Mesoporous ferrihydrite with incorporated manganese for rapid removal of organic contaminants in air.

Mesoporous ferrihydrite nanoparticles with incorporated Mn (MMnFh) were prepared for the first time, and MMnFh exhibits excellent performance in removing organic contaminants (CH(3)CHO and toluene) in air. The interesting physico-chemical properties and remarkable activity of MMnFh give great commercial potential in air purification application in diverse sectors.

Hydrothermal stability enhancement by sequential ion-exchange of rare earth metals on Fe/BEA zeolites used as NO reduction catalysts.

An addition of rare earth metals with trivalent cation radii of 1.05-1.15 Å to Fe/BEA zeolites improves hydrothermal stability for selective catalytic reduction of NO by NH(3).

Nanostructured ceria-silver synthesized in a one-pot redox reaction catalyzes carbon oxidation.

We introduce a new concept for a nanomaterial in terms of both synthesis and properties. The nanomaterial, aggregates of ceria particles around central silver metal (CeO(2)-Ag), was fabricated by a one-pot selective redox reaction using cerium(III) and silver(I) autocatalyzed by silver metal without the need for surfactants or organic compounds. This unique nanostructure is suitable as a catalyst, in contrast to core-shell materials wherein the shell deactivates the catalyst metal.

Analysis of the adsorption state and desorption kinetics of NO(2) over Fe-zeolite catalyst by FT-IR and temperature-programmed desorption.

States of NO(2) adsorption and kinetics of NO(2) desorption over a Fe-loaded ZSM-5 type zeolite were investigated using Fourier transform infrared (FT-IR) spectroscopy and temperature-programmed desorption (TPD). The FT-IR spectra in NO(2)/N(2) flows showed that several adsorption species (NO(2), nitrite, nitrate, and NO(+)) existed; except for NO(2), these were considered to be formed via NO(2) dimerization and disproportionation reactions. The TPD spectra showed two distinct peaks, a low-temperature (LT) peak that can be assigned to weakly adsorbed NO(x) in the zeolite channel and a high-temperature (HT) peak that can be assigned to chemisorbed NO(x) bonded to ion-exchanged Fe sites.

Quantitative analysis of transient surface reactions on planar catalyst with time-resolved time-of-flight mass spectrometry.

A procedure for the quantitative analysis of transient surface catalytic reactions in millisecond time resolution has been studied constructing a specially designed apparatus employing (1) pulsed-gas valves for the injection of reactant molecules onto catalysts and (2) a time-of-flight mass spectrometer (TOF-MS) to detect every reaction product simultaneously. For a better understanding of the catalytic activity and selectivity for products quantitatively, a procedure for measuring an amount of reactant molecules injected onto catalyst surface and calibrating the intensity of mass signal were proposed and implemented. We tested the applicability of this procedure for the quantitative analysis of products of NO+H(2) reaction on Pt-Al(2)O(3) catalysts (a planar catalyst: Pt-Al(2)O(3)Si substrates inserted into a micro-tube-reactor with SiC balls).