Different lanthanide (Ln)-doped cerium oxides (Ce0.5Ln0.5O1.75, where Ln: Gd, La, Pr, Nd, Sm) were loaded with Cu (20 wt. %) and used as catalysts for the oxidation of ethyl acetate (EtOAc), a common volatile organic compound (VOC). For comparison, both Cu-free (Ce-Ln) and supported Cu (Cu/Ce-Ln) samples were characterized by N₂ adsorption at -196 °C, scanning/transmission electron microscopy, ...

Dealuminated BEA zeolite (SiBEA) was chosen as a support of metal oxide(s) phase for catalytic combustion volatile organic compounds (VOCs). Copper and/or manganese were deposited at various Cu/Mn molar ratios. Factors influencing the activity found by physicochemical methods, including XRD, XRF, low-temperature N2 adsorption, FT-IR, UV–Vis-DRS, STEM-EDX, XPS and H2-TPR. Depending on chemical c...

MXenes have attracted considerable attention owing to their versatile and excellent physicochemical properties. Especially, they potential applications as robust support for single atom catalysts. Here, quantum chemical studies with density functional theory are carried out systematically investigate the geometries, stability, electronic properties of oxygen functionalized Ti2C (Ti2CO2) support...

Vanadyl pyrophosphate (VPP) is the active catalytic phase that converts n-butane to maleic anhydride in fixed beds, fluidized and DuPont’s circulating bed (CFB). The original CFB concept was based on Mars van-Krevelen reaction mechanism which solid lattice contributes all of oxygen partially oxidize n-butane. However, maintain high activity selectivity requires surface oxidized; thus, DuPont co...

In the present study, the multivariate adaptive regression splines (MARS) technique is employed to estimate the drying shrinkage of concrete. To this purpose, a very big database (RILEM Data Bank) from different experimental studies is used. Several effective parameters such as the age of onset of shrinkage measurement, age at start of drying, the ratio of the volume of the sample on its drying...

Kinetic analysis and isotopic tracer studies were used to identify elementary steps and their reversibility in the oxidative dehydrogenation of propane on VOx /ZrO2 catalysts with VOx surface densities between 1.6 and 6 VOx /nm2. Competitive reactions of C3H6 and CH3CH2CH3 showed that CO forms via secondary combustion of propene intermediates. CO2 formed via this reaction and also via the direc...

Propylene is an important raw material and extensively used in the petrochemical industry. There has been a continuously growing demand for propylene in recent years around the world1–3. The majority of propylene is produced as a byproduct from processes such as steam cracking of naphtha and fluid catalytic cracking (FCC)4,5. Additional sources of propylene included dehydrogenation of propane, ...