Interaction between Nickel Oxide and Support Promotes Selective Catalytic Reduction of NO with C H.

Selective catalytic reduction of nitrogen oxides (NO ) with C H (C H -SCR) was investigated over NiO catalysts supported on different metal-oxides. A NiAlO mixed oxide phase was formed over NiO/γ-Al O catalyst, inducing an immediate interaction between NiO and AlO species. Such interaction resulted in a charge transfer from Ni to Al site and the formation of Ni species in high oxidation state.

New Insights on Competitive Adsorption of NO/SO on TiO Anatase for Photocatalytic NO Oxidation.

Here, we investigate competitive adsorption and photocatalytic reaction over TiO@SiO: NO conversion efficiency decreases by 29.1%, and the adsorption capacity decreases from 0.125 to 0.

Performance and Mechanism of Photocatalytic Toluene Degradation and Catalyst Regeneration by Thermal/UV Treatment.

This work presents a new strategy for industrial flue gas purification with TiO-based photocatalysis technology, which could be achieved by a novel dual-stage circulating photocatalytic reactor. A lab-scale fixed bed reactor is utilized to investigate the performance of photocatalytic toluene degradation and inactive catalyst regeneration by thermal/UV treatment. The relationships between operational conditions and toluene oxidation are surveyed and discussed in detail.

Roles of Oxygen Vacancies in the Bulk and Surface of CeO for Toluene Catalytic Combustion.

Catalytic combustion technology is one of the effective methods to remove VOCs such as toluene from industrial emissions. The decomposition of an aromatic ring via catalyst oxygen vacancies is usually the rate-determining step of toluene oxidation into CO. Series of CeO probe models were synthesized with different ratios of surface-to-bulk oxygen vacancies.

Heart-rate tuned comb filters for processing photoplethysmogram (PPG) signals in pulse oximetry.

Calculation of peripheral capillary oxygen saturation [Formula: see text] levels in humans is often made with a pulse oximeter, using photoplethysmography (PPG) waveforms. However, measurements of PPG waveforms are susceptible to motion noise due to subject and sensor movements. In this study, we compare two [Formula: see text]-level calculation techniques, and measure the effect of pre-filtering by a heart-rate tuned comb peak filter on their performance.

Cobalt Nanoparticles and Atomic Sites in Nitrogen-Doped Carbon Frameworks for Highly Sensitive Sensing of Hydrogen Peroxide.

In situ monitoring of hydrogen peroxide (H O ) during its production process is needed. Here, an electrochemical H O sensor with a wide linear current response range (concentration: 5 × 10 to 5 × 10 m), a low detection limit (32.4 × 10 m), and a high sensitivity (568.

Iron tungsten mixed composite as a robust oxygen evolution electrocatalyst.

We report a FeW mixed composite for oxygen evolution reaction with a low overpotential and a long-term stability. A structural transformation of FeW oxide occurs during the OER process. Theoretical calculation indicates that FeOx is the OER-active site and the neighboring WOx improves the *OH to *O conversion on the Fe site.

Adaptive Doppler analysis for robust handheld optical coherence elastography.

Optical coherence tomography (OCT) allows structural and functional imaging of biological tissue with high resolution and high speed. Optical coherence elastography (OCE), a functional extension of OCT, has been used to perform mechanical characterization. A handheld fiber-optic OCE instrument allows high sensitivity virtual palpation of tissue with great convenience and flexibility and can be used in a wide range of clinical settings.

Temporally and spatially adaptive Doppler analysis for robust handheld optical coherence elastography.

Optical coherence elastography (OCE), a functional extension of optical coherence tomography (OCT), can be used to characterize the mechanical properties of biological tissue. A handheld fiber-optic OCE instrument will allow the clinician to conveniently interrogate the localized mechanical properties of tissue, leading to better informed clinical decision making. During handheld OCE characterization, the handheld probe is used to compress the sample and the displacement of the sample is quantified by analyzing the OCT signals acquired.

New Insight into SO Poisoning and Regeneration of CeO-WO/TiO and VO-WO/TiO Catalysts for Low-Temperature NH-SCR.

In this study, the poisoning effects of SO on the VO-WO/TiO (1%VWTi) and CeO-WO/TiO (5%CeWTi) selective catalytic reduction (SCR) catalysts were investigated in the presence of steam, and also the regeneration of deactivated catalysts was studied. After pretreating the catalysts in a flow of NH + SO + HO + O at 200 °C for 24 h, it was observed that the low-temperature SCR (LT-SCR) activity decreased significantly over the 1%VWTi and 5%CeWTi catalysts. For 1%VWTi, NHHSO (ABS) was the main product detected after the poisoning process.

Impacts of Pb and SO Poisoning on CeO-WO/TiO-SiO SCR Catalyst.

A CeO-WO/TiO-SiO catalyst was employed to investigate the poisoning mechanisms of Pb and SO during selective catalytic reduction (SCR). The introduction of Pb and SO suppressed the catalytic performance by decreasing the numbers of surface acid and redox sites. Specifically, Pb preferentially bonded with amorphous WO species rather than with CeO, decreasing the numbers of both Lewis and Brønsted acid sites but exerting less influence on the reducibility.

Thin film transfer for the fabrication of tantalum nitride photoelectrodes with controllable layered structures for water splitting.

The fabrication of semiconductor films on conductive substrates is vital to the production of high-performance electrodes for photoelectrochemical (PEC) water splitting. In this work, a thin film transfer method was developed to produce TaN film photoanodes for PEC water oxidation. Phase-pure TaN thin films were formed on inert Si substrates magnetron sputtering of Ta films, followed by oxidation and subsequent nitridation in a flow of gaseous NH.

Scalable water splitting on particulate photocatalyst sheets with a solar-to-hydrogen energy conversion efficiency exceeding 1.

Photocatalytic water splitting using particulate semiconductors is a potentially scalable and economically feasible technology for converting solar energy into hydrogen. Z-scheme systems based on two-step photoexcitation of a hydrogen evolution photocatalyst (HEP) and an oxygen evolution photocatalyst (OEP) are suited to harvesting of sunlight because semiconductors with either water reduction or oxidation activity can be applied to the water splitting reaction. However, it is challenging to achieve efficient transfer of electrons between HEP and OEP particles.

Design strategies for P-containing fuels adaptable CeO2-MoO3 catalysts for DeNO(x): significance of phosphorus resistance and N2 selectivity.

Phosphorus compounds from flue gas have a significant deactivation effect on selective catalytic reduction (SCR) DeNOx catalysts. In this work, the effects of phosphorus over three catalysts (CeO2, CeO2-MoO3, and V2O5-MoO3/TiO2) for NH3-SCR were studied, and characterizations were performed aiming at a better understanding of the behavior and poisoning mechanism of phosphorus over SCR catalysts. The CeO2-MoO3 catalyst showed much better catalytic behavior with respect to resistance to phosphorus and N2 selectivity compared with V2O5-MoO3/TiO2 catalyst.

Improvement of activity and SO₂ tolerance of Sn-modified MnOx-CeO₂ catalysts for NH₃-SCR at low temperatures.

The performances of fresh and sulfated MnOx-CeO₂ catalysts for selective catalytic reduction of NOx by NH₃ (NH₃-SCR) in a low-temperature range (T < 300 °C) were investigated. Characterization of these catalysts aimed at elucidating the role of additive and the effect of sulfation. The catalyst having a Sn:Mn:Ce = 1:4:5 molar ratio showed the widest SCR activity improvement with near 100% NOx conversion at 110-230 °C.