The influence of binders for the pelletization of fly ash zeolites on sulfur dioxide sorption properties

Clay Minerals ◽  
2020 ◽  
Vol 55 (1) ◽  
pp. 40-47 ◽  
Author(s):  
Natalia Czuma ◽  
Rafał Panek ◽  
Paweł Baran ◽  
Katarzyna Zarębska
Keyword(s):  
Fly Ash ◽  
Sulfur Dioxide ◽  
Sorption Capacity ◽  
Positive Influence ◽  
Sorption Properties ◽  
Technical Problems ◽  
Practical Applications ◽  
Fly Ash Zeolite ◽  
Pressure Diffusion ◽  
Mechanical Durability

AbstractFly ash zeolites are economically and ecologically attractive alternatives to synthetic and natural zeolites. Their use as sulfur dioxide sorbents is one of the possible applications of these materials. During the process of fly ash zeolite synthesis, a light powder is formed, which is not acceptable in practical applications due to technical problems, such as a marked drop in pressure, diffusion limits, hydraulic resistance, clogging in the packed beds and the possibility of losing a bed. It is therefore necessary to perform a pelletization process. Thickening of the material during pelletization influences sorption capacity negatively due to diffusing limitations, while the lack of an additional binder may result in a material of low mechanical durability. In this study, pressure pelletization experiments with fly ash zeolite were performed. Binders were selected on the basis of economic considerations as well as their potential to exert a positive influence on the sorption properties of the produced pellets. Cyclic sorption experiments were conducted (on sulfur dioxide) in which one zeolite powder sample was subjected to pelletization without a binder and another sample was subjected to the process with selected binders added. The results of the experiments were then analysed to ascertain the influence of the pelletization process on sulfur dioxide sorption capacity.

scholarly journals Synthesis of zeolites from fly ash with the use of modified two-step hydrothermal method and preliminary SO2 sorption tests

2018 ◽  
Vol 37 (1-2) ◽  
pp. 61-76 ◽  
Author(s):  
Natalia Czuma ◽  
Paweł Baran ◽  
Wojciech Franus ◽  
Piotr Zabierowski ◽  
Katarzyna Zarębska
Keyword(s):  
Fly Ash ◽  
Sulfur Dioxide ◽  
Hydrothermal Method ◽  
Sorption Capacity ◽  
Negative Influence ◽  
Energy Sector ◽  
Application Field ◽  
Exhaust Gases ◽  
Post Synthesis

Synthesis of zeolites from fly ash is an ecologically justified process aimed at the transformation of energy sector waste – fly ash into microcrystalline zeolites of broad possible application field. In this study, the synthesis of zeolites from fly ash by using a modified two-step synthesis was presented. The aim of such a planned experiment was to use the waste solutions from previous synthesis, in such a way that minimalization of negative influence of post-synthesis wastes on environment was possible. Received materials were tested for its sulfur dioxide sorption capacity, indicating its future possible application to capture SO2 from exhaust gases.

scholarly journals A LEXICOGRAPHIC OPTIMIZATION APPROACH FOR BERTH SCHEDULE RECOVERY PROBLEM IN CONTAINER TERMINALS

Transport ◽  
2016 ◽  
Vol 31 (1) ◽  
pp. 76-83 ◽  
Author(s):  
Qian Zhang ◽  
Qingcheng Zeng ◽  
Hualong Yang
Keyword(s):  
Container Terminals ◽  
Optimization Approach ◽  
Technical Problems ◽  
Trade Off ◽  
Practical Applications ◽  
Lexicographic Optimization ◽  
Multi Stage ◽  
Schedule Recovery ◽  
Equipment Failures ◽  
Recovery Problem

In container terminals, the planned berth schedules often have to be revised because of disruptions caused by severe weather, equipment failures, technical problems and other unforeseen events. In this paper, the problem of berth schedule recovery is addressed to reduce the influences caused by disruptions. A multi-objective, multi-stage model is developed considering the characteristics of different customers and the trade-off of all parties involved. An approach based on the lexicographic optimization is designed to solve the model. Numerical experiments are provided to illustrate the validity of the proposed Model A and algorithms. Results indicate that the designed Model A and algorithm can tackle the berth plan recovery problem efficiently because the beneficial trade-off among all parties involved are considered. In addition, it is more flexible and feasible with the aspect of practical applications considering that the objective order can be adjusted by decision makers.

Diamond Films: Recent Developments

MRS Bulletin ◽  
1998 ◽  
Vol 23 (9) ◽  
pp. 16-21 ◽  
Author(s):  
Dieter M. Gruen ◽  
Ian Buckley-Golder
Keyword(s):  
High Temperature ◽  
Integrated Circuits ◽  
Nuclear Power ◽  
Large Scale ◽  
Diamond Films ◽  
Chemical Vapor ◽  
Large Area ◽  
Technical Problems ◽  
Practical Applications ◽  
Single Crystal Diamond

Carbon in the form of diamond is the stuff of dreams, and the image of the diamond evokes deep and powerful emotions in humans. Following the successful synthesis of diamond by high-pressure methods in the 1950s, the startling development of the low-pressure synthesis of diamond films in the 1970s and 1980s almost immediately engendered great expectations of utility. The many remarkable properties of diamond due in part to its being the most atomically dense material in the universe (hardness, thermal conductivity, friction coefficient, transparency, etc.) could at last be put to use in a multitude of practical applications. “The holy grail”—it was realized early on—would be the development of large-area, doped, single-crystal diamond wafers for the fabrication of high-temperature, extremely fast integrated circuits leading to a revolution in computer technology.Excitement in the community of chemical-vapor-deposition (CVD) diamond researchers, funding agencies, and industrial companies ran high in expectation of early realization for many of the commercial goals that had been envisioned: tool, optical, and corrosion-resistant coatings; flat-panel displays; thermomanagement for electronic components, etc. Market projection predicting diamond-film sales in the billions of dollars by the year 2000 was commonplace. Hopes were dashed when these optimistic predictions ran up against the enormous scientific and technical problems that had to be overcome in order for those involved to fully exploit the potential of diamond. This experience is not new to the scientific community. One need only remind oneself of the hopes for cheap nuclear power or for high-temperature superconducting wires available at hardware stores to realize that the lag between scientific discoveries and their large-scale applications can be very long. Diamond films are in fact being used today in commercial applications.

scholarly journals Frontier Progress of Unmanned Aerial Vehicles Optical Wireless Technologies

Sensors ◽  
2020 ◽  
Vol 20 (19) ◽  
pp. 5476
Author(s):  
Jupeng Ding ◽  
Hongye Mei ◽  
Chih-Lin I ◽  
Hui Zhang ◽  
Wenwen Liu
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Transmission Rate ◽  
Experimental Testing ◽  
High Reliability ◽  
Communication Link ◽  
Optical Wireless ◽  
Wireless Technology ◽  
Technical Problems ◽  
Practical Applications ◽  
Aerial Vehicles

With the continuous maturity of unmanned aerial vehicles (UAV) in materials, communications, and other related technologies, the UAV industry has developed rapidly in recent years. In order to cope with the diversified emerging business forms, the explosive growth of the scale of data traffic, number of terminal connections, high reliability, low-latency, and high transmission rate provided by the fifth generation (5G) network will inject new vitality into the development of the UAVs industry. In this paper, optical wireless technology is introduced into the UAV platform, combining theory with practical applications. We explain many research advances and key technologies in the four aspects of “air, space, earth, and sea” to achieve a strong and broadband communication link. This discussion focuses on link modeling, parameter optimization, experimental testing, and the status quo of UAVs in different application scenarios with optical wireless link configurations. At the same time, based on the current situation of UAV optical wireless technology, the technical problems and the research direction in the future are also discussed.

scholarly journals SO2 sorption properties of fly ash zeolites

2020 ◽  
Vol 44 (1) ◽  
pp. 155-167 ◽  
Author(s):  
Natalia CZUMA ◽  
Wojciech FRANUS ◽  
Paweł BARAN ◽  
Agnieszka ĆWIK ◽  
Katarzyna ZARĘBSKA
Keyword(s):  
Fly Ash ◽  
Sorption Properties

CeO 2 /Pd Nanoparticles Incorporated Fly Ash Zeolite: An Efficient and Recyclable Catalyst for C sp 2 ‐C sp 2 Bond Formation Reactions

2020 ◽  
Vol 34 (9) ◽  
Author(s):  
Seth Sheeba Thavamani ◽  
Murugesan Sudharsan ◽  
Anitha Santhana Mariya ◽  
Devarajan Suresh ◽  
Arlin Jose Amali ◽  
...  
Keyword(s):  
Fly Ash ◽  
Bond Formation ◽  
Pd Nanoparticles ◽  
Recyclable Catalyst ◽  
Fly Ash Zeolite ◽  
Bond Formation Reactions

scholarly journals Closing the loop in a constructed wetland for the improvement of metal removal: the use of Phragmites australis biomass harvested from the system as biosorbent

2020 ◽  
Author(s):  
Elisabetta Bianchi ◽  
Andrea Coppi ◽  
Simone Nucci ◽  
Alexandra Antal ◽  
Chiara Berardi ◽  
...  
Keyword(s):  
Sorption Capacity ◽  
Phragmites Australis ◽  
Constructed Wetland ◽  
Metal Removal ◽  
Operation Mode ◽  
Batch Process ◽  
Practical Applications ◽  
Closing The Loop ◽  
Reed Plants ◽  
Fe Ions

Abstract Among the numerous clean-up techniques for water treatment, sorption methods are widely used for the removal of trace metals. Phragmites australis is a macrophyte commonly used in constructed wetlands for water purification, and in the last decades, its use as biosorbent has attracted increasing attention. In view of a circularly economy approach, this study investigated improvement of trace metal removal by recycling the biomass of P. australis colonizing a constructed wetland, which operates as post-treatment of effluent wastewater from an activated sludge plant serving the textile industrial district of Prato (Italy). After the annual mowing of the reed plants, the biomass was dried and blended to derive a sustainable and eco-friendly biosorbent and its sorption capacity for Fe, Cu, and Zn was investigated comparing the batch system with the easier-to-handle column technique. The possibility of regeneration and reuse of the biosorbent was also evaluated. The biomaterial showed an interesting sorption capacity for Cu, Fe, and Zn, both in batch and in column experiments, especially for Fe ions. The immobilization of the biosorbent in column filters induced some improvement in the removal efficiency, and, in addition, this operation mode has the advantage of being much more suitable for practical applications than the batch process.

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