JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2021
·
IF 6.064
Bichun Huang,Hansun Fang,Huajun Huang,Meijuan Lu,Chenglong Yu
A one-pot synthetic method was used to prepare copper (Cu)-modified manganese (Mn)-rich MnSAPO-34 catalysts, which were then used for NO x removal from stationary-source flue gas. The addition of Cu to these Mn-rich MnSAPO-34 catalysts significantly enhanced their low temperature (LT) selective catalytic reduction (SCR) activity and H 2 O resistance. The Mn 0.4 Cu 0.05 SAPO-34 catalysts demonstrated excellent LT NH 3 -SCR activity, with NO x removal being >90% from 160 to 300 °C. In addition, Mn 0.4 Cu 0.05 SAPO-34 catalysts exhibited high H 2 O resistance. This excellent performance was ascribed to strong synergistic effects between Mn 4+ and isolated Cu 2+ species in Mn 0.4 Cu 0.05 SAPO-34 catalysts, leading to suitable redox ability. The results of in situ FT-IR analysis indicated that LT-SCR reactions mainly proceeded by an Eley–Rideal reaction pathway at 200 °C in Cu-modified manganese-rich MnSAPO-34 catalysts. Thus, Mn 0.4 Cu 0.05 SAPO-34 was considered as a promising candidate for NO x removal from flue gas of stationary sources at low temperatures.
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高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Zulfiqar Ali,Yang-wen Wu,Yue Wu,Zulqarnain Arain,Ming-xin Xu,Qiang Lu,Heping Ma,Huan-yu Zhao
Lead (Pb) species are inescapable constituents of the flue gas from coal-fired power plants and other thermal devices, which can cause impeding effects on the selective catalytic reduction (SCR) reactions. Here, the poisoning effects of Pb on the V 2 O 5 -MoO 3 /TiO 2 type SCR catalyst were examined. The poisoned catalysts were prepared by the solid diffusion and incipient wetness impregnation (IWI) methods. The catalytic activity tests indicated that the Pb-doped catalyst prepared by the IWI method suffered a considerable drop in catalytic activity, while a slender influence was observed on the Pb-loaded catalysts prepared by solid diffusion method. Comprehensive characterizations and density functional theory (DFT) calculations were performed on the fresh and poisoned catalysts prepared by the IWI method to unveil the deactivation mechanism. The results showed that Pb species covered the active sites (V species) on the catalyst surface, resulted in the decrease in chemisorbed oxygen, hence reducing the surface acidities. The decrease in reducibility of the catalyst was an important factor for poisoning of the catalyst. Moreover, Pb species reacted with MoO 3 to form PbMoO 4 which agglomerated on the catalyst surface to further deactivate the catalyst.
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APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Xiaofeng Wang,Zhe Zhao,Yang Xu,Qingbo Li
A series of 3DOM-Mn x Ce y Ti z catalysts with three-dimensionally ordered macroporous (3DOM) structure were synthesized by a soft template method. The high SCR activity of the 3DOM-Mn 3 Ce 1 catalyst at low temperature was owing to the excellent redox ability and rich Lewis and Brønsted acid sites of the catalysts, which were beneficial to improve the catalytic activity. However, the strong oxidizability of MnO x resulted in the nonselective oxidation of NH 3 and generation of N 2 O, decreasing the N 2 selectivity. After addition of Ti, the redox capacity of the 3DOM-Mn 3 Ce 1 Ti 1 catalyst decreased, and the NH 3 were strongly adsorbed on the acid sites, which enhanced the N 2 selectivity with a broadened temperature window of 240–440 °C and a high GHSV of 120000 h −1 . Furthermore, both the 3DOM-Mn 3 Ce 1 and 3DOM-Mn 3 Ce 1 Ti 1 catalysts showed remarkable tolerance of H 2 O. Finally, through in situ DRIFT analysis, the Langmuir-Hinshelwood (L-H) mechanism was confirmed as the dominant reaction pathway over the 3DOM-Mn 3 Ce 1 Ti 1 catalyst.
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CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Chuanzhi Sun,Hao Liu,Wei Chen,Dezhan Chen,Shuohan Yu,Annai Liu,Lin Dong,Shuai Feng
A series of Sm- and/or Zr-doped MnO x -TiO 2 catalysts were prepared, and the catalysts exhibited better N 2 selectivity and SO 2 resistance than the undoped MnO x -TiO 2 catalyst for the selective catalytic reduction of NO by NH 3 (NH 3 -SCR). The reasons for the good N 2 selectivity and SO 2 resistance of the catalysts were proposed. X-ray photoelectron spectroscopy (XPS) combined with density functional theory (DFT) calculations suggested that electron transfer between the manganese and samarium species by Mn 4+ + Sm 2+ ↔ Mn 3+ + Sm 3+ redox cycles occurred in the Sm-containing catalysts. Furthermore, electron transfer from Sm 2+ to Mn 4+ suppressed electron transfer from NH 3 to Mn 4+ , inhibiting the formation of NH 2 or NH. Thus, the pathway for NH generation was removed, and the reaction of 2NH + 4NO → 3N 2 O + H 2 O was prevented. Consequently, the N 2 selectivity of the NH 3 -SCR reaction was enhanced. In situ diffused reflectance infrared Fourier transform spectroscopy ( in situ DRIFTS) combined with thermogravimetry, differential scanning calorimetry and mass spectrometry (TG-DSC-MS) results revealed that the deposition rate of sulfate species decreases after Sm doping, which was also attributed to the suppressed electron transfer from SO 2 to Mn 4+ , i.e., the oxidation of SO 2 to SO 3 . Thus, the catalysts exhibited better SO 2 resistance.
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MATERIALS & DESIGN
·
2024
·
IF 7.6
Zhihua Zhao,Zijie Su,Zhenli Lv,Pu Shi
The potential applications of wearable sensors in health monitoring, micro-environment detection, and advanced soft electronic noses have attracted widespread attention. However, due to the inherent limitations of traditional organic flexible substrates, simultaneously achieving excellent flexibility, high sensitivity, robustness, and breathability remains a significant challenge. Herein, using the electrospinning method, a flexible TPU substrate film was prepared, and Bi 2 S 3 /Ti 3 C 2 T x nanocomposite materials were synthesized through a simple one-step hydrothermal method. Au nanoparticles were attached to the surface of the composite material using sodium borohydride, and finally, the surface impregnation method was used to successfully prepare the Au-Bi 2 S 3 /Ti 3 C 2 T x -TPU flexible electrospun mat. The as-prepared sensor demonstrated an outstanding response of 154 % to 100 ppm NH 3 at room temperature, coupled with high selectivity, repeatability, and long-term stability. The strain properties of the sensor were also evaluated, showcasing its potential for human motion and physiological feature detection, such as breathing, swallowing, and limb movements. The study’s findings indicated that the Au-Bi 2 S 3 /Ti 3 C 2 T x -TPU electrospun mat sensor has promising applications in flexible electronics, wearable environmental monitoring devices, and human healthy monitoring.
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INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Shiju Yang,Xueshuang Yan,Fuzhi He,Zhuliang Chen,Kaizhu Chang,Wan Yang,Futing Xia,Jianjun Chen,Qiulin Zhang
Achieving remarkable activity in selective catalytic reduction of NO by NH3 (NH3-SCR) over CeO2-based catalysts was crucial for their industrial application but still faces a tough challenge, mainly owing to the insufficient acidity and overoxidation ability. Herein, the surface acidity and reducibility of CeO2 catalysts were finely tuned over Mn–W/CeO2 to efficiently eliminate NO and reveal the mechanistic origin of superior catalytic properties. Systematic surface and structure analyses revealed that Mn3O4 interacted with WO3 species in the possible form of Mn–O–W, which could enhance the dispersion of WO3 over the CeO2 surface. The resulting well-dispersed WO3 increased the concentration of both Brønsted acid sites and strong acid sites, effectively suppressing the generation of inactive nitrates and thus providing abundant catalytically active sites for the adsorption and activation of NH3. Importantly, the electron withdrawal from Mn by W atoms associated with the shortened Mn–O bond distance resulted in the appropriate reducibility over Mn–W/CeO2. Accordingly, the undesirable overoxidation of NH3 was weakened, thereby greatly increasing the high-temperature (250–400 °C) NH3-SCR activity. DFT calculations and detailed in situ DRIFTS analysis demonstrated that both “E–R” and “L–H” mechanisms contributed mainly to this superior performance.
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PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
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IF 5.4
Ruijia Dai,Yongqi Zhao,Qingchun Zhai,Shaoyu Wang,Hua Li,Xingxing Chen,Jianglong Yu,Jinxiao Dou
Coal-fired power plants generate substantial quantities of hazardous fly ash and gas pollutants, presenting significant environmental challenges. This study introduces an innovative approach to simultaneously address both waste streams by converting coal fly ash (CFA) into high-performance X zeolite adsorbents. The synthesized X zeolite showed exceptional surface area and well-defined crystalline structure, as confirmed by comprehensive characterization using SEM, XRD, FT-IR, BET, Raman, and TPD analyses. The adsorption performance of the synthesized X zeolite was systematically evaluated using low-concentration (1000 ppm) flue gas components including NH 3 , NO, SO 2 , CO 2 , and C 7 H 8 across operating temperatures of 20–100 ℃. Maximum adsorption capacities at 20 ℃ reached 1.58, 0.38, 1.16, 0.71, and 0.65 mmol/g for NH 3 , NO, SO 2 , CO 2 , and C 7 H 8 respectively, with NH 3 and SO 2 showing notably higher affinities. The selective adsorption behavior stems from strong interactions between polar gas molecules and the zeolite framework under combined dispersion and electrostatic forces. In-situ DRIFTs analysis coupled with DFT calculations revealed that bridging oxygen atoms (T-O-T) within the zeolite structure serve as primary adsorption sites, facilitating electron transfer with gas molecules. These findings demonstrate the potential of CFA-derived X zeolite for efficient multi-pollutant removal from flue gases while simultaneously addressing solid waste management in coal-fired power plants.
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高影响因子
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
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2025
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IF 4.6
Jingzhao Tian,Zhihua Zhao,Jiazhi Li,Wenqiang Qiao,Chengyu Jin
Ammonia (NH 3 ), with its characteristic pungent odor, serves as a key indicator of meat spoilage, necessitating reliable detection methods for the precise assessment of meat freshness. However, the practical application of existing NH 3 sensors is limited by bottlenecks such as insufficient selectivity, relatively low sensitivity, and high operating temperatures. This study successfully fabricated high-performance NH 3 gas sensors using La 2 Sn 2 O 7 nanoparticles prepared via a facile one-step hydrothermal synthesis method. Gas-sensing performance tests revealed that the sensor exhibits a significant response value of 4.52 towards 100 ppm NH 3 at room temperature, a low detection limit down to 1 ppm. Furthermore, the sensor demonstrated superior selectivity for NH 3 compared to common interfering gases, outstanding long-term stability, and high repeatability. The research combined microstructural characterization and electrical property analysis to deeply elucidate its gas-sensing mechanism. Finally, an NH 3 detection alarm prototype device integrated with the La 2 Sn 2 O 7 sensor was designed and validated. This device effectively identified the spoilage status of chicken, beef, and lamb. Experimental results confirmed that the sensor can reliably determine the initial stage of meat spoilage by capturing trace amounts of NH 3 released at the onset of decay. This study provides a promising room-temperature operable sensor solution for practical meat quality monitoring.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Minghao Shi,Jihui Yang,Mingjia Zhang,Shule Zhang,Qin Zhong
The Ce-based catalysts show promising activity in the selective reduction of NO x with NH 3 (NH 3 -SCR) at medium and low temperatures, yet their limited sulfur tolerance hinders broader application. We have developed a catalyst by confining CeO 2 within the mesopores of ZSM-5 zeolite (CeO 2 @ZSM-5), resulting in uniform dispersion and ultra-small CeO 2 nanoparticles (<10 nm). This distinctive structure enhances the interaction between the carrier and active species, reducing the catalyst's surface basicity and its affinity for acidic SO 2 gas. Additionally, the small CeO 2 particle size leads to an increased Ce 3+ concentration, which inhibits the reaction between Ce active sites and SO 2 . Employing a dual strategy of reducing adsorption and inhibiting reactions, we significantly minimized the impact of SO 2 on NH 3 -SCR. Impressively, common Ce-based catalysts become deactivated due to the formation of corresponding sulfates through reaction with SO 2 , however, CeO 2 @ZSM-5 achieves NO x conversion above 98% and N 2 selectivity of 100% within the temperature range of 250 °C to 450 °C. The addition of 100 ppm SO 2 does not significantly affect NH 3 -SCR activity. This study provides an effective approach to mitigate SO 2 adsorption and reactions, offering a valuable strategy for the development of highly efficient sulfur-resistant catalysts.
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高影响因子
Food Packaging and Shelf Life
·
2022
·
IF 8.749
Shuo Shi,Xiaowei Xu,Jia Feng,Yanming Ren,Xue Bai,Xiufang Xia
The pH, ammonia, and H 2 S sensitivity of sodium alginate/black soybean seed coat anthocyanin (SA/BSSCA) films and their response mechanism were analyzed based on stability, intermolecular interactions, and microstructure. The results showed that the with the BSSCA content increased from 0.02% to 0.30%, SA/0.02–0.12BSSCA films had the highest color stability. The highest sensitivity to pH, ammonia, and H 2 S was observed for the SA/0.12–0.30BSSCA films, meanwhile, the SA/0.12BSSCA film had the highest sensitivity to meat unfreshness and spoilage. The incorporation of BSSCAs reduced the water solubility, water vapor absorption, and permeability of the films. With the BSSCA addition, the intermolecular interaction between BSSCAs and SA intensified, reducing the film roughness and number of aggregated particles, resulting in compact microstructures, which improved the film sensitivity. Thus, the SA/0.12BSSCA film was sensitive to pH, ammonia, and H 2 S and, therefore, meat spoilage, while having higher stability, moderate water barrier properties, and denser microstructure.
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高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Pengkai Jin,Liu Yang,Zhongyi Sheng,Xinyue Chu,Dianhui Chen
An indium and copper-doped mordenite catalyst (InCu/MOR) was prepared and tested as a potential catalyst for high temperature NH 3 selective catalytic reduction (NH 3 -SCR) of NO x in the gas turbine . The InCu/MOR catalyst exhibited excellent catalytic activity (over 83 % NO x conversion) in the presence of 5 % H 2 O and 100 ppm SO 2 above 550 °C. A series of characterization (XRD, Py-TR, XPS, NH 3 -TPD, H 2 -TPR and in-situ DRIFTS) were applied to analyze the catalyst. The obtained results showed that the addition of indium promoted the formation of isolated Cu 2+ and more Brønsted acid sites, which could improve the tolerance to sulfur dioxide and inhibit the occurrence of high temperature ammonia oxidation side reactions. Meanwhile, the ammonia on InO + /In 2 O 3 sites was activated and reacted with the nitrate/nitrite species on the catalyst surface to form nitroammonium (NH 4 NO 3 /NH 4 NO 2 ), which was a short lived intermediate for NH 3 -SCR. The superior catalytic performance of InCu/MOR could attribute to these comprehensive effects.
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高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2022
·Vol. 97
·期 10
·2834-2843
·
IF 3.709
Yue Cao,Boyuan Chen,Yongli Dong,Yujun Zhu,Zhibin Li
BACKGROUND A series of Cu-SAPO-34 samples were prepared with different copper sources and addition of tetraethylenepentamine (TEPA) by a one-pot method, which were applied for selective catalytic reduction of NO x with ammonia (NH 3 -SCR). RESULTS Various measurements were carried out to investigate the effect of TEPA addition and copper sources used on sample properties. The results indicated that Cu-SAPO-34 obtained with the addition of TEPA using copper citrate (Cu-SAPO-34-TC) displayed over 90% NO x conversion at 150–500 °C and excellent H 2 O and SO 2 resistance in NH 3 -SCR. This is because the addition of TEPA can control the formation of isolated Cu 2+ species located at the junction of D6R in CHA cage, Site (I), which is regarded as a more easily approachable site to adsorbates (NH 3 and NO) than others, thus leading to the excellent NH 3 -SCR performance. Further study demonstrated that the Cu-SAPO-34-TC catalyst shows much wider temperature window and more hydrothermal stability due to a greater amount of surface isolated Cu 2+ , fewer Si islands and more Al(IV) species. CONCLUSIONS The excellent activity of the Cu-SAPO-34-TC catalyst can be attributed to the addition of TEPA, which is beneficial for controlling the isolated Cu 2+ at Site (I) as well as inhibiting the aggregation of CuO species. Various characterizations also confirm that more surface Cu 2+ can be produced using copper citrate as copper source. © 2022 Society of Chemical Industry (SCI).
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