Removal Of Nitrogen Oxides Research Articles

A Short Review of Layered Double Oxide-Based Catalysts for NH3-SCR: Synthesis and NOx Removal

Nitrogen oxides are one of the main atmospheric pollutants and pose a threat to the ecological environment and human health. Selective catalytic reduction (NH3-SCR) is an effective way of removing nitrogen oxides, with the catalyst being the key to this technology. Two-dimensional nanostructured layered double oxide (LDO) has attracted increasing attention due to the controllability of cations in the layers and the exchangeability of anions between layers. As a derivative of layered double hydroxide (LDH), LDO not only inherits the controllability and diversity inherent in the LDH structure but also exhibits excellent performance in the catalytic field. This article contains three main sections. It begins with a brief discussion of the development of LDO catalysts and analyzes the advantages of the LDO structure. The later section introduces the synthesis methods of LDH, clarifies the conversion relationship between LDH and LDO, and summarizes the modification impacts of the properties of LDO catalysts. The application of LDO catalysts used in NH3-SCR under wild temperature conditions is discussed, and the different types, reaction processes, and mechanisms of LDO catalysts are described in the third section. Finally, future research directions and outlooks are also offered to assist the development of LDO catalysts and overcome the difficult points related to NH3-SCR.

TiO2 Surface Hybridisation with Ag and CuO for Solar‐Assisted Environmental Remediation and Sustainable Energy Applications

Industrialisation has led to unprecedented levels of outdoor air pollution, posing a significant health risk to human beings. Consequently, there is an urgent need to replace fossil fuels with sustainable energy sources, thereby mitigating these risks and providing a safer outdoor and indoor environment. Titanium dioxide is a versatile transition metal oxide with applications ranging from energy conversion to environmental remediation. However, it faces limitations, particularly in its absorption spectrum and charge separation efficiency, and enhancing these properties remains a significant challenge. In this research work, we have decorated the surface of TiO2 hybridising it with noble‐metal and/or noble‐metal oxides (Ag and/or CuO) to improve the photocatalytic performances (monitoring the removal of nitrogen oxides and benzene, and hydrogen generation from water splitting) under simulated solar‐light irradiation. Our results showed that titania modified with an Ag:Cu molar ratio equal to 1:1, not only exhibited the most promising performance in terms of nitrogen oxides and benzene removal, it was the optimum amount for the light‐induced generation of hydrogen from water splitting.

Research progress of Mn-based low-temperature SCR denitrification catalysts.

Selective catalytic reduction (SCR) is a efficiently nitrogen oxides removal technology from stationary source flue gases. Catalysts are key component in the technology, but currently face problems including poor low-temperature activity, narrow temperature windows, low selectivity, and susceptibility to water passivation and sulphur dioxide poisoning. To develop high-efficiency low-temperature denitrification activity catalyst, manganese-based catalysts have become a focal point of research globally for low-temperature SCR denitrification catalysts. This article investigates the denitrification efficiency of unsupported manganese-based catalysts, exploring the influence of oxidation valence, preparation method, crystallinity, crystal form, and morphology structure. It examines the catalytic performance of binary and multicomponent unsupported manganese-based catalysts, focusing on the use of transition metals and rare earth metals to modify manganese oxide. Furthermore, the synergistic effect of supported manganese-based catalysts is studied, considering metal oxides, molecular sieves, carbon materials, and other materials (composite carriers and inorganic non-metallic minerals) as supports. The reaction mechanism of low-temperature denitrification by manganese-based catalysts and the mechanism of sulphur dioxide/water poisoning are analysed in detail, and the development of practical and efficient manganese-based catalysts is considered.

Effect of chlorobenzene on the performance of NH3-SCR over Mn6Co4Ox catalyst

The simultaneous removal of nitrogen oxides (NOx) and volatile organic compounds (VOCs) in NH3-SCR units can simplify the flue gas treatment process and has great potential for economic and environmental benefits. Mn-based catalysts have shown excellent performance in NOx/chlorobenzene (CB) synergistic removal, however, the mechanism of CB influence on NH3-SCR is not clear till now. In this paper, the impact of CB on the performance of NH3-SCR over Mn6Co4Ox catalysts is investigated in detail. The findings demonstrate that while the presence of CB clearly inhibits the adsorption of NH3 and NO, the Cl-produced during CB breakdown can actually promote the adsorption of them. In addition, the emission of N2O and NO2 in the NH3-SCR reaction with CB participation was significantly reduced, and the N2 selectivity was significantly improved at the same time. The impact of CB on the NH3-SCR reaction pathway under 250 ℃ was explored using in situ DRIFT further. It showed that the NH3-SCR reaction on the Mn6Co4Ox catalyst was found to follow both the Eley − Rideal (E-R) and Langmuir − Hinshelwood (L-H) mechanisms. The presence of CB in the reaction accelerated the rate of the nitrate reaction, hindered the synthesis of M−NO2 nitro compounds, and enhanced the generation of the intermediate product-NH2 for the improvement of the NH3-SCR reaction. Conversely, the slow deactivation of the Mn6Co4Ox catalysts could be attributed to the by-products of CB decomposition and the unfavorable accumulation of MnClx or CoClx on the catalyst surface, which inhibited the NH3-SCR reaction.

Synergistic removal of NO and CO in industrial waste gas by Fe-modified Cu/TiO2 catalysts: The synergistic effect of metal oxides interaction

NH3-based selective catalytic reduction (NH3-SCR) combined with carbon monoxide (CO) catalytic oxidation is a productive way to synergistically remove nitrogen oxides (NOx) and CO from industrial waste gas. Catalyst is the undoubtedly centerpiece of the synergistic removal technology, which has aroused tremendous attention. Herein, in this investigation a variety of Cu/TiO2 catalysts modified by various metal oxides were prepared by impregnation method, and the excellent synergistic removal performance of Fe-modified Cu/TiO2 catalyst was observed. The Cu/TiO2 catalyst with a 7 wt% Fe doping amount exhibited the highest NO and CO removal efficiency (86 % for NO at 300 °C and over 98 % for CO from 300 ∼ 400 °C). Through a series of characterization techniques, it was discovered that Cu and Fe oxides interacted to evenly distribute them throughout the surface of TiO2 support, resulting in smaller particle size and abundant variable valence species (Cu+/Cu2+ and Fe2+/Fe3+) to enhance the redox performance of the catalysts. Moreover, the creation of additional surface chemisorbed oxygen, the adsorption of NO and CO, and the improvement of surface acidity were all facilitated by the electron transfer between various Cu and Fe species. In addition, in-situ diffuse reflectance infrared transform spectroscopy (in situ DRIFTS) results revealed the interaction between NH3-SCR and CO oxidation. This study proposes a viable approach to develop efficient catalysts for the synergistic removal of NO and CO in industrial applications.

Zeolite-promoted platinum catalyst for efficient reduction of nitrogen oxides with hydrogen

Internal combustion engine fueled by carbon-free hydrogen (H2-ICE) offers a promising alternative for sustainable transportation. Herein, we report a facile and universal strategy through the physical mixing of Pt catalyst with zeolites to significantly improve the catalytic performance in the selective catalytic reduction of nitrogen oxides (NOx) with H2 (H2-SCR), a process aiming at NOx removal from H2-ICE. Via the physical mixing of Pt/TiO2 with Y zeolite (Pt/TiO2 + Y), a remarkable enhancement of NOx reduction activity and N2 selectivity was simultaneously achieved. The incorporation of Y zeolite effectively captured the in-situ generated water, fostering a water-rich environment surrounding the Pt active sites. This environment weakened the NO adsorption while concurrently promoting the H2 activation, leading to the strikingly elevated H2-SCR activity and N2 selectivity on Pt/TiO2 + Y catalyst. This study provides a unique, easy and sustainable physical mixing approach to achieve proficient heterogeneous catalysis for environmental applications.

Mn–CeOx catalyst for the simultaneous removal of NOx, C6H6, and C7H8 at low temperatures: Experimental and DFT study

Coal-fired power plants are known for emitting substantial amounts of nitrogen oxides (NOx) and volatile organic compounds (VOCs) during operation. In this study, the utilization of Mn–CeOx catalysts for the simultaneous removal of these pollutants was explored. The catalysts were synthesized through the co-precipitation technique, and their material structure and active sites were analyzed through XRD, TEM, NH3-TPD, XPS, and in-situ DRIFTs characterization methodologies. The DFT calculations indicated that VOCs and NOx were efficiently adsorbed and activated on the catalyst surface and then converted into less harmful substances (CO2, N2, and H2O). Additionally, the potential reaction pathways occurring on the catalyst surface were investigated. Furthermore, the effectiveness of the Mn–CeOx catalyst in simultaneously reducing NOx and VOCs under low-temperature conditions was assessed. The experimental results validated the exceptional performance of the Mn–CeOx catalyst in eliminating both NOx and VOCs. Furthermore, the underlying mechanisms governing the catalytic process were comprehensively investigated.

Synergistic removal of nitrogen oxides and toluene and their interaction mechanism on Cu-MnO2 catalyst

Volatile organic compounds (VOCs) and nitrogen oxides (NOx) contribute significantly to the formation of haze and photochemical smog, posing substantial threats to both the environment and human health. Toluene, a typical VOCs, often coexists with NOx in various mobile or stationary flue gases. However, the current understanding of the mutual influence of their synergistic removal remains limited. In this work, the Cu-MnO2 catalyst was prepared using the precipitation method, which demonstrated synergistic removal activity for both NOx and toluene, as well as selectivity towards N2 and CO2. The interaction mechanism was investigated, particularly focusing on the effect of NOx on the adsorption and oxidation performance of toluene. The degree to which NOx inhibits toluene increases with NOx concentration. Furthermore, multiple inhibition ways of NOx on toluene oxidation were discovered, including competitive adsorption of NOx and toluene on the catalyst surface, as evidenced by the breakthrough experiments. TPD and XPS characterization indicated that the addition of NOx reduces oxygen vacancies, thereby weakening toluene oxidation performance. In addition, in-situ DRIFT characterization was conducted, and it was found that the addition of NOx affected the oxidation process of toluene. Apart from benzyl alcohol, benzaldehyde, and benzoic acid, intermediate nitrite species also appeared, and their deposition was also the reason for the decrease in toluene oxidation ability. This work provides new insights into the interaction mechanisms between various components in the collaborative removal of NOx and VOCs.

Enhanced photocatalytic removal of NOx through the synergistic effect of photothermal activation and bipyroelectricity

Photocatalysis provides a green and promising strategy for removing nitrogen oxides (NOx), one of the main pollutants in the atmosphere. However, few studies have been able to utilize the infrared portion of sunlight due to its low energy, which accounts for >50% of the total sunlight. The conversion of infrared light into heat is an effective but flawed approach for photocatalysis, because high temperature cannot only reduce the activation barrier of the reaction and improve the migration rate of charge carriers, but also increase the collision probability of photogenerated carriers. Here, C/PVDF-BaTiO3 (polyvinylidene fluoride, PVDF) photocatalytic films with bi-pyroelectric effect are designed to boost the full-spectrum solar photocatalytic conversion of NOx. During the photocatalytic reaction process, the photothermal conversion of carbon and the dual pyroelectricity synergistically enhance and reinforce each other’s effects. The 0.5 wt% C/PVDF-BaTiO3 film achieves a denitrification efficiency of 60% in a flow reaction, surpassing both the BaTiO3 and PVDF-BaTiO3 samples by 25% and 15% respectively.

Study on Ship Exhaust Gas Denitrification Technology Based on Vapor-Phase Oxidation and Liquid-Phase Impingement Absorption

A system combining gas-phase oxidation and liquid-phase collision absorption for removing NO from marine diesel engine exhaust was proposed. This method was the first to utilize different physical states of the same mixed solution to achieve both pre-oxidation and impingement reduction absorption of exhaust gases. During the pre-oxidation stage, a mixture of (NH4)2S2O8 and urea solution was atomized into a spray using an ultrasonic nebulizer to increase the contact area between the oxidant and the exhaust gas, thereby efficiently pre-oxidizing the exhaust gas in the gas phase. In the liquid-phase absorption stage, the (NH4)2S2O8 and urea solution was used in an impingement absorption process, which not only enhanced gas–liquid mass transfer efficiency but also effectively inhibited the formation of nitrates. Experimental results showed that, without increasing the amount of absorbent used, the maximum NO removal efficiency of this method reached 97% (temperature, 343 K; (NH4)2S2O8 concentration, 0.1 mol/L; urea concentration, 1.5 mol/L; NO concentration, 1000 ppm; pH, 7; impinging stream velocity, 15 m/s), compared to 72% using the conventional liquid-phase oxidation absorption method. Additionally, this method required only the addition of a nebulizer and two opposing nozzles to the existing desulfurization tower to achieve simultaneous removal of sulfur and nitrogen oxides from the exhaust gas, with low retrofitting costs making it favorable for practical engineering applications.

Engineering In-Co3O4/H-SSZ-39(OA) Catalyst for CH4-SCR of NOx: Mild Oxalic Acid (OA) Leaching and Co3O4 Modification.

Zeolite-based catalysts efficiently catalyze the selective catalytic reduction of NOx with methane (CH4-SCR) for the environmentally friendly removal of nitrogen oxides, but suffer severe deactivation in high-temperature SO2- and H2O-containing flue gas. In this work, SSZ-39 zeolite (AEI topology) with high hydrothermal stability is reported for preparing CH4-SCR catalysts. Mild acid leaching with oxalic acid (OA) not only modulates the Si/Al ratio of commercial SSZ-39 to a suitable value, but also removes some extra-framework Al atoms, introducing a small number of mesopores into the zeolite that alleviate diffusion limitation. Additional Co3O4 modification during indium exchange further enhances the catalytic activity of the resulting In-Co3O4/H-SSZ-39(OA). The optimized sample exhibits remarkable performance in CH4-SCR under a gas hourly space velocity (GHSV) of 24,000 h-1 and in the presence of 5 vol% H2O. Even under harsh SO2- and H2O-containing high-temperature conditions, it shows satisfactory stability. Catalysts containing Co3O4 components demonstrate much higher CH4 conversion. The strong mutual interaction between Co3O4 and Brønsted acid sites, confirmed by the temperature-programmed desorption of NO (NO-TPD), enables more stable NxOy species to be retained in In-Co3O4/H-SSZ-39(OA) to supply further reactions at high temperatures.

Facile preparation of Fe-Beta zeolite-supported transition metal oxide catalysts and their catalytic performance for the simultaneous removal of NOx and soot

Diesel engine exhaust comprises nitrogen oxides (NOx) and soot particles, which cause serious air pollution. However, owing to the contradictory nature of NOx reduction and soot oxidation, a trade-off exists in the simultaneous removal of NOx and soot. Consequently, catalytic technology has become a hot research topic. This study prepared MOδ/Fe-Beta (M=Fe, Co, Ni, Mn, Cu) catalysts through incipient wetness impregnation using Fe-Beta as the support and explored the catalytic performance of the above catalysts. The results exhibited the good performance of the prepared catalysts. The introduction of Mn resulted in a lower peak temperature of soot combustion for the catalyst, and slightly decreased deNOx performance of Fe-Beta. The soot combustion temperature was as low as 422 °C, and the temperature window for 80% NO conversion was 164–423 °C. The interaction between MnOδ and zeolite can regulate the acid sites and produce sufficient active oxygen species for the catalyst. The catalytic activity of the MnOδ/Fe-Beta catalyst is due to its strong redox property, appropriate number of acid sites and sufficient number of active oxygen species. In addition, the catalyst had good stability and water and sulfur resistance, therefore it had great potential for future application in simultaneous removal of NOx and soot from diesel engine exhaust.

Photocatalytic NOx removal and self-cleaning performance of polymeric carbon nitride functionalized alkali-activated slag composites

Alkali-activated slag (AAS) materials have been extensively investigated and employed for the photocatalytic coating incorporation due to their favorable binding property and low carbon emissions. However, the effects of photocatalysts on the microstructure and mechanical performance of AAS composites remain controversial, which have a significant impact on the durability of the photocatalytic composites in the real-life service environment. Herein, polymeric carbon nitride (PCN), as a metal-free photocatalyst, was mixed with AAS materials to prepare photocatalytic composites for nitrogen oxide (NOx) removal and surface self-cleaning. The PCN dosage effects on hydration products, microstructure, as well as mechanical and photocatalytic performances of the photocatalytic AAS composites were systematically studied. The results show that while hydration product formations are hindered by the PCN addition, its presence contributes to the carbonization of AAS composites. Additionally, due to the PCN microfiller effect, the microstructure of AAS composites is improved with the PCN addition, and the compressive strength of AAS composites becomes stronger as PCN dosage increases from 0 % to 6 %. The photocatalytic NOx removal and self-cleaning performances of PCN-added AAS composites are firstly increased and then decreased with the PCN addition. These findings provide the theoretical basis and technical support for PCN-added AAS composites application which satisfies the requirement for a sustainable and low carbon footprint future.

2D Bismuth-Based Nanomaterials for Photocatalytic Nitrogen Oxide Removal: Progress and Prospects

2D Bismuth-Based Nanomaterials for Photocatalytic Nitrogen Oxide Removal: Progress and Prospects

Optimization Analysis of Various Parameters Based on Response Surface Methodology for Enhancing NOx Catalytic Reduction Performance of Urea Selective Catalytic Reduction on Cu-ZSM-13 Catalyst

While selective catalytic reduction (SCR) has long been indispensable for nitrogen oxide (NOx) removal, optimizing its performance remains a significant challenge. This study investigates the combined effects of structural and intake parameters on SCR performance, an aspect often overlooked in previous research. This paper innovatively developed a three-dimensional SCR channel model and employed response surface methodology to conduct an in-depth analysis of multiple key factors. This multidimensional, multi-method approach enables a more comprehensive understanding of SCR system mechanics. Through target optimization, we achieved a simultaneous improvement in three critical indicators: the NOx conversion rate, pressure drop, and ammonia slip. It is worth noting that the NOx conversion rate has been optimized from 17.07% to 98.25%, the pressure drop has been increased from 3454.62 Pa to 2558.74 Pa, and the NH3 slip has been transformed from 122.26 ppm to 17.49 ppm. These results not only advance the theoretical understanding of SCR technology but also provide valuable design insights for practical applications. Our findings pave the way for the development of more efficient and environmentally friendly SCR systems, potentially revolutionizing NOx control in various industries.

Particulate removal characteristics of commercial-scale DeNOx catalyst cartridge coupled filter bags

The commercial-scale DeNOx catalyst cartridge coupled with filter bag have been developed for the removal of fine particulate matter and nitrogen oxides (NOx) in flue gases. The DeNOx catalyst cartridge coupled filter bag is made up of a microporous PTFE (polytetrafluoroethylene) membrane/impregnated polyimide fiber needle-punched pleated filter bag designed for the removal of ultrafine particulates, along with a pellet selective catalytic reduction catalyst-filled cartridge for the removal of NOx. V2O5-MoO3/TiO2 catalyst was used as the DeNOx catalyst. The distribution of cleaning air velocity inside the DeNOx catalyst cartridge-coupled filter bag, which is injected with compressed air from the high-volume low-pressure (HVLP) pulse injector to remove the deposited dust cake from the surface of the filter bags during pulse-jet cleaning, was confirmed using computational fluid dynamics (CFD). The particulate removal and dust cake dislodgement characteristics of the DeNOx catalyst cartridge coupled filter bag were tested in a commercial-scale filter bag test unit under conditions simulating fossil fuel combustion flue gas. The commercial-scale DeNOx catalyst cartridge coupled filter bag was 165 mm in diameter, 2000 mm in total length, and contained approximately 12 kg of DeNOx catalyst- filled cartridges. Nine commercial-scale DeNOx catalyst cartridge coupled filter bags were installed in the commercial-scale filter test unit. The experimental conditions were as follows: flue gas temperature 200 °C, flue gas flow rate 3000Nm3/h, NO, SO2, and particulate concentration in inflow flue gas 200 ppm, 7 ppm, and 5000 mg/Nm3 respectively, resulting in different values of filtration velocities. The efficiency of bag cleaning and intervals, overall collection efficiency, fractional efficiency, and filter quality were investigated. The average bag cleaning efficiency and overall collection efficiency were 95.5%, 91.5%, and 83.3% at filtration velocities of 0.8, 1.0 and 1.2 m/min, respectively. The corresponding values for overall collection efficiency were 99.9%, 99.5%, and 98.2%. So, both bag cleaning efficiency and overall collection efficiency decreased with increased filtration velocity. The present study confirmed that DeNOx catalyst cartridge coupled filter bags have relatively higher bag cleaning efficiency, collection efficiency, and filter quality for challenging fossil fuel combustion flue gas. Particularly, the fractional efficiency for micron-sized particles was considerably higher at lower filtration velocities.

Nitrogen oxides removal from hydrogen flue gas using corona discharge in marine boilers: Application perspective

This paper focuses on the combustion of hydrogen in boilers, as it appears to be a more effective method than using fuel cells for heating purposes due to higher boiler efficiency. One of the main disadvantages of hydrogen combustion in air is NOx formation. Therefore, the authors decided to introduce corona discharge as an innovative technique to clean hydrogen flue gas by effectively reducing NOx levels. The method involves generating positive plasma at atmospheric pressure by applying up to a 23 kV voltage difference between rod and ring-shaped electrodes. Experimental studies have shown that corona discharge can significantly lower the concentrations of NO and NOx in exhaust gases. The maximum DeNOx level was found to be 32.3%, while the plasma generator uses 17.5% of the power contained in burned hydrogen. The findings suggest that this technology holds potential for application in industrial hydrogen combustion systems, offering an environmentally friendly alternative to conventional NOx reduction methods.

Study on the Catalytic Activity Modification of Pr and Nd Doped Ce0.7Zr0.3O2 Catalysts for Simultaneous Removal of PM and NOX

Cerium-zirconium composite oxides (Ce0.7Zr0.3O2) have a remarkable effect on catalytic removal of carbon particles (PM) and nitrogen oxides (NOX) emitted from diesel engine, in order to further improve the thermal stability, oxygen storage capacity and low temperature catalytic REDOX performance of cerium zirconium composite oxides (Ce0.7Zr0.3O2), a small amount of Pr and Nd rare earth elements are doped to improve the catalytic activity of cerium zirconium composite oxides. In this paper, the composite oxide of Pr6O11–Nd2O3–CeO2–ZrO2 is prepared by unsteady co-precipitation method, and the physicochemical properties of the composite oxide catalyst are analyzed by BET, SEM, XRD and ICP. The gas adsorption capacity and catalytic activity of composite oxide catalysts are measured by temperature programmed reaction technology (TPR). The results show that the composite oxide of Pr0.05Nd0.05Ce0.6Zr0.3O2 prepared by using rare earth elements Pr and Nd inhibits the growth process of grain, refining the grain, and improving the sintering phenomenon at high temperature. The addition of Pr and Nd causes lattice defects, increases the number of oxygen vacancies, and improves the mobility of lattice oxygen, namely promotes oxide oxygen storage property, gas adsorption and catalytic oxidation reduction ability. After modification, Pr0.05Nd0.05Ce0.6Zr0.3O2 has good resistance to high temperature aging performance, prolongs the service life, reduces the PM lowest ignition temperature and minimum catalytic activity temperature of nitrogen oxide, and promotes the NOX reduction rate. For Pr0.05Nd0.05Ce0.6Zr0.3O2, the lowest ignition temperature of PM is about 150 °C, and the lowest catalytic activity temperature of NO is about 130 °C. The maximum CO2 production rate is 68.3%, and the maximum NO reduction rate is 45%.

Hemispherical scale mechanisms of nitrate formation in global marine aerosols

Nitrogen oxides (NOx) in the atmosphere directly affect air quality; however, their oxidation products (e.g., nitrate) are essential nutrients in terrestrial and marine ecosystems. To date, the mechanism and rate of nitrate formation in the global-scale marine boundary layer remains uncertain. Herein, aerosol nitrate isotopes covering the global ocean were analysed and observations indicated that nitrate formation was dominated by the proportion between the hydroxyl radical (daytime) and ozone (nighttime) pathways in the Northern Hemisphere (NH), whereas it changed to the BrO (Antarctic iceberg emission) pathway in the Southern Hemisphere (SH). These differences in the pathways suggested that the NOx removal (nitrate formation) efficiency was higher in the NH, which could be responsible for the much higher nitrate concentrations in the NH than in the SH (over twice). This study can assist in formulating effective policies to mitigate global NOx pollution and improve our understanding of the impact of increasing NOx concentrations on global ocean productivity.

Synergistic Catalytic Removal of NOx and n-Butylamine via Spatially Separated Cooperative Sites.

Synergistic control of nitrogen oxides (NOx) and nitrogen-containing volatile organic compounds (NVOCs) from industrial furnaces is necessary. Generally, the elimination of n-butylamine (n-B), a typical pollutant of NVOCs, requires a catalyst with sufficient redox ability. This process induces the production of nitrogen-containing byproducts (NO, NO2, N2O), leading to lower N2 selectivity of NH3 selective catalytic reduction of NOx (NH3-SCR). Here, synergistic catalytic removal of NOx and n-B via spatially separated cooperative sites was originally demonstrated. Specifically, titania nanotubes supported CuOx-CeO2 (CuCe-TiO2 NTs) catalysts with spatially separated cooperative sites were creatively developed, which showed a broader active temperature window from 180 to 340 °C, with over 90% NOx conversion, 85% n-B conversion, and 90% N2 selectivity. A synergistic effect of the Cu and Ce sites was found. The catalytic oxidation of n-B mainly occurred at the Cu sites inside the tube, which ensured the regular occurrence of the NH3-SCR reaction on the outer Ce sites under the matching temperature window. In addition, the n-B oxidation would produce abundant intermediate NH2*, which could act as an extra reductant to promote NH3-SCR. Meanwhile, NH3-SCR could simultaneously remove the possible NOx byproducts of n-B decomposition. This novel strategy of constructing cooperative sites provides a distinct pathway for promoting the synergistic removal of n-B and NOx.