Hydrogen production from chemical looping steam reforming of glycerol by Ni-based oxygen carrier in a fixed-bed reactor

Jiang, Bo; Dou, Binlin; Song, Yongchen; Zhang, Chuan; Du, Baoguo; Chen, Haisheng; Wang, Chao; Xu, Yujie

doi:10.1016/j.cej.2015.05.120

Cited by 90 publications

(33 citation statements)

References 27 publications

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“…The activity and stability tests of OCs in CLR of glycerol were evaluated in a down-flow fixed-bed reactor (diameter 12 mm) operating at 650°C and ambient pressure. The experimental methods and relevant calculations have been reported in our previous studies [4,13].…”

Section: Characterization and Activity Testsmentioning

confidence: 99%

“…This is achieved by circulating the oxygen carrier (OC) between a reformer, in which the OC contacts with fuel, and a regenerator, in which the OC and coke deposited are oxidized by air [3]. We recently demonstrated renewable H 2 generation from glycerol via CLR, which was carried out by Nibased OCs [4]. The autothermal and continuous hydrogen production by CLR in a moving-bed reactor has been investigated in our previous study [5].…”

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confidence: 97%

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Hydrogen production from chemical looping steam reforming of glycerol by Ni based Al-MCM-41 oxygen carriers in a fixed-bed reactor

Jiang

Dou

Wang

et al. 2016

Fuel

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Section: Characterization and Activity Testsmentioning

confidence: 99%

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confidence: 97%

Hydrogen production from chemical looping steam reforming of glycerol by Ni based Al-MCM-41 oxygen carriers in a fixed-bed reactor

Jiang

Dou

Wang

et al. 2016

Fuel

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“…Different Nibased catalysts were used for this process. In addition, Dou et al [11] also integrated the reduction of the catalyst into the same process by enhanced-sorption chemical looping of glycerol [12] .…”

Section: Introductionmentioning

confidence: 99%

Analysis and optimisation of H2 production from crude glycerol by steam reforming using a novel two step process

Remón

Jarauta-Córdoba

García

et al. 2016

Fuel Processing Technology

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This work studies the valorisation of biodiesel-derived glycerol to produce a hydrogen rich gas by means of a two-step sequential process. Firstly, the crude glycerol was purified with acetic acid to reduce problematical impurities. The effect of the final pH (5-7) on the neutralisation process was addressed and it was found that a pH of 6 provided the best phase separation and the greatest glycerol purity. Secondly, the refined glycerol was upgraded by catalytic steam reforming and this step was theoretically and experimentally studied. The theoretical study analyses the effect of the temperature (400-700 ºC), glycerol concentration (10-50 wt.%) and N 2 (225-1347 cm 3 STP/min) and liquid flow (0.5-1 mL/min) rates on the thermodynamic composition of the gas. The results show that the temperature and glycerol concentration exerted the greatest influence on the thermodynamics. The experimental study considers the effect of the temperature (400-700 ºC), glycerol concentration (10-50 wt.%) and spatial time (3-17 g catalyst min/ g glycerol) on the product distribution in carbon basis (gas, liquid and solid) and on the composition of the gas and liquid phases. The experiments were planned according to a 2 level 3 factor Box-Wilson Central Composite Face Centred (CCF, :  1) design, which is suitable for studying the influence of each variable as well as all the possible interactions between variables. The results were analysed with an analysis of variance (ANOVA) with 95% confidence, enabling the optimisation of 2 the process. The gas phase was made up of a mixture of H 2 (65-95 vol.%), CO 2 (2-29 vol.%), CO (0-18 vol.%) and CH 4 (0-5 vol.%). Temperatures of 550 ºC and above enabled thermodynamic compositions for the gas to be achieved and helped diminish carbon formation. A possible optimum for H 2 production was found at a temperature of around 680 ºC, feeding a glycerol solution of 37 wt.% and using a spatial time of 3 g catalyst min/g glycerol. These conditions provide a 95% carbon conversion to gas, having the following composition: 67 vol.% H 2 , 22 vol.% CO 2 , 11 vol.% CO and 1 vol.% CH 4 .

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“…The performance of CLR of ethanol by Ni/CeO 2 -NR and reference conventional bulk OCs, i.e., Ni/CeO 2 , were conducted in a packed-bed reactor, whose schematic was described in our previous work [41,42]. The tested OCs of 0.5 g were loaded at the center of the quartz reactor.…”

Section: Activity and Stability Testsmentioning

confidence: 99%

Hydrogen Production from Chemical Looping Reforming of Ethanol Using Ni/CeO2 Nanorod Oxygen Carrier

Tang

Zheng

et al. 2018

Catalysts

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Chemical looping reforming (CLR) technique is a prospective option for hydrogen production. Improving oxygen mobility and sintering resistance are still the main challenges of the development of high-performance oxygen carriers (OCs) in the CLR process. This paper explores the performance of Ni/CeO 2 nanorod (NR) as an OC in CLR of ethanol. Various characterization methods such as N 2 adsorption-desorption, X-ray diffraction (XRD), Raman spectra, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), H 2 temperature-programmed reduction (TPR), and H 2 chemisorption were utilized to study the properties of fresh OCs. The characterization results show the Ni/CeO 2 -NR possesses high Ni dispersion, abundant oxygen vacancies, and strong metal-support interaction. The performance of prepared OCs was tested in a packed-bed reactor. H 2 selectivity of 80% was achieved by Ni/CeO 2 -NR in 10-cycle stability test. The small particle size and abundant oxygen vacancies contributed to the water gas shift reaction, improving the catalytic activity. The covered interfacial Ni atoms closely anchored on the underlying surface oxygen vacancies on the (111) facets of CeO 2 -NR, enhancing the anti-sintering capability. Moreover, the strong oxygen mobility of CeO 2 -NR also effectively eliminated surface coke on the Ni particle surface.

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Hydrogen production from chemical looping steam reforming of glycerol by Ni-based oxygen carrier in a fixed-bed reactor

Cited by 90 publications

References 27 publications

Hydrogen production from chemical looping steam reforming of glycerol by Ni based Al-MCM-41 oxygen carriers in a fixed-bed reactor

Hydrogen production from chemical looping steam reforming of glycerol by Ni based Al-MCM-41 oxygen carriers in a fixed-bed reactor

Analysis and optimisation of H2 production from crude glycerol by steam reforming using a novel two step process

Hydrogen Production from Chemical Looping Reforming of Ethanol Using Ni/CeO2 Nanorod Oxygen Carrier

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