Nitric Oxide (NO) decomposition over three catalysts supported on synthesized ZSM-5 zeolites and MCM-41 MOLECULAR SIEVEs was investigated in a packed bed tubular reactor. Synthesized zeolite supported catalysts were prepared using ion-exchange and incorporation methods with copper during zeolite or MOLECULAR SIEVE synthesis procedures. Although Cu -ZSM-5 zeolites alone and a mixture of copper ion-exchanged ZSM-5 zeolite and MCM-41 MOLECULAR SIEVEs were active, Cu-MCM-41 was not active for direct decomposition of NO. The mixture exhibited equal or higher activity in comparison with the Cu -ZSM-5 zeolite with a higher copper loading in the temperature range of 250-650 °c. This catalyst was not deactivated at temperatures up to 650 °c. Up to 90% conversion was achieved over this catalyst when propene was used as a reducing agent, but methane did not have a positive effect on NO conversion into N2 when oxygen was present.

In this study, nanoscale MCM-41 MOLECULAR SIEVE was prepared under a basic condition by a hydrothermal method using cetyltrimethylammonium bromide as a template and tetraethyl orthosilicate as a silica source. Methylated nanoscale MCM-41 MOLECULAR SIEVE was prepared from the nanoscale MCM-41 by post-synthesis method using trimethylchlorosilane (TMCS) as coupling agent. The product was characterized by means of element analysis, powder X-ray diffraction, Fourier transform infrared (FT-IR) spectroscopy, low-temperature nitrogen adsorption-desorption technique at 77 K, scanning electron microscopic (SEM), thermogravimetry-differential thermal analysis (TG-DTA). Powder XRD showed that the framework of the MOLECULAR SIEVE was well retained and the degree of ordering of the methylated MCM-41 decreases. IR spectra and the low-temperature nitrogen adsorption-desorption technique suggested that methyl was successfully grafted to the inner surface of the methylated MCM-41 and the mesoporous channels of the methylated MCM-41 were still maintained. Scanning electron microscopic results showed that the average size of the methylated MCM-41 prepared was 112 nm. Differential thermal analysis showed that the prepared material has preferable thermal stability and the methylated MCM-41 can be stable at 903oC.

Nanometer MCM-41 MOLECULAR SIEVE was prepared under a base condition by using cetyltrimethylammonium bromide as template and tetraethyl orthosilicate as silica source by means of hydrothermal method. Lanthanum (III) was incorporated into the nanometer MCM-41 by a liquid phase grafting method. The prepared nanocomposite materials were characterized by means of powder X-ray diffraction, spectrophotometric anaylsis, Fourier transform infrared spectroscopy, low temperature nitrogen adsorption-desorption technique, solid diffuse reflectance absorption spectra and luminescence. The powder X-ray diffraction studies show that the nanometer MCM-41 MOLECULAR SIEVE is successfully prepared. The highly ordered mesoporous two-dimensional hexagonal channel structure and framework of the support MCM-41 is retained intact in the prepared composite material La-(nanometer MCM-41). The spectrophotometric anaylsis indicates that lanthanum exists in the prepared nanocomposite materials. The Fourier transform infrared spectra indicate that the framework of the MCM-41 MOLECULAR SIEVE still remains in the prepared nanocomposite materials and some framework vibration peaks show blue shifts relative to those of the MCM-41 MOLECULAR SIEVE. The low temperature nitrogen adsorption-desorption indicates that the guest locates in the channel of the MOLECULAR SIEVE. Compared with bulk lanthanum oxide, the guest in the channel of the MOLECULAR SIEVE has smaller particle size and shows a significant blue shift of optical absorption band in solid diffuse reflectance absorption spectr The observed blue shift in the solid state diffuse reflectance absorption spectra of the lanthanum-(nanometer MCM-41) sample show the obvious stereoscopic confinement effect of the channel of the host on the guest, which further indicates the successful encapsulation of the guest in the host. The La-(nanometer MCM-41) sample shows luminescence.

This work reports, immobilization the Cobaloxime [Co (DH)2 Cl; DH, dimethylglyoximato)] onto the MCM-41. The surface of MCM- was initially functionalized with -aminopropyltrimethoxysilane and 3-pyridine. For the electrostatic immobilization this was reacted with Cobaloxime and immobilization was achieved by an electrostatic interaction between the Co Cobaloxime and the N of the pyridine and NH amine. Additional information was obtained by powder X-ray diffraction (XRD), BET, ICP and DR-UV-Vis, FT-IR spectroscopy.

Ti-MCM-41 was synthesized at pH 3, 7 and 11. The titanium content was determined by AAS and found to be 4%, 3.2% and 4.5%, respectively. In order to increase the titanium content in Ti-MCM-41, Ti(IV) ions were grafted onto Ti- MCM-41 using TiCl4 in toluene and Ti(OBu)4 in ethanol. The incorporation of Ti was determined to be 28% and 30%, respectively. The oxidation of olefins such as cyclopentene, cyclohexene, norbornene and trans-2-hexene-1-ol with TBHP in the presence of Ti-grafted Ti-MCM-41 were carried out in CHCl3. This system successfully catalized the oxidation of these olefins toward the corresponding epoxides with 60 to 90% reactivity and 95 to 100% selectivity.