The catalytic performance of Mo2N and K-Mo2N were assessed in hydrogenation of carbon monoxide in the reaction temperature range of 275–325 °C, 7 MPa and 60,000 h−1. The nitrides were synthesized via temperature-programmed treatment of ammonium heptamolybdate (AHM) and K-AHM precursors under c...

Preeclampsia (PE) is characterized by systemic maternal endothelial dysfunction. Changes in endothelial reactivity have been reported before the onset of clinical signs of PE, and continuing into the post-partum period. Women who smoke during pregnancy have a 33% reduced risk of developing PE. T...

Supported indium oxide catalysts are investigated for the CO2 hydrogenation to methanol at a total pressure of 40 bar (528-573 K) using a laboratory flow reactor. Surface reducibility, optical spectral characteristics, and catalytic rates and selectivity were correlated to catalyst composition. ...

A series of binary rare-earth metal silicides RE5Si3 and ternary boron-interstitial phases RE5Si3Bx (RE=Gd, Dy, Ho, Lu, and Y) adopting the Mn5Si3-type structure, have been prepared from the elemental components by arc melting. Boron “stuffed” phases were subsequently heated at 1750 K within a...

Quantitative low energy electron diffraction (LEED) studies have been carried out to determine the structure of the rare-earth germanide Ge(1 1 1)1×1–Dy and the rare-earth silicide Si(1 1 1)1×1–Dy. The analyses reveal structures similar to that of other rare-earth silicides previously studie...

The standard enthalpies of formation for some Holmium alloys in the binary systems HoX (where X  C, Si, Ge, B) have been determined by direct synthesis calorimetry at 1473±2 K. The following values of ΔH1α(298 K) kJ (mol of atoms)1 are reported: HoC2 = −28.6±1.2; HoSi = −80.9±2.2; HoSi2...

We report on the investigation of Si and Pd/Rh chemical environments using X-ray Absorption Near Edge Spectroscopy in two different families of rare earth silicides R2PdSi3 (R = Ce, Nd, Tb, Dy, Ho, Er) and HoRh2−xPdxSi2 (x = 0, 0.5, 0.75, 1.0, 1.5, 1.8, 2.0). The Si K, Pd L3 and Rh L3 absorption...

The Ho/Si(1 1 1)-1×1 and H–Ho/Si(1 1 1)-1×1 surfaces have been investigated by low energy electron diffraction I–V curve analysis. Several structural models have been tried and the optimum structure has been obtained using a combination of search methods. In the case of the Ho/Si(1 1 1) surf...

We have investigated the phase equilibria in the HoSi system over the entire range of alloy compositions. The phase digram has been established by means of differential thermal, X-ray and metallographic analyses. Seven intermetallic compounds have been found to exist in the system: Ho5Si3, Ho5...

The growth of holmium on the Si(1 1 1) surface in the sub-monolayer region was investigated using STM. Several metastable reconstructions, including 5 × 2 and (23×23)R30° were observed during the nucleation of the 1 × 1 2D rare earth (RE) silicide surface. The authors attempt to combine this...

The hydrogen sorption sites on the surface of holmium silicide grown on Si(1 1 1) have been determined using metastable de-excitation spectroscopy, ultraviolet photoemission spectroscopy and density functional theory calculations. Comparison of calculated and measured surface density of states s...

The chemical composition and the electronic properties of the n-InSb(1 0 0) surface treated with ammonium sulfide dissolved in water or in 2-propanol has been studied by X-ray photoemission spectroscopy. The solvent determines the mechanism of chemical reaction between InSb(1 0 0) surface and su...

The inhibitory effects of ammonium and sulfide on the methane production using acetate or propionate as a carbon source were investigated under different pH and temperature conditions. The methane production rate, duration of the lag phase, and inhibition threshold limit during methane productio...

Use of membraneless vaporization (MBL-VP) unit with two cone-shaped reservoirs is presented for on-line separation and detection of non-volatile species. A flow system comprising two sets of MBL-VP units with a single in-house capacitively coupled contactless conductivity detector (C4D) was deve...

Malachite is depressed during sulfidization flotation when excess sodium sulfide is added to it. Thus, this study investigated the role and mechanism of ammonium sulfate as a sulfidization promoter for eliminating the depression of excess S2− via micro-flotation experiments, X-ray photoelectron ...

In this contribution, we report on the impact of ammonium sulfide ((NH4)2Sx) chemical treatments done at room temperature on the surface properties of Cu2ZnSnSe4 (CZTSe) thin film. The first approach is based on the immersion of the absorber layer in a (NH4)2Sx solution (20 wt.%). This method re...

The activation mechanism of ammonium ions on the sulfidation of malachite (−201) was determined by density functional theory (DFT) calculations. Results of DFT calculations indicated that interlayer sulfidation occurs during the sulfidation process of malachite (−201). The absorption of both the...

Sulfidation-flotation is commonly performed to recover base metal oxide ores. Sulfidation could become the key process in recovering zinc from zinc oxide ores. We investigated the common zinc oxide mineral. An ammonium salt was used to enhance sulfidation-flotation of smithsonite. The effect of ...

In the present work, three different kinds of In2S3: hierarchical microspheres A, B and C (HMa, HMb and HMc), which were synthesized by a hydrothermal method in the sodium dodecyl sulfate-thiourea (SDS-thiourea) system. XRD, SEM and BET were used to characterize the prepared In2S3 materials. Com...

Dual oxygenases (DUOX) 1 and 2, expressed in many animal tissues, participate in host defense at mucosal surfaces and may have important signaling roles through generation of reactive oxygen. Present work addresses their expression in cultured human epidermal keratinocytes and effects of cytokin...