An Amine Double Functionalized Composite Strategy for CO2 Adsorbent Preparation using a ZSM‐5/KIT‐6 Composite as a Support. Issue 9 (25th July 2018) - Lin, Zhifeng
Abstract: An amine double functionalized composite strategy is used to fabricate grafted‐impregnated micro‐/mesoporous composites for CO2 capture. The micro‐/mesoporous three‐dimensional cross straight zeolite and cubic silica structural ZSM‐5/KIT‐6 composite is used as a support, N 1 ‐(3‐trimethoxysilylpropyl)diethylenetriamine (TMPTA) is used as the grafted component, and tetraethylenepentamine (TEPA) or branched polyethyleneimine (PEI) is used as the impregnated component. The amine efficiency, adsorption kinetics, enthalpy of adsorption, thermal stability, regeneration performance, the effects of types of impregnated amines (TEPA or PEI) and loadings (30–60 %), and temperatures (60–90 °C) on CO2 adsorption performance are investigated using thermal gravimetric analyzer (TGA) in the mixed gases (15 % CO2 and the balance is N2 ). At 75 °C, the double functionalized sample with TEPA impregnation displays the highest CO2 adsorption capacity of 6.28 mmol g −1 even at high TEPA loading of 60 %, while that of 4.69 mmol g −1 is obtained for the PEI‐impregnated compound at PEI loading of 50 %. The former has higher amine efficiency and faster kinetics as well as higher enthalpy. The composites demonstrate excellent CO2 adsorption performance compared to other amine double functionalized silicas, indicating the prospect of these adsorbents for CO2 capture from actual flue gas after desulfurization (60–85 °C). Abstract : Double your fun ! An amine double functionalized three‐dimensional cross straight zeolite and cubic silica structural ZSM‐5/KIT‐6 composite with high nitrogen content is synthesized. ZSM‐5/KIT‐6 composite (ZK) is an excellent support for double functionalization for CO2 capture from flue gas at 60–90 °C. The tetraethylenepentamine (TEPA)‐containing composite shows excellent performance for CO2 capture (6.28 mmol g −1 with an amine efficiency of 0.423) at 75 °C and release at 110 °C with recyclability.