Catalytic steam reforming of tar derived from steam gasification of sunflower stalk over ethylene glycol assisting prepared Ni/MCM-41

Abstract

Ethylene glycol (EG) assisted impregnation of nickel catalyst on MCM-41 (Ni/MCM-41-EG) was performed and applied for steam reforming of tar derived from biomass. The catalyst was characterized by SEM-EDX, BET, XRD, and TPR. It is found that smaller nickel particles were well dispersed on MCM-41 and better catalytic activity was shown for the Ni/MCM-41-EG when compared with the catalyst of Ni/MCM-41 prepared by using the conventional impregnation method. H 2 yield increased approximately 8 % when using 20 wt.% Ni/MCM-41-EG instead of 20 wt.% Ni/MCM-41 for the steam reforming of tar derived from sunflower stalk. The catalyst reusability was also tested up to five cycles, and no obvious activity reduction was observed. It indicates that EG assisted impregnation method is a good way to prepare metal loaded porous catalyst with high catalytic activity, high loading amount and long-term stability for the tar reforming.

Selectively catalytic upgrading of bio-oil to aromatic hydrocarbons over Zn, Ce or Ni-doped mesoporous rod-like alumina catalysts

“…It should be noted that the diffraction peak intensities of Al2O3-0.5 are weak, indicating that the use of CTAB to modify in the Al2O3 porous structure could retard the crystallization to some extent [18]. Interestingly, after metal is doped on Al2O3-0.5, the diffraction intensities increase due to the incorporation between loaded metal with Al2O3 structure [19]. Moreover, one can see that some new phases, i.e., ZnAl2O4, CeAlO3, NiAl2O4 are also observed in spite of no appearance of diffraction peaks attributed to metal species of Zn, Ce and Ni.…”

“…Moreover, one can see that some new phases, i.e., ZnAl2O4, CeAlO3, NiAl2O4 are also observed in spite of no appearance of diffraction peaks attributed to metal species of Zn, Ce and Ni. It indicates that metal species should be well distributed on Al2O3 structure, which could lead to the reduction of sintering, accumulation and deactivation during the thermal reactions [19]. (Fig.…”

“…Interestingly, at the first reuse cycle, all metal loaded catalysts present the increase of hydrocarbon amount when compared with the fresh catalysts, indicating that the reused catalysts have better catalytic activity than the fresh ones. This should be attributed to the contribution of alkali metal or alkaline earth metal (AAEM) species such K and Ca on the spent catalyst, which are derived from the pyrolysis of sunflower [19,26]. Fig.…”

“…The proximate and ultimate analysis results and ash compositions of this biomass were reported elsewhere [19].…”

Influence of promoted 5%Ni/MCM-41 catalysts on hydrogen yield in CO2reforming of CH4

“…On the other hand, impregnating the 1%Ru‐Ni/MCM‐41 with Mg reduced the reverse water gas shift reaction (RWGSR) and subsequently enhanced catalytic efficiency that resulted in higher CH 4 conversion. Karnjanakom et al investigated the SR of tar derived from biomass using Ni/MCM‐41 assisted with ethylene glycol (EG) . Their research showed that tiny Ni particles were well spread on MCM41 and good catalytic activity was revealed for the Ni/MCM‐41‐EG.…”