Download or read book Fischer Tropsch Synthesis Over SiO2 ZnO and MnO Supported Cobalt Catalysts written by Richard Neil Walsh and published by . This book was released on 1998* with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fischer Tropsch Synthesis written by and published by . This book was released on 2016 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).
Download or read book Fischer Tropsch Synthesis written by Robert James Colmyer and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Bench scale Studies of the Fischer Tropsch Synthesis Over Iron Nickel and Nickel Cobalt Catalysts Japan written by Shiro Watanabe and published by . This book was released on 1951 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fischer Tropsch Synthesis Over Supported Cobalt Catalysts written by Kalala Jalama and published by . This book was released on 2007 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nano carbon Supported Cobalt Catalysts in Fischer Tropsch Synthesis written by Amadeus Rose and published by . This book was released on 2013 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Silica Gel Supported Cobalt Catalysts for Fischer Tropsch Synthesis written by Hui Ming and published by . This book was released on 1993 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Fischer Tropsch Synthesis written by Robert Bernard Anderson and published by . This book was released on 1984 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fischer Tropsch Synthesis Over Cobalt Supported Catalysts written by Sølvi Storsæter and published by . This book was released on 2005 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Promoters Mn Zn and ZrO2 on the Characterization of SBA 15 Supported Cobalt Catalyst for Fischer tropsch Synthesis written by Muhammad Suhaimi Man and published by . This book was released on 2012 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fischer-Tropsch synthesis (FTS) is a part of gas-to-liquids (GTL) technology, which produces synthetic liquid hydrocarbons from natural gas. Recently the production of clean fuels and particularly of synthetic diesel by means of the FTS process has aroused renewed interest in both industrial and academic field. This process was shown to be catalyzed by certain transition metals, such as Co which present the highest activity. This research work is about the synthesis of SBA-15 and preparation of catalyst with different promoter Zr, Zn, Mn - Co based supported by SBA-15 by wet impregnation catalysts and characterizes all sampling. All materials were characterized by several physico-chemical techniques such as TGA, SEM and FTIR. The catalytic and characterization results show a great influence of mesoporous support porosity on the structure, reducibility and FTS catalytic behavior of cobalt oxide species supported over these ordered materials. After modification of SBA-15 by Co with different loading, the particles found to be attached closely with each other. The SEM picture shows a large number of SBA-15 particles attaching closely with one another. So this will make catalyst more efficient and effective during FT process. Then, using FTIR, the functional groups will be observed with certain wavelength in the samples such as cobalt oxides, Si-O-Si, Si-CH3, zinc oxide, OH band, Si-C, and others. Besides that, the identification of metal inside SBA-15 was determined by comparing the pure SBA-15 with the incorporated metal on SBA-15. For this research, the characterization of the catalyst by selecting Zn as promoter have quiet similar characterization with noble metal that already investigate.
Download or read book Fischer Tropsch Synthesis Studies On Titania Supported Cobalt Catalyst written by Mohammad Aslam and published by . This book was released on 2017-01-14 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Characterization of Silica Supported Iron cobalt Catalysts for Fischer Tropsch Synthesis written by Robert Merrill Stanfield and published by . This book was released on 1981 with total page 363 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Slurry Phase Fischer Tropsch Synthesis written by and published by . This book was released on 1988 with total page 59 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report details experiments performed on three different copper-based catalysts: Cu/Cr[sub 2]O[sub 3], Cu/MnO/Cr[sub 2]O[sub 3] and Cu/ZnO/Al[sub 2]O[sub 3]. Of these three catalysts, the Cu/ZnO/Al[sub 2]O[sub 3] exhibits the greatest stability when slurried in octacosane. More than 1000 hours-on-stream indicate that the catalyst activity is not detrimentally affected by high pressure, high H[sub 2]/CO ratio, or the presence of alkenes. All of these are necessary stability characteristics for the water-gas shift catalyst, if it is to be used in combination with a cobalt Fischer-Tropsch catalyst. A review of documented reduction procedures for cobalt-based Fischer-Tropsch catalysts is presented.
Download or read book Synthesis and Characterization of Cobalt Supported TiO2 with Mn Zn Zr Promoters for Fischer Tropsch Synthesis written by Mohamad Firdaus Mohamad Ghazali and published by . This book was released on 2012 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: This research about the synthesis and characterization cobalt supported TiO2 catalyst for Fischer-Tropsch synthesis (FTS) producing clean and best fuel. In variety of type of promoters, the effect is determined. The catalytic material will be prepared by impregnation of a mesoporous molecular sieve based on silica which is TiO2 as cobalt catalytic supporters and Zn/Zr/Mn as promoters for comparison purposes. All materials will be used characterizing by several physico-chemical techniques such as SEM, , TGA, FTIR. The catalytic and characterization results achieve give a great influence of mesoporous support porosity on the structure, reducibility and Fischer-Tropsch synthesis catalytic behavior of cobalt oxide species supported over these ordered materials. The size of supported cobalt oxide species formed during the calcination step increased with the average pore size (Dp) of the mesoporous support. Thus, the catalyst with larger Co oxide species located in wide pore silica showed to be easily reducible, more active and very selective toward the fuel fraction. The additional of promoters will be used to increase the performances of Fischer-Tropsch synthesis.
Download or read book Fischer Tropsch Synthesis Over Ru group Ib SiO2 Catalysts written by John C. Kelzenberg and published by . This book was released on 1990 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fischer Tropsch Synthesis Over Cobalt Catalysts written by Xuezhi Zhang and published by . This book was released on 1985 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Kinetic Study of the Modified Fischer Tropsch Synthesis Over an Alumina supported Cobalt Oxide Catalyst written by Danny Chien Lu and published by . This book was released on 1985 with total page 966 pages. Available in PDF, EPUB and Kindle. Book excerpt:
