Simply packaging Ni nanoparticles inside SBA-15 channels by co-impregnation for dry reforming of methane

Abstract

The highly dispersed Ni nanoparticles inside SBA-15 channels (Ni@SBA-15) were synthesized simply by co-impregnation using ethylene glycol (EG).

Well-dispersed nickel nanoparticles on the external and internal surfaces of SBA-15 for hydrocracking of pyrolyzed α-cellulose

“…In this case, small nickel particles only lled a small part of the channels because of the inhomogeneous distributions of nickel particles that were formed due to inability of water as a solvent to suppress the redistribution and agglomeration during drying, calcination, and reduction processes; this result corresponded to previous results. 22 Meanwhile, on catalysts prepared via co-impregnation, as seen in Fig. 5C and E, nickel particles were anchored inside the channels of SBA-15 due to the presence of EG, which could conne the small nickel nanoparticles in place.…”

“…25 The addition of ethylene glycol into the nickel nitrate aqueous solution has been reported to decrease the surface tension of impregnation solutions because it can act as a surfactant, which is preferred for better wetting of the support and increasing the rate of diffusion and infusion into deeper mesoporous channels of the catalyst support. 22 During the drying process, the solvent was gradually removed. At this stage, the concentrated solvent with lower surface tension could diffuse deeply at rst and was transported toward the internal surface of the mesoporous channels via capillary forces.…”

“…At this stage, the concentrated solvent with lower surface tension could diffuse deeply at rst and was transported toward the internal surface of the mesoporous channels via capillary forces. 22 At the end of drying, the catalyst exhibited strong interaction with the internal surface of the support and inhibited the redistribution of the impregnation solution; also, uniform distribution of the active component in the mesopore channels could be achieved. In contrast, the precursor exhibited weak interaction with the support without EG; the concentrated solvent adsorbed by the mesoporous pores could be back diffused by higher surface tension and it migrated toward the external surface of the mesoporous channels, resulting in a concentration build up on the external rim of the support.…”

“…As a consequence, inhomogeneous distributions of the precursor were observed. 22 The loading of Ni on SBA-15 affected the acidity of the catalyst. As presented in Table 1, the presence of nickel increased the acidity of the catalysts and as the concentration of nickel increased, the acidity increased.…”

“…20,21 A nickel catalyst supported on SBA-15 via coimpregnation using ethylene glycol was also reportedly synthesized and it showed excellent stability in the dry reforming of methane with CO 2 to produce syngas and hydrogen. 22 Ni/SBA-15 also showed high activity and achieved high hydrocarbon yields in the hydrodeoxygenation reaction for upgrading lignin-derived bio-oils. 23 Based on these considerations, nickel catalysts supported on SBA-15 were synthesized via wet impregnation and coimpregnation using ethylene glycol.…”