Efficient hydrogen production from ethanol steam reforming over La-modified ordered mesoporous Ni-based catalysts

Ma, Hongyan; Zeng, Liang; Tian, Hao; Li, Di; Wang, Xiao; Li, Xinyu; Gong, Jinlong

doi:10.1016/j.apcatb.2015.08.019

Cited by 216 publications

(81 citation statements)

References 91 publications

(107 reference statements)

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“…According to the previous literature [51,52], the reduction behavior of pure NiO typically showed a single H2 consumption peak at around 673 K. The reduction of nickel species with strong interaction with the oxide support was significantly hindered, producing higher reduction temperatures than pure NiO [16,17,34,46]. For natural ATC, there is an obvious reduction peak starting at 500 °C and centered around 750 °C, as displayed in Figure 4.…”

Section: H2-tpr Test Of Fresh Catalystsmentioning

confidence: 98%

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: H2-tpr Test Of Fresh Catalystsmentioning

confidence: 98%

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

et al. 2016

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“…The first reduction peak was assigned to the reduction of NiO with large particle sizes or those with a weak interaction with the support. The second and the third peaks were the reduction of NiO with either small metal particles or those with a strong interaction with the support [23]. As for the Ni/SF-SEA catalyst, there were two reduction peaks and both were shifted towards a higher temperature compared to the Ni/SF-IM and Ni/SF-DP catalysts.…”

mentioning

confidence: 91%

“…Additionally, as shown in the stability test (Figure 7 inset), the Ni/SF-SEA catalyst exhibited much higher stability as compared to other catalysts. The main cause of catalyst deactivation in the ESR is reported to be the formation of carbon and sintering on the catalyst [23], and this was evaluated and discussed in section characterization of the spent catalysts. …”

Section: Stability Testmentioning

confidence: 99%

“…After that, the temperature was cooled down to room temperature and the chemisorption was carried out by pulsing of a 10% H 2 /Ar. The active surface area of Ni was calculated from the volume of H 2 adsorbed by assuming the stoichiometric ratio H adsorbed /Ni surface of 1 and a density of active sites on the surface of 1.54 × 10 −19 atoms/m 2 [23]. Field emission scanning electron microscopy (FESEM) were performed with a JSM-7610F model microscope to obtain images of the morphology of all catalysts, along with transmission electron microscopy (TEM) using a FEI Tecnai G2 20 TEM/STEM/EDX to examine the catalyst particle sizes.…”

Section: Characterization Of the Catalystsmentioning

confidence: 99%

“…According to Ma et al [23], large metal particles were favorable for the Boudouard reaction and methane decomposition that accounted for the large amount of accumulated carbon. The high nickel dispersion and strong metal−support interaction effectively suppressed metal aggregation which could help to reduce carbon deposition, therefore enhancing the stability of the nickel catalyst.…”

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confidence: 99%

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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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Promotional role of MgO on sorption‐enhanced steam reforming of ethanol over Ni/CaO catalysts

et al. 2019

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This article describes the design and synthesis of MgO‐modified Ni/CaO catalysts for sorption‐enhanced steam reforming of ethanol. The results show that the introduction of MgO effectively increases the dispersion of CaO via forming MgCa(CO3)2 precursor. In the prepared MgO‐modified Ni/CaO catalysts, metallic Ni exists around MgO supported on CaO. Both 100% ethanol conversion and >96% hydrogen purity can be stabilized in 10 cycles over the catalyst containing 20 wt% MgO. The interaction between metallic Ni and MgO enhances the sintering resistance of the catalyst. More importantly, reaction pathway studies have confirmed that the formation of CaCO3 hinders the activation of H2O on the Ni/CaO catalyst surface, and thus inhibits the conversion of the reaction intermediates including HCO* and CH x*. MgO can dissociate H2O to form hydroxyl groups which participate in the conversion of the reaction intermediates, thereby the MgO‐modified Ni/CaO catalysts have better catalytic performance and carbon deposition resistance.

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Efficient hydrogen production from ethanol steam reforming over La-modified ordered mesoporous Ni-based catalysts

Cited by 216 publications

References 91 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

Promotional role of MgO on sorption‐enhanced steam reforming of ethanol over Ni/CaO catalysts

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