Surface Characterization of Zn-modified H-ZSM-5 Zeolites

Adsorption of carbon monoxide in H-ZSM-5 and Li-ZSM-5 zeolites: an embedded ab initio cluster study

The absorption of carbon monoxide with H-ZSM-5 and metal-substituted Li-ZSM-5 zeolites has been investigated by Ž . using both cluster and embedded cluster approaches at the HFr6–31G d,p level of theory. For the H-ZSM-5 zeolite, the binding energy of CO on a 3T quantum cluster is predicted to be 2.25 kcalrmol for the C-bound complex. The O-bound complex was found to be less stable by about 0.84...

Acidity Characterization of H-zsm-5 Catalysts Modified by Pre-coking and Silylation

A comprehensive study on the acidic and coking properties of selectivated H-ZSM-5 catalysts during xylene isomerization has been made. The effects of surface modification by pre-coking and silylation on the nature and location of carbonaceous deposits and on related acidic features of the spent catalysts were respectively characterized by Xe NMR of adsorbed Xe and solid-state P MAS NMR of adsor...

ZnO modified ZSM-5 and Y zeolites fabricated by atomic layer deposition for propane conversion.

ZnO modified ZSM-5 and Y zeolites are synthesized by performing atomic layer deposition (ALD) of ZnO to HZSM-5 and HY using diethyl zinc and water as the precursors. The surface area and pore volume of ZSM-5 and Y zeolites are progressively reduced with the increasing number of ZnO ALD cycles. XRD and SEM characterization methods show that highly dispersed ZnO species are deposited on the inter...

Dehydration of Methanol to Dimethyl Ether Employing Modified H-ZSM-5 Catalysts

Hydrocarbon Detection with Metal Oxide Semiconducting Gas Sensors Modified by Overlayer or Admixture of Zeolites Na - A , H - Y and H - ZSM - 5

A control thick-film SnO2 gas sensor was modified with zeolites holding LTA, FAU and MFI frameworks using two different approaches to integrate them into the gas-sensing interface. The objective was to prompt selectivity and sensitivity enhancements that were otherwise unattained with the unmodified material when detecting a range of hydrocarbon vapours with similar molecular structures and kin...