Integrated coal pyrolysis with CO2 reforming of methane over Ni/MgO catalyst for improving tar yield

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

doi:10.1016/j.fuproc.2009.05.003

Cited by 69 publications

(41 citation statements)

References 21 publications

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“…It was also found that H 2 production at 800 °C increased rapidly compared with CO production. Gas reforming began to occur and enhanced H 2 and CO production [17]. Based on the gas reforming stoichiometry, the mole of H 2 was higher than CO in the gas reforming products.…”

Section: Effect Of Pyrolysis Temperaturementioning

confidence: 99%

Optimum temperatures for carbon deposition during integrated coal pyrolysis–tar decomposition over low-grade iron ore for ironmaking applications

Cahyono

Yasuda

Nomura

et al. 2014

Fuel Processing Technology

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Carbon deposited within low-grade iron ore, which was produced using an integrated process of coal pyrolysis and tar decomposition, showed high reactivity as a reducing agent. Coal pyrolysis and tar decomposition were both highly sensitive to temperature and exhibited contrasting behaviours during carbon deposition. In these experiments, the optimum temperatures for pyrolysis and tar decomposition were determined to obtain maximum carbon deposition within porous iron ore. High-temperature pyrolysis generated large amounts of volatile matter (tar and gases), which caused high tar decomposition and produced large amounts of deposited carbon and gases. The deposited carbon was the major product of tar decomposition at lower temperatures (400-600 °C), whereas mainly gases were produced at higher temperatures (700-800 °C), because of gasification of carbon. However, sintering started at 800 °C, and it significantly diminished the BET surface area and pore size distribution. The highest amount of deposited carbon was obtained at a pyrolysis temperature of 800 °C and a tar decomposition temperature of 600 °C. Hamersley ore gave higher amounts of deposited carbon than Robe-river ore because of its large pore size less than 4 nm, which was suitable for carbon deposition. The pore size distribution was a more important factor than the surface area in the carbon deposition process. Based on these results, the proposed system could achieve maximum carbon deposition in porous iron ore and solve problems related to reducing agents, tar materials, and the use of expensive raw materials in the ironmaking industry.

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Section: Effect Of Pyrolysis Temperaturementioning

confidence: 99%

Optimum temperatures for carbon deposition during integrated coal pyrolysis–tar decomposition over low-grade iron ore for ironmaking applications

Cahyono

Yasuda

Nomura

et al. 2014

Fuel Processing Technology

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“…It is well-known that the CO 2 reforming reaction on the nickel catalyst begins with the dissociation of CH 4 followed by adsorption onto the surface of the active catalyst. CH 4 is dehydrogenated and dissociated into activated H and CH x radicals [20,22].…”

Section: Effect Of Different Gaseous Atmospheresmentioning

confidence: 99%

“…Liu et al [20] [4] put forward a new process to integrate methane aromatization over a Mo/HZSM-5 catalyst to improve the tar yield from coal pyrolysis. It was found that the tar yield was 21.5 wt % under the optimum conditions, which was much higher than that obtained under N 2 and H 2 atmospheres.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Pyrolysis of Bituminous Coal under Pyrolysis Gas over a Ni/MgO Catalyst

Zhu

Zhang

et al. 2017

Chem Eng & Technol

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To improve the yield and quality of coal pyrolysis tar while using pyrolysis gas (PG), a Ni/MgO catalyst was introduced to catalyze the pyrolysis of bituminous coal under a PG atmosphere. The effects of pyrolysis temperature, gas flow rate, catalyst packing methods, and atmosphere composition on coal pyrolysis were investigated. The yield and quality of tar obtained from Shihezi (SHZ) bituminous coal pyrolysis under N 2 , PG, and PG over a Ni/MgO catalyst were found to vary with the increase of pyrolysis temperature. The catalyst packed in the upper layer results in higher tar yields, but mixing the catalyst and coal leads to an increase in the maltene yield. The components in PG improved the tar yield and tar quality. Finally, a higher tar yield can be obtained from SHZ coal pyrolysis under CO/H 2 , CO 2 /H 2 , and CO 2 /CH 4 atmospheres using a Ni/MgO catalyst.

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“…The transition metal of nickel or its chemical compounds have been found in relatively higher activity [5][6][7] in the processes of coal utilization. CeO 2 , MgO, and ZrO 2 were used as support or promoter to overcome the problems of coking and aggregation of the nickel catalysts [8,9]. The CeO 2 modifier contributes to stabilizing the catalyst by avoiding sintering of the catalyst metals [10].…”

Section: Introductionmentioning

confidence: 99%

“…The CeO 2 modifier contributes to stabilizing the catalyst by avoiding sintering of the catalyst metals [10]. MgO and ZrO 2 with low Lewis base concentration can promote the adsorption of CO 2 on the catalyst surface and, consequently, enhance the conversion between CO 2 and carbon, thereby inhibiting the formation of coke [5,8]. Moreover, CeO 2 and ZrO 2 are active in decomposing petroleum residual oils with steam [11], which favors the production of active oxygen and hydrogen species from H 2 O.…”

Section: Introductionmentioning

confidence: 99%

Coal Pyrolysis in a Laboratory‐Scale Two‐Stage Reactor: Catalytic Upgrading of Pyrolytic Vapors

Gong¹,

Wang²,

Li³

et al. 2014

Chem Eng & Technol

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In situ upgrading of coal pyrolysis vapors over Ce/Zr/Ni and Ce/Zr/Ni/Zn catalysts was studied in a two-stage reactor. The catalytic effects of Ce/Zr/Ni and Ce/Zr/Ni/Zn on the pyrolysis products were examined, revealing that CO 2 , CO, and H 2 were dramatically increased and pyrolytic water was decreased when using these catalysts. The tar collected in the cooling traps showed a slight increase after catalysis. Compared to the no-catalyst condition, heterocyclic compounds and multicyclic aromatic hydrocarbons in the tar were significantly reduced, and benzene derivatives and aliphatics were increased. The molar ratio of H/C in tar was analyzed to further evaluate the tar quality. Possible reaction routes are proposed.

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Integrated coal pyrolysis with CO2 reforming of methane over Ni/MgO catalyst for improving tar yield

Cited by 69 publications

References 21 publications

Optimum temperatures for carbon deposition during integrated coal pyrolysis–tar decomposition over low-grade iron ore for ironmaking applications

Optimum temperatures for carbon deposition during integrated coal pyrolysis–tar decomposition over low-grade iron ore for ironmaking applications

Catalytic Pyrolysis of Bituminous Coal under Pyrolysis Gas over a Ni/MgO Catalyst

Coal Pyrolysis in a Laboratory‐Scale Two‐Stage Reactor: Catalytic Upgrading of Pyrolytic Vapors

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