Modeling the Change of Green Coke to Calcined Coke Using Qingdao High-Sulfur Petroleum Coke

Xiao, Jin; Zhong, Qifan; Li, Fachuang; Huang, Jindi; Zhang, Yanbin; Wang, Bingjie

doi:10.1021/acs.energyfuels.5b00021

Cited by 45 publications

(38 citation statements)

References 22 publications

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“…Despite sulfur's positive effect on the carboxy reactivity, too high levels of S are unwanted because they leave the cell as environmentally unfriendly gases. In CPC in some cases sulfur has been observed as a thiophene-containing polycyclic aromatic hydrocarbons [12][13][14][15]. In the high sulfur cokes studied here for metal impurities, a previous study has shown that the sulfur is present as elemental sulfur or at least contains S-S bonds [16].…”

Section: Introductionmentioning

confidence: 80%

An EXAFS and XANES Study of V, Ni, and Fe Speciation in Cokes for Anodes Used in Aluminum Production

Jahrsengene

Wells

Sommerseth

et al. 2019

Metall Mater Trans B

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Lower quality petroleum coke is required to be used in anode manufacture containing S and the metal impurities V, Ni and Fe. These affect the anode performance in the aluminium production process. The chemical identity of the metal species in the coke is not known.Industrial petroleum cokes with high S and containing V, Ni and Fe were analysed by XANES and EXAFS. XANES spectra were compared with standards. EXAFS was used to compare the impurity metal structures with known crystal structures. V is present largely as hexagonal V3S4. Ni is present largely as hexagonal NiS. Fe is present as hexagonal FeS. XAS measurement and analysis

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Section: Introductionmentioning

confidence: 80%

An EXAFS and XANES Study of V, Ni, and Fe Speciation in Cokes for Anodes Used in Aluminum Production

Jahrsengene

Wells

Sommerseth

et al. 2019

Metall Mater Trans B

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“…[16] The proportions of S-S bound sulfur (identified from S 8 in the LCF) vary between the different cokes from 16 to 53 pct of the total S giving 0.3 to 2.3 wt pct of this kind of sulfur in the cokes. The exact kind of compound is unknown, but large amounts of sulfides with sulfur in the oxidation state À 1 (e.g., FeS 2 ) are unlikely due to the much higher quantity of sulfur vs metals (Figure 7(d)).…”

Section: Discussionmentioning

confidence: 99%

“…[16] These may also contain some thiazines. Limited information can be obtained on the organic sulfur standards using the K-edge.…”

Section: E(evmentioning

confidence: 99%

“…[15] Thiophenes have also been detected in cokes by a combination of X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared spectroscopy (FTIR), and simulations. [16] How these sulfur-containing hydrocarbons transform during electrolysis, mainly by producing COS and SO 2 gases, has also been investigated. [15,17] For non-electrochemical (secondary) reactions such as air burn, CO 2 burn, and carbon dusting, cell temperature, anode manufacturing parameters, and raw material properties (coke and pitch) are important.…”

Section: Introductionmentioning

confidence: 99%

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A XANES Study of Sulfur Speciation and Reactivity in Cokes for Anodes Used in Aluminum Production

Jahrsengene

Wells

Rørvik

et al. 2018

Metall Mater Trans B

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Availability of anode raw materials in the growing aluminum industry results in a wider range of petroleum cokes being used to produce carbon anodes. The boundary between anode grade cokes and what previously was considered non-anode grades are no longer as distinct as before, leading to introduction of cokes with higher sulfur and higher trace metal impurity content in anode manufacturing. In this work, the chemical nature of sulfur in five industrial cokes, ranging from 1.42 to 5.54 wt pct S, was investigated with K-edge XANES, while the reactivity of the cokes towards CO2 was measured by a standard mass loss test. XANES identified most of the sulfur as organic sulfur compounds. In addition, a significant amount is identified (16 to 53 pct) as S-S bound sulfur. A strong inverse correlation is observed between CO2-reactivity and S-S bound sulfur in the cokes, indicating that the reduction in reactivity is more dependent on the amount of this type of sulfur compound rather than the total amount of sulfur or the amount of organic sulfur.

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“…The brominated process and the complete reaction mechanisms of mercury removal by simulation were presented. As shown in Figure 8 , these edge models were selected from the large molecular structure of uncalcined petroleum coke [ 69 ]. Generally, the standard to distinguish whether it is physical or chemical adsorption is the adsorption energy of 42 KJ/mol.…”

Section: Micro-scale Mechanism Of Physical-chemical Evolution Of Hspc...mentioning

confidence: 99%

The Effects of Physical-Chemical Evolution of High-Sulfur Petroleum Coke on Hg0 Removal from Coal-Fired Flue Gas and Exploration of Its Micro-Scale Mechanism

Jiang

Diao

2022

IJERPH

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As the solid waste by-product from the delayed coking process, high-sulfur petroleum coke (HSPC), which is hardly used for green utilization, becomes a promising raw material for Hg0 removal from coal-fired flue gas. The effects of the physical–chemical evolution of HSPC on Hg0 removal are discussed. The improved micropores created by pyrolysis and KOH activation could lead to over 50% of Hg0 removal efficiency with the loss of inherent sulfur. Additional S-containing and Br-containing additives are usually introduced to enhance active surface functional groups for Hg0 oxidation, where the main product are HgS, HgBr, and HgBr2. The chemical–mechanical activation method can make additives well loaded on the surface for Hg0 removal. The DFT method is used to sufficiently explain the micro-scale reaction mechanism of Hg0 oxidation on the surface of revised-HSPC. ReaxFF is usually employed for the simulation of the pyrolysis of HSPC. However, the developed mesoporous structure would be a better choice for Hg0 removal in that the coupled influence of pore structure and functional groups plays a comprehensive role in both adsorption and oxidation of Hg0. Thus, the optimal porous structure should be further explored. On the other hand, both internal and surface sulfur in HSPC should be enhanced to be exposed to saving sulfur additives or obtaining higher Hg0 removal capacity. For it, controllable pyrolysis with different pyrolysis parameters and the chemical–mechanical activation method is recommended to both improve pore structure and increase functional groups for Hg0 removal. For simulation methods, ReaxFF and DFT theory are expected to explain the micro-scale mechanisms of controllable pyrolysis, the chemical–mechanical activation of HSPC, and further Hg0 removal. This review work aims to provide both experimental and simulational guidance to promote the development of industrial application of Hg0 adsorbent based on HSPC.

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Modeling the Change of Green Coke to Calcined Coke Using Qingdao High-Sulfur Petroleum Coke

Cited by 45 publications

References 22 publications

An EXAFS and XANES Study of V, Ni, and Fe Speciation in Cokes for Anodes Used in Aluminum Production

An EXAFS and XANES Study of V, Ni, and Fe Speciation in Cokes for Anodes Used in Aluminum Production

A XANES Study of Sulfur Speciation and Reactivity in Cokes for Anodes Used in Aluminum Production

The Effects of Physical-Chemical Evolution of High-Sulfur Petroleum Coke on Hg0 Removal from Coal-Fired Flue Gas and Exploration of Its Micro-Scale Mechanism

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