Reaction pathway for ethanol steam reforming on a Ni/SiO 2 catalyst including coke formation

Vicente, Jorge; Ereña, Javier; Montero, Carolina; Azkoiti, Miren J.; Bilbao, Javier; Gayubo, Ana G.

doi:10.1016/j.ijhydene.2014.09.073

Cited by 145 publications

(104 citation statements)

References 62 publications

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“…•h) −1 of Ni/SiO2 [57], indicating that their variation is in a reasonable range. The coke rates in Figure 7 (inset) show similar results with the literature [52], in which the coke rate varied in a range of 22.5~32.5 mg•(gcat.…”

Section: Thermogravimetric Analysis Of Spent Catalystsmentioning

confidence: 72%

Hydrogen Generation from Catalytic Steam Reforming of Acetic Acid by Ni/Attapulgite Catalysts

et al. 2016

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Abstract:In this research, catalytic steam reforming of acetic acid derived from the aqueous portion of bio-oil for hydrogen production was investigated using different Ni/ATC (Attapulgite Clay) catalysts prepared by precipitation, impregnation and mechanical blending methods. The fresh and reduced catalysts were characterized by XRD, N 2 adsorption-desorption, TEM and temperature program reduction (H 2 -TPR). The comprehensive results demonstrated that the interaction between active metallic Ni and ATC carrier was significantly improved in Ni/ATC catalyst prepared by precipitation method, from which the mean of Ni particle size was the smallest (~13 nm), resulting in the highest metal dispersion (7.5%). The catalytic performance of the catalysts was evaluated by the process of steam reforming of acetic acid in a fixed-bed reactor under atmospheric pressure at two different temperatures: 550 • C and 650 • C. The test results showed the Ni/ATC prepared by way of precipitation method (PM-Ni/ATC) achieved the highest H 2 yield of~82% and a little lower acetic acid conversion efficiency of~85% than that of Ni/ATC prepared by way of impregnation method (IM-Ni/ATC) (~95%). In addition, the deactivation catalysts after reaction for 4 h were analyzed by XRD, TGA-DTG and TEM, which demonstrated the catalyst deactivation was not caused by the amount of carbon deposition, but owed to the significant agglomeration and sintering of Ni particles in the carrier.

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Section: Thermogravimetric Analysis Of Spent Catalystsmentioning

confidence: 72%

Hydrogen Generation from Catalytic Steam Reforming of Acetic Acid by Ni/Attapulgite Catalysts

et al. 2016

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“…The ethanol conversion level (X EtOH ), the yield of H 2 (Y H2 ) and the products distribution of the carbon containing gas products (CH 4 , CO, CO 2 , C 2 H 4 , C 2 H 6 , CH 3 CHO and CH 3 COCH 3 ) were determined from [8]:…”

Section: Catalyst Performance In the Esrmentioning

confidence: 99%

“…The formation of acetaldehyde was attributed to the dehydrogenation of ethanol (CH 3 CH 2 OH → CH 3 CHO + H 2 ). According to the literatures [5,8,27], acetaldehyde was considered as an intermediate product in the ESR which can either decompose to CO and CH 4 through C−C bond breaking or transform to ethane and water by the cleavage of the C−O bond of acetaldehyde and addition of hydrogen. As temperature increased, the traces of ethylene and acetaldehyde were no longer detected, whereas the trace of ethane was still detected for the Ni/SP-IM catalyst throughout the whole range temperature studied.…”

mentioning

confidence: 99%

Investigation of Ni/SiO2 Fiber Catalysts Prepared by Different Methods on Hydrogen production from Ethanol Steam Reforming

et al. 2018

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Ni/SiO 2 (Ni/SF) catalysts were prepared by electrospinning of the SF followed by impregnation. The performance of the Ni/SF catalysts for hydrogen production from ethanol steam reforming at various conditions was investigated in comparison with a conventional Ni/silica porous (Ni/SP) catalyst. The influence of the Ni/SF catalyst preparation methods on the catalytic activity and stability in ethanol steam reforming was also studied. The catalysts were prepared by three different preparation techniques: impregnation (IM), deposition precipitation (DP) and strong electrostatic adsorption (SEA). The Ni/SF catalyst exhibited higher performances and stability than the Ni/SP catalyst. The H 2 yields of 55% and 47% were achieved at 600 • C using the Ni/SF and Ni/SP catalysts, respectively. The preparation methods had a significant effect on the catalytic activity and stability of the Ni/SF catalyst, where that prepared by the SEA method had a smaller Ni particle size and higher dispersion, and also exhibited the highest catalytic activity and stability compared to the Ni/SF catalysts prepared by IM and DP methods. The maximum H 2 yield produced from the catalyst prepared by SEA was 65%, while that from the catalysts prepared by DP and IM were 60% and 55%, respectively, under the same conditions. The activity of the fiber catalysts prepared by SEA, DP and IM remained almost constant at all times during a 16 h stability test.

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“…The carbon deposition on the three catalysts after SRA reaction for 4 h at 650 ℃ were investigated by TG-DTG and the results are displayed in Figure 6. It can be seen that significant weight losses happened over the three spent catalysts and the coke rates of them are larger than 5 mg·(gcat.·h) -1 of Ni/CeO2 [49] and lower than 75 mg·(gcat.·h) -1 of Ni/SiO2 [50], indicating that their variation in a reasonable range. The coke rates in Figure 6 (inset) show the similar results with the literature [46], in which the coke rate was vary in a range of 22.5 ~ 32.5 mg·(gcat.·h) -1 of Ni/Al2O3.…”

Section: Characterization Of Spent Catalysts At 650 ℃mentioning

confidence: 95%

Hydrogen Generation from Catalytic Steam Reforming Bio-Oil Model Compound—Acetic Acid Employing Ni/attapulgite Catalysts Prepared with Different Preparation Methods

Wang

Chen

Tian

et al. 2016

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Abstract:In this research, catalytic steam reforming acetic acid derived from the aqueous portion of bio-oil for hydrogen production was investigated by using different Ni/ATC (Attapulgite Clay) catalysts prepared by precipitation, impregnation and mechanical blending methods. The fresh and reduced catalysts were characterized by XRD, N2 adsorption-desorption, TEM and H2-TPR. The comprehensive results demonstrated that the interaction between active metallic Ni and ATC carrier was significantly improved in Ni/ATC catalyst prepared by precipitation method, and in which the mean Ni particle size was the smallest (~13 nm) resulted in the highest metal dispersion (7.5%). The catalytic performance of the three catalysts was evaluated through the process of steam reforming of acetic acid in a fixed-bed reactor under atmospheric pressure at two different temperatures, such as 550 ℃ and 650 ℃. Results showed that the Ni/ATC (PM-N/ATC) prepared by precipitation method, achieved the highest H2 yield of ~82% and little lower acetic acid conversion efficiency of ~85% than that (~95%) of Ni/ATC (IM-NATC) prepared by impregnation method. In addition, the deactivation catalysts after reaction for 4 h were analyzed by XRD, TGA-DTG and TEM, which demonstrated that the catalyst deactivation was not caused by the amount of carbon deposition, but owed to the significant agglomeration and sintering of Ni particles in the carrier.

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Reaction pathway for ethanol steam reforming on a Ni/SiO 2 catalyst including coke formation

Cited by 145 publications

References 62 publications

Hydrogen Generation from Catalytic Steam Reforming of Acetic Acid by Ni/Attapulgite Catalysts

Hydrogen Generation from Catalytic Steam Reforming of Acetic Acid by Ni/Attapulgite Catalysts

Investigation of Ni/SiO2 Fiber Catalysts Prepared by Different Methods on Hydrogen production from Ethanol Steam Reforming

Hydrogen Generation from Catalytic Steam Reforming Bio-Oil Model Compound—Acetic Acid Employing Ni/attapulgite Catalysts Prepared with Different Preparation Methods

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Reaction pathway for ethanol steam reforming on a Ni/SiO 2 catalyst including coke formation

Cited by 145 publications

References 62 publications

Hydrogen Generation from Catalytic Steam Reforming of Acetic Acid by Ni/Attapulgite Catalysts

Hydrogen Generation from Catalytic Steam Reforming of Acetic Acid by Ni/Attapulgite Catalysts

Investigation of Ni/SiO2 Fiber Catalysts Prepared by Different Methods on Hydrogen production from Ethanol Steam Reforming

Hydrogen Generation from Catalytic Steam Reforming Bio-Oil Model Compound&mdash;Acetic Acid Employing Ni/attapulgite Catalysts Prepared with Different Preparation Methods

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Hydrogen Generation from Catalytic Steam Reforming Bio-Oil Model Compound—Acetic Acid Employing Ni/attapulgite Catalysts Prepared with Different Preparation Methods