Nitrogen Dopant Induced Highly Selective and Durable CO Electroreduction into Formate on the InO Surface.

The inactive and unstable active sites limit the development of the electrochemical CO reduction reaction (CORR) under a large current density. Herein, nitrogen-doped InO was designed, which achieved a formate Faradaic efficiency (FE) of 97.6% with a formate partial current density () of 390.

Selective Recovery of Precious Metals from Wastes by Photochemical Tandem Dissolution in Fe(III) Oxalate-Halogen Systems.

Green selective metallurgy of precious metals (PMs) from industrial multimetal wastes is attracting more attention. Herein, a tandem dissolution strategy of Fe(III) oxalate complex (FOC)-halogen (I/Br) sequential system was put forward. FOC-I system was crucial for selective recovery, which was suitable for Pt dissolution but passivation for Pd recovery, while FOC-Br system was universal for platinum group metals (PGMs) dissolution.

Oxide Support Inert in Its Interaction with Metal but Active in Its Interaction with Oxide and Vice Versa.

Supported metal or oxide nanostructures catalyze many industrial reactions, where the interaction of metal or oxide overlayer with its support can have a substantial influence on catalytic performance. In this work, we show that small Pt species can be well stabilized on CeO under both H-containing and O-containing atmospheres but sintering happens on SiO, indicating that CeO is active whereas SiO is inert in Pt-support interaction. On the other hand, Co oxide (CoO) supported on SiO can maintain a low-valence Co state both in air and during CO hydrogenation to CO, indicating a strong interaction of CoO with SiO.

Spinel-Based Catalysts That Enable Catalytic Oxidation of Volatile Organic Compounds.

Volatile organic compounds (VOCs) have caused serious harm to human health and ecological environment, and have received much attention in recent years. Despite the successful applications of catalytic combustion of VOCs as the core technology of VOCs removal in industry, the development of efficient catalysts that can mineralize VOCs into nontoxic CO and HO at low temperatures remains a great challenge. Recent studies show that spinel-based materials as efficient catalysts were extensively used in the catalytic oxidation VOCs field due to their synergistic effect, manifold compositions, and electron configurations.

Co-doped cryptomelane-type manganese oxide in situ grown on a nickel foam substrate for high humidity ozone decomposition.

Monolithic catalysts with excellent O catalytic decomposition performance were prepared by in situ loading of Co-doped KMnO on the surface of nickel foam. The triple-layer structure with Co-doped KMnO/NiMnO/Ni foam was grown spontaneously on the surface of nickel foam by tuning the molar ratio of KMnO to Co(NO)·6HO precursors. Importantly, the formed NiMnO structure between KMnO and nickel foam during in situ synthesis process effectively protected nickel foam from further etching, which significantly enhanced the reaction stability of catalyst.

Local Electron Environment Regulation of Spinel CoMnO Induced Effective Reactant Adsorption and Transformation of Lattice Oxygen for Toluene Oxidation.

In contrast to numerous studies on oxygen species, the interaction of volatile organic compounds (VOCs) with oxides is also critical to the catalytic reaction but has hardly been considered. Herein, we develop a highly efficient Pt atom doped spinel CoMnO (Pt-CoMn) for oxidation of toluene at low temperature, and the toluene conversion rate increased by 18.3 times (129.

Enhancement of toluene oxidation performance over LaCoO perovskite by lanthanum non-stoichiometry.

LaCoO catalysts with different non-stoichiometry of lanthanum ions were synthesized by using the sol-gel method, and their catalytic performance in toluene combustion was investigated. The results showed that the catalytic activity and stability of A-site nonstoichiometric LaCoO were improved to a certain extent compared with pure LaCoO perovskite. Among them, the LaCoO catalyst gave the best catalytic performance for toluene oxidation.

Bifunctional zeolites-silver catalyst enabled tandem oxidation of formaldehyde at low temperatures.

Bifunctional catalysts with tandem processes have achieved great success in a wide range of important catalytic processes, however, this concept has hardly been applied in the elimination of volatile organic compounds. Herein, we designed a tandem bifunctional Zeolites-Silver catalyst that enormously boosted formaldehyde oxidation at low temperatures, and formaldehyde conversion increased by 50 times (100% versus 2%) at 70 °C compared to that of monofunctional supported silver catalyst. This is enabled by designing a bifunctional catalyst composed of acidic ZSM-5 zeolite and silver component, which provides two types of active sites with complementary functions.

Synergistic effects in Mn-Co mixed oxide supported on cordierite honeycomb for catalytic deep oxidation of VOCs.

A series of Co-Mn mixed oxide catalyst supported on a cordierite monolith was facilely synthesized by ultrasonic impregnation. Its catalytic performance was evaluated in the combustion of toluene, ethyl acetate and its mixture. It was observed that with incorporating Mn into CoO, the formation of solid solution with spinel structure could significantly improve the catalytic activity of pure phase CoO.

Effect of alkaline earth metal promoter on catalytic activity of MnO for the complete oxidation of toluene.

Herein, Na and Ca are introduced to MnO through cation-exchange method. The presence of Na and Ca significantly enhance the catalytic activity of MnO in toluene oxidation. Among them, the Ca-MnO catalyst exhibits the best catalytic activity (T = 194°C, T = 215°C, E = 57.

Promotion of NH-SCR activity by sulfate-modification over mesoporous Fe doped CeO catalyst: Structure and mechanism.

The mesoporous Fe doped CeO catalyst after modifying organic sulfate functional groups show an excellent activity with above 80% NO conversion in a temperature range of 250-450 °C. These organic-like sulfate groups bound to the Fe-O-Ce species leads to the strong electron interaction between Fe-O-Ce species and sulfate groups, which modifies the acidity and redox properties of catalyst. The strong ability of S˭O/S-O in sulfate groups to accommodate electrons from a basic molecule is a driving force in the generation of acidic properties, and thus promotes to produce new Brønsted acid sites.

Simultaneous cobalt(III)-histidine reduction and aerobic denitrification by Paracoccus versutus LYM.

Cobalt(II)-histidine [Co(II)His] is potentially a better alternative to ferrous complexes in the chemical absorption-biological reduction (CABR) flue gas denitrification process in view of its higher oxygenation reversibility. Though with excellent O-resistant ability, Co(II)His was still gradually oxidized into Co(III)His, losing NO binding capacity. Thus, Co(III)His biological reduction is an indispensable step in CABR process.

Tuning oxygen vacancy concentration of MnO through metal doping for improved toluene oxidation.

Oxygen vacancy acts an important role in adjusting the chemical properties of MnO. In this paper, two-dimensional MnO catalysts with different oxygen vacancy concentration are obtained by doping Cu. It is researched that the K species in the interlayer of birnessite-type MnO can be substituted during the Cu doping process.

Distribution of organophosphate esters between the gas phase and PM in urban Dalian, China.

We investigated the concentrations and seasonal variations of organophosphate esters (OPEs) in the gas phase and PM (particulate matter with an aerodynamic diameter <2.5 μm) in an urban area of Dalian, China, as well as their gas-particle partitioning. The total concentrations of OPEs in the gas phase were in the range of 0.

Effects of cobalt-histidine absorbent on aerobic denitrification by Paracoccus versutus LYM.

To overcome the problem that ferrous complexes are easily oxidized by O and then lose NO binding ability in the chemical absorption-biological reduction (CABR) process, cobalt(II)-histidine [Co(II)His] was proposed as an alternative. To evaluate the applicability of Co(II)His, the effects of CoHis absorbent on the aerobic denitrification by Paracoccus versutus LYM were investigated. Results indicated that His significantly promoted nitrite reduction.

Highly catalytic activity of Mn/SBA-15 catalysts for toluene combustion improved by adjusting the morphology of supports.

Rod-like, hexagonal and fiber-like SBA-15 mesoporous silicas were synthesized to support MnO for toluene oxidation. This study showed that the morphology of the supports greatly influenced the catalytic activity in toluene oxidation. MnO supported on rod-like SBA-15 (R-SBA-15) displayed the best catalytic activity and the conversion at 230°C reached more than 90%, which was higher than the other two catalysts.

Mechanistic Investigation into the Effect of Sulfuration on the FeW Catalysts for the Selective Catalytic Reduction of NO with NH.

Iron tungsten (FeW) catalyst is a potential candidate for the selective catalytic reduction (SCR) of NO with ammonia because of its excellent performance in a wide operating window. Sulfur poisoning effects in SCR catalysts have long been recognized as a challenge in development of efficient catalysts for applications. In this paper, the impact of sulfuration on catalyst structure, NH-SCR reaction performance and mechanism was systematically investigated through spectroscopic and temperature-programmed approaches.

Superior Performance of FeWO for the Selective Catalytic Reduction of NO with NH: Interaction between Fe and W.

Novel iron-tungsten catalysts were first developed for the selective catalytic reduction of NO by NH in diesel exhaust, achieving an excellent performance with a wide operating temperature window above 90% NO conversion from 225 or 250 to 450 °C (GHSVs of 30 000 or 50 000 h). It also exhibited a pronounced stability and relatively high NO conversion in the presence of HO, SO and CO. The introduction of W resulted in the formation of α-FeO and FeWO species obtained by HRTEM directly.

Highly dispersed Fe2O3 on carbon nanotubes for low-temperature selective catalytic reduction of NO with NH3.

Highly dispersed Fe2O3 nanoparticles supported on carbon nanotubes, prepared by a simple ethanol-assisted impregnation method, showed above 90% NO conversion and selectivity at low temperatures (200-325 °C). Moreover excellent durability and stability towards SO2/H2O was obtained.

Clickable periodic mesoporous organosilicas: synthesis, click reactions, and adsorption of antibiotics.

Pharmaceutical antibiotics are not easily removed from water by conventional water-treatment technologies and have been recognized as new emerging pollutants. Herein, we report the synthesis of clickable azido periodic mesoporous organosilicas (PMOs) and their use as adsorbents for the adsorption of antibiotics. Ethane-bridged PMOs, functionalized with azido groups at different densities, were synthesized by the co-condensation of 1,2-bis(trimethoxysilyl)ethane (BTME) and 3-azidopropyltrimethoxysilane (AzPTMS), in the presence of nonionic-surfactant triblock-copolymer P123, in an acidic medium.

Clickable SBA-15 to screen functional groups for adsorption of antibiotics.

Pharmaceutical antibiotics, as emerging contaminants, are usually composed of several functional groups that endow them with the ability to interact with adsorbents through different interactions. This makes the preparation of adsorbents tedious and time-consuming to screen appropriate functionalized materials. Herein, we describe the synthesis of clickable SBA-15 and demonstrate its feasibility as a screening material for the adsorption of antibiotics based on similar adsorption trends on materials with similar functional groups obtained by a click reaction and cocondensation/grafting methods.

The formation mechanism of Ag/SBA-15 nanocomposites prepared via in-situ pH-adjusting method.

In this paper, the mesostructures and formation mechanism of Ag/SBA-15 nanocomposites by in-situ "pH-adjusting" method were studied. Characterization results, such as X-ray powder diffraction, N2 adsorption-desorption isotherms and Transmission electron microscope, showed that the resultant materials exhibited highly ordered hexagonal mesoporous structures, which were strongly correlated to the pH values in the synthesis solution. The pH value also strongly affected the incorporation of silver nanoparticles into the channels.

Comparison of dynamic adsorption/desorption characteristics of toluene on different porous materials.

Four different types of adsorbents, SBA-15, MCM-41, NaY and SiO2, were used to study the dynamic adsorption/desorption of toluene. To further investigate the influence of pore structure on its adsorption performance, two SBA-15 samples with different microspores were also selected. It is shown that microporous material NaY has the largest adsorption capacity of 0.

[Preparation, characterization of Si doped TiO2 nanotubes and its application in photocatalytic oxidation of VOCs].

The Si-doped TiO2 nanotubes photocatalysts was synthesized by anodic oxidation method, which used Na2SiF6/HF as an electrolyte, and was characterized by means of SEM, XRD, DRS and EDX. TiO2 nanotubes composed of anatase phase and rutile phase, and Si was highly dispersed on the wall of TiO2 nanotubes. The photocatalytic activity of the Si-doped TiO2 nanotubes was investigated for photocatalytic degradation of gaseous toluene.