In Situ Preparation of Oxide-Based Supported Catalysts by Solution Combustion Synthesis

Abstract

The oxide-based supported catalysts with high specific surface area (>200 m(2)/g) were produced in one step through combination of the impregnation and solution combustion synthesis approaches. As a model system, iron oxide was selected, which was loaded on different porous supports including alpha-Al(2)O(3), gamma-Al(2)O(3), and ZrO(2), as well as activated alumina. It was shown that for the former three cases the specific surface areas of the supported catalysts are about or below the surface areas of the support. However, for the activated Al(2)O(3) this characteristic significantly increases compared to that of the support. It was demonstrated that the developed approach may be used to produce different types of oxide-based supported catalysts, including perovskites.

Perovskite-Based Catalysts for Direct Ethanol Fuel Cells

“…In general, in these systems the reactions under equilibrium conditions can be represented as follows: where Me ν is a metal with ν -valence, φ is a fuel to oxidizer ratio, φ =1 means that the initial mixture does not require atmospheric oxygen for complete oxidation of fuel, while φ>1 (<1) implies fuel-rich (lean) conditions. Different combustion modes, including Volume Combustion Synthesis (VCS), self-propagating Sol-Gel Combustion (SGC), and Impregnated Support Combustion (ISC) can be used to produce oxide powders with high specific surface area (21)(22)(23). In this work we utilized conventional VCS approach.…”

Continuous Suzuki-Miyaura Reactions with Novel Ce-Sn-Pd Oxides and Integrated Crystallization as Continuous Downstream Protocol

“…Using this method, palladium-substituted ceria and ceria composites can be synthesized at the gram scale, out of inexpensive precursors, in an easy and rapid manner (within a few hours) with standard laboratory equipment and without specialized working techniques. Furthermore, due to the homogeneous mixing of the catalyst precursors at the molecular level and the high combustion temperature (>900°C) [21], this method guarantees high crystallinity, high purity, large specific surface areas, and precise elemental and phase composition of the resulting mixed oxides [22]. Initially developed as catalysts for gas-phase oxidation reactions [23], catalysts of this type also proved to be highly active and reusable ligand-free catalysts for Heck-type C-C coupling reactions [24].…”

Historical perspective and contribution of US researchers into the field of self-propagating high-temperature synthesis (SHS)/combustion synthesis (CS): Personal reflections

“…The overall reaction process is very fast and results in the formation of nanograins exhibiting a high purity due to vaporization of all volatile species at high reaction temperatures generated by this exothermic reaction. Another important advantage of this method is a possibility of the formation of complex oxide nanop- owders for different applications as structural ceramics, catalysts, bio-or fuel cell materials [183][184][185][186][187][188].…”