe
Publisher:
ISBN:
Category : Fischer-Tropsch process
Languages : en
Pages : 48

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Author: Kalala Jalama
Publisher:
ISBN:
Category : Fischer-Tropsch process
Languages : en
Pages : 442

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Author: Amadeus Rose
Publisher:
ISBN: 9783844027860
Category :
Languages : en
Pages : 202

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Author: Hui Ming
Publisher:
ISBN:
Category : Cobalt catalysts
Languages : en
Pages : 392

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Author: Robert Bernard Anderson
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 384

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Author: Sølvi Storsæter
Publisher:
ISBN: 9788247171547
Category : Catalyst supports
Languages : en
Pages : 0

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Author:
Publisher: Elsevier
ISBN: 0080466753
Category : Technology & Engineering
Languages : en
Pages : 431

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The declining supply of crude oils worldwide and the ever increasing demand for petroleum products from China, India, Europe and the US have recently propelled crude prices to unprecedented levels. The future availability of traditional crudes is becoming a source of discussion and debate.Fischer-Tropsch Synthesis, Catalysts and Catalysis offers a timely and comprehensive report on the processing of relatively inexpensive coal deposits into transportation fluids using Fisher-Tropsch process Technology. In addition to recent catalysts and process developments, the book contains the history of the Fisher-Tropsch in Germany and Japan based on captured documents by allied forces.* Increase the understanding of FT process development* Addresses four major areas of interest in Fischer-Tropsch synthesis (FTS)