Title : Fisher-Tropsh synthesis in the presence of dispersed catalysts on the basis of ir-pyrolysed metal-polymer systems
Abstract:
The synthesis of synthetic liquid hydrocarbons from synthesis gas by Fischer-Tropsch synthesis (SFT) is central part of most XTL (GTL, CTL, BTL) processes. Constant instability in the oil market and relentless reduction of reserves of light extracted oil make research of the processes of converting any carbon-containing raw material into hydrocarbons relevant. One of the trends in the development of SFT technologies is search of new catalytic systems, and also development of nanotechnologies promoting emergence of new unique materials - nanocomposites, one of features of which is synergy of the matrix and the dispersed component.
For the first time, a number of nanoscale cobalt- and iron-polymer catalytic systems based on cellulose, polyvinyl alcohol, and polystyrene were synthesized for Fischer-Tropsch synthesis. Their catalytic activity in the synthesis of liquid hydrocarbons from CO and H2 was established.
It is found that the composite materials produced by pyrolysis of metal salt compounds and polymers mixes can be formed by polycondensation or destructive scheme.
It is established that composite materials represent evenly distributed metal-containing nanoparticles in pyrolyzed matrix, and the phase structure and size of particles depends on temperature of thermolysis.
It is shown that during synthesis of the composite material, nanoparticles which show activity in the Fischer-Tropsch synthesis without the preliminary reduction step distributed in the pyrolyzed matrix are formed. At the same time, the CO conversion on samples containing cellulose, PAN, PVA in it composition, aspired to 100%.
It is revealed that nature of the initial polymer component of composite material has a significant effect on the catalytic properties of composites, with systems forming a system of polyconjugate bonds having the greatest activity, which can cause high contact productivity (up to 4800 g / kgMe • h).
It is assumed that the matrix formed during the synthesis of the composite is not only a dispersed medium for nanoparticles, but also a component of the catalytic center at which dissociative adsorption takes place and subsequent hydrogenation of carbon monoxide.This work was done as part of TIPS RAS State Plan
