In the present work we made an effort to examine the influence of the ruthenium particle size in the wide range of its dispersion on the catalytic activity of Ru/graphitized carbon systems in CO methanation. There is also lack of information concerning the effect of Ru crystallite sizes on the activity of Ru/C systems. However, there are few papers dealing with the activity of ruthenium deposited on thermally modified carbons. Many literature reports give information about the influence of different factors on the activity of oxide-supported Ru systems. Ruthenium dispersed on high-surface area oxide supports has been found to exhibit high activity in the methanation of CO and CO 2. Some experimental works and density functional theory (DFT) calculations also indicate that ruthenium exhibits excellent activity in CO methanation. However, hydrogenation of CO x to methane can be catalyzed by several metals. Supported Ni-based catalysts have been applied commercially on methanation due to their high activity, selectivity to CH 4 and low costs. That is the reason why many groups are still working to obtain highly active and selective catalysts for that reaction. Due to the poor reserves of natural gas in some regions of the world, conversion of syngas from coal or biomass to synthetic natural gas (SNG) via the methanation reaction is also attracting great attention. The CO hydrogenation has also attracted increasing interest recently because of its potential as a simple technique for CO removal from H 2-rich feed gases for fuel cells. For simple fits, though, there are more simple apps which can do the job.The methanation of CO is widely used in industrial plants for the preparation of synthesis gas for ammonia synthesis. However, I don't think Fityk is intended for graph plotting quite so much, an area where this feature would be used most.įityk is a powerful, professional curve-fitter, so try it out if you need to fit any complex data or have time to learn to use it. This is one area which needs a bit of work - a standard spreadsheet-type layout for the editor would probably be more usable - it's cramped and fiddly at the moment. You can't interact with the graph by clicking data points (although you can drag curves around with the mouse), so you have to use the data editor. If you untick a record, it won't be considered in the fit (useful for fitting only to sections of the data).įityk is a useful app, but it can be frustrating to use. Just one more pointer - press Data | Editor. When you want to see the whole graph again, press the 'View whole' button on the toolbar (looks like a magnifying glass). Click and drag in this pane to zoom in on a section of the graph. Right-click on this area to change comparison modes. You can use this to show the deviation of each data point from the fitted equation, which makes it easier to identify possible anomalies. You'll see that just below the main plot is an auxiliary plot. This will run a fitting algorithm and find the best fit for your data. For the fun to begin, press the next button to the right, 'Start fitting'. This will just plonk a new line on the graph. Then, press the button right next to that drop-down, 'auto-add'. What does your data look like? There's a drop-down box on the toolbar which lets you choose what type of function the program should try to fit, so obviously choose 'linear' if it's a straight line and so on. This will make it easier to see what the hell you've got! Fityk will plot your data on the black graph pane - right cick anywhere in this area and choose a larger 'data point size'. Press Data | Load File, change the file type to 'all files' and open the file. Get your dataset in CSV (comma seperated value) form and fire-up Fityk. It still took a while to get any use out of it, though. It definitely has a learning curve, but fortunately there's a comprehensive manual to help out. I've been using it to fit functions to lab data, and it works pretty well. So here goes.įityk is a curve-fitting application with a moderately intimidating interface. I've decided to blog about some of the software I've been using to make my life easier, and maybe some of the music that I've been enjoying too.
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