Promotional Effect of Ce-dopant on Al2O3-supported Co Catalysts for Syngas Production via CO2 Reforming of Ethanol

Fayaz, Fahim; Danh, Huong T.; Nguyen‐Huy, Chinh; Vu, Khanh B.; Abdullah, Bawadi; Vo, Dai‐Viet N.

doi:10.1016/j.proeng.2016.06.530

Cited by 42 publications

(15 citation statements)

References 19 publications

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“…Consistent with reducibility of catalysts, the dry reforming activity of ethanol followed the order of 3%La-10%Co/Al2O3 > 10%Co/Al2O3 > 3%Ce-10%Co/Al2O3. The relationship indicated that the La and Ce can promote the amount of Co active sites by accelerating the reduction Co based catalysts promoted by Ce and La have also been proposed for the dry reforming of ethanol [30][31][32]. The addition of Ce and La facilitated the reduction of Co 3 O 4 to CoO, which can be further transformed into Co.…”

Section: Dry Reforming Of Ethanolmentioning

confidence: 99%

“…Co based catalysts promoted by Ce and La have also been proposed for the dry reforming of ethanol [30][31][32]. The addition of Ce and La facilitated the reduction of Co3O4 to CoO, which can be further transformed into Co.…”

Section: Dry Reforming Of Ethanolmentioning

confidence: 99%

“…The dry reforming of glycerol is expected to follow a similar pattern to that of ethanol. Theoretically, 3 mol of H 2 and 4 mol of CO can be extracted from 1 mol of dry reforming of glycerol according to Equation (31). However, direct decomposition of glycerol may also occur following the overall reaction as shown in Equation (32) along with methanation and (reverse) WGSRs.…”

Section: Dry Reforming Of Glycerolmentioning

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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Section: Dry Reforming Of Ethanolmentioning

confidence: 99%

Section: Dry Reforming Of Ethanolmentioning

confidence: 99%

Section: Dry Reforming Of Glycerolmentioning

confidence: 99%

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Dry Reforming of Ethanol and Glycerol: Mini-Review

Odriozola

Reina

2019

Catalysts

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“…The first (P1) and second (P2) peaks were attributed to the reduction of Co3O4 to CoO phase and the subsequent conversion of the CoO intermediate phase to the final metallic Co 0 form, respectively [20]. The high temperature peak (P3) at about 950 K was also ascribed to the reduction of CoAl2O4 phase possessing strong metal-support interaction to metallic Co 0 phase [21]. Noticeably, the reduction temperature of peak P1 was shifted towards lower temperature of about 51 K with Lapromotion indicating that the transformation of Co3O4 to CoO phase was more facile with La-addition.…”

Section: H2 Temperature-programmed Reductionmentioning

confidence: 99%

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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“…In general, ethanol dry reforming (EDR; cf. Equation ), theoretically yields syngas possessing H 2 /CO ratio = 1, favored for downstream FTS in terms of long‐chain hydrocarbon production

C_{2} H_{5} italicOH + {CO}_{2} \to 3 H_{2} + 3 italicCO (();, Δ G_{rxn} = 310.59 - 0.52 normalT italickJ {mol}^{- 1}, normalT : K)

As an endothermic reaction, EDR normally requires catalysts that can endure high temperature and resist to deposited carbon, apart from outstanding activity, stability, and H 2 selectivity.…”

Section: Introductionmentioning

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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Promotional Effect of Ce-dopant on Al2O3-supported Co Catalysts for Syngas Production via CO2 Reforming of Ethanol

Cited by 42 publications

References 19 publications

Dry Reforming of Ethanol and Glycerol: Mini-Review

Dry Reforming of Ethanol and Glycerol: Mini-Review

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

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

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