Three kinds of lignite were mixed with K2CO3 and Ca(OH)2 and were gasified with CO2 to investigate the effect that the addition of Ca(OH)2 had on the gasification kinetics. K2CO3 and Ca(OH)2 were impregnated and dried, their mixing ratio was varied, and the gasification experiments were conducted over a temperature range from 850 to 950 °C at atmospheric pressure. The modified volumetric reaction model was applied as the gas–solid reaction model to analyze the carbon conversion results and thus obtain the kinetic parameters. The results indicate that the catalytic activity based on carbon conversion followed the order of K2CO3 5 wt% + Ca(OH)2 3 wt% > K2CO3 8 wt% > K2CO3 3 wt% + Ca(OH)2 5 wt% > K2CO3 1 wt% + Ca(OH)2 7 wt%. The reaction rate was also influenced by the type of lignite, with a higher reactivity observed for Adaro lignite. The highest reaction rate constant was of 44.25 min−1 with Adaro lignite and K2CO3 5 wt% + Ca(OH)2 3 wt% at 950 °C. The lowest activation energy of 44.49 kJ/min was calculated for Mongolia lignite with K2CO3 8 wt%. The reaction rate was enhanced by partly substituting K2CO3 with Ca(OH)2, but further substitution resulted in a decrease in the reaction rate compared to that of K2CO3 alone.
Research on Chemical Intermediates – Springer Journals
Published: Dec 12, 2015
It’s your single place to instantly
discover and read the research
that matters to you.
Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.
All for just $49/month
Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly
Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.
All the latest content is available, no embargo periods.
“Whoa! It’s like Spotify but for academic articles.”@Phil_Robichaud