The effects of synthesis operation conditions on the properties of modified γ-alumina nanocatalysts in methanol dehydration to dimethyl ether using factorial experimental design

A Comparative Study of Solvothermal and Sol‐Gel‐Derived Nanocrystalline Alumina Catalysts for Ethanol Dehydration

“…It suggested that the weak to moderate acid sites were decreased, but the amount of strong acid strength was increased. The results were probably due to the changes made by alternation of some strong acidic sites to the weak to moderate ones in modified catalysts [20]. A similar result was carried out by Li et al [41], which reported that the presence of Mn 4+ in molecular sieve catalyst caused the higher strong acidity, but lower weak acid site.…”

“…The 10 wt.% of Nb 2 O 5 exhibited the highest activity in the low temperature due to its largest surface area. In another work by Yaripour et al [20], the SiO 2 modification showed a promising way to increase a catalytic activity. Both yield and selectivity were the highest at 2 wt.% of silica, which was attributed to high surface area and high surface acidity, especially the highest weak to moderate acid site.…”

PANI-derived polymer/Al2O3 nanocomposites: synthesis, characterization, and electrochemical studies

“…The high purity metal oxides nanoparticles were synthesized as yet by variety methods such as precipitation, hot-air spray pyrolysis, sol-gel, hydrothermal and sonochemical [9][10][11][12][13][14][15].…”

“…For example, alumina has a large surface area, adsorption capacity, and shows good wear resistance [20,21], so it is commonly used as catalyst, catalyst support, filter, and filler for polymers to improve mechanical properties [22,23]. At least, seven different transitional aluminas have been reported and Al 2 O 3 nanoparticle is perhaps, the most important one for its industrial applications [13,15,24,45].…”

Synthesis and Characterization of Al(OH)3, Al2O3 Nanoparticles and Polymeric Nanocomposites

“…Due to the significant advantages of gamma phase, its synthesis is highly regarded. The high purity nanocrystalline alumina powders were synthesized as yet by variety methods such as precipitation, hot-air spray pyrolysis, sol-gel and hydrothermal [17][18][19][20][21][22].…”