A type of novel mineral-derived catalyst (MDC) composed vanadium–titanium magnetite and sintering ore was prepared via calcination or acid modification for selective catalytic reduction nitrogen oxides (NOx) with ammonia (NH3) to reduce the production cost simplify preparation process. Characterizations by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectromet...

The catalytic pathway of cytochrome P450cam is studied by means of a hybrid quantum mechanics/molecular mechanics method. Our results reveal an active role of the enzyme in the different catalytic steps. The protein initially controls the energy gap between the high- and low-spin states in the substrate binding process, allowing thermodynamic reduction by putidaredoxin reductase and molecular o...

the catalytic oxidation of toluene over copper oxide supported on natural diatomite was investigated. the catalyst was prepared by the wet impregnation method and characterized by using the brunauer emmett teller (bet), field emission scanning electron microscopy (fesem), x-ray diffraction (xrd), x-ray fluorescence (xrf) and temperature-programmed reduction (tpr) analysis. the highest catalytic ...

Abstract In recent years, due to the installation of selective catalytic reduction (Selective Catalytic Reduction, hereinafter referred as SCR) devices, high temperature oxidation failure has occurred frequently in automobile exhaust systems. To explore its mechanism, this paper takes 439 ferritic stainless steel which is often used pipes an example and uses XRD, SEM, EDS experimental methods s...

Two-dimensional structure Au nanosheets with a polygon morphology and controlled thicknesses of ∼15 nm, ∼35 nm, and ∼50 nm were successfully synthesized by a one-step solution reduction method. Scanning and transmission electron microscopy (SEM and TEM), selected area electron diffraction (SEAD) analyses, and X-ray diffraction (XRD) were used to thoroughly study the structure and the formation ...

Objectives • Synthesize novel non-precious-metal electrocatalysts, with activity and stability similar to Pt, for the oxygen reduction reaction. – High activity toward oxygen reduction reaction – Mass production method – Corrosion resistance – Low cost • Improve understanding of the reaction mechanism of oxygen reduction on non-precious catalysts through: – Theoretical molecular modeling – Elec...