Isotope Analysis for Understanding the Tar Formation in the Integrated Process of Coal Pyrolysis with CO<sub>2</sub> Reforming of Methane

Wang, Pengfei; Jin, Lijun; Liu, Jiahe; Zhu, Shengwei; Hu, Haoquan

doi:10.1021/ef100637k

Cited by 35 publications

(21 citation statements)

References 21 publications

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“…[ [54][55][56][57] propose a series of studies on integrated process of coal pyrolysis with CO 2 /steam reforming of methane, which improves greatly of liquid yields compared with pyrolysis simply in reactive atmosphere.…”

Section: Atmospherementioning

confidence: 99%

Pyrolysis of Low-Rank Coal: From Research to Practice

Nie¹,

Meng²,

Zhang³

2017

Pyrolysis

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Low-rank coal (LRC), as a conventional fossil fuel, has wealth of reserves and a wide range of distribution around the world, and pyrolysis is thought to be an easy way for clean and efficient conversion of LRC. In this chapter, the characteristics and world's reservation of LRC are introduced. Then, the chemical reactions and product formation process during pyrolysis of LRC are described. Meanwhile, how the factors, such as temperature, minerals in coal, heating rate, particle size and atmosphere, influence the pyrolysis process are discussed. Finally, three LRC pyrolysis-based polygeneration systems are illustrated for recent developments on LRC industrial practice.

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Section: Atmospherementioning

confidence: 99%

Pyrolysis of Low-Rank Coal: From Research to Practice

Nie¹,

Meng²,

Zhang³

2017

Pyrolysis

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“…However, rough and inefficient use of coal not only caused waste of the resource but also led to serious pollution. Coal pyrolysis, as a clean efficient utilization method for coal conversion process, has been extensively researched to achieve sustainable economic development. − Low-rank coal is greatly applicable for pyrolysis to generate tar, gas, and char due to its high content of volatile matter, good char reactivity, and noncaking properties . However, some undesirable features attributed to the high oxygen content and multiple chemical functionality, such as high moisture content, low calorific value, and relative instability, have resulted from the intrinsic complex chemical composition of low-rank coal. , Hence, revealing the intricate mechanism of the pyrolysis process requires a specific chemical emission profile of the products in detail.…”

Section: Introductionmentioning

confidence: 99%

In Situ Analysis of Catalytic Effect of Calcium Nitrate on Shenmu Coal Pyrolysis with Pyrolysis Vacuum Ultraviolet Photoionization Mass Spectrometry

Zhou

Jin

et al. 2018

Energy Fuels

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To investigate the effect of calcium mineral on the product distribution of low-rank coal pyrolysis, a Chinese subbituminous coal (Shenmu coal), and samples with 5% and 10% added calcium content, were selected to study with a homemade pyrolysis vacuum ultraviolet photoionization mass spectrometry (py-VUV-PIMS) system. In this system, secondary reactions of the pyrolysis products were generally inhibited because of in situ sampling, soft ionization, and high vacuum environment, which allowed direct detection of the initial pyrolytic products. Most evolved compounds during temperatureprogrammed heating from 30 to 650 °C were ionized by a VUV lamp (10.6 eV). The main products include five categories: alkenes, dienes, aromatics, phenols, and dihydroxy aromatics, which were formed via homolytic scission of weak bonds in side chains and bridges between aromatic nuclei in coal structure. The calcium mineral additives can dramatically affect pyrolytic product distribution, especially oxygen-containing compounds. The main reason is that calcium mineral plays a catalytic role in deoxygenation, which prompted incorporation of oxygen-containing compounds into corresponding aromatics, and resulted in the product of BTX levels increase significantly. The decrease in relative average molecular weight indicated the conversion of heavier components into lighter species, in terms of the observed m/z of the evolved gas components.

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“…Our previous studies found that the tar yield could be greatly improved when CO 2 reforming of methane (CRM) was coupled with traditional coal pyrolysis (CRMP). − The analyses showed that the active species, such as • CH x and • H, from activated methane take part in the formation of tar via combination of radicals from coal pyrolysis. As known, in coal tar upgrading, tar is also cracked into fragments or radicals, which provides a possibility to combine with the radicals, such as • CH x and • H, as in coal pyrolysis.…”

Section: Introductionmentioning

confidence: 99%

In Situ Catalytic Upgrading of Coal Pyrolysis Tar over Carbon-Based Catalysts Coupled with CO₂ Reforming of Methane

Wang

Jin

et al. 2017

Energy Fuels

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In situ catalytic upgrading of tar from the integrated process of CO2 reforming of methane with coal pyrolysis (CRMP) was investigated over carbon-based catalysts to increase the light tar yield. The results showed that the light tar (boiling point of <360 °C) content and light tar yield increase when char, modified char (MC), or activated carbon (AC) were used as the catalysts. The effectiveness of tar upgrading was closely related with the properties of carbon catalysts. In comparison to char or MC, AC showed a better catalytic effect in upgrading tar as a result of its higher disorder structure and specific surface area. In comparison to non-upgrading tar, a light tar content of above 88% was obtained and the light tar yield was increased by 45.0% on the AC catalyst at 650 °C. The contents of four light fractions increase, along with the obvious decrease of the content of pitch. Deuterium nuclear magnetic resonance (2H NMR) spectra analysis of the tar obtained by isotopic trace suggested that carbon-based catalysts in the upgrading process catalyze heavy tar cracking and CO2 reforming of methane reaction simultaneously, resulting in their interaction and the high content and yield of light tar. In addition, the AC catalyst amount and flow rates of CO2 and methane affect the tar upgrading.

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Isotope Analysis for Understanding the Tar Formation in the Integrated Process of Coal Pyrolysis with CO₂ Reforming of Methane

Cited by 35 publications

References 21 publications

Pyrolysis of Low-Rank Coal: From Research to Practice

Pyrolysis of Low-Rank Coal: From Research to Practice

In Situ Analysis of Catalytic Effect of Calcium Nitrate on Shenmu Coal Pyrolysis with Pyrolysis Vacuum Ultraviolet Photoionization Mass Spectrometry

In Situ Catalytic Upgrading of Coal Pyrolysis Tar over Carbon-Based Catalysts Coupled with CO₂ Reforming of Methane

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Isotope Analysis for Understanding the Tar Formation in the Integrated Process of Coal Pyrolysis with CO2 Reforming of Methane

Cited by 35 publications

References 21 publications

Pyrolysis of Low-Rank Coal: From Research to Practice

Pyrolysis of Low-Rank Coal: From Research to Practice

In Situ Analysis of Catalytic Effect of Calcium Nitrate on Shenmu Coal Pyrolysis with Pyrolysis Vacuum Ultraviolet Photoionization Mass Spectrometry

In Situ Catalytic Upgrading of Coal Pyrolysis Tar over Carbon-Based Catalysts Coupled with CO2 Reforming of Methane

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Product

Resources

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Isotope Analysis for Understanding the Tar Formation in the Integrated Process of Coal Pyrolysis with CO₂ Reforming of Methane

In Situ Catalytic Upgrading of Coal Pyrolysis Tar over Carbon-Based Catalysts Coupled with CO₂ Reforming of Methane