The density functional theory (DFT) model ONIOM(M06L/6-311++G(2df,2p):UFF was employed to reveal the catalytic activity of Cu(II) in the paddle-wheel unit of the metal-organic framework (MOF)-505 material in the Mukaiyama aldol reaction compared with the activity of Cu-ZSM-5 zeolites. The aldol reaction between a silyl enol ether and formaldehyde catalyzed by the Lewis acidic site of both mater...

Formic acid oxidation reaction (FAOR) was studied using different platinum-zeolites hybrid catalysts. The catalysts were prepared by addition of two forms the ZSM-5 zeolite (ZSM-5-H+ and ZSM-5-NH4+) to an ink containing Vulcan carbon support Pt nanoparticles (NPs). TEM images demonstrate a proper mixture components in good dispersion NPs mainly over carbon. Both zeolites (ZSM-5-NH4+ ZSM-5-H+) a...

The promotion of Ag–ZSM-5 by cerium for the selective catalytic reduction (SCR) of NO with methane in the presence of an excess of oxygen was studied in this work. Ce–Ag–ZSM-5 catalyzes the CH4-SCR of NOx over the temperature range of 450–600◦C. Rate measurements of NO reduction to N2 under SCR conditions and of the competing CH4 oxidation by O2 (CH4 combustion) show that incorporation of a sma...

This study presents a novel combination of microwave irradiation and structured zeolite/SiC foam catalyst to improve the methanol-to-hydrocarbons (MTH) process as well its environmental sustainability. Accordingly, ZSM-5/SiC was studied under at various reaction temperatures (400–550 °C) space velocities (8 12 h−1) compared conventional ZSM-5 pellets. promoted higher selectivity towards C1−C5 h...

ZSM-5 nanoparticles coated with microporous organic polymers showed 88% retention of ammonia adsorption capacity at 43% RH.

zeolite zsm-5 presents a great source of interest in catalysis because of its shape selective properties. the absence of a relationship between the template size and shape of the structure generated during the synthesis of zeolites is illustrated by the case of zsm-5. in this study, we have investigated the role of ethanol, methyltriphenylphosphonium bromide (mtpbr) and cetyltrimethylammonium b...

The Al siting in the ZSM-5 zeolite was investigated by Al 3Q MAS NMR spectroscopy and QM/MM calculations. It was found that the occupation of the framework T-sites by Al and the concentration of Al in these T-sites are neither random nor controlled by a simple rule. They both depend on the conditions of the zeolite synthesis. At least 12 out of the 24 distinguishable framework T-sites of ZSM-5 ...

Due to crude oil is limited, new resources for fuel and petrochemicals are important to be developed. Biogas or NG (Natural Gas) can be easily converted into methanol which can be reacted over zeolite to produce olefins and gasoline. HZSM-5 zeolite catalyst has been used in this study and its modification by (0.5wt%, 1wt%, 2wt% and 4wt %) Ni to convert methanol to hydrocarbons (MTH). Catalysts ...