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学者姓名：朱娜
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Abstract ：
Cu-SSZ-39 has garnered significant attention because of its outstanding NH3-SCR activity and hydrothermal stability. To facilitate commercial application of Cu-SSZ-39, it is crucial to streamline the synthesis process, adopt eco-friendly synthesis methods, enhance the catalytic performance, and explore the underlying catalytic mechanisms. Herein, ammonia exchange was skipped and Cu-SSZ-39 was directly synthesized via Cu-exchange of Na-SSZ-39. This approach yielded a Cu-SSZ-39 with superior catalytic performance compared to that prepared using the conventional NH4-SSZ-39. Comparative characterization of the Cu-SSZ-39 catalysts, derived from both Na-SSZ-39 and NH4-SSZ-39 exchanges demonstrated that the positioning of Na cations affected Cu distribution, and controlling Na distribution can enhance deNOx activity. It was also found that while cation locations did not alter the reaction mechanism of Cu-SSZ-39 at low temperature, they did increase the concentration of active NOx intermediates, thereby boosting catalytic performance. This study facilitates a more sustainable synthesis of CuSSZ-39 and provides deeper insights into how cations' distribution in zeolites affects catalytic efficiency.
Keyword ：
Cu distribution Cu distribution Cu-SSZ-39 Cu-SSZ-39 Na locations Na locations NH3-SCR NH3-SCR
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| GB/T 7714 | Zhu, Na , Yu, Lingyu , Hou, Lisen et al. Insight into the role of Na distribution in Cu-SSZ-39 catalysts [J]. | JOURNAL OF CATALYSIS , 2025 , 445 . |
| MLA | Zhu, Na et al. "Insight into the role of Na distribution in Cu-SSZ-39 catalysts" . | JOURNAL OF CATALYSIS 445 (2025) . |
| APA | Zhu, Na , Yu, Lingyu , Hou, Lisen , Wang, Siying . Insight into the role of Na distribution in Cu-SSZ-39 catalysts . | JOURNAL OF CATALYSIS , 2025 , 445 . |
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The distinct impact of Na on the NH3-SCR activity of Cu-based Beta zeolites was explored by incorporating Cu onto Na and H-type Beta zeolites via ion-exchange and impregnation methods. The characterization results revealed that an appropriate amount of Na facilitated the exchange of Cu ions into the Beta zeolites, leading to enhanced acidity and NOx adsorption properties. The CuNa-Beta catalysts obtained through ion-exchange, exhibited decreased NH3 oxidation activity at elevated temperatures while demonstrated enhanced NO oxidation activity at lower temperatures, resulting in the improved NOx conversion. However, when the Cu loading was conducted by the impregnation method, Na remained in the Cu/Beta zeolites caused the transformation of Cu to CuOx, resulting in the inferior NH3-SCR performance. These findings demonstrated the significant influence of co-cation Na and preparation methods on Cu locations and NH3-SCR performance of Cu-based Beta zeolites.
Keyword ：
Alkali metals Alkali metals Cu-Beta Cu-Beta Preparation methods Preparation methods Selective catalytic reduction Selective catalytic reduction
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| GB/T 7714 | Hou, Lisen , Zhu, Na , Xu, Lichang et al. Distinct effects of Na on Cu-based Beta zeolites for the selective catalytic reduction of NOx with NH3 [J]. | MOLECULAR CATALYSIS , 2024 , 557 . |
| MLA | Hou, Lisen et al. "Distinct effects of Na on Cu-based Beta zeolites for the selective catalytic reduction of NOx with NH3" . | MOLECULAR CATALYSIS 557 (2024) . |
| APA | Hou, Lisen , Zhu, Na , Xu, Lichang , Yu, Lingyu . Distinct effects of Na on Cu-based Beta zeolites for the selective catalytic reduction of NOx with NH3 . | MOLECULAR CATALYSIS , 2024 , 557 . |
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The disposal of discarded vulcanized natural rubber waste has presented substantial environmental challenges. This study aimed to investigate the degradation of vulcanized natural rubber through the utilization of enriched bacterial consortia with NRE3 derived from the soil. The highest weight loss of 38.84 % was achieved with NRE3 after four weeks of incubation. Additionally, the crosslinking density of rubber decreased by 32.3 % and the tensile strength decreased from 69.1 to 9.5 MPa. SEM analysis revealed the presence of significant cracks and holes on the surface of vulcanized natural rubber. Moreover, FT-IR and XPS analyses demonstrated a decrease in the sulfur (S) and carbon (C) content of the rubber, while the oxygen (O) content increased. The concentration of SO42- in the medium increased from 478.37 to 840.26 mg/L, indicating the collapse of the rubber structure. The NMR and GC-MS findings indicated the presence of degradation products, specifically polyisoprene oligomers and terpenoids. Through high-throughput sequencing analyses, Acinetobacter, Chryseobacterium, Stenotrophomonas and other bacterial were discovered in NRE3. Based on the chemical structure characterizations and molecular analyses, a degradation pathway was proposed. These findings pave a way for utilizing rubberdegrading microorganisms present in soil and contribute to the establishment of a biodegradation method for disposing of vulcanized rubber waste.
Keyword ：
Bacterial consortia Bacterial consortia Biodegradation Biodegradation Degradation pathway Degradation pathway Devulcanization rubber Devulcanization rubber
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| GB/T 7714 | Cheng, Yangjian , Wei, Yanchen , Wu, Hongliang et al. Biodegradation of vulcanized natural rubber by enriched bacterial consortia [J]. | CHEMICAL ENGINEERING JOURNAL , 2024 , 481 . |
| MLA | Cheng, Yangjian et al. "Biodegradation of vulcanized natural rubber by enriched bacterial consortia" . | CHEMICAL ENGINEERING JOURNAL 481 (2024) . |
| APA | Cheng, Yangjian , Wei, Yanchen , Wu, Hongliang , Zhang, Tingting , Li, Shihua , Zhu, Na et al. Biodegradation of vulcanized natural rubber by enriched bacterial consortia . | CHEMICAL ENGINEERING JOURNAL , 2024 , 481 . |
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Nitrogen oxides (NOx) and chlorobenzene (CB) released during waste incineration and iron ore sintering pose significant threats to both the atmosphere and human health, necessitating effective control measures. Vanadium-based catalysts are commonly employed for the simultaneous control of NOx and CB; however, their catalytic performance requires further enhancement. In this study, the NH3-SCR activity and CB catalytic oxidation (CBCO) activity were significantly enhanced by doping the V10W/Ti catalyst with Ce. During the multi-pollutant control (MPC) reaction, the optimized 15CeV10W/Ti catalyst demonstrated NOx conversion approaching 100% and N-2 selectivity exceeding 95% at temperatures between 210 and 450 degrees C. Additionally, it achieved CB conversion nearing 100% and CO2 selectivity above 80% at temperatures above 350 degrees C. These results were markedly superior to those of the conventional commercial 1%V2O5-10%WO3/TiO2 catalyst. Characterization studies indicated that the 15CeV10W/Ti catalyst possessed improved redox performance and more acidic sites. In the MPC reaction, the declined CBCO activity, compared to the CB separate oxidation, can be attributed primarily to the competitive adsorption of NH3 with CB. Conversely, the observed decrease in NOx conversion at lower temperatures was primarily due to the suppression of the oxidation of NO to NO2 by CB.
Keyword ：
catalytic oxidation catalytic oxidation Ce doping Ce doping NH3-SCR NH3-SCR product selectivity product selectivity vanadium-based catalysts vanadium-based catalysts
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| GB/T 7714 | Zhu, Na , Yu, Lingyu , Xu, Pengpeng et al. Enhanced Performance of Ce Doping VW/Ti Catalysts for Synergistic Catalytic Removal of NOx and Chlorobenzene [J]. | CATALYSTS , 2024 , 14 (12) . |
| MLA | Zhu, Na et al. "Enhanced Performance of Ce Doping VW/Ti Catalysts for Synergistic Catalytic Removal of NOx and Chlorobenzene" . | CATALYSTS 14 . 12 (2024) . |
| APA | Zhu, Na , Yu, Lingyu , Xu, Pengpeng , Deng, Yang . Enhanced Performance of Ce Doping VW/Ti Catalysts for Synergistic Catalytic Removal of NOx and Chlorobenzene . | CATALYSTS , 2024 , 14 (12) . |
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Cu-SSZ-13 catalysts have been extensively investigated for NH3-SCR over numerous years. However, whether sodium (Na) promoted or inhibited the NH3-SCR performance of Cu-SSZ-13 catalysts was still controversial and needed to be further elucidated. In this work, two Cu-SSZ-13 catalysts, one containing Na and the other without Na, were prepared through a stepwise ion-exchange technique. The objective was to explore the promoting influence of Na on both catalytic activity and hydrothermal stability of Cu-SSZ-13. Analysis via H2-TPR and NH3DRIFTS revealed a notable increase in the formation of [Cu(OH)]+-Z species due to the presence of Na. DFT calculations stimulated the ion-exchange process, and confirmed the migration of Cu species from 6MR to 8MR sites in the presence of Na. This study provides direct experimental evidence regarding the influence of Na on Cu distribution, thereby deepening the understanding of the interaction between Cu sites and co-cations.
Keyword ：
Cu distribution Cu distribution Cu-SSZ-13 Cu-SSZ-13 Na effects Na effects NH3-SCR NH3-SCR Promotion Promotion
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| GB/T 7714 | Zhu, Na , Hou, Lisen , Li, Shuai et al. Understanding Na functions on distribution of Cu species within Cu-SSZ-13 for the selective reduction of NOx with NH3 [J]. | SEPARATION AND PURIFICATION TECHNOLOGY , 2024 , 347 . |
| MLA | Zhu, Na et al. "Understanding Na functions on distribution of Cu species within Cu-SSZ-13 for the selective reduction of NOx with NH3" . | SEPARATION AND PURIFICATION TECHNOLOGY 347 (2024) . |
| APA | Zhu, Na , Hou, Lisen , Li, Shuai , Deng, Yang . Understanding Na functions on distribution of Cu species within Cu-SSZ-13 for the selective reduction of NOx with NH3 . | SEPARATION AND PURIFICATION TECHNOLOGY , 2024 , 347 . |
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Mn-based catalysts are promising low-temperature NH3-SCR catalysts, yet their strong oxidative capability leads to excessive N2O production, contributing to global warming. This study explored titanium nanotubes supported MnOx catalysts for NH3-SCR. The optimal catalyst, 10%Mn/TN showed remarkable NOx conversion over 95 % at 150-400 degrees C, together with a N-2 selectivity surpassing 95 % below 300 degrees C. In contrast, 10%Mn/Ti catalyst used for comparison had a N-2 selectivity as low as 30 %. The active Mn species may predominantly locate within the inner regions of the titanium nanotubes, which effectively regulated the redox properties of 10%Mn/TN. Density Functional Theory (DFT) calculations showed that the decomposition of NH4NO3 formed on 10%Mn/TN into H2O and N2O was more difficult than that on 10%Mn/Ti. Furthermore, the NH3-SCR reaction on 10%Mn/TN mainly followed the Eley-Rideal mechanism and NH4NO3 decomposition was effectively inhibited, consequently leading to a significant improvement in N-2 selectivity. These findings offer crucial insights for the design and development of Mn-based catalysts with superior activity and N-2 selectivity in NH3-SCR applications.
Keyword ：
Mn-based catalysts Mn-based catalysts N-2 selectivity N-2 selectivity Selective catalytic reduction Selective catalytic reduction TiO2 nanotubes TiO2 nanotubes
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| GB/T 7714 | Zhu, Na , Xu, Lichang , Wang, Shuai et al. Probing the role of nanoconfinement in improving N2 selectivity of Mn-based catalysts during NH3-SCR [J]. | APPLIED SURFACE SCIENCE , 2024 , 679 . |
| MLA | Zhu, Na et al. "Probing the role of nanoconfinement in improving N2 selectivity of Mn-based catalysts during NH3-SCR" . | APPLIED SURFACE SCIENCE 679 (2024) . |
| APA | Zhu, Na , Xu, Lichang , Wang, Shuai , Lian, Zhihua , Shan, Wenpo . Probing the role of nanoconfinement in improving N2 selectivity of Mn-based catalysts during NH3-SCR . | APPLIED SURFACE SCIENCE , 2024 , 679 . |
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Copper-based small-pore zeolites catalysts are the promising candidate catalysts for NOx abatement in current diesel vehicles with Chinese VI standards, due to the excellent NH3-SCR catalytic performance, hydrothermal stability, nitrogen selectivity and wide temperature window. However, the catalytic activity of copper-based small-pore zeolites is still significantly affected by sulfur oxides emitted from diesel vehicles, and even the irreversible deactivation occurs. The SO2-poisoning of Cu-based small-zeolites is mainly due to the accumulation of surface ammonium sulfate and sulfation of Cu active site sites. In this review, the research status of the structure and active sites of copper-based small-pore zeolites catalysts is summarized, and the sulfur poisoning mechanism of copper-based small-pore zeolites catalysts is discussed. Moreover, the research advance in the improvement of sulfur resistance of catalysts and the regeneration of sulfur-poisoned catalysts is also illustrated. The systematic understanding of mechanism of sulfur poisoning and regeneration is important for the design of novel, efficient catalyst. It is pointed out that the study on sulfur poisoning mechanism and regeneration mechanism of copper-based small-pore zeolites catalysts, as well as the synergistic effect of various poisoning factors and corresponding deactivation mechanism, are the main research directions for copper-based zeolites to be practically applied to ultra-low emission of nitrogen oxides in diesel vehicle exhaust in the future.
Keyword ：
copper-based small-pore zeolites copper-based small-pore zeolites nitrogen oxides nitrogen oxides regeneration regeneration selective catalytic reduction selective catalytic reduction sulfur poisoning sulfur poisoning
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| GB/T 7714 | Li, Shuai , Zhu, Na , Cheng, Yangjian et al. Performance of Resistance to Sulfur Oxide and Regeneration over Copper-Based Small-Pore Zeolites Catalysts for the Selective Catalytic Reduction of NOx with NH3 [J]. | PROGRESS IN CHEMISTRY , 2023 , 35 (5) : 771-779 . |
| MLA | Li, Shuai et al. "Performance of Resistance to Sulfur Oxide and Regeneration over Copper-Based Small-Pore Zeolites Catalysts for the Selective Catalytic Reduction of NOx with NH3" . | PROGRESS IN CHEMISTRY 35 . 5 (2023) : 771-779 . |
| APA | Li, Shuai , Zhu, Na , Cheng, Yangjian , Chen, Di . Performance of Resistance to Sulfur Oxide and Regeneration over Copper-Based Small-Pore Zeolites Catalysts for the Selective Catalytic Reduction of NOx with NH3 . | PROGRESS IN CHEMISTRY , 2023 , 35 (5) , 771-779 . |
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Cu-SSZ-39 demonstrated exceptional resistance to hydrothermal aging during NH3-SCR. So far, the precise quantification of adsorption sites for various reactants on Cu-SSZ-39 remains uncertain. In this study, the quantitative analysis using a transient response method (TRM) allowed for determining the adsorption quantities of reactants, as well as the concentrations of various Cu species, and the reaction pathway on Cu-SSZ-39 and HSSZ-39. Cu benefited N2 formation through NO reacting with adsorbed NH3, while NH4NO3 reacted with NO to form N2 instead of NO2 or N2O. On Cu-SSZ-39, the dominant pathway involved NO reacting with adsorbed NH3, resulting in the production of N2 and H2O, and another important pathway was "NH4NO3 fast path" (NH4NO3 + NO + *-ONH4 + * & RARR; 2 N2 + 3 H2O + 2 *-OH). O2 facilitated the reaction between NO and NH3. The numbers of Z2Cu2+and ZCu-OH were also determined by TRM. More Z2Cu2+ species caused its high hydrothermal stability.
Keyword ：
Cu-SSZ-39 Cu-SSZ-39 H-SSZ-39 H-SSZ-39 Quantitative study Quantitative study Reaction mechanism Reaction mechanism Transient response method Transient response method
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| GB/T 7714 | Zhu, Na , Liu, Kuo , Li, Yingjie et al. Quantitative study of the adsorption sites and reaction mechanism of NH3-SCR on Cu-SSZ-39 and H-SSZ-39 [J]. | APPLIED CATALYSIS A-GENERAL , 2023 , 665 . |
| MLA | Zhu, Na et al. "Quantitative study of the adsorption sites and reaction mechanism of NH3-SCR on Cu-SSZ-39 and H-SSZ-39" . | APPLIED CATALYSIS A-GENERAL 665 (2023) . |
| APA | Zhu, Na , Liu, Kuo , Li, Yingjie , Liu, Congwei , Shan, Wenpo , He, Hong . Quantitative study of the adsorption sites and reaction mechanism of NH3-SCR on Cu-SSZ-39 and H-SSZ-39 . | APPLIED CATALYSIS A-GENERAL , 2023 , 665 . |
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Si-modified Mn-Ce oxide catalysts were prepared by a co-precipitation method for the selective catalytic reduction of NOx with NH3 (NH3-SCR). The doping of Si can improve significantly the NOx conversion and N-2 selectivity of the Mn-Ce oxide catalysts above 150 & DEG;C. The catalyst with Mn : Ce : Si = 4 : 5 : 1 molar ratio (Mn4Ce5Si1) showed excellent SCR activity at low temperatures, with NOx conversion above 80% at 110-230 & DEG;C. The further acid modification could broaden the operating temperature window of Mn4Ce5Si1, and Mn4Ce5Si1-1%S exhibited higher deNO(x) efficiency (>90%) from 100 to 260 & DEG;C. The Si modification increased the specific surface area and surface acidity, and facilitated the NO/NH3 adsorption, thus enhancing the low-temperature activity through both Langmuir-Hinshelwood (L-H) and Eley-Rideal (E-R) pathways. The N2O production over Mn-Ce oxide catalysts through the L-H mechanism was much lower than via the E-R mechanism.
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| GB/T 7714 | Wang, Shuai , Zhu, Na , Xu, Pengpeng et al. Si-modified Mn-Ce oxide catalysts for selective catalytic reduction of NOx with NH3 at low temperatures [J]. | NEW JOURNAL OF CHEMISTRY , 2023 , 47 (27) : 12893-12901 . |
| MLA | Wang, Shuai et al. "Si-modified Mn-Ce oxide catalysts for selective catalytic reduction of NOx with NH3 at low temperatures" . | NEW JOURNAL OF CHEMISTRY 47 . 27 (2023) : 12893-12901 . |
| APA | Wang, Shuai , Zhu, Na , Xu, Pengpeng , Li, Shuai , Chen, Di . Si-modified Mn-Ce oxide catalysts for selective catalytic reduction of NOx with NH3 at low temperatures . | NEW JOURNAL OF CHEMISTRY , 2023 , 47 (27) , 12893-12901 . |
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The V2O5/TiO2 catalyst is the most concerned NH3-SCR catalytic system for simultaneous removal of NOx and chlorinated volatile organic compounds (Cl-VOCs). There is an urgent need to develop a vanadia-based catalyst with low vanadium loading and excellent low-temperature catalytic performance. In this work, the Pr and W codoped vanadia-based catalysts were prepared by a simple impregnation method. After the doping of Pr and W, the vanadia-based catalyst exhibited the excellent catalytic activity for NOx reduction and chlorobenzene (CB) oxidation. The more abundant polymeric vanadyl species and crystalline V2O5 were observed on the PrV5W/Ti catalyst, which are contributing to NH3-SCR and CB oxidation activity. The redox capability and the amount of surface-active adsorbed oxygen of vanadia-based catalyst were improved markedly, thus promoting NH3-SCR and CB oxidation reaction on PrV5W/Ti. This catalyst is promising to be used in the muti-pollutant control reaction of NOx and VOCs.
Keyword ：
Multi-pollutant control Multi-pollutant control NOx NOx Synergetic removal Synergetic removal Vanadia-based catalysts Vanadia-based catalysts VOCs VOCs
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| GB/T 7714 | Xu, Pengpeng , Zhu, Na , Hou, Lisen et al. Pr-modified vanadia-based catalyst for simultaneous elimination of NOx and chlorobenzene [J]. | MOLECULAR CATALYSIS , 2023 , 548 . |
| MLA | Xu, Pengpeng et al. "Pr-modified vanadia-based catalyst for simultaneous elimination of NOx and chlorobenzene" . | MOLECULAR CATALYSIS 548 (2023) . |
| APA | Xu, Pengpeng , Zhu, Na , Hou, Lisen , Wang, Shuai , Li, Shuai . Pr-modified vanadia-based catalyst for simultaneous elimination of NOx and chlorobenzene . | MOLECULAR CATALYSIS , 2023 , 548 . |
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