The growth of protective alumina scales in Al203-fonning alloys can be affected by the addition of reactive elements, such as Hf*"^, which has been considered one of the most effective dopants to slow down the scale growth rate. While a number of theories concerning the "reactive element effect" have been proposed, a full explanation of this phenomenon is not yet available. The overall objectiv...

Characterization by temperature-programmed reduction (TPR) • Alumina-supported nickel catalysts characterized temperature programmed reduction. The interactions between the support and metals have been studied. Several Ni-Pd Ni-Mo bimetallic various Ni-Mo-Pd trimetallic analyzed. order of impregnation is decisive in reducing properties. are used to facilitate many reactions at scales. However, ...

Graphene-encapsulated nickel nanoclusters are a feasible strategy to inhibit the deactivation of nickel-based catalysts. In this work, graphene-encapsulated catalysts (Ni@C/HZSM-5) were prepared by compression forming process, using pseudo-boehmite, Al2O3, and ZrO2 as binders. The pseudo-boehmite was gradually transformed from amorphous crystalline alumina at high temperatures, which destroyed ...

Mesoporous silica is a versatile material for energy, environmental, and medical applications. Here, the first time, we report flame aerosol synthesis method class of mesoporous with hollow structure specific surface area exceeding 1000 m 2 /g. We show its superior performance in water purification, drug carrier, thermal insulation. Moreover, propose general route to produce nanoshell supported...

The synthesis and analysis of inorganic material combinatorial libraries by a directed-sorting, split-pool bead method was demonstrated. Directed-sorting, split-pool, metal-loaded libraries were synthesized by adsorbing metal salts (H2PtCl6, SnCl2, CuCl2, and NiCl2) and metal standards (Pt, Cu, Ni in HCl) onto 2-mg porous gamma-alumina beads in 96- or 384-well plates. A matrix algorithm for the...

Preferential oxidation (PROX) of CO is the most efficient way to remove CO from reformate streams for PEM fuel cells. Pt/Al2O3 has long been used for this purpose. Pt/Al2O3 catalysts are effective for preferential oxidation of CO only at temperatures above 150°C, and the maximum CO conversion usually takes place at around 200°C. In this study, promotion of Pt/Al2O3 with transition metals result...

OBJECTIVES The aim of this study was to investigate the internal fit (IF) of glass-infiltrated alumina (ICA--In-Ceram Alumina), yttria-stabilized tetragonal zirconia polycrystals (Y-TZP--IPS e.max ZirCAD), and metal-ceramic (MC--Ni-Cr alloy) crowns. MATERIAL AND METHODS Sixty standardized resin-tooth replicas of a maxillary first molar were produced for crown placement and divided into 3 grou...