Catalytic aluminas II. Catalytic properties of eta and gamma alumina

Determination of surface OH acidity from the formation of acid/base complexes on ultrathin films of γ-Al2O3 on NiAl(100)

“…Thus, the determination of surface acidity is of great utility in the development of a detailed picture of the surface chemistry of this widely used metal oxide. The chemistry of γ -Al 2 O 3 , which is used as an industrial acid-base catalyst [3][4][5][6][7][8] and metallic catalyst support [9][10][11], depends on the surface composition, particularly the quantity, types, and acidity of the surface catalytic sites [12][13][14]. Perhaps, the most important sites are the surface hydroxyl groups because they provide the sites for Brønsted acid-catalyzed reactivity, as we have reported for the dimerization of 1,3-butadiene on hydroxylated thin films of γ -Al 2 O 3 [15,16].…”

Dehydration of methanol over Nordstrandite based catalysts for dimethyl ether synthesis

“…The sample was completely changed to g-Al 2 O 3 after calcination at higher temperature. The change of the sample weight was detected by thermal analysis (TGA/DTG) to investigate water loss related to their surface area, phase change and acidic properties [16,17]. The weight change of sample with temperature is shown in Fig.…”

Using kinetics to study intermediates in acid catalyzed reactions on solids

“…The reactions which now have measurable rates are the more demanding ones: skeletal isomerization and cracking [69,70].…”

“…Figure 1 shows the selectivity plot for cis-and trans-2-hexene formation from 1-hexene on HY zeolite catalyst at 200°C [3]. There is no doubt that both isomers are primary products of the 1-2 double bond shift [68,70]. The initial selectivities measured from the slopes are 0.4!5 for cis ~-ud 0.500 for trans.…”