Shreenath Krishnamurthy

SINTEF | Stiftelsen for industriell og teknisk forskning · Industry

A 3D-printed sorbent containing polyethylene-imine and multi-walled carbon nanotubes (PEI-MWCNT) was studied for post-combustion carbon capture. In this work, the adsorbent was printed on a kg scale and characterized for CO 2 adsorption through lab experiments. A 6-step VSA process was simulated using the lab data to capture CO 2 from a representat...

Structured sorbents with better adsorption kinetics and lower pressure drop than packed beds of conventional adsorbents are gaining increasing attention due to the potential advantages of smaller footprint and lower energy consumption in a CO2 capture process. The aim of this computational study is to examine the potential improvement in productivi...

The present work is dedicated to the preparation and characterization of carbon-based electrodes for the removal of phosphates and nitrate ions from wastewater by CDI method. Carbons obtained from the pyrolysis were used to prepare electrodes and these electrodes were characterized using a number of experimental techniques. Based on the experimenta...

This fully computational work is dedicated to the simulation and optimization of a 6-step VSA process to study the performance of 3D printed amino silane containing sorbent. The performance of the 3D printed sorbent was compared with a representative packed bed. Rigorous optimization showed that that it was possible to achieve 2.35 times improvemen...

The present work aims to study a vacuum swing adsorption (VSA) process for CO2 capture from a biomass fired powerplants. In this work a series of novel adsorbents were prepared combining polyethylene-imine (PEI) with various nanomaterials such as multi-walled carbon nanotubes (CNT) in different ratios. In the present study, these adsorbents were pr...

An important driver in the development of adsorption-based CO2 capture technologies is the reduction of cost through increasing the productivity. The 3D-CAPS project aims to increase the productivity (kg CO2/m³hr) of such technologies through structuring, enabled by 3D-printing. This productivity increase would allow for a reduction of the size of...

Processes that utilize solid adsorbents to capture CO2 are promising alternatives to state-of-art Amine based technologies for capturing CO2 from large point sources. Although the energy needs of solid sorbent-based processes are low, the process footprint and consequently the capital cost connected to its implementation can be large due to the rel...

The aim of this work was to evaluate the performance of three different supported amine sorbents in a 6-step vacuum swing adsorption (VSA) cycle through process simulation and optimization for a representative post-combustion CO2 capture system. Detailed process optimization revealed that all the adsorbents were able to achieve the desired purityre...

Computational screening methods have changed the way new materials and processes are discovered and designed. For adsorption-based gas separations and carbon capture, recent efforts have been directed toward the development of multiscale and performance-based screening workflows where we can go from the atomistic structure of an adsorbent to its eq...

UTSA-16 is considered as one of most promising Metal-Organic Frameworks (MOFs) for post combustion carbon capture in a vacuum swing adsorption (VSA) process. Current studies base their predictions on the equilibrium information for the crystalline material and assuming that the mass transfer is dominated by macropore diffusion. Performance of the r...

In this work monolithic adsorbents containing polyethyleneimine (PEI) and multiwalled carbon nanotubes obtained by 3D printing. CO2 and N2 isotherms were measured using a commercial volumetric apparatus. Breakthrough experiments were carried out with a synthetic flue gas containing 15% CO2 and the rest N2. The information was used to simulate and o...

The aim of this work was to evaluate the performance of three different supported amine sorbents in a 6-step vacuum swing adsorption (VSA) cycle through process simulation and optimization for a representative post-combustion CO 2 capture system. Detailed process optimization revealed that all the adsorbents were able to achieve the desired purity-...

Supported amine sorbents are extensively studied in literature due to their moisture tolerating abilities. Most of the work with this group of adsorbents pertain to experimental studies on adsorption capacity, kinetics, and stability tests on powdered sorbents. Only a handful of published studies have carried out thermodynamic assessment and proces...

Multiscale computational screening methods have been accelerating materials discovery and technology deployment in many areas from batteries to alloys. In this review, we focus on post-combustion carbon capture using adsorption in porous materials. Prompted by the recent unprecedented developments in material science, researchers in material engine...

The present work involves the scale-up and characterization of CPO-27–Ni metal organic framework using a range of experimental techniques aimed at determining equilibrium and kinetic parameters to assess its potential for post-combustion carbon capture. CPO-27–Ni was prepared from its precursors by molecular gastronomy methods in kilogram scale. Ad...

Well-shaped 300-700 microns spheres of aggregated metal-organic framework CPO-27-Ni crystallites have been produced using a spray-granulation method with cross bonded alginate as binder. The spheres are suitable for use in a moving-bed temperature-swing adsorption (MBTSA) process for post-combustion CO2 capture. The adsorption isotherm data of CO2,...

Adsorption-based post-combustion CO2 capture is enjoying significant research attention due to its potential for significant reductions in energy penalty, cost and environmental impact. Recent sorbent development work has focussed on polyethyleneimine (PEI) and dry sorbents that exhibit attractively low regeneration energy requirements. The main ob...

Multiscale material screening strategies combine molecular simulations and process modelling to identify the best performing adsorbents for a particular application, such as carbon capture. The idea to go from the properties of a single crystal to the prediction of the material performance in a real process is both powerful and appealing, however i...

The capture and concentration of CO2 from a dry flue gas by vacuum swing adsorption (VSA) has been experimentally demonstrated in a pilot plant. The pilot plant has the provision for using two coupled columns that are each packed with approximately 41 kg of Zeochem zeolite 13X. Breakthrough experiments were first carried out by perturbing a N2 satu...

Science and Engineering Research Council (SERC) of Singapore in 2009 launched a research programme on Carbon Capture and Utilization (CCU). One project under the programme is entitled, Development and Demonstration of an Adsorption-based System for Post-combustion Carbon Capture, which will be the basis of this presentation. It is a collaborative p...

Adsorption and diffusion of CO2, N2 and Water vapour on 13X Zeolite and Silica gel K.Shreenath1, R Haghpanah2, Arvind Rajendran2 and S. Farooq1 1Department of Chemical and Biomolecular engineering, National University of Singapore, Singapore -117576 2School of Chemical and Biomedical engineering, Nanyang Technological University, Singapore...