Superior performance in deep saturation of bulky aromatic pyrene over acidic mesoporous Beta zeolite-supported palladium catalyst

Effect of the Mesostructuration of the Beta Zeolite Support on the Properties of Cobalt Catalysts for Fischer–Tropsch Synthesis

“…It can be noted the characteristic pattern of beta zeolite, corresponding to the JCPDS-48-0074 file (7.6°; 21.1°; 22.4°; 25.2°; 27.1°; 28.5°; 29.5°and 33.1°), which shows peaks up to 2h near to 36°. Meanwhile, a peak at 43.45°was observed in the diffractograms, also detected by other authors [35][36][37]. The cobalt impregnation led to a decrease in the intensity of the diffraction peaks of beta zeolite and this effect increased with the metal content.…”

Mesoporous zeolite-supported metal sulfide catalysts with high activities in the deep hydrogenation of phenanthrene

“…Because aromatic hydrogenation is an exothermic and reversible reaction, catalysts with high activities at low temperature and pressure could benefit deep hydrogenation. Extensive studies show that noble metal catalysts such as Pd, Pt, and Pd-Pt have high activities [12][13][14], but they are fairly sensitive to sulfur and nitrogen compounds, severely limiting their practical applications [15][16][17][18]. Therefore, developing highly active catalysts with good sulfur resistance for the deep hydrogenation of aromatics at low temperature and pressure is of great importance for the cost-effective production of clean diesel fuel.…”

Designing Porous Inorganic Architectures

“…In addition, much more light olefins were also detected [174] Hydrodesulfuration of gasoline and diesel fuels Pt, Pd, and Pt-Pd mesoporous ZSM-5 zeolite (total metal content of 0.5 wt%) Higher sulfur removal efficiency than metal/microporous zeolite or metal/γ-Al 2 O 3 [175] Hydrodesulfuration of gasoline and diesel fuels Pd/mesoporous Beta Better catalytic performance than Pd/Al-MCM-41 (51% vs 35%) because of the higher acidity of the zeolite; and than Pd/conventional Beta because of its larger mesopore volume [176,177] Aromatization and isomerization of 1-hexene Hierarchical zeolite prepared by desilication with 0.5 M NaOH Selectivity toward aromatics of 19.1% while the selectivity values obtained with the conventional ZSM-5 drop to 5.1% [178] Butene aromatization at 350 • C Hierarchical ZSM-5 After 34 h of time onstream, conversion over hierarchical ZSM-5 remains at 99%, while over conventional HZSM-5 drops to 93%. Ascribed to a lower deposition of coke inside the micropores [179] Dehydroaromatization of methane Alkylation of benzene with ethene Mesoporous ZSM-5 Activity and selectivities toward ethylbenzene higher than those of the conventional ZSM-5 [142] Alkylation of benzene with ethene Mesoporous mordenite Five to sixfold increased production of ethylbenzene compared to conventional mordenite [153] (continued overleaf) Aryl coupling reactions (Suzuki, Heck, and Sonogashira) involving bulky substrates Pd-exchanged mesoporous sodalite and NaA zeolite High activity and reusability avoiding the usual problem of Pd leaching and agglomeration [184] Synthesis of jasminaldehyde Mesoporous MFI zeolite Much higher activity (98%) than conventional ZSM-5 (3.9%), Al-MCM-41 (25%), and ZSM-5 seed-assembled mesoporous (SAM, 64%) materials.…”