A class of high molecular
weight polyethylenimine (PEI)-modified
zeolite 13X adsorbents were synthesized by varying the concentration
of imines and screened for preliminary investigation of CO2 capture studies. The impregnated molecular amine zeolite composite
was characterized and CO2 adsorption performance was investigated
through TGA in the presence of atmospheric pure CO2 gas
at 25, 50, 75, and 100 °C, respectively, using 20–80 wt
% of PEI-loaded zeolite 13X adsorbents. This paper reports on the
effects of temperature and amine (PEI) loading on CO2 adsorption
capacity and estimated kinetic parameters through modeling of selected
models which represent the reaction rate and diffusion rate models.
The studied adsorbents showed the highest adsorption capacity at 75
°C with 60 wt % PEI loading. Thus, the optimum temperature of
75 °C and optimal loading of 60 wt % was observed from the current
studies for CO2 capture. From modeling study, it was found
that Avrami’s fractional order and dual kinetic models (DKM)
described well the adsorption behavior of CO2 on PEI-impregnated
zeolite 13X at all temperatures accurately and up to 75 °C, respectively.
Besides, intraparticle diffusion was found to be the rate-limiting
step when compared with the film diffusion model.
In the quest for better quality of life and living standards, people living in rural areas are expected to move to urban locales. As this trend continues, more than half of world's population is expected to make cities their place of dwelling. To meet this massive influx of rural masses into urban areas, the cities world over need to equip themselves with robust infrastructure that provides necessary amenities like, adequate & clean power, hygienic water in sufficient quantities and accommodation that makes optimum use of resources in a sustainable manner. Based on these requirements, a host of applications like, smart power generation & distribution, smart traffic management, smart waste management & utilization, smart governance, etc., are being developed. The paper discusses few research issues and challenges related to the development of IT infrastructure for smart cities. Research efforts in this direction, however, appear to be application centric. Not much attention has been given to develop an IT based holistic infrastructural framework for smart cities. To this end, we develop a conceptual architecture: Smart WSN-based Infrastructural Framework for smart Transactions (SWIFT) that provides a ubiquitous platform for seamless interaction of various smart objects, devices and systems. In this paper, we introduce the SWIFT architecture and discuss issues related to its implementation.
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