Hydrogen is a clean energy source with a relatively low pollution footprint. However, hydrogen does not exist in nature as a separate element but only in compound forms. Hydrogen is produced throug...

https://www.tandfonline.com/doi/pdf/10.1080/19942060.2018.1452296

Computational intelligence approach for modeling hydrogen production: a review

Ni supported on CaO-MgO-Al2O3 as a highly selective and stable catalyst for H2 production via the glycerol steam reforming reaction

A review for key challenges of the development of biodiesel industry.

Hydrothermal catalytic processing of waste cooking oil for hydrogen-rich syngas production

Thermogravimetric kinetic modelling of in-situ catalytic pyrolytic conversion of rice husk to bioenergy using rice hull ash catalyst

The present work investigates the catalytic potential of a Ni-promoted Fe/Mg containing metallurgical waste for sustainable hydrogen production by glycerol steam reforming (GSR). The catalyst (Ni-UGS) was prepared through solid-state impregnation of Ni into the structure of metallurgical residue. Ni incorporation led to the formation of (Ni,Mg)O solid solution, (NiFe 2 O 4 ) and/or a nickel iron mixed oxide (Ni x Fe 1-x O). GSR performed in a fixed bed reactor at T = 580 °C, P = 1 atm, steam to carbon ratio (S/C) of 3, and gas hourly space velocity (GHSV) of 20,600 cm 3 (STP) g cat −1  h −1 led to a glycerol conversion to gaseous (X g ) of 87%, H 2 yield (Y H2 ) of 79%, and H 2 /CO molar ratio of 5.5. The catalytic performance of Ni-UGS containing 11.7 wt.% Ni was found to be superior to that of an alumina supported Ni-based commercial steam reforming catalyst with higher Ni content (29.8 wt.%): X g  = 86%, Y H2  = 71%, and H 2 /CO molar ratio of 4.1. A stable performance during 48 h on stream was also obtained by using the Ni-UGS catalyst. Characterization of the used catalyst confirmed the low formation rate (∼2.7 mg coke  g cat −1  h −1 ) of filamentous type carbon. The promising obtained results were mainly attributed to (i) superior dispersion of Ni particles due to the formation of (Ni,Mg)O solid solution and (ii) the presence of active magnesium and iron oxide species (e.g., MgO, Fe 3 O 4, MgFe 2 O 4 and (MgO)(FeO) solid solution) in the Ni-UGS catalyst which stimulate the water gas shift reaction and coke gasification. Regeneration by an oxidative treatment of the used catalyst in air was examined and analysis of the regenerated catalyst revealed complete coke removal together with recovery of initial crystalline phases.

Hydrogen production by glycerol steam reforming catalyzed by Ni-promoted Fe/Mg-bearing metallurgical wastes

A novel method was developed for the synthesis of a more easily reducible NiAl2O4 spinel, which was tested as catalyst for hydrogen production by glycerol steam reforming. A Ni-Al mixed-metal alkoxide was firstly prepared through solvothermal method and then calcined using a two-step calcination technique. XRD, N2 physisorption, H2-TPR, XPS, SEM, and TEM results show that this new catalyst is more readily reducible and possesses a more developed porous structure with higher surface area. It therefore exhibits high H2 yield (76.38 %) and glycerol conversion into gaseous products (95.42 %). To avoid or reduce coke formation, 10 wt.% CeO2 was incorporated into the catalyst structure. TGA, TEM, and Raman spectroscopy analyses reveal the suppression of coke by a large extent due to the formation of well-dispersed CeAlO3, which decreases significantly the filamentous carbon formation rate on nickel surface and promotes coke gasification by providing oxidative environment around nickel active sites.

A novel synthesis of NiAl2O4 spinel from a Ni-Al mixed-metal alkoxide as a highly efficient catalyst for hydrogen production by glycerol steam reforming

Coal fly ash (FA) supported Ni catalysts (Ni-FA) were synthesized via solid-state impregnation method and systematically characterized by XRD, N2-physisorption, H2-TPR/TPD, H2-pulse chemisorption, XPS, TPO, TGA, Raman, and TEM. The effect of different parameters including (i) types of FA, (ii) Ni loading (2.5–15 wt.%), and (iii) reforming temperature (530–730 °C), on the catalytic performance of yNi-FAx catalysts in glycerol steam reforming was investigated. The best performance in terms of activity (glycerol conversion to gas products = 98 %, H2 yield = 78.8 %) and stability (40 h, with low rate of coke formation and sintering 2.44 mgcoke· g catalyst − 1 ·h−1) was achieved for 7.5 % Ni-FA4 catalyst at 630 °C. This was attributed to a higher dispersion of Ni° active sites and stronger interaction with the support, due to the higher surface area of FA4 and the presence of nepheline (providing vacancy sites for anchoring Ni particles) and thermostable mullite.

Development of residue coal fly ash supported nickel catalyst for H2 production via glycerol steam reforming

Development of a Fe/Mg-bearing metallurgical waste stabilized-CaO/NiO hybrid sorbent-catalyst for high purity H2 production through sorption-enhanced glycerol steam reforming

Ommolbanin Alizadeh Sahraei

Papers

Hydrogen production by glycerol steam reforming catalyzed by Ni-promoted Fe/Mg-bearing metallurgical wastes

A novel synthesis of NiAl2O4 spinel from a Ni-Al mixed-metal alkoxide as a highly efficient catalyst for hydrogen production by glycerol steam reforming

Development of residue coal fly ash supported nickel catalyst for H2 production via glycerol steam reforming

Development of a Fe/Mg-bearing metallurgical waste stabilized-CaO/NiO hybrid sorbent-catalyst for high purity H2 production through sorption-enhanced glycerol steam reforming

A comparative study on the performance of M (Rh, Ru, Ni)-promoted metallurgical waste driven catalysts for H2 production by glycerol steam reforming