Various single and blended amines
(namely, MEA(monoethanolamine),
MEA-DEEA (2-diethylamino ethanol), MEA-MDEA (methyldiethanolamine),
MEA-1DMA2P (1-dimethylamino-2-propanol)) with three types of catalysts
(H-ZSM-5, MCM-41 and SO4
2–/ZrO2) were studied to determine the respective roles of catalyst and
solvent in heat duty and CO2 desorption rate with an initial
CO2 loading of 0.5 mol CO2/mol amine at 371
K. The results show that performance of the three catalysts in all
the four investigated aqueous solution systems followed the trend:
H-ZSM-5 > MCM-41 > SO4
2–/ZrO2. These results highlight the fact that even though HZSM-5
has moderate
acidic sites as compared to MCM-41 and SO4
2–/ZrO2, its large B/L acid sites ratio coupled with mesopore
surface area had the best performance. Furthermore, based on this
study, the blended system of aqueous 5 M MEA+1 M MDEA with H-ZSM-5
provided the best approach for solution regeneration because the strong
electron withdrawing chemical structure of MDEA.
In this paper, a universal charge-controlled mem-elements (including memristor, memcapacitor, and meminductor) emulator consisting of off-the-shelf devices is proposed. With the unchanged topology of the circuit, the emulator can realize memristor, memcapacitor, and meminductor, respectively. The proposed emulation circuit has a simple mathematical relationship and is constructed with few active devices and passive components, which not only reduces the cost but also facilitates reproduction and facilitates future application research. The grounding and floating forms of the circuit are demonstrated, and Multisim circuit simulation and breadboard experiments validate the emulator's effectiveness. Furthermore, a universal mem-elements chaotic circuit is designed by using the proposed mem-elements emulator and other circuit elements, which is a deformation circuit of Chua's dual circuit. In this circuit, no matter whether the mem-element is memristor, memcapacitor, or meminductor, the chaotic circuit structure does not change, and all can generate hyper-chaos.
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