Study of Reaction Kinetics for Elemental Mercury Vapor Oxidation for Mercury Emission Control
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University of Cincinnati / OhioLINK
2017
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ndltd-OhioLink-oai-etd.ohiolink.edu-ucin15052069446681752021-08-03T07:04:23Z Study of Reaction Kinetics for Elemental Mercury Vapor Oxidation for Mercury Emission Control Sriram, Vishnu Chemical Engineering Reaction kinetics heterogeneous elemental mercury oxidation reaction cupric chloride mercury emissions control grain model Elemental mercury (Hg(0)) is a persistent, toxic metal that is released during the combustion of coal in power plants. Its toxicity, and bioaccumulation is of concern for public health and the environment. The need to control and capture mercury is of importance and relevant in today’s world since coal still plays a significant role as it is one of the major energy sources in the United States. While elemental mercury is difficult to capture, oxidized mercury (Hg(2+)) is captured easily due to its high solubility in water and its ability to easily adsorb onto sorbents such as powdered activated carbon (PAC). Previously in our lab, CuCl2-based substrates have been tested and has shown good potential to play a role in oxidizing Hg(0). Mechanistic studies have been performed on CuCl2-based substrates and a fundamental understanding of the adsorption of Hg(2+) onto activated carbon (AC) has been investigated in the past.In order to understand the oxidation kinetics of CuCl2 and the role it plays in oxidizing Hg(0) oxidation using CuCl2-based substrate, experiments and kinetic simulations were performed to obtain the activation energy for this reaction. It was found that CuCl2 played an important role in lowering the activation energy for this reaction compared to other reported values of Hg(0) oxidation catalysts under HCl and O2 conditions. This work is discussed in Chapter 2.In addition, we wanted to study the various factors that can impact the adsorption of Hg(2+) in the ductwork and fabric filter by raw AC injection in coal combustion flue gas. Factors such as internal, external mass transfer, inlet HgCl2 concentration, sorbent loading, and particle size were studied and its impact on the performance was investigated. In-flight Hg(2+) removal was found to be negligible while comparatively, the removal of Hg(2+) in the fabric filter was better but it was negligible nevertheless. For the removal of Hg(2+) in fabric filter, the effect of particle size was significant. A novel discontinuous injection mode was used and resulted in higher sorbent utilization. However at the end of the cleaning cycle, most of the sorbent capacity was < 0.2%. This work is discussed in Chapter 3. 2017 English text University of Cincinnati / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=ucin1505206944668175 http://rave.ohiolink.edu/etdc/view?acc_num=ucin1505206944668175 unrestricted This thesis or dissertation is protected by copyright: some rights reserved. It is licensed for use under a Creative Commons license. Specific terms and permissions are available from this document's record in the OhioLINK ETD Center. |
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NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
Chemical Engineering Reaction kinetics heterogeneous elemental mercury oxidation reaction cupric chloride mercury emissions control grain model |
| spellingShingle |
Chemical Engineering Reaction kinetics heterogeneous elemental mercury oxidation reaction cupric chloride mercury emissions control grain model Sriram, Vishnu Study of Reaction Kinetics for Elemental Mercury Vapor Oxidation for Mercury Emission Control |
| author |
Sriram, Vishnu |
| author_facet |
Sriram, Vishnu |
| author_sort |
Sriram, Vishnu |
| title |
Study of Reaction Kinetics for Elemental Mercury Vapor Oxidation for Mercury Emission Control |
| title_short |
Study of Reaction Kinetics for Elemental Mercury Vapor Oxidation for Mercury Emission Control |
| title_full |
Study of Reaction Kinetics for Elemental Mercury Vapor Oxidation for Mercury Emission Control |
| title_fullStr |
Study of Reaction Kinetics for Elemental Mercury Vapor Oxidation for Mercury Emission Control |
| title_full_unstemmed |
Study of Reaction Kinetics for Elemental Mercury Vapor Oxidation for Mercury Emission Control |
| title_sort |
study of reaction kinetics for elemental mercury vapor oxidation for mercury emission control |
| publisher |
University of Cincinnati / OhioLINK |
| publishDate |
2017 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1505206944668175 |
| work_keys_str_mv |
AT sriramvishnu studyofreactionkineticsforelementalmercuryvaporoxidationformercuryemissioncontrol |
| _version_ |
1719453190203637760 |