Effect of Pd- precursor and support acid properties on the Pd electronic state and the hydrodesulfurization activity of Pd-zeolite catalysts

Highly active Pd containing EMT zeolite catalyst for indirect oxidative carbonylation of methanol to dimethyl carbonate

“…The H 2 -TPR profiles of the two catalysts contain low-and hightemperature reduction peaks, which were assigned to the weakand strong-interaction Pd species with zeolite framework, respectively ( Fig. 11) [51,65,66]. Similar low-and high-temperature reduction peaks were also measured by mass spectrometer for a new Pd/EMT catalyst loaded with 5 wt% Pd (Fig.…”

Deep Hydrogenation Saturation of Naphthalene Facilitated by Enhanced Adsorption of the Reactants on Micro‐Mesoporous Pd/HY

“…The shifting of the Pd 0 peak to higher binding energy demonstrates the electron deficiency of Pd metal, which is favorable to the saturation reaction. [17,38] Although the catalyst was subjected to a high-pressure hydrogen atmosphere at 200°C for 2 h, there were still some divalent Pd atoms that were not reduced as detected by XPS. In Figure 5a, we can see that only 64.5 % of Pd 0 exists in Pd/HYa.…”

Effect of Pd Precursor Salts on the Chemical State, Particle Size, and Performance of Activated Carbon-Supported Pd Catalysts for the Selective Hydrogenation of Palm Biodiesel

“…Supported Pd catalysts are commonly used for selective hydrogenation in the refining and petrochemical industry [ 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 ]. When Pd catalysts are prepared via aqueous impregnation, the Pd precursor salts and corresponding precursor solutions with different pH values are important factors that could be used to control the interactions (e.g., electrostatic or ion-exchange interactions) between the Pd precursors and supporting materials such as alumina [ 12 , 13 , 14 ], silica [ 15 , 16 , 17 , 18 , 19 ], and activated carbon (AC) [ 20 , 21 ].…”

“…Supported Pd catalysts are commonly used for selective hydrogenation in the refining and petrochemical industry [ 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 ]. When Pd catalysts are prepared via aqueous impregnation, the Pd precursor salts and corresponding precursor solutions with different pH values are important factors that could be used to control the interactions (e.g., electrostatic or ion-exchange interactions) between the Pd precursors and supporting materials such as alumina [ 12 , 13 , 14 ], silica [ 15 , 16 , 17 , 18 , 19 ], and activated carbon (AC) [ 20 , 21 ]. The microporous and mesoporous structures, surface properties, and functional groups of supporting materials also play important roles in controlling the dispersion and chemical state of Pd, hence it influences the performance of obtained Pd catalysts [ 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 ].…”

“…Similarly, Panpranot et al reported that the activity of the SiO 2 -supported Pd catalysts prepared using PdCl 2 as a precursor salt for the complete hydrogenation of 1-hexene to hexane was higher than those of the catalysts prepared using Pd(NO 3 ) 2 or Pd(OOCCH 3 ) 2 as a precursor salt because the Pd particle size of the Cl-containing catalysts was smaller than those of the Cl-free catalysts [ 15 ]. Yashnik et al determined that the pH of the impregnating cationic [Pd(NH 3 ) 4 ] 2+ and anionic [PdCl 4 ] 2− precursor solutions and relative charge of the H-ZSM-5 zeolite surface affected the localization of Pd particles and, consequently, the efficiency and stability of the zeolite-supported Pd catalysts for the hydrodesulfurization of thiophene [ 18 ].…”