Catalysts
·
2019
·Vol. 10
·期 1
·43
·
IF 3.444
Xincheng Wang,Fenghe Zhao,Long Huang
Temperature programmed surface reaction (TPSR) was developed as a method for rapid screening of catalysts. In this study, a series of acid catalysts was screened for the low-temperature dehydration of glycerol to acrolein via TPSR. Results suggested that most catalysts show activity of glycerol conversion to acrolein at a greatly different temperature range. HY, SiO2supported H4SiW12O40(STA/SiO2), SO42−/ZrO2, and SO42−/TiO2were observed to be efficient for the conversion of glycerol into acrolein at 210 °C, which was significantly lower than that generally reported (250–340 °C). Moreover, high selectivity of acrolein was gained at 85% and 86% over SiW/SiO2and SO42−/TiO2, respectively. A new style catalyst, ZnCl2/SiO2, was also found to be highly selective to acrolein and evaluated in a conventional fixed-bed reactor. Especially, stability tests showed that the catalyst life was up to 300 h with no clear deactivation on ZnCl2/SiO2with hydrogen as dilution.Keywords:glycerol;low temperature dehydration;acrolein;TPSR
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2021
·Vol. 11
·期 3
·324
·
IF 4.146
Jinkun Guan,Lusha Zhou,Weiquan Li,Die Hu,Jie Wen,Bichun Huang
SO2poisoning is a great challenge for the practical application of Mn-based catalysts in low-temperature selective catalytic reduction (SCR) reactions of NOxwith NH3. A series of Gadolinium (Gd)-modified MnOx/ZSM-5 catalysts were synthesized via a citric acid–ethanol dispersion method and evaluated by low-temperature NH3-SCR. Among them, the GdMn/Z-0.3 catalyst with the molar ratio of Gd/Mn of 0.3 presented the highest catalytic activity, in which a 100% NO conversion could be obtained in the temperature range of 120–240 °C. Furthermore, GdMn/Z-0.3 exhibited good SO2resistance compared with Mn/Z in the presence of 100 ppm SO2. The results of Brunauer–Emmett–Teller (BET), X-ray photoelectron spectroscopy (XPS), temperature-programmed reduction of H2(H2-TPR) and temperature-programmed desorption of NH3(NH3-TPD) illustrated that such catalytic performance was mainly caused by large surface area, abundant Mn4+and surface chemisorbed oxygen species, strong reducibility and the suitable acidity of the catalyst. The in situ diffuse reflectance infrared Fourier transform spectra (DRIFTS) results revealed that the addition of Gd greatly inhibited the reaction between the SO2and MnOxactive sites to form bulk manganese sulfate, thus contributing to high SO2resistance. Moreover, in situ DRIFTS experiments also shed light on the mechanism of low-temperature SCR reactions over Mn/Z and GdMn/Z-0.3, which both followed the Langmuir–Hinshelwood (L–H) and Eley–Rideal (E–R) mechanism.Keywords:SO2poisoning;low temperature;NH3-SCR;in situ DRIFTS
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
Cell Reports Physical Science
·
2024
·
IF 7.9
Naichao Chen,Li Li,Xinwei Xu,Chengyuan Wang,Jin Cheng,Weishu Liu,Hong Wang
Ceramics that are thermally conductive and can be sintered at low temperatures are particularly desired for hybrid integration and co-fired technology in upsurging high-frequency communication applications. However, a seemingly contradictory relation between high thermal conductivity and low sintering temperature remains a critical challenge. Herein, we report that densified and oriented boron nitride (BN)-based ceramic composites that are sintered at ultralow temperatures (e.g., 150°C) exhibit an ultrahigh thermal conductivity (42 W m −1 K −1 ), far outperforming current state-of-the-art low-temperature ceramics. We reveal by experiments and simulations that the high thermal conductivity of the ceramic composites is attributable to a high density and high orientation of BN platelets that were previously unattainable at low temperatures, as further supported by our newly developed theoretical model. Coupled with simultaneously achieved excellent microwave dielectric properties, this work opens up a new avenue to high-thermal-conductivity ceramics that are integrable with high-power devices at low temperatures.
研究领域:
材料科学
·
无机非金属材料
·
电子封装
·
微波介质陶瓷
·
热管理材料
✓ 已验证
DOI
高影响因子
Materials
·
2020
·Vol. 13
·期 2
·437
·
IF 3.057
Heming Song,Hongge Jia,Qingji Wang,Xinyi Zhao,Guoxing Yang,Mingyu Zhang,Hailiang Zhou,Shuangping Xu,Yu Zang,Yazhen Wang,Liqun Ma
Corn straw is an agricultural waste. The system for extracting cellulose from corn straw at a high temperature has been widely reported by researchers. However, the system for extracting cellulose from corn straw at a low temperature has been rarely reported. In this paper, a new system for extracting cellulose from corn straw at a low temperature was reported for the first time. This new system is designated as the low temperature laccase system (LTLS). Cellulose was successfully extracted from corn straw by the LTLS, and the used solution could be recycled. Therefore, the low temperature laccase system is an environmentally-friendly system. The cellulose content in corn straw is 30–40%. The yield of cellulose extracted by LTLS was 33%. The obtained cellulose product was creamy white. The extracted cellulose samples were characterized by using infrared spectroscopy (IR), thermogravimetry (TG), and X-ray diffraction (XRD). The results were consistent with that of standard cellulose. We confirmed that the LTLS extracted cellulose from corn straw with high purity.Keywords:cellulose;corn straw;low temperature;laccase
研究领域:
生物化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2022
·Vol. 23
·期 21
·13221
·
IF 6.208
Haohao Huo,Yuzhen Li,Shaojie Wang,Siyang Tan,Xin Li,Siyuan Yi,Lizhen Gao
Herein, Zn3In2S6photocatalyst with (110) exposed facet was prepared by low temperature solvothermal method. On this basis, a highly efficient binary Zn3In2S6/g-C3N4was obtained by low temperature solvothermal method and applied to the degradation of tetracycline (TC). The samples of the preparation were characterized by X-ray diffraction, scanning electron microscope, transmission electron microscope, UV–vis diffuse reflection spectroscopy, and photoluminescence spectroscopy. Furthermore, the degradation performance of photocatalysts on TC was investigated under different experimental conditions. Finally, the mechanism of Zn3In2S6/g-C3N4composite material degrading TC is discussed. The results show that Zn3In2S6and Zn3In2S6/g-C3N4photocatalysts with excellent performance could be successfully prepared at lower temperature. The Zn3In2S6/g-C3N4heterojunction photocatalyst could significantly improve the photocatalytic activity compared with g-C3N4. After 150 min of illumination, the efficiency of 80%Zn3In2S6/g-C3N4to degrade TC was 1.35 times that of g-C3N4. The improvement of photocatalytic activity was due to the formation of Zn3In2S6/g-C3N4heterojunction, which promoted the transfer of photogenerated electron–holes. The cycle experiment test confirmed that Zn3In2S6/g-C3N4composite material had excellent stability. The free radical capture experiment showed that ·O2−was the primary active material. This study provides a new strategy for the preparation of photocatalysts with excellent performance at low temperature.Keywords:Zn3In2S6/g-C3N4;tetracycline;low temperature;photocatalytic
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
International Journal of Environmental Research and Public Health
·
2022
·Vol. 19
·期 24
·16879
·
IF 4.614
Tong Li,Zhibo Wang,Yue Shi,Xiaolong Yao
Based on the porous carbon material from citric acid residue, catalysts of different Ce-Mn ratios were prepared with incipient-wetness impregnation (IWI) to delve into their acetone-degrading performance and relevant mechanisms. When the Ce-Mn molar ratio is 0.8, the prepared catalyst Ce0.8-Mn/AC shows abundant and uniformly dispersed Mn and Ce particles on the surface. The content of Mn and Ce on the Ce0.8-Mn/AC surface reaches 5.64% and 0.75%, respectively. At the acetone concentration of 238 mg/m3(100 ppm), the laws of acetone degradation in different catalysts at different catalyzing temperatures and with various oxygen concentrations were studied, and we found that the rate of acetone degradation by Ce0.8-Mn/AC can exceed 90% at 250 °C. Cerium oxide and manganese oxide are synergistic in the catalytic degradation of acetone. Adding cerium to manganese-based catalysts can increase the oxygen migration rate in the catalysts and thus raise the reduction rate of lattice oxygen in manganese oxide. The results offer new ideas and approaches for the efficient and comprehensive utilization of bio-fermentation by-products, and for the development of cheap and high degradation performance catalysts for acetone.Keywords:acetone;Ce0.8-Mn/AC;efficient degradation;low temperatures
研究领域:
环境科学
·
催化材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Bing Yuan,Hongyun Hu,Yongda Huang,Biao Fu,Huimin Liu,Guangqian Luo,Yongchun Zhao,Hong Yao
Gaseous selenium is of high saturated vapor pressure , making its retention in solid phases quite difficult during coal combustion . The selenium transformation from gaseous form into solid phases at low temperatures can be essential to control selenium emission. To understand the migration of SeO 2 (g) on ash particles in the low-temperature zone, this study investigated the speciation of selenium in fly ash and simulated the physical retention of SeO 2 (g) on fly ash. The results demonstrated that there was a large proportion of physically-bound Se in the fly ash of pulverized-coal-fired boiler (22.62 %–58.03%), while the content of physically-bound Se in fly ash of circulated fluidized-bed boiler was lower (∼6%). The physically-bound Se was formed through selenium condensation and physical adsorption. The decrease of temperature or the increase of cooling rate could promote the transformation of gaseous selenium to solid phase and the presence of HCl might suppress SeO 2 transformation into Se in the condensation process . Meanwhile the compositions of fly ash had a great influence on the selenium adsorption process. Among typical coal-fired ash components, mullite showed the best performance in the selenium capture in the temperature range of 90–200 °C, contributing to the high content of physically-adsorbed selenium in PC fly ash. These findings provided new ideas for improving the removal rate of volatile selenium.
研究领域:
环境科学
·
能源与燃料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2023
·
IF 3.8
Xudong Liu,Fengyuan Liu,Junqi Li,Yuanpei Lan,Jian Yang,Arun Murali,Chaoyi Chen,Wei Zhang
To accurately evaluate the phase effects of MnO x in Mn-Ce catalysts towards to low temperature NO x removal performance with NH 3 , MnCO 3 @CeCO 3 OH was synthesized firstly and decomposed to MnO 2 @CeO 2 , Mn 2 O 3 @CeO 2 and Mn 3 O 4 @CeO 2 with similar size and morphology, this will avoid the influence of size and morphology on the experimental results. Experimental results show that the MnO 2 @CeO 2 exhibiting the best NO conversion ratio, which achieved nearly 96.5 % at a low temperature of 150 °C, and the catalytic performance order of MnO x @CeO 2 is determined as: MnO 2 @CeO 2 > Mn 2 O 3 @CeO 2 > Mn 3 O 4 @CeO 2 below 200 °C, and MnO 2 @CeO 2 > Mn 2 O 3 @CeO 2 ≈Mn 3 O 4 @CeO 2 at range of 200 –400 °C. But the N 2 selectivity of Mn 2 O 3 @CeO 2 reaches 96 % at 100 °C which was higher than that of MnO 2 @CeO 2 and Mn 3 O 4 @CeO 2 . Characterizations including BET, XRD, SEM, H 2 -TPR, NH 3 -TPD and FTIR show that MnO 2 @CeO 2 has maximum specific surface area, a stronger redox ability, and more surface acid sites.
研究领域:
催化材料
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Micromachines
·
2023
·Vol. 14
·期 9
·1663
·
IF 3.4
Yunsheng Fu,Xianglei Yu,Li Liu,Xianjie Tang,Junpeng Li,Guoyou Gan
Low-temperature lead-free silver pastes deserve thorough investigation for sustainable development and application of MgTiO3ceramics in electronic devices. In this study, a series of Bi2O3-B2O3-ZnO-SiO2-Al2O3-CaO glasses with suitable softening temperatures were prepared via melt quenching using a type of micrometer silver powder formed by silver nanoparticle aggregates. The composite pastes containing silver powder, Bi2O3glass powder and an organic vehicle were then screen-printed. The effects of glass powder concentration and sintering temperature on the microstructure of the surface interface were also investigated. The results showed that the silver paste for microwave dielectric ceramic filters (MgTiO3) possessed good electrical conductivity (2.28 mΩ/□) and high adhesion (43.46 N/mm2) after medium temperature (670 °C) sintering. Thus, this glass powder has great application potential in non-toxic lead-free silver pastes for metallization of MgTiO3substrates.Keywords:silver paste;MgTiO3;bonding strength;low-temperature sintering
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2018
·Vol. 124
·期 11
·1-7
·
IF 1.604
Yang Yan,Zhang Huaiwu,Li Jie,Gan Gongwen,Wang Gang,Wen Dandan
NiCuZn ferrite ceramics with high permeability, low power loss and excellent thermal stability are vital materials for high-frequency power devices. This paper analyzed grains growth and grain-boundary diffusion of Ni 0.2 Cu 0.2 Zn 0.6 Fe 2 O 4 ferrite ceramics at lower temperatures by adding optimized additives. X-ray diffraction reveals that the samples are pure spinel ferrite phase sintered at low temperatures. SEM images indicate that uniform and compact NiCuZn ferrite ceramics were obtained at 920 °C for 4 h, which is very advantageous for low-temperature co-fired ceramic (LTCC) technology. In addition, the ferrite ceramics with higher permeability (~ 411 @ 1 MHz), lower power loss in high frequency (~ 442 kW/m 3 @ 7 MHz) and good thermal stability were synthesized by controlling grains growth and grain-boundary diffusion. The results indicate that this ferrite ceramic material is a good candidate for the application of miniaturized power electronics in high frequency.
研究领域:
材料科学
·
电气工程
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2025
·
IF 6
Guo-Cui Mao,Jin-Peng Wang,Hui-Lin Jiang,Bao-Xia Dong,Yun-Lei Teng
We found that the activated LiBH 4 or Ni/LiBH 4 can effectively assist CO 2 hydrogenation into C1 and C2 products at low temperature (100–300 ℃). After CO 2 hydrogenation over the activated LiBH 4 or Ni/LiBH 4 , CH 4 with approximately 100 % selectivity was formed in the gas phase products. CH 3 OH, HCOO − , and high-value CH 3 CH 2 OH were observed in aqueous solution of spent LiBH 4 or Ni/LiBH 4 after CO 2 hydrogenation. CO 2 conversion and CH 4 production are able to be further improved by doping 5–20 wt% Ni into the activated LiBH 4 . The LiBH 4 sample shows a 61.34 % CO 2 conversion at 200 ℃, while the 20 %Ni/LiBH 4 composite displays an 80.14 % CO 2 conversion under the same conditions. The experimental and theoretical results suggest that the synergistic effect from Ni and LiBH 4 results in high CO 2 conversion at low temperature. This new method for CO 2 conversion to C1, C2 products using the activated Ni/LiBH 4 composite may enlighten the materials design for CO 2 utilization.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Fanfan Yan,Guowen Shen,Xi Yang,Tianjiao Qi,Jie Sun,Xinghua Li,Mingtao Zhang
Developing of novel chemiresistive gas sensing materials with desired unique gas chemisorption properties is of great important. In this work, motivated by the special electronic structure, Ag 3 PO 4 semiconductor is systematically investigated as gas sensing material for the first time. Encouragingly, the Ag 3 PO 4 nanoparticles based gas sensors exhibit high selectivity to NH 3 at near room temperature of 50 °C with negligible responses to the other gases (including H 2 , CO, ethanol, acetone, NO 2 and SO 2 ). Furthermore, the responses decreased with the increase of operating temperature from 50 to 100 °C, indicating the superior NH 3 sensing activity. The in-situ infrared characterization and theoretical calculations reveal that the lone pair of NH 3 coordinate with the superficial silver atoms of Ag 3 PO 4 accompanied with strong adsorption energy , efficient quantities electron migration and thermodynamic favorable, explained the origin of the high selectivity. Our work indicates that Ag 3 PO 4 based materials are very promising low operating temperature and highly selective NH 3 -sensing materials.
研究领域:
材料科学
·
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）