Distribution of acid-site strengths in hydrogen zeolites and relationship between acidity and catalytic activity

Heats of Adsorption of Ammonia and Correlation of Activity and Acidity in Heterogeneous Catalysis

“…The procedure of calorimetric measurements has already been described (Brueva et al, 2001). On analyzing acid properties of the heterogeneous catalysts, pyridine, n-buthylamine and NH 3 are the most frequently used probe molecules (Klyachko et al, 1978).…”

“…The procedures for evaluating the catalytic activity in reactions of cracking noctane and iso-octane, of disproportionation of ethylbenzene and dehydration of 3-methylbutanol-2 were described earlier (Brueva et al, 2001).…”

Application of computational methods to catalytic systems

“…The distribution of Al and Si in zeolite frameworks has a strong influence on their catalytic properties [89]. Unfortunately X-ray diffraction is not practical for the direct detection of Al locations on zeolites.…”

“…Several authors suggest that there is a correlation between catalytic activity and the presence of non-framework Al active species [89,[102][103][104][105]. In this subsection, we present the study of water molecules interactions around an Al site located on a 4-ring.…”

Theoretical study of conversion reactions of ketone to hydroxyalkylene in cluster models of zeolite H-ZSM-5

“…They have been known as the one of the most important heterogeneous catalysts [1][2][3][4]. Therefore, zeolites were widely studied for their acidic properties of Brønsted acid sites [5,6] using several techniques [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. The hydrogenbonded complexes due to the interaction between waters and Brønsted acids of zeolites were studied [20][21][22].…”