Hydrogen production by the partial oxidation and steam reforming of tar from hot coke oven gas

Onozaki, Masaki; Watanabe, Kei; Hashimoto, Takao; Hitoshi, Saegusa; Katayama, Yoshinori

doi:10.1016/j.fuel.2005.02.028

Cited by 109 publications

(67 citation statements)

References 2 publications

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“…(11), (15) and (16), respectively, may be the driving force for the high NH 3 decomposition performance with 5% CO 2 , 5% H 2 O or 5% CO 2 /5% H 2 O coexisted to 50% H 2 /30% CH 4 /5% CO. Similar results have been reported for NH 3 decomposition by limonite in a simulated air-blown coal gasification composition (10% CO 2 or 3% H 2 O coexisted in 20% CO/10% H 2 ). Figure 6 shows the XRD results for the catalysts after NH 3 decomposition in each gas composition, and these results are summarized in Table 4.…”

Section: Decomposition Of Ammonia In the Presence Ofsupporting

confidence: 88%

“…1) On the other hand, the catalytic or noncatalytic reforming of COG is a promising technology that effectively utilizes the energy of the hot COG. [2][3][4][5] Upon coal carbonization, some of the nitrogen and sulfur present in coal are retained in the solid phase, and the rest is released as volatile-N (N 2 , NH 3 , HCN and tar-N) and -S (H 2 S, COS, CS 2 and tar-S) species.…”

Section: Introductionmentioning

confidence: 99%

“…6) It is well known that NH 3 , HCN, tar-N, H 2 S, organic-S and tar-S not only serve as sources of NO x and SO x but also are catalyst poison materials used for COG reforming and/or gas tube corrosion.…”

Section: Introductionmentioning

confidence: 99%

“…When such a composite is used for blast furnaces, the N and S species in the composite may have adverse effects on the reduction rate, strength or exhaust gas purification equipment. N and S in COG mainly exist as NH 3 and H 2 S, with contents of approximately 1 vol% and 3 000 ppmv, respectively. Therefore, it is very important to develop a removal method for gaseous-N and -S species in COG.…”

Section: Introductionmentioning

confidence: 99%

“…Our research group has been investigating the catalytic decomposition of NH 3 or model tar-N compounds (pyridine or pyrrole) using inexpensive iron catalysts. [8][9][10][11][12][13][14][15][16][17][18] We have found that fine particles of metallic iron (α-Fe) formed from low-value iron ore (limonite) give high activity in the decomposition of NH 3 and model tar-N compounds.…”

Section: Introductionmentioning

confidence: 99%

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Removal of Hydrogen Sulfide and Ammonia by Goethite-Rich Limonite in the Coexistence of Coke Oven Gas Components

2017

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Hydrogen sulfide (H 2 S) removal and catalytic ammonia (NH 3 ) decomposition performance of limonite in the presence of coke oven gas (COG) components has been studied in a cylindrical quartz reactor at 300-850°C under a high space velocity of 51 000 h − 1 to develop a novel hot gas cleanup method. The H 2 S removal behavior in 50% H 2 /He depends on the temperature, with high performance observed at lower temperature. An investigation of the removal behavior of H 2 S in the presence of COG components (CH 4 , CO, CO 2 and H 2 O) at 400°C reveals that CH 4 does not affect the removal performance. On the other hand, the coexistence of CO drastically decreases the H 2 S removal performance. However, the addition of 5% H 2 O to 50% H 2 /30% CH 4 /5% CO/He dramatically improves the H 2 S removal performance, whereas the performance is low at 5% CO 2 with 50% H 2 /30% CH 4 /5% CO/He. In addition, the H 2 S breakthrough curve strongly depends on the space velocity.The limonite catalyst achieves almost complete decomposition of NH 3 in He at 850°C until 240 min. When the decomposition run is performed in the presence of COG components, the coexistence of 30% CH 4 deactivates limonite with significant formation of deposited carbon. On the other hand, the addition of 5% CO 2 , 5% H 2 O or 5% CO 2 /5% H 2 O to 50% H 2 /30% CH 4 /5% CO improves the catalytic activity without carbon deposition, and > 99% conversion of NH 3 to N 2 is maintained until 240 min.

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Section: Decomposition Of Ammonia In the Presence Ofsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Removal of Hydrogen Sulfide and Ammonia by Goethite-Rich Limonite in the Coexistence of Coke Oven Gas Components

2017

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A novel dynamic membrane reactor concept with radial‐flow pattern for reacting material and axial‐flow pattern for sweeping gas in catalytic naphtha reformers

et al. 2011

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Naphtha reforming units are of high interest for hydrogen production in refineries. In this regard, the application of membrane concept in radial‐flow tubular naphtha reactors for hydrogen production is proposed. Because of the importance of the pressure drop problem in catalytic naphtha reforming units, the radial‐flow reactors are proposed. A radial‐flow tubular membrane reactor (RF‐TMR) with the radial‐flow pattern of the naphtha feed and the axial‐flow pattern of the sweeping gas is proposed as an alternative configuration for conventional axial‐flow tubular reactors (AF‐TR). The cross‐sectional area of the tubular reactor is divided into some subsections in which walls of the gaps between subsections are coated with the Pd‐Ag membrane layer. A dynamic mathematical model considering radial and axial coordinates ((r, z)‐coordinates) has been developed to investigate the performance of the new configuration. Results show ∼300 and 11 kg/h increase in aromatic and hydrogen production rates in RF‐TMR compared with AF‐TR, respectively. Furthermore, smaller catalyst particles with higher efficiency can be used in RF‐TMR due to a slight pressure drop. The enhancement in aromatics (octane number) and hydrogen productions owing to applying simultaneously the membrane concept and radial‐flow pattern in naphtha reactors motivates the application of RF‐TMR in refineries. © 2011 American Institute of Chemical Engineers AIChE J, 2012

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Preparation and performance of Ni‐based catalysts supported on Ca₁₂Al₁₄O₃₃ for steam reforming of tar in coke oven gas

Xie

Zhang

et al. 2016

Env Prog and Sustain Energy

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The catalytic activities of the Ni‐based catalysts with Ca12Al14O33 as carrier for the steam reforming of tar from coke oven gas were studied. The carriers were prepared with three methods, high temperature roasting (HTR), coprecipitation (CP) and sol−gel (SG), respectively. Compared to the catalyst with CP, the catalyst with HTR showed stronger peaks of NiO as well as Ca12Al14O33, similar to the one with SG, and had obviously higher catalytic activity than those with CP and especially with Al2O3 as carrier, just slightly lower than that with SG. When the calcination temperature was 1350°C (HTR‐1350), the prepared catalyst showed the strongest peaks of Ca12Al14O33 and NiO and the highest surface area, resulting in the excellent performance for tar reforming. For Ni/Mg−Ca12Al14O33 catalyst with HTR‐1350, the catalytic activity and stability were improved as the reforming temperature and the steam/carbon ratio (S/C) rose, and especially at 850°C and the S/C ratio of 12:1, the hydrogen yield can reach 93.16%, with the carbon conversion reaching 97.14%. © 2016 American Institute of Chemical Engineers Environ Prog, 36: 729–735, 2017

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Hydrogen production by the partial oxidation and steam reforming of tar from hot coke oven gas

Cited by 109 publications

References 2 publications

Removal of Hydrogen Sulfide and Ammonia by Goethite-Rich Limonite in the Coexistence of Coke Oven Gas Components

Removal of Hydrogen Sulfide and Ammonia by Goethite-Rich Limonite in the Coexistence of Coke Oven Gas Components

A novel dynamic membrane reactor concept with radial‐flow pattern for reacting material and axial‐flow pattern for sweeping gas in catalytic naphtha reformers

Preparation and performance of Ni‐based catalysts supported on Ca₁₂Al₁₄O₃₃ for steam reforming of tar in coke oven gas

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Hydrogen production by the partial oxidation and steam reforming of tar from hot coke oven gas

Cited by 109 publications

References 2 publications

Removal of Hydrogen Sulfide and Ammonia by Goethite-Rich Limonite in the Coexistence of Coke Oven Gas Components

Removal of Hydrogen Sulfide and Ammonia by Goethite-Rich Limonite in the Coexistence of Coke Oven Gas Components

A novel dynamic membrane reactor concept with radial‐flow pattern for reacting material and axial‐flow pattern for sweeping gas in catalytic naphtha reformers

Preparation and performance of Ni‐based catalysts supported on Ca12Al14O33 for steam reforming of tar in coke oven gas

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Preparation and performance of Ni‐based catalysts supported on Ca₁₂Al₁₄O₃₃ for steam reforming of tar in coke oven gas