Synergistic Catalytic Removal of NO and -Butylamine via Spatially Separated Cooperative Sites.

Synergistic control of nitrogen oxides (NO) and nitrogen-containing volatile organic compounds (NVOCs) from industrial furnaces is necessary. Generally, the elimination of -butylamine (-B), a typical pollutant of NVOCs, requires a catalyst with sufficient redox ability. This process induces the production of nitrogen-containing byproducts (NO, NO, NO), leading to lower N selectivity of NH selective catalytic reduction of NO (NH-SCR).

Phosphotungstic Acid as a Dechlorination Agent Collaborates with CeO for Synergistic Catalytic Elimination of NO and Chlorobenzene.

The development of efficient technologies for the synergistic catalytic elimination of NO and chlorinated volatile organic compounds (CVOCs) remains challenging. Chlorine species from CVOCs are prone to catalyst poisoning, which increases the degradation temperature of CVOCs and fails to balance the selective catalytic reduction of NO with the NH (NH-SCR) performance. Herein, synergistic catalytic elimination of NO and chlorobenzene has been originally demonstrated by using phosphotungstic acid (HPW) as a dechlorination agent to collaborate with CeO.

Synergistic catalytic removal of NO and chlorinated organics through the cooperation of different active sites.

The synergistic removal of NO and chlorinated volatile organic compounds (CVOCs) has become the hot topic in the field of environmental catalysis. However, due to the trade-off effects between catalytic reduction of NO and catalytic oxidation of CVOCs, it is indispensable to achieve well-matched redox property and acidity. Herein, synergistic catalytic removal of NO and chlorobenzene (CB, as the model of CVOCs) has been originally demonstrated over a Co-doped SmMnO mullite catalyst.

Revealing the Dynamic Behavior of Active Sites on Acid-Functionalized CeO Catalysts for NO Reduction.

Unraveling the dynamics of the active sites upon CeO-based catalysts in selective catalytic reduction of nitrogen oxides by ammonia (NH-SCR) is challenging. In this work, we prepared tungsten-acidified and sulfated CeO catalysts and used operando spectroscopy to reveal the dynamics of acid sites and redox sites on catalysts during NH-SCR reaction. We found that both Lewis and Brønsted acid sites are needed to participate in the catalytic reaction.

Improved N Selectivity of MnO Catalysts for NO Reduction by Engineering Bridged Mn Sites.

Mn-based catalysts are promising for selective catalytic reduction (SCR) of NO with NH at low temperatures due to their excellent redox capacity. However, the N selectivity of Mn-based catalysts is an urgent problem for practical application owing to excessive oxidizability. To solve this issue, we report a Mn-based catalyst using amorphous ZrTiO as the support (Mn/ZrTi-A) with both excellent low-temperature NO conversion and N selectivity.

Sandwich-Type Electrochemiluminescence Immunosensor Based on CDs@dSiO Nanoparticles as Nanoprobe and Co-Reactant.

In general, co-reactants are essential in highly efficient electrochemiluminescence (ECL) systems. Traditional co-reactants are usually toxic, so it is necessary to develop new environmentally friendly co-reactants. In this work, carbon dots (CDs) were assembled with dendritic silica nanospheres (CDs@dSiO NPs) to form a co-reactant of Ru(bpy).

Balancing acid and redox sites of phosphorylated CeO catalysts for NO reduction: The promoting and inhibiting mechanism of phosphorus.

The role of phosphorus in metal oxide catalysts is still controversial. The precise tuning of the acidic and redox properties of metal oxide catalysts for the selective catalytic reduction in NO using NH is also a great challenge. Herein, CeO catalysts with different degrees of phosphorylation were used to study the balance between the acidity and redox property by promoting and inhibiting effects of phosphorus.

NO Reduction over Smart Catalysts with Self-Created Targeted Antipoisoning Sites.

Selective catalytic reduction of NO in the presence of alkali (earth) metals and heavy metals is still a challenge due to the easy deactivation of catalysts. Herein, NO reduction over smart catalysts with self-created targeted antipoisoning sites is originally demonstrated. The smart catalyst consisted of TiO pillared montmorillonite with abundant cation exchange sites to anchor poisoning substances and active components to catalyze NO into N.

Synergistic Catalytic Elimination of NO and Chlorinated Organics: Cooperation of Acid Sites.

The synergistic catalytic removal of NO and chlorinated volatile organic compounds under low temperatures is still a big challenge. Generally, degradation of chlorinated organics demands sufficient redox ability, which leads to low N selectivity in the selective catalytic reduction of NO by NH (NH-SCR). Herein, mediating acid sites introducing the CePO component into MnO/TiO NH-SCR catalysts was found to be an effective approach for promoting chlorobenzene degradation.

Mesoporous N-P Codoped Carbon Nanosheets as Superior Cathodic Catalysts of Neutral Metal-Air Batteries.

Development of high-efficiency oxygen reduction reaction (ORR) catalysts under neutral conditions has made little research progress. In this work, we synthesized a three-dimensional porous N/P codoped carbon nanosheet composites (CNP@PNS) by high-temperature thermal treatment of dicyandiamide, starch, and triphenylphosphine and subsequent porous structure-making treatment using the NaCl molten salt template. In the neutral solution, the electrocatalytic performance of the CNP@PNS-4 catalyst exhibits an onset potential of 0.

CoNi Nanoparticles Supported on N-Doped Bifunctional Hollow Carbon Composites as High-Performance ORR/OER Catalysts for Rechargeable Zn-Air Batteries.

Searching for high-quality air electrode catalysts is the long-term goal for the practical application of Zn-air batteries. Here, a series of coexistent composite materials (CoNi/NHCS-TUC-) of cobalt-nickel supported on nitrogen-doped hollow spherical carbon and tubular carbon are obtained using a simple pyrolysis strategy. Co and Ni in the composites are mainly present in the form of alloy nanoparticles, M-N and M-C (M = Co or Ni) species, with high oxygen reduction reaction (ORR)/oxygen evolution reaction (OER) electroactivity.

Alkali-Resistant Catalytic Reduction of NO by Using Ce-O-B Alkali-Capture Sites.

Reducing the poisoning effect arising from alkali metals over catalysts for selective catalytic reduction (SCR) of NO by NH is still an urgent issue to be solved. Herein, alkali-resistant NO reduction over B-doped CeO/TiO catalysts (Ce-B/TiO) with Ce-O-B alkali-capture sites was originally demonstrated. It was noted that boron was confirmed to be doped into the lattice of CeO to form the Ce-O-B structure.

Highly efficient electroconversion of carbon dioxide into hydrocarbons by cathodized copper-organic frameworks.

Highly selective conversion of carbon dioxide (CO) into valuable hydrocarbons is promising yet challenging in developing effective electrocatalysts. Herein, Cu/adeninato/carboxylato metal-biomolecule frameworks (Cu/ade-MOFs) are employed for efficient CO electro-conversion towards hydrocarbon generation. The cathodized Cu/ade-MOF nanosheets demonstrate excellent catalytic performance for CO conversion into valuable hydrocarbons with a total hydrocarbon faradaic efficiency (FE) of over 73%.

Stabilized gold nanoparticles on ceria nanorods by strong interfacial anchoring.

Au/CeO(2) catalysts are highly active for low-temperature CO oxidation and water-gas shift reaction, but they deactivate rapidly because of sintering of gold nanoparticles, linked to the collapse or restructuring of the gold-ceria interfacial perimeters. To date, a detailed atomic-level insight into the restructuring of the active gold-ceria interfaces is still lacking. Here, we report that gold particles of 2-4 nm size, strongly anchored onto rod-shaped CeO(2), are not only highly active but also distinctively stable under realistic reaction conditions.