Catalytic acetalization of carbonyl compounds over cation (Ce3+, Fe3+ and Al3+) exchanged montmorillonites and Ce3+-exchanged Y zeolites

Catalytic Oxidation of Methane into Methanol over Copper-Exchanged Zeolites with Oxygen at Low Temperature

The direct catalytic conversion of methane to liquid oxygenated compounds, such as methanol or dimethyl ether, at low temperature using molecular oxygen is a grand challenge in C-H activation that has never been met with synthetic, heterogeneous catalysts. We report the first demonstration of direct, catalytic oxidation of methane into methanol with molecular oxygen over copper-exchanged zeolit...

Selective catalytic reduction of nitric oxide by methane over cerium and silver ion-exchanged ZSM-5 zeolites

A new catalyst comprising cerium and silver ion-exchanged ZSM-5 zeolite is reported in this paper, for the reduction of nitric oxide by methane in the presence of excess oxygen. The bi-cation exchanged Ce-Ag-ZSM-5 catalyst was very active for this reaction, while either Ce-ZSM-5 or Ag-ZSM-5 alone showed low activity. The presence of oxygen in the feed gas mixture enhanced the activity of the ca...

Adsorption of Carbon Dioxide on Alkali Metal Exchanged Zeolites

Ion-Exchanged Binuclear Clusters As Active Sites of Selective Oxidation over Zeolites

A new catalytic oxidation cycle over binuclear Znand Ca-cation clusters in zeolites is proposed. Intermediate active clusters appear due to trapping of dioxygen. CO oxidation is considered as a model reaction over a cluster located in an 8-membered (8R) ring. Geometries of active clusters involved in the catalytic cycle vary depending on the nature and size of the cation. Reagents, transition s...

Towards a Better Understanding of Over Exchanged Metal Sorption onto Zeolites

LaTonia Belcher and Sarah Teren under the supervision of: John Regalbuto and Marc Schreier Department of Chemical Engineering University of Illinois at Chicago ______________________________________________________________________ ABSTRACT: Currently the procedure on how to make over exchanged Cu-ZSM-5 is well known and can be made at many different exchange rates [1]. However, no one understan...