Carbon Dioxide Adsorption Using Activated Carbon via Chemical Vapor Deposition Process

Abstract

This research aims to study the physical-chemical characteristics and carbon dioxide adsorption using commercial activated carbon (GAC) by comparing with commercial activated carbon. Chemical vapor deposition (CVD) of carbon molecular sieve prepared from activated carbon (CMS_GAC) was prepared using acetylene at various conditions, such as temperature, time and acetylene flow rate. The results indicated that CMS_GAC had high adsorption capacity and high selectivity for the adsorption ratio between carbon dioxide and methane. The experiments were carried out by using the samples of GAC, CMS_GAC, and commercial carbon molecular sieve (CMS_COM) for adsorption of mixed gas of 30% CO₂, 20% N₂, and 50% CH₄, respectively. The results showed that the adsorption efficiency at 50% of inlet carbon dioxide concentration of GAC, CMS_GAC, and CMS_COM was at 85, 114, and 140 min, respectively. The purity of methane was 81.53, 93.16, and 98.26%, respectively. The selectivity for the adsorption ratio between carbon dioxide and methane was 1.32, 16.52, and 24.89, respectively. The cycle time of the samples was 3, 7, and 8 cycles, respectively. Finally, the maximum adsorption capacity of the samples was 1.74, 3.26, and 4.06 mole CO₂/kg absorbent, respectively.