Ethanol dry reforming for syngas production over Ce-promoted Ni/Al2O3 catalyst

Bahari, Mahadi B.; Phuc, Nguyen Huu Huy; Abdullah, Bawadi; Alenazey, Feraih; Vo, Dai‐Viet N.

doi:10.1016/j.jece.2016.01.038

Cited by 65 publications

(23 citation statements)

References 38 publications

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“…In addition, Jankhah et al studied the thermodynamics of EDR and reported that catalytic performance was favored at high ratio of CO2 to C2H5OH [24]. This observation was in agreement with other studies about EDR using Ni-based catalysts [25]. Interestingly, regardless of CO2 partial pressure, the La-promoted catalyst exhibited higher C2H5OH and CO2 conversions up to about 74.22% and 33.80%, respectively than those of unpromoted catalyst rationally due to the high oxygen storage capacity of La2O3 promoter oxidizing deposited carbon [3,26] and the enhancement of metal dispersion with La-promotion (Table 2).…”

Section: Ethanol Dry Reforming Evaluation 41 Effect Of Co2 Partial Psupporting

confidence: 81%

HYDROGEN PRODUCTION FROM ETHANOL DRY REFORMING OVER LANTHANIA-PROMOTED Co/Al2O3 CATALYST

Fayaz

Nga

Pham

et al. 2018

IIUMEJ

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La-promoted and unpromoted 10%Co/Al2O3 catalysts were synthesized using wet a impregnation method and evaluated in a quartz fixed-bed reactor at different CO2:C2H5OH ratios of 2.5:1-1:2.5 and a reaction temperature of 973 K under atmospheric pressure. X-ray diffraction measurements detected the presence of Co3O4 and CoAl2O4 phases on the surface of both promoted and unpromoted catalysts. BET surface area of promoted and unpromoted 10%Co/Al2O3 catalysts was about 143.09 and 136.04 m2.g-1, respectively. The La promoter facilitated Co3O4 reduction, improved the degree of reduction from 86 to 98% and increased metal dispersion from 9.11% to 16.64%. The La-promoted catalyst appeared to be a better catalyst in terms of catalytic activity and product yield regardless of reactant partial pressure. Both C2H5OH and CO2 conversions improved significantly with an increase in CO2 partial pressure from 20 to 50 kPa for both catalysts whilst a decline in catalytic performance was observed with rising C2H5OH partial pressure. La addition improved C2H5OH and CO2 conversions up to about 74.22% and 33.80%, respectively. ABSTRAK: Penggalak-La dan bukan penggalak-La mangkin 10%Co/Al2O3 dihasilkan menggunakan kaedah impregnasi basah dan dinilai dalam reaktor alas-tetap quarza pada pelbagai nisbah CO2:C2H5OH sebanyak 2.5:1-1:2.5 dan suhu tindak balas sebanyak 973 K di bawah tekanan atmosfera. Hasil daripada ukuran pembelauan X-ray, didapati terdapat kehadiran fasa Co3O4 dan CoAl2O4 pada permukaan kedua-dua mangkin penggalak dan bukan penggalak. Permukaan kawasan BET pada penggalak dan bukan penggalak mangkin 10%Co/Al2O3 adalah masing-masing sebanyak 143.09 dan 136.04 m2.g-1. Penggalak-La membantu dalam pengurangan Co3O4,membaiki peratus penurunan daripada 86 kepada 98% dan menambah penyebaran logam daripada 9.11% kepada 16.64%. Mangkin penggalak-La dilihat sebagai mangkin terbaik dari segi aktiviti pemangkinan dan hasil pengeluaran, biarpun pada tekanan separa reaktan. Kedua-dua penukaran C2H5OH dan CO2 meningkat dengan ketara dengan kenaikan separa tekanan CO2 daripada 20 kepada 50 kPa bagi kedua-dua pemangkin, sementara penurunan dalam aktiviti pemangkinan dilihat dengan kenaikan tekanan separa C2H5OH. Penambahan La meningkatkan penukaran C2H5OH dan CO2, masing-masing sebanyak 74.22% dan 33.80%.

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Section: Ethanol Dry Reforming Evaluation 41 Effect Of Co2 Partial Psupporting

confidence: 81%

HYDROGEN PRODUCTION FROM ETHANOL DRY REFORMING OVER LANTHANIA-PROMOTED Co/Al2O3 CATALYST

Fayaz

Nga

Pham

et al. 2018

IIUMEJ

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“…According to the thermodynamics, a two-step reaction mechanism was then proposed for the dry reforming of ethanol. Initially, ethanol was directly decomposed into methane and acetaldehyde intermediates, which can be subsequently reformed to syngas [19,20]. Moreover, H 2 O was predicted due to the reversed WGSR.…”

Section: Dry Reforming Of Ethanolmentioning

confidence: 99%

“…To optimize the performance of Ni based catalysts, promoters such as La and Ce were also incorporated [11,19,29]. The advanced redox properties of Ce resulted in great benefits for a Ce-Ni/Al 2 O 3 tested in the dry reforming of ethanol.…”

Section: Dry Reforming Of Ethanolmentioning

confidence: 99%

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Dry Reforming of Ethanol and Glycerol: Mini-Review

Odriozola

Reina

2019

Catalysts

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Dry reforming of ethanol and glycerol using CO2 are promising technologies for H2 production while mitigating CO2 emission. Current studies mainly focused on steam reforming technology, while dry reforming has been typically less studied. Nevertheless, the urgent problem of CO2 emissions directly linked to global warming has sparked a renewed interest on the catalysis community to pursue dry reforming routes. Indeed, dry reforming represents a straightforward route to utilize CO2 while producing added value products such as syngas or hydrogen. In the absence of catalysts, the direct decomposition for H2 production is less efficient. In this mini-review, ethanol and glycerol dry reforming processes have been discussed including their mechanistic aspects and strategies for catalysts successful design. The effect of support and promoters is addressed for better elucidating the catalytic mechanism of dry reforming of ethanol and glycerol. Activity and stability of state-of-the-art catalysts are comprehensively discussed in this review along with challenges and future opportunities to further develop the dry reforming routes as viable CO2 utilization alternatives.

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“…The lowest CH 4 yield amongst gaseous product yields could imply the successful conversion of ethanol to syngas. Indeed, CH 4 intermediate could subsequently react with CO 2 via secondary methane dry reforming to form syngas during EDR, thereby reducing undesirable methane formation rate. Both catalysts showed fairly unchanged H 2 /CO values beyond 10 h on‐stream (see Figure ).…”

Section: Resultsmentioning

confidence: 99%

Stability evaluation of ethanol dry reforming on Lanthania‐doped cobalt‐based catalysts for hydrogen‐rich syngas generation

et al. 2018

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Summary Catalytic stability with time‐on‐stream is an important aspect in ethanol dry reforming (EDR) since catalysts could encounter undesirable deterioration arising from deposited carbon. This work examined the promotional effect of La on 10%Co/Al2O3 in terms of activity, stability, and characteristics. Catalysts were characterized by X‐ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), Raman, and X‐ray photoelectron spectroscopy (XPS) measurements whilst catalytic EDR performance of La‐promoted and unpromoted 10%Co/Al2O3 prepared via wet impregnation technique was investigated at 973 K for 72 h using a stoichiometric feed ratio (C2H5OH/CO2 = 1/1). La promoter substantially enhanced both metal dispersion and metal surface area from 0.11% to 0.64% and 0.08 to 0.43 m2 g−1, respectively. Ethanol and CO2 conversions appeared to be stable within 50 to 72 h after experiencing an initial activity drop. The conversion of C2H5OH and CO2 for La‐promoted catalyst was about 1.65 and 1.34 times greater than unpromoted counterpart in this order. The carbonaceous deposition was considerably decreased from 55.6% to 36.8% with La promotion due to La2O2CO3 intermediate formation. Additionally, 3%La‐10%Co/Al2O3 possessed greater oxygen vacancies acting as active sites for CO2 adsorption and hence increasing carbon gasification. Even though graphitic and filamentous carbons were formed on used catalyst surface, La‐addition diminished graphite formation and increased the reactiveness of amorphous carbon.

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Ethanol dry reforming for syngas production over Ce-promoted Ni/Al2O3 catalyst

Cited by 65 publications

References 38 publications

HYDROGEN PRODUCTION FROM ETHANOL DRY REFORMING OVER LANTHANIA-PROMOTED Co/Al2O3 CATALYST

HYDROGEN PRODUCTION FROM ETHANOL DRY REFORMING OVER LANTHANIA-PROMOTED Co/Al2O3 CATALYST

Dry Reforming of Ethanol and Glycerol: Mini-Review

Stability evaluation of ethanol dry reforming on Lanthania‐doped cobalt‐based catalysts for hydrogen‐rich syngas generation

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