The state of calcium as a char gasification catalyst — a temperature-programmed reaction study

✍ Scribed by J.P. Joly; D. Cazorla-Amoros; H. Charcosset; A. Linares-Solano; N.R. Marcilio; A. Martinez-Alonso; C.Salinas-Martinez de Lecea

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 809 KB
• Volume: 69
• Category: Article
• ISSN: 0016-2361
• DOI: 10.1016/0016-2361(90)90235-i

✦ Synopsis

The purpose of this study was to characterize the calcium (nature, amount of various species and state of division) in carbonaceous materials such as low-rank coal char or a model char (obtained by pyrolysis of a polymeric resin at 1273 K under an inert gas). Ca loading (~6 wt%) was performed by impregnation or ionic exchange of various char samples with an acetate solution. The experimental method involved performing temperature-programmed reactions (TPR) with Ca-containing char samples, under a low partial pressure of CO, in an inert gas stream, by increasing and then decreasing the temperature in the range 3061200 K. Samples were previously outgassed by temperature-programmed desorption (TPD) under He up to 1200 K. The various CO2 and CO peak curve features (apart from the gasification reaction) were interpreted as follows. Desorption of physisorbed CO, on char takes place at a low temperature (< 380 K),