Catalyst Characterization

Characterization and catalytic performance of potassium loaded on rice husk silica and zeolite nay for transesterification of jatropha seed oil

“…A hysteresis loop was observed beginning at a relative pressure of 0.45, which corresponded to the capillary condensation of the adsorbate in nonuniform mesopores. 12,13 On the other hand, the isotherms for 12K/RHS-B and 12K/RHS-A showed much lower adsorptions than the parent RHS, indicating that both catalysts had a very low surface area. The impregnation of RHS using both precursor solutions and the following heat treatment caused the collapse of both the micropores and mesopores of the RHS.…”

“…The absence of K 2 O peaks indicated a good dispersion of the metal oxide throughout the zeolite surface. 6,12 In the nitrogen adsorption-desorption isotherms of the catalysts with different potassium loading (Figure 4), it was observed that the surface area decreased with an increase in potassium loading with a linear relationship (R 2 = 0.98). In addition, the external surface area, micropore area, and micropore volume of the catalysts were all lower than those of the parent zeolite NaY (Table 1) and tended to decrease with an increase in potassium loading.…”

Degradation of Chloroform by Zerovalent Iron: Effects of Mechanochemical Sulfidation and Nitridation on the Kinetics and Mechanism

“…Moreover, the characteristic peaks of Fe 2 O 3 and Fe 3 O 4 were found to widen after the particles were reacted for 10 days. These results suggest that the crystallite size of the formed Fe 2 O 3 and Fe 3 O 4 decreased during the reaction based on the Debye–Scherrer equation . No iron (hydr)­oxide was detected for the reacted S–ZVI at the reaction time of 8 h or 2 days.…”

“…These results suggest that the crystallite size of the formed Fe 2 O 3 and Fe 3 O 4 decreased during the reaction based on the Debye−Scherrer equation. 69 No iron (hydr)oxide was detected for the reacted S−ZVI at the reaction time of 8 h or 2 days. Fe 2 O 3 and Fe 3 O 4 emerged after the particles reacted for 10 days.…”

Efecto del soporte en las propiedades catalíticas del sistema NiMoS/Al₂O₃-ZrO₂ en la hidrodesoxigenación del guayacol

“…Los ángulos de difracción son diferentes para los distintos planos dentro del cristal, y por lo tanto cada compuesto o elemento tiene su propio patrón de difracción único. Las diferencias en estos patrones, por lo tanto, permiten la diferenciación de varias estructuras dentro del catalizador [52]. Los sólidos de óxidos simples de Al2O3 y ZrO2, así como los óxidos mixtos se analizaron con esta técnica, en un equipo Brucker D8…”