CATALYSIS TODAY
·
2022
·
IF 6.562
Shuqi Zhao,Kunli Song,Ruiyu Jiang,Dandan Ma,Hongming Long,Jian-Wen Shi
Nitrogen oxides (NO x ) are typical atmospheric pollutants that harm the environment and human body, and selective catalytic reduction (SCR) with NH 3 is one of the most effective technologies to deal with NO x emissions at present. In this work, a monolithic catalyst, Sm-modified Mn-Ce composite oxides (Sm-MnCe) supported on cordierite (CC), is prepared by impregnation for the first time, and their denitration (de-NO x ) performance in NH 3 -SCR reaction is evaluated in detail. The results show that 0.1Sm-MnCe/CC (Sm/Mn mole ratio is 0.1) has the best de-NO x efficiency with above 80 % NO x conversion from 60° to 270°C, and the high NO x conversion can be maintained within 15 h in the presence of 100 ppm SO 2 . It is found that appropriate introduction of Sm increases the specific surface area and acid sites, improves the redox environment, elevates the content of Mn 4+ on the catalyst surface, which are conducive to the improvement of catalytic activity. In addition, the interaction between active components (Sm, Mn and Ce) also plays a positive role for the excellent de-NO x activity. It is revealed by in-situ diffuse reflectance infrared Fourier transform spectra (DRIFTS) that the NH 3 -SCR reaction over the 0.1Sm-MnCe/CC catalyst follows Eley-Rideal (E-R) and Langmuir-Hinshel (L-H) mechanisms. This work provides ideas for the preparation and modification of monolithic catalysts, which is conducive to promoting the practical industrial application of low-temperature SCR de-NO x technology.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
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.
研究领域:
催化化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Antioxidants
·
2024
·Vol. 13
·期 8
·910
·
IF 6
Lingxia Chen,Lijun Wang,Lifu Ma,Chao Wang,Xinshu Qin,Minlong Wang,Xiaohe Zhang,Ruoyan Yang,Bing Fang,Jie An
The incorporation of antioxidants in food products is essential to prevent or delay deterioration, thereby addressing food spoilage. Thiol compounds, recognized for their natural antioxidant properties, are widely used in various foods; however, their antioxidant capacity is often limited. This study investigates the potential enhancement of thiol antioxidant capacity through the addition of a soluble, low-toxic inorganic Sm-cluster. Our findings demonstrate that the Sm-cluster significantly bolsters the antioxidant efficacy of thiol compounds. We explored, for the first time, the in vitro antioxidant activities of an Sm-oxo/hydroxy cluster combined with a cysteine derivative for potential food applications. The composition exhibited a robust inhibition of aromatic aldehyde flavor compound oxidation and displayed strong, dose-dependent DPPH (2,2-diphenyl-1-picrylhydrazine) radical scavenging activity. Notably, the antioxidant activity of the Sm-cluster/cysteine derivative was further enhanced under strong visible light conditions, which typically increased the likelihood of oxidation. These results suggest that the combination of inorganic cluster and thiol compounds presents a promising natural alternative to traditional antioxidants in the food industry.
研究领域:
食品科学
·
化学
·
营养学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
IEEE SENSORS JOURNAL
·
2024
·Vol. 24
·期 16
·26354-26368
·
IF 4.3
Shengwen Shu,Ruojun Yu,Han Qiu,Longlong Shu,Yongling Lu,Zhen Wang
To realize passive vibration monitoring of power transformers, this study proposes a self-powered method for transformer vibration monitoring sensors based on the Sm-doped-Pb(Mg1/3Nb2/3)O3-PbTiO3 (PMN-PT) piezoelectric bimorph array. This study conducts the theoretical analysis and field measurement of the transformer vibration signals. In addition, the preparation method of a high-performance Sm-doped-PMN-PT piezoelectric bimorph is investigated. The properties of the xSm-PMN-yPT ceramics are also analyzed. Further, the output voltage and power characteristics of the piezoelectric bimorph arrays with different combinations are compared. Finally, the validation and application of the prototype are presented. The experimental results show that the 2.5%Sm-PMN-32PT has a high piezoelectric coefficient (d33) of 1710 pC/N. The results also indicate that the piezoelectric self-powered device with a parallel structure consisting of nine piezoelectric bimorphs has a maximum power generation of 2.341 mW under the measured transformer vibration excitation. Moreover, it is shown that it takes 75 min to complete the charging of the 7.5 V-1-F faradic capacitor from 4.4 to 5 V to satisfy the condition for the required energy of 2.82 J for the vibration signal acquisition, processing, and transmission, realizing the intermittent passive vibration monitoring of the transformer for 16 times per day. Therefore, the proposed method has a promising engineering application prospect.
研究领域:
电气工程
·
材料科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Haolin Xie,Yongxiang Wang,Haitao Liu,Hengyu Wang,Yinghan Li,Xiaopeng Qi,Tongxiang Liang,Jinming Zeng
Electrochromic materials (ECMs) have received attention owing to its huge potential applications, such as smart dimming windows, static displays, and electrochromic capacitors. High optical contrast and long cyclic life of ECMs are extremely critical for practical applications. In this work, the WO 3 and rare earth Sm-doped WO 3 (WSm x , x = 2.0, 3.0, 4.0, 5.0) films were constructed by hydrothermal system, and then their morphology and electrochromic performance were explored. The morphology of the WO 3 film was transformed from an urchin-like to a nest-like porous structure by adding 4.0%Sm into the hydrothermal system. In comparison with the WO 3 film, the WSm4.0 film displayed higher optical contrast and cyclic life, which was resulting from its crystalline and amorphous mix phases, and nest-like porous structure with high Li + diffusion coefficient and strong structure stability. The optical contrasts of the WO 3 and WSm4.0 films were 57.9% and 61.4% at 633 nm wavelength, respectively. Furthermore, WSm4.0 film exhibited optical contrast of around 70% range from 700 to 1100 nm wavelength. Remarkably, WSm4.0 film still retained 91.7% and 73.6% of primitive optical contrast after 6000 and 10000 cycles, respectively. The nest-like porous WSm4.0 film are promising for assembling electrochromic smart windows with long cyclic life and high optical contrast.
研究领域:
材料科学
·
电化学
·
纳米技术
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2017
·
IF 0
Peng Sun,Rui-tang Guo,Shu-ming Liu,Shu-xian Wang,Wei-guo Pan,Ming-yuan Li,Shuai-wei Liu,Jian Liu,Xiao Sun
CeSmOx mixed oxide catalysts supported on TiO 2 prepared by coprecipitation method were used for selective catalytic reduction of NOx with NH 3 . The results showed that the addition of Sm could effectively enhance the low-temperature SCR activity and SO 2 /H 2 O resistance of Ce/TiO 2 catalyst, and the appropriate mole ratio of Sm to Ce was 0.3. Characterization results indicated that the introduction of Sm could promote the formation of Ce 3+ and chemisorbed oxygen species on catalyst surface, which was favorable to the generation of NO 2 . Moreover, the doping of Sm could also promote the adsorption of NH 3 and NOx species on Ce/TiO 2 catalyst. The results of in situ DRIFT study revealed that the NH 3 -SCR reaction over CeSm/TiO 2 -0.3 catalyst was mainly controlled by the Langmuir−Hinshelwood mechanism in the low temperature range (<200 °C). Thereafter, the promoted NO oxidation and the enhanced NH 3 adsorption should play a major role for the excellent low-temperature SCR performance of CeSm/TiO 2 -0.3 catalyst.
研究领域:
催化
·
环境科学
·
材料科学
✓ 已验证
DOI
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Jian Zhang,Zihan Zhao,Ke Wang,Yingying Li,Yuxuan Tao,Chunlei Zhao,Xiulai Chen
One‑carbon (C1) compounds are important carbon feedstocks for achieving a sustainable bio-economy. However, it remains challenging to tap the full potential of C1 compounds utilization, due to the inefficiency of co-utilization of different C1 compounds. Here, a new-to-nature C1-fixing pathway, the serine aldolase/malic enzyme (SM) cycle, was developed to convert C1 compounds to acetyl-CoA by programming CO 2 -fixing carboxylation reaction, formaldehyde-assimilating aldolization reaction and acetyl-CoA-producing cleavage reaction. The SM cycle was drafted by metabolic retrosynthesis, constructed with enzymes originating from six different organisms, and optimized by engineering key enzymes and adjusting reaction system, and thus its C1 utilization rate was up to 30.2 nmol min −1 mg −1 cycle proteins. Sequentially, the SM cycle was programmed in a plug-and-play fashion by installing carbon chain extension modules for converting C1 compounds to various organic molecules such as C 2 -compounds ( e.g. , acetaldehyde and acetyl-CoA), C 3 -compounds ( e.g. , pyruvate, 3-hydroxypropionate and propionyl-CoA), C 4 -compounds ( e.g. , succinate, fumarate and succinyl-CoA). Finally, the applicability of the SM cycle was ascertained in a 5 L fermenter for the production of diverse chemicals, such as pyruvate and succinate, with C1 utilization rate up to 34.5 and 35.8 mg/gDCW/h, respectively, surpassing that of microalgae and cyanobacteria. This study presented here provides a carbon-negative flexible platform for widening the versatility of C1 utilization and may boost C1-based biomanufacturing in a sustainable future.
研究领域:
合成生物学
·
代谢工程
·
工业生物技术
·
微生物学
·
生物过程工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 38
·13405-13414
·
IF 7.059
Zhi-Gang Liu,Zhen-Hua Tang,Song-Cheng Hu,Di-Jie Yao,Fei Sun,De-Yang Chen,Xiao-Bin Guo,Qiu-Xiang Liu,Yan-Ping Jiang,Xin-Gui Tang
Progress in energy storage ceramics for applications has been of interest owing to their clean green nature and excellent ferroelectric/dielectric performances. In this study, lead-free Sm-doped 0.95BaTiO3–0.05Bi(Mg0.5Ti0.5)O3 (BT–BMT–xSm) relaxor ferroelectric ceramics were synthesized and confirmed to be an appropriate material for storage devices. After the introduction of Sm2O3 into BT–BMT ceramics, their hysteresis loops gradually shrank and became slender, which is beneficial to achieving high efficiency energy storage in ceramic capacitors. The maximum recoverable energy density for the BT–BMT–xSm (x = 0.03) sample reached 3.86 J cm−3 at normal temperature, and its corresponding energy efficiency reached 81.6%. Moreover, it was found from impedance spectroscopy that the breakdown field strength is related to the oxygen defect content in the samples. Ceramic samples with fewer defects have better insulation performance, which means that a high breakdown field strength will be obtained. With proper doping, enhanced relaxor behaviour and breakdown field strength were obtained to achieve excellent energy storage properties.
研究领域:
材料科学
·
能量存储
·
陶瓷
·
铁电材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 102
·期 9
·5494-5502
·
IF 3.094
Weijia Guo,Jie Zhang,Yu Luo,Zhenxing Yue,Longtu Li
Ba 4 (Sm 0.15 Nd 0.85 ) 9.33 Ti 18- z Al 3 z /4 O 54 (BSNT- z Al, 0.0 ≤ z ≤ 2.5) ceramics were prepared via a solid-state reaction, and the effects of Al doping on the microwave dielectric properties and defect behavior of the title compound were studied. X-ray diffraction (XRD) analysis and scanning electron microscopy (SEM) photographs suggested that Al ions successfully entered the lattice to form tungsten-bronze-like solid solutions. With a small amount of Al substitution, the relative dielectric constant (ε r ), and the temperature coefficient of resonant frequency ( τ f ) values decreased, whereas the quality factor ( Q × f ) substantially increased by approximately 50%. The defect-related extrinsic dielectric loss was clarified via the thermally stimulated depolarization current (TSDC) technique. With Al doping, the TSDC relaxation of across-grain-boundary oxygen vacancies ( ) vanished, whereas that of defect dipoles ( ) appeared at relatively low temperatures. Therefore, in the BSNT- z Al ceramics, oxygen vacancies were more inclined to interconnect with to form defect dipoles. This could reduce the activity of and account for the notable improvement in the Q × f values. In particular, the excellent characteristics of ε r = 67.33, Q × f = 16 530 GHz, and τ f = +0.87 ppm/°C were achieved in the specimens with z = 1.5 sintered at 1350°C for 4 hours.
研究领域:
材料科学
·
电陶瓷
·
介电材料
·
固态化学
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 38
·2303736
·
IF 19
Qiong Liu,Faqi Zhan,Hang Luo,Xiaogang Luo,Qiuyan Yi,Qiwei Sun,Zhida Xiao,Yan Zhang,Dou Zhang,Chris R. Bowen
The piezoelectric enhancement of photo-catalytic activity for water splitting and pollutant degradation is a novel approach to developing renewable energy and environmental protection applications. Herein, a new form of defect engineered Na-Sm bimetallic-regulated CaBi 2 Nb 2 O 9 platelet is synthesized via a molten salt process for water splitting and pollutant degradation applications. An intermediate band structure is introduced by Sm-doping, and empty orbitals in the conductive band are introduced by Na-doping. These factors, combined with the increased local charge density around the Sm and Na atoms, result in an increased electrical conductivity, improved electron mobility, and provide additional electrons for enhancing catalytic reactions. As a consequence, the judicious co-doping of CaBi 2 Nb 2 O 9 with Sm and Na leads to a unique synergetic piezo-photo-electric effect to provide a superior piezo-photo-catalytic performance for H 2 production (158.53 µmol g −1 h −1 ) and pollutant degradation (rate constant, k = 0.257 min −1 ). This new approach provides important insights into the application of defect engineering to exploit the cooperative doping of alkaline earth metals and rare metals to create high-performance catalysts.
研究领域:
材料科学
·
催化
·
环境科学
·
能源材料
·
固体化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Ning Wu,Hao Guo,Rui Xue,Mingyue Wang,Yujuan Cao,Xiaoqiong Wang,Mengni Xu,Wu Yang
Mercury (Hg 2+ ) is a highly hazardous and widespread environmental pollutant with bioaccumulative properties, so highly sensitive detection and effective removal of mercury in water environment are very necessary. Considering “soft base” property of N atom, N-containing organic groups cannot coordinate effectively with “hard acid” rare earth ions . A [Sm(ATPA) 1.5 (DEF)] n (Sm-MOF) (H 2 ATPA = 2-aminoterephthalic acid) containing free amino groups is constructed for simultaneous detection and removal of Hg 2+ ions. Hg 2+ can quench effectively the charge transfer emission of Sm-MOF in aqueous solution, and simultaneously induce the Sm 3+ characteristic fluorescence emission of Sm-MOF. The results shows that the prepared Sm-MOF has an excellent selectivity and a high sensitivity for detecting Hg 2+ with a wide linear range of 0.6–300 μM and a low detection limit of 0.87 μM. At the same time, the MOF is also employed to adsorb and remove Hg 2+ in aqueous solution and it is found that over 97% of Hg 2+ can be removed in approximately 2 h.
研究领域:
环境科学
·
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2025
·
IF 4.2
Qinming Wang,Jinlin Wan,Sen Wu,Xingfu Zhou
To address the two critical issues of low near-infrared (NIR) photon utilization and poor ultraviolet (UV) stability in perovskite solar cells (PSCs), this study synthesized Sm 3+ and Er 3+ co-doped TiO 2 nanorod (NRs) arrays via a hydrothermal method and employed them as the electron transport layer (ETL) for carbon-based PSCs. The incorporation of Sm 3+ and Er 3+ simultaneously improves perovskite infiltration, carrier-transport efficiency, and light absorption performance. Compared with pristine TiO 2 , the Sm/Er co-doped NRs effectively suppress non-radiative recombination, reduce series resistance, improve electron mobility, and prolong carrier lifetime. Furthermore, the introduction of Sm 3+ , Er 3+ into TiO 2 NRs weakens the radial growth of nanorods. A positive bandgap shift and a negative flat-band potential shift were observed after doping. The co-doped PSCs achieved 12 % increase in conversion efficiency when compared with the undoped device. The doped perovskite exhibited strong resistance to ultraviolet-induced degradation. The device has an infrared light efficiency of 0.15 % at the wavelength of 800–1100 nm.
研究领域:
材料科学
·
纳米技术
·
光伏器件
·
固体物理
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）