Molecular models of brown coal containing inorganic species

Domazetis, G.; James, B. D.

doi:10.1016/j.orggeochem.2005.07.006

Cited by 54 publications

(47 citation statements)

References 32 publications

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“…Lignite is low‐rank coal, which accounts for more than 50% of the world's total coal reserves . It retains the macromolecular structure of coal‐forming plants, especially the lignin structure . The important repeating units in both lignite and lignin are methoxylated phenylpropane, which are cross‐linked by C—O bonds (mostly 4‐O‐5, α‐O‐4, and β‐O‐4 linkages) and additionally by C—C bonds .…”

Section: Introductionmentioning

confidence: 99%

“…[1] It retains the macromolecular structure of coal-forming plants, especially the lignin structure. [2] The important repeating units in both lignite and lignin are methoxylated phenylpropane, which are cross-linked by C─O bonds (mostly 4-O-5, α-O-4, and β-O-4 linkages) and additionally by C─C bonds. [3,4] Given its unique structure, making full use of lignite by converting it into value-added aromatic chemicals not only alleviates the growing energy demand, but also relieves energy security and environmental pollution problems.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of Kinetics and Activity of Ni‐Based Catalysts for Benzyl Phenyl Ether Catalytic Hydrogenolysis

et al. 2019

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The influence of the type of support [activated carbon (AC), HZSM‐5, and γ‐Al2O3] on the performance of Ni‐based catalysts for the catalytic hydrogenolysis (CH) of benzyl phenyl ether (BPE) is investigated. The properties of an Ni‐based catalyst are investigated using diverse characterization techniques. An Ni/AC catalyst exhibits the highest dispersion of Ni atoms by CO pulse. The kinetic studies show that the apparent activation energies (Ea) for CH of BPE increase in the order Ea (Ni/AC) < Ea (Ni/γ‐Al2O3) < Ea (Ni/HZSM‐5), and the initial turnover frequencies follow the order of Ni/AC (64 mol molNisurf −1 h−1) > Ni/γ‐Al2O3 (58 mol molNisurf −1 h−1) > Ni/HZSM‐5 (45 mol molNisurf −1 h−1). All these results prove that the CH activity of BPE is significantly affected by the type of support, and Ni/AC is the highest activity catalyst in CH of the C—O bond of BPE. Toluene and phenol are major products in CH of BPE at a relatively low hydrogen pressure and high temperature. Based on catalytic experiments, a reaction mechanism is proposed, which provides the theoretical basis for converting lignite into high‐value organic molecules.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparison of Kinetics and Activity of Ni‐Based Catalysts for Benzyl Phenyl Ether Catalytic Hydrogenolysis

et al. 2019

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“…The inorganic constituents of Victorian lignite are derived from discrete mineral particles, exchangeable cations chemically bound to functional groups and dissolved salts contained in the saturated pores of the lignite. In addition, there are also some inorganics associated with lignite macromolecules by electrostatic interactions [46,47].…”

Section: Inorganics In Atmte Wastewatermentioning

confidence: 99%

A comparison of acid treatment in the dewatering of Chinese and Australian lignites by mechanical thermal expression at high temperatures

Yeasmin

Miao

et al. 2016

Fuel Processing Technology

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“…The doping of low-rank coal with iron showed a significant increase in the H2 content in the gasified product. For addition information with respect to modeling of low-rank coal and the effect of iron doping see the reference Domazetis and James (2006). Vuthaluru and French (2008, laboratory study)-Test work was conducted to evaluate the influence of doping low-rank Indonesian coal with additives on the combustion products produced.…”

Section: Addition or Presence Of Metal Compounds Or Mineral Phases Tomentioning

confidence: 99%

Continuation of Crosscutting Technology Development at Cast

Yoon¹

2012

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5Figure ES-2. Optimization of conditions for leaching Coal B with hydrochloric acid solutions (The selection of time/pH conditions in the dark green region should result in the removal of >30% of the sodium. Note also that a flag has been added to show the amount of sodium in the leach solution, 35% sodium removal, and the sodium content in the product ash). Coal DCoal D showed significantly greater sodium removal than Coal B for similar treatment conditions. The treatability of Coal B is demonstrated in Figures ES3 to ES5. . Coal D leach results for hydrochloric acid solutions (Greater than 75% of the sodium was removed using pH 3 acidic solutions at a 1-hour treatment time. The initial sodium, reported as sodium oxide in the ash, was 6.16 %. The removal of over one-half of the sodium can be achieved using conditions of pH 5, 0.5 hours). Recommended Future StudiesIt is recommended that future studies include, but not be limited to:• Investigation to determine if multiple leach solution contacts with new coal will allow recycle of the leach solution without detrimentally affecting the leachability of the coals and to produce a concentrated sodium bearing solution in order to limit the amount of leach solution that would have to be treated prior to water recycle or disposal.• Water cleanup will be required because of the relatively high sodium and chloride or sulfate content.• Evaluation of where and how the leachate could be introduced into the coal preparation treatment system. • Evaluation of the possible impact of pretreatment on the subsequent shipping and combustion processes.• The anticipated cost of the sodium cleansing treatment and subsequent water treatments. INTRODUCTION BackgroundThe US Department of Energy (DOE) Center for Advanced Separation Technologies (CAST), Great Northern Properties (GN), and the Montana Board Research and Commercialization Technology (MBRCT) are funding this project. The project is being administered and the research directed and conducted at CAMP. The intent of the project is to identify, and validate selected currently used (or previously studied) removal and sodium recovery treatment alternative(s) using laboratory bench-scale tests on four Montana coal samples. If the coals cannot be effectively treated by known techniques, alternative treatments will be developed. The evaluation of selected sodium removal technologies are presently underway and the following four stages are being and will be followed in future work: the successful removal of sodium from the coal so that the ash will content less than three percent, the rate at which the sodium ions are removed, characterization of the waste produced by sodium removal processing, and the overall economics of viable processes. Not part of the initial Project, but a necessary follow-up, will be the scale-up of the most appropriate sodium removal technology(s) in applications with companies using Clean Coal Technology to demonstrate sodium removal process or processes on a pilot scale. Objective and ApproachThe overall ob...

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Molecular models of brown coal containing inorganic species

Cited by 54 publications

References 32 publications

Comparison of Kinetics and Activity of Ni‐Based Catalysts for Benzyl Phenyl Ether Catalytic Hydrogenolysis

Comparison of Kinetics and Activity of Ni‐Based Catalysts for Benzyl Phenyl Ether Catalytic Hydrogenolysis

A comparison of acid treatment in the dewatering of Chinese and Australian lignites by mechanical thermal expression at high temperatures

Continuation of Crosscutting Technology Development at Cast

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