The conversion of methane to methanol over zeolitic a-oxygen sites has been demonstrated using Fe-ZSM-5. To discriminate between monoand poly-nuclear active sites, we prepared the [Fe]-ZEO with iron in the ZEOlite lattice via direct synthesis and Fex-ZEO, by dispersion of x wt.% iron on the ZEOlite. Shape-selective formation of nano-clusters of iron oxides with various sizes is realized inside ...

The action of a tetrapropylammonium hydroxide solution on lamellar zeolite precursor MCM-22P produced a stable aqueous colloidal suspension which was shown by X-ray diffraction, small angle X-ray scattering and atomic force microscopy to contain ultrathin two-dimensional (2D) crystallites, including one-unit cell thick (i.e., 2.5 nm) monolayers.

Dealumination of MCM-68 zeolite with MSE topology enhanced the selectivity to propylene (45-50%) and durability to coke formation during hexane cracking, regardless of the reaction temperature, which is attributed to the control of the position and density of acid sites originating from the framework Al atoms.

Fe/ZSM-5 nanosheet zeolites of varying thickness were synthesized with di- and tetraquaternary ammonium structure directing agents and extensively characterized for their textural, structural, and catalytic properties. Introduction of Fe3+ ions in the framework of nanosheet zeolites was slightly less effective than in bulk ZSM-5 zeolite. Steaming was necessary to activate all catalysts for N2O ...

A two-stage pyrolysis−catalytic steam reforming process was used with mesoporous MCM-41 supported iron and nickel bimetallic catalysts for hydrogen-rich syngas production from a simulated mixture of waste plastics. Different Fe/Ni weight ratios (00:20, 05:15, 10:10, 05:15, and 20:00) have been investigated to determine the influence on hydrogen production. The results showed that the presence o...

incorporation of [fe(bipy)cl4][bipy.h] (1) (where bipy is 2,2′-bipyridine) in the molecular sieves of the type lta, nay and mesoporous al-mcm-41 by using a “ship in a bottle synthesis” approach was investigated. [fe(bipy)cl4][bipy.h] was successfullyincorporated in the channels ofmesoporousal-mcm-41, and the product was characterized by x-ray diffraction, ftir and bet analysis. it was fou...

MCM-41 based catalysts (molar ratio Si/Al = 40) were prepared by a hydrothermal route, modified ionic exchange with different metals (Cu, Cr, Fe and Zn) finally calcined at 550 °C. The fully characterized techniques that confirmed the formation of oxides on surfaces all materials. Low-angle X-ray diffraction (XRD) analyses showed calcination resulted in incorporation metallic Zn, Cr framework M...

The nitric oxide (NO) removal capacity of ion-exchanged zeolite Y obtained from coal combustion fly ash was evaluated in this work. Zeolite Y was exchanged either with Cu or Fe to obtain two different catalysts for the selective catalytic reduction of NOx from flue gas. The selective catalytic reduction experiments were carried out at temperatures ranging from 50°C to 350°C, water content 0% an...