Thiotolerant Ir/SiO2–Al2O3 bifunctional catalysts: effect of support acidity on tetralin hydroconversion

Indene epoxidation over immobilized methyltrioxorhenium on MCM-41 silica, fumed silica and aluminosilicate materials

“…On the other hand, the concentration of Brønsted acid sites increased, but this fact was not sufficiently explained. The concentration of acid sites of pure Siral 20 was not measured, but according to the literature [26] Siral 20 is characterized by a higher concentration of Lewis acid sites and by a lower concentration of Brønsted acid sites in comparison to Siral 40. The same trend was observed after MTO immobilization, because the determined concentration of Lewis acid sites was higher and the concentration of Brønsted acid sites was lower in MTO/Siral 20 in comparison to the MTO/Siral 40 sample.…”

Supported Ir–Pd nanoalloys: Size–composition correlation and consequences on tetralin hydroconversion properties

“…SIRAL-40, containing 40 wt.% silica, was chosen as a support for its optimal performances, in correlation with its Brön-sted acidity [19]. The powder, received in hydrated form, was activated by heating at 550°C in air for 3 h. It resulted in dehydration and transformation of the alumina part from AlO(OH) (boehmite) to c-Al 2 O 3 .…”

“…We have recently shown that Ir supported on amorphous silicaalumina (ASA) is thioresistant and active in tetralin hydrogenation, ring contraction, and ring opening [16,19]. The selectivity to ringopening/contraction products (ROCPs) is roughly proportional to the acid/metal site number ratio.…”

NiMo catalysts supported on graphene-modified mesoporous TiO2 toward highly efficient hydrodesulfurization of dibenzothiophene

“…To meet the increasing stringent environmental regulations, deep/ultra-deep desulfurization are in urgent demanding [1][2][3][4]. Hydrodesulfurization (HDS) is one of the most widely used techniques for removing sulfur-containing compounds from petroleum products in the refining industry, where HDS catalyst plays a vital role in the determining process.…”