Abstract
CaO is widely used for capturing CO2 in large scale application however the work on the manufacture of CaO based pellets for the application of CO2 capture is relatively limited. In this research investigated the effect of calcium precursors (Ca(OH)2, Ca(NO3)2 and Ca(CH3COO)2) and their synthesis method (sol-mixing and wet-mixing) on pelletization. Adsorbent synthesized from Ca(CH3COO)2 as a precursor using sol-mixing pelletize to porous spherical provide the best mechanical strength and CO2 adsorption capacity 0.51 and 0.41 g CO2/ g CaO at first cycle and tenth cycle respectively. The outstanding cyclic performance of Ca(CH3COO)2 sol-mixing can be ascribed to the presence of inert support material i.e. Ca9Al6O18 and Ca12Al14O33 with suitable pore volume to prevent sintering of CaO and structure collapsing at high temperature.
Highlights
A dramatic increase of carbon dioxide, a known greenhouse gas, in atmosphere is a worldwide environmentally concern
The CO2 capture reaction for calcium oxide (CaO) adsorbent is occurred by the reversible reaction between CaO and CO2, named carbonation-calcination reaction [2]
All the samples are composed of CaO, Ca12Al14O33, and Ca9Al6O18 with different compositions depend upon calcium precursor and synthesis method
Summary
A dramatic increase of carbon dioxide, a known greenhouse gas, in atmosphere is a worldwide environmentally concern. Calcium looping is one of potential technologies for the separation of CO2 from flue gas mixture. It can be applied as a sorbent in sorption enhanced reforming for H2 production [1]. The CO2 capture reaction for CaO adsorbent is occurred by the reversible reaction between CaO and CO2, named carbonation-calcination reaction [2]. Such a calcium looping process involves in multicycles carbonation-calcination; the makeup flow of fresh sorbent in calcium looping is still required due to the deactivation of it lead to higher operating cost. The dependent on the type of calcium precursor used is one of interested in this research
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