کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
230959 1427405 2012 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
High-pressure gas–solid carbonation route coupled with a solid ionic liquid for rapid synthesis of rhombohedral calcite
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
High-pressure gas–solid carbonation route coupled with a solid ionic liquid for rapid synthesis of rhombohedral calcite
چکیده انگلیسی

A novel carbonation route for the synthesis of CaCO3 is reported with high pressure CO2 scintillated into dry Ca(OH)2 powder containing a solid ionic liquid (SIL, tetra-n-heptyl-ammonium bromide). Results show that calcite structure with rhombohedral lattice is produced at all CO2 conditions investigated: supercritical (15.0 MPa, 50.0 °C), compressed (5.0 MPa, 30.0 °C), liquid (15.0 MPa, 25.0 °C), gaseous (0.1 MPa, 30.0 °C) and atmospheric (0.1 MPa, 30.0 °C). Furthermore, rapid and complete conversion is achieved under the supercritical condition with the production of nano-sized calcite particles, suggesting that coupling SIL with CO2 could be an effective system for enhancing traditional gas–solid reactions. A mechanism for the rapid gas–solid carbonation reaction is proposed with emphasis on the initialization of the reaction by tiny adsorbed water and CO2 dissolved in the SIL.

Figure optionsDownload as PowerPoint slideHighlights
► A novel carbonation process was proposed by using CO2 coupled with SIL.
► Rapid and complete conversion of Ca(OH)2 was achieved by the process.
► Rhombohedral structures were obtained at all conditions with the process.
► The initialization of the reaction by tiny adsorbed water in SIL was proposed.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: The Journal of Supercritical Fluids - Volume 72, December 2012, Pages 78–83
نویسندگان
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