FT-IR and TPD Studies of Adsorbed Pyridine on Re2O7/Al2O3Catalysts

Hydrogenolysis of Glycerol to Propanediols Over Highly Active Ru–Re Bimetallic Catalysts

“…Based on the literatures [36,37], it has been reported that rhenium oxide showed surface acidity, and this has been proved by FT-IR and TPD studies of adsorbed pyridine [36] and by the characterization of IR and ammonia thermo-desorption [37]. Furthermore, in present study, the results of XPS characterization showed that rhenium oxide species existed on the surface of the spent Ru-Re/ZrO 2 catalyst after the reaction.…”

C2–C4 light olefins from bioethanol catalyzed by Ce-modified nanocrystalline HZSM-5 zeolite catalysts

“…3. The peaks of 1545 cm −1 and 1455 cm −1 correspond to the bonds of Brönsted-pyridinium ion and pyridine coordinated to Lewis sites, respectively [28]. The percentage of Brönsted acid sites in the total number of acid sites (Brönsted acid sites + Lewis acid sites) on each of the tested samples was estimated from the integrated peak areas of the two absorption bands of the catalyst [29].…”

Promoting effect of dual modification of H-ZSM-5 catalyst by alkali treating and Mg doping on catalytic performances for alkylation of benzene with ethanol to ethylbenzene

“…The alkali-treated HZSM-5 zeolite (hereaer abbreviated to HZSM-5-AT) was prepared by a conventional method described in literatures elsewhere. [30][31][32][33] In brief, appropriate amount of NH 4 -ZSM-5 was suspended in 0.2 mol L À1 NaOH solution at 338 K for 2 h under stirring and reuxing to produce a mixture, which was then cooled and ltered, followed by washing with deionized water three times to eliminate Na + . Finally, the asprepared zeolite samples were dried at 383 K in an air oven overnight and calcined at 823 K for 4 h. One gram of the sample prepared above was mixed with 20 mL of 0.5 mol L À1 NH 4 NO 3 solution, keeping the mixture at 358 K in a water bath for 2 h under stirring, followed by washing the mixture with deionized water three times to create a cation-replaced ZSM-5 sample, NH 4 -ZSM-5-AT; nally, the NH 4 -ZSM-5-AT sample was dried at 383 K, then calcined at 823 K for 2 h to produce HZSM-5-AT.…”