The promoter effect of alkali in Fischer-Tropsch iron and cobalt catalysts

Gaube, Johann; Klein, Hans‐Friedrich

doi:10.1016/j.apcata.2008.08.007

Cited by 122 publications

(79 citation statements)

References 26 publications

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“…Promoters are used to enhance activity and modify the selectivity to target products [87][88][89][90][91][92][93]. In Fischer-Tropsch synthesis, there is no need to use any promoter for Ru-based catalysts due to its high catalytic activity.…”

Section: Enhancing Catalyst Activitymentioning

confidence: 99%

Application of Fischer–Tropsch Synthesis in Biomass to Liquid Conversion

2012

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Fischer-Tropsch synthesis is a set of catalytic processes that can be used to produce fuels and chemicals from synthesis gas (mixture of CO and H 2 ), which can be derived from natural gas, coal, or biomass. Biomass to Liquid via Fischer-Tropsch (BTL-FT) synthesis is gaining increasing interests from academia and industry because of its ability to produce carbon neutral and environmentally friendly clean fuels; such kinds of fuels can help to meet the globally increasing energy demand and to meet the stricter environmental regulations in the future. In the BTL-FT process, biomass, such as woodchips and straw stalk, is firstly converted into biomass-derived syngas (bio-syngas) by gasification. Then, a cleaning process is applied to remove impurities from the bio-syngas to produce clean bio-syngas which meets the Fischer-Tropsch synthesis requirements. Cleaned bio-syngas is then conducted into a Fischer-Tropsch catalytic reactor to produce green gasoline, diesel and other clean biofuels. This review will analyze the three main steps of BTL-FT process, and discuss the issues related to biomass gasification, bio-syngas cleaning methods and conversion of bio-syngas into liquid hydrocarbons via Fischer-Tropsch synthesis. Some features in regard to increasing carbon utilization, enhancing catalyst activity, maximizing selectivity and avoiding catalyst deactivation in bio-syngas conversion process are also discussed.

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Section: Enhancing Catalyst Activitymentioning

confidence: 99%

Application of Fischer–Tropsch Synthesis in Biomass to Liquid Conversion

2012

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“…It is, therefore, rational to extend our understanding on Li in promoting NH 3 decomposition to other catalytic processes. Indeed, a few recent investigations implied or proposed similar functionality of alkali metals in Fischer-Tropsch synthesis [23] and water-gas shift reaction. [24] In this context, a map linking the TM catalyst, the promoter A in proper chemical form and the reactive species X of an elementary reaction may be built up by searching combination of TM, A, and X that is relatively stable than [TM-X] by experimental trials and/or high-throughput computational materials design.…”

Section: Methodsmentioning

confidence: 98%

Lithium Imide Synergy with 3d Transition‐Metal Nitrides Leading to Unprecedented Catalytic Activities for Ammonia Decomposition

Guo

Wang

et al. 2015

Angewandte Chemie

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Alkali metals have been widely employed as catalyst promoters; however, the promoting mechanism remains essentially unclear. Li, when in the imide form, is shown to synergize with 3d transition metals or their nitrides TM(N) spreading from Ti to Cu, leading to universal and unprecedentedly high catalytic activities in NH 3 decomposition, among which Li 2 NH À MnN has an activity superior to that of the highly active Ru/carbon nanotube catalyst. The catalysis is fulfilled via the two-step cycle comprising: 1) the reaction of Li 2 NH and 3d TM(N) to form ternary nitride of LiTMN and H 2 , and 2) the ammoniation of LiTMN to Li 2 NH, TM(N) and N 2 resulting in the neat reaction of 2 NH 3 ÐN 2 + 3 H 2 . Li 2 NH, as an NH 3 transmitting agent, favors the formation of higher Ncontent intermediate (LiTMN), where Li executes inductive effect to stabilize the TMÀN bonding and thus alters the reaction energetics.

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“…Obviously, the catalyst preparation or pretreatment methodologies will have a significant effect on the catalytic properties. Regarding this, many studies have been conducted with various catalyst preparation methods [4,[15][16][17][18][19][20][21][22]. For example, Snel [4] prepared three kinds of iron catalysts by impregnation, ion-exchange and coprecipitation, and observed different catalytic behaviors.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Silica Supported Nickel Catalyst for Methanation with Improved Activity by Room Temperature Plasma Treatment

Shi

Liu

2009

Catal Lett

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Room temperature glow discharge plasma was applied to treat the nickel precursor supported on SiO 2 . According to the catalyst characterization, the calcination thermally of the plasma treated sample shows small particle size and high dispersion. Such prepared sample presents high conversions of carbon monoxide and hydrogen for the reaction of methanation with a significantly improved anticarbon deposition performance. The plasma-treated sample shows enhanced metal-support interaction and keeps good dispersion after reaction.

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The promoter effect of alkali in Fischer-Tropsch iron and cobalt catalysts

Cited by 122 publications

References 26 publications

Application of Fischer–Tropsch Synthesis in Biomass to Liquid Conversion

Application of Fischer–Tropsch Synthesis in Biomass to Liquid Conversion

Lithium Imide Synergy with 3d Transition‐Metal Nitrides Leading to Unprecedented Catalytic Activities for Ammonia Decomposition

Characterization of Silica Supported Nickel Catalyst for Methanation with Improved Activity by Room Temperature Plasma Treatment

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