Potential Risk of NH3 Slip Arisen from Catalytic Inactive Site in Selective Catalytic Reduction of NOx with Metal-Free Carbon

Article Engineering, Environmental

Vehicular Emissions Enhanced Ammonia Concentrations in Winter Mornings: Insights from Diurnal Nitrogen Isotopic Signatures

Mengna Gu et al.

Summary: NH3 concentrations in winter mornings in urban Beijing are enhanced by vehicle emissions, which is a common phenomenon with significant diurnal variations.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2022)

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Article Engineering, Environmental

Rapid Increase in China's Industrial Ammonia Emissions: Evidence from Unit-Based Mapping

Yuang Chen et al.

Summary: Detailed estimates of industrial NH3 emissions in China are lacking, while emissions from cement production and coal-fired power plants have increased significantly in the past two decades. Unlike other major air pollutants, industrial NH3 emission control in China is still in a critical period.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2022)

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Article Engineering, Environmental

Insight into the enhancing activity and stability of Ce modified V2O5/AC during cyclic desulfurization-regeneration-denitrification

Qiaoyan Li et al.

Summary: Utilizing a Ce modified V2O5/AC catalyst, this study demonstrated that the desulfurization and denitrification activity improved with increasing regeneration cycles at the optimum temperature of 470 degrees C in N-2. Enhanced surface acidity and improved redox ability contributed to the catalytic activity of the regenerated catalysts, showing great potential for simultaneous SO2 and NOx removal in the steel industry.

JOURNAL OF HAZARDOUS MATERIALS (2022)

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Article Chemistry, Physical

Identification of Intrinsic Active Sites for the Selective Catalytic Reduction of Nitric Oxide on Metal-Free Carbon Catalysts via Selective Passivation

Jin Yuan et al.

Summary: This study identifies the nucleophilic ketonic carbonyl groups as the intrinsic active sites for NO reduction on metal-free carbon catalysts through experimental and computational methods. The mechanism of the SCR reaction involving a redox cycle of ketonic carbonyl/phenol pairs is revealed, and it demonstrates analogous features with vanadyl catalysts, potentially parallel the SCR mechanisms on metal-free carbon catalysts to transition-metal catalysts.

ACS CATALYSIS (2022)

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Article Engineering, Environmental

Insight into the Transformation Behaviors of Dioxins from SinteringFlue Gas in the Cyclic Thermal Regeneration by the V2O5/ACCatalyst-sorbent

Xiaoxiao Ding et al.

Summary: This study investigated the effects of cyclic regeneration on the removal of dioxins by a catalyst and found that the adsorption capacity and oxidation activity of the catalyst declined after multiple regeneration cycles. By modifying the regeneration process, the emission of dioxins can be reduced, and the transformation behavior of DBF was analyzed.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2022)

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Article Engineering, Environmental

Competitive Uptake of Dimethylamine and Trimethylamine against Ammonia on Acidic Particles in Marine Atmospheres

Dihui Chen et al.

Summary: Alkaline gases like NH3 and amines are important in neutralizing acidic particles in the atmosphere. This study found that the competition of DMA and NH3 on acidic aerosols follows thermodynamic equilibria and is sensitive to the DMA/NH3 molar ratio.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2022)

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Article Engineering, Environmental

Gas-to-Aerosol Phase Partitioning of Atmospheric Water-Soluble Organic Compounds at a Rural Site in China: An Enhancing Effect of NH3 on SOA Formation

Shaojun Lv et al.

Summary: This study investigates the partitioning process of water-soluble organic compounds (WSOC) and its impact on secondary organic aerosols (SOA) formation. The results show that WSOC primarily partitions to the organic phase during dry periods and to aerosol liquid water during humid periods. NH3 plays a crucial role in the formation of WSOC aerosols.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2022)

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Article Engineering, Chemical

Unravelling the functional complexity of oxygen-containing groups on carbon for the reduction of NO with NH3

Yuejin Li et al.

Summary: In this study, a series of carbon-based catalysts with different oxygen-containing groups were synthesized by oxidation for selective catalytic reduction of NO with NH3. Carboxyl and phenol groups on carbon materials were found to facilitate the denitrification performance. In addition, the formation of CO (NH4) and C(NO) on surface oxides was considered as significant steps for NO reduction with NH3.

JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS (2022)

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Article Chemistry, Physical

Assessing the Nature of Active Sites on Nanodiamonds as Metal-Free Catalysts for the EB-to-ST Direct Dehydrogenation Using a Catalytic Approach

Lu Feng et al.

Summary: Nanodiamonds show great promise as metal-free catalysts for alkane-to-alkene conversion, especially under oxygen-free direct dehydrogenation conditions, with the potential active sites being ortho-quinone groups at the edge of cubic-sp(3) NDs. Further studies are needed to fully understand the mechanism and nature of active sites in carbon catalysts for alkane steam-free DDH.

ACS CATALYSIS (2022)

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Review Engineering, Environmental

Multipollutant Control (MPC) of Flue Gas from Stationary Sources Using SCR Technology: A Critical Review

Dong Wang et al.

Summary: The emission of gaseous pollutants from fossil fuel combustion poses a serious environmental challenge, with the use of SCR systems to convert pollutants into harmless substances highlighted as a practical approach. However, developing catalysts suitable for large-scale commercialization remains challenging, and the efficiency of simultaneous elimination depends on catalyst composition and flue gas parameters.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2021)

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Article Multidisciplinary Sciences

Abating ammonia is more cost-effective than nitrogen oxides for mitigating PM2.5 air pollution

Baojing Gu et al.

Summary: The study shows that nitrogen contributes significantly to global PM2.5 exposure and has a substantial impact on global health. Controlling ammonia emissions has a lower cost compared to nitrogen oxides emissions, emphasizing the priority for reducing ammonia emissions.

SCIENCE (2021)

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Article Engineering, Environmental

Alkali-Resistant Catalytic Reduction of NOx by Using Ce-O-B Alkali-Capture Sites

Pan Zhang et al.

Summary: This study demonstrated alkali-resistant NOx reduction through the Ce-O-B structure and maintained efficient NH3 and NO adsorption/activation on K-poisoned catalysts.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2021)

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Article Green & Sustainable Science & Technology