INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Run Zhang,Youling Hou,Gangqiang Fan,Dejun Huang,Xiaoming Ding,Jie Dang
The utilization of titanium-bearing blast furnace slag (TBFS) has been widely concerned, which is mainly related to the recovery of titanium resources. In order to realize the efficient and clean recovery of titanium resource, the main titanium-bearing phases (CaTiO 3 , MgTiO 3 and Mg 2 TiO 4 ) in TBFS with high content of MgO were investigated in CH 4 –H 2 system in this work. Thermodynamic calculation indicated that CaTiO 3 , MgTiO 3 and MgTi 2 O 4 could be ultimately reduced to TiC x O y at 1300 °C, 1200 °C and 1200 °C respectively. The reduction experiments were carried out in flowing CH 4 –H 2 , which considered the influences of time, temperature and addition, the results of which showed that the optimal reduction temperatures of CaTiO 3 and MgTiO 3 were 1400 °C and 1200 °C respectively. DFT calculation results also confirmed that MgTiO 3 had stronger CH 4 adsorption capacity than CaTiO 3 and Mg 2 TiO 4 . However, Mg 2 TiO 4 could not be reduced completely even at 1450 °C, because excessive MgO in the reduced products prevented further reaction in kinetics. Both increasing temperature and adding iron oxides contributed to the reduction kinetics . The results suggested that the appropriate increase of the proportion of MgO in TBFS was beneficial to titanium extraction. This work provides a way to develop new process to extract titanium from TBFS, especially the slag with high MgO.
研究领域:
冶金工程
·
材料科学
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产品关联
DOI
高影响因子
Small
·
2024
·
IF 13
Xue Hu,Zhiying Li,Jianbo Li,Chuanlong Jin,Junjiang Bao,Xiaopeng Zhang,Xiaobin Jiang,Ning Zhang,Gaohong He
Membrane technology exhibits low cost and high efficiency in gas separation. Zeolite-imidazole framework-67 (ZIF-67) membrane shows a theoretically superior performance in H 2 /CO 2 separation, owing to its effective size-sieving pores between H 2 and CO 2 . However, the gas molecules are permeate through a series of consecutive crystal cells of common ZIF-67 polycrystalline membranes, resulting in high transport resistance to the gas permselective transport. To this end, this work employs a contra-diffusion synthesis to construct a honeycomb ZIF-67 (h-ZIF67) crystalline membrane for low-resistance H 2 /CO 2 permselective transport. The controlled growth of h-ZIF67 following the van der Drift theory produces the honeycomb polycrystal with hierarchical channels for low-resistance gas permeation. The prepared membrane with micron-scale thickness still achieves a H 2 permeance as high as 1.6 × 10 −7 mol m −2 s −1 Pa −1 and a H 2 /CO 2 selectivity of 17, which can be maintained after a long-term operation for the H 2 /CO 2 mixture separation.
研究领域:
材料科学
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化学工程
·
气体分离技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Sainan Cao,Bingjie Zou,Jingxia Yang,Jinjie Wang,Huangdi Feng
A heterogeneous catalyst CuO–CeO2 with a hollow structure was successfully synthesized by assembling CuO on the outer surface of CeO2 hollow spheres through a layer-by-layer deposition strategy. Further reduction under a H2 atmosphere was carried out to modify its surface state, resulting in sample r-CuO–CeO2. The catalysts were characterized by X-ray diffraction, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and Fourier transform-infrared spectroscopy (FT-IR). SEM and TEM showed that the synthesized catalysts had a hollow sphere structure, which can expose more active sites and promote mass transfer. The results of XPS revealed that the content of Cu0&Cu+ increased from 13.6 to 19.0% after H2 reduction, which was conducive to the activation of terminal alkyne to promote the annulation/A3-coupling reaction. The conversion of this cascade reaction with the r-CuO–CeO2 catalyst can reach more than 95%, while the value was only 55% by using CuO–CeO2 as a catalyst. Moreover, the r-CuO–CeO2 catalyst showed a good recycle property and group compatibility in the general applicability of the cascade annulation/A3-coupling reaction, providing a series of propargylamine derivatives in good chemoselectivity.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2021
·
IF 5.706
Yihui Li,Wei Lu,Ziang Zhao,Min Zhao,Yuan Lyu,Leifeng Gong,Hejun Zhu,Yunjie Ding
Surface oxygen groups of carbon materials has been validated to be necessary for the synthesis of supported catalysts. Herein we report that the activity and selectivity of activated carbon-based material supported Co catalysts can be tuned by modifying the surface oxygen group concentration. As the groups were cleansed by H 2 at 1173 K, the FTS activity dropped from 8.4 to 4.0 mmol CO/(gcat∙h). Whereas a following oxidation procedure could restore the FTS activity by regenerating the groups. Among which the HNO 3 treatment exhibited the best effect with a remarkable elevation of activity (from 4.0 to 13.6 mmol CO/(gcat∙h)) and C 5+ /ROH combined selectivity (64.9 C%). Characterization methods proved that the rationale behind which should be attributed to the increased Co dispersion/reduction degrees and CO/H 2 uptakes facilitated by the surface oxygen groups, and it exhibited that the activity of FTS increased as the surface oxygen group concentration and acidity were elevated.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 46
·28863-28875
·
IF 3.361
Yu Qin,Li Xu,Liying Liu,Xiaoyu Deng,Yucheng Gao,Zhongwei Ding
A novel gas separation approach is proposed in this work by combining an amine-based solid adsorbent with a zeolitic imidazolate framework-8 (ZIF-8) membrane. This was achieved by incorporating the amine-based solid adsorbent during the fabrication of the ZIF-8 membrane on a macroporous substrate. An amine-based solid adsorbent was prepared using porous ZIF-8-3-isocyanatopropyltrimethoxysilane (IPTMS) and N-[(3-trimethoxysilyl)propyl]diethylenetriamine (3N-APS) amine compounds. The as-prepared porous amine-based solid adsorbent (denoted as ZIF-8-IPTMS-3N-APS) possessed excellent adsorptive CO2/N2 and CO2/CH4 separation performances. As the adsorbent needs to be regenerated, this could indicate that the CO2 adsorption separation process cannot be continuously operated. In this work, an amine-based solid adsorbent was applied during the preparation of the ZIF-8 membranes owing to the following reasons: (i) gas separation by the membrane can be operated continuously; (ii) the amino group provides a heterogeneous nucleation site for ZIF-8 to grow; and (iii) the reparation of surface defects on the macroporous substrate can be performed prior to the growth of the ZIF-8 membrane. Herein, the ZIF-8 membrane was successfully fabricated, and it possessed excellent CO2/CH4, CO2/N2, and H2/CH4 separation performances. The 0.6 μm ultrathin ZIF-8 membrane demonstrated a high CO2 permeance of 4.75 × 10−6 mol m−2 s−1 Pa−1 at 35 °C and 0.1 MPa, and ideal CO2/N2 and CO2/CH4 selectivities of 4.67 and 6.02, respectively. Furthermore, at 35 °C and 0.1 MPa, the ideal H2/CH4 selectivity of the ZIF-8 membrane reached 31.2, and a significantly high H2 permeance of 2.45 × 10−5 mol m−2 s−1 Pa−1.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2015
·Vol. 22
·期 17
·13077-13082
·
IF 2.828
Yang J.,Li X. D.,Meng W. J.,Lu S. Y.,Chen T.,Yan J. H.,Buekens A.,Olie K.
In this study, simulated fly ash containing CuO/CuCl 2 was heated at 350 °C in a flow of N 2 and also in a nitrogen flow containing 10 vol% H 2 , to evaluate the influence of hydrogen adding on dioxin formation. The total polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/F) output derived from the CuO sample under N 2 and 10 % H 2 was 7.382 and 0.708 ng/g, respectively. As for CuCl 2 , it was 589 and 46.1 ng/g, respectively. The results show that the hydrogen adding has a good inhibition effect on PCDD/F formation; the inhibition rate was higher than 90 % for PCDD/Fs. HCl and NH 3 were detected by Gasmet in the flue gas; the probable inhibition mechanism of hydrogen reaction was proposed, based on our measurements and others’ researches.
研究领域:
环境科学
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化学工程
·
污染控制
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Xixi Cen,Yuxiu Sun,Caijiao Yu,Chenxu Geng,Zhenjie Gu,De Ao,Zhengqing Zhang,Zhihua Qiao,Chongli Zhong
Large-area metal–organic framework (MOF) single crystal membrane materials hold great appeal in gas separation field due to their outstanding separation selectivity and permeability. Nevertheless, it is currently difficult to prepare MOF single crystals large enough for gas separation tests owing to the limited manufacturing processes. In this work, we fabricate a self-supporting MOF single crystal (Co-btec SC) membrane with 0.3 × 0.1 cm 2 dimension via a facile supersaturation synthesis strategy. Benefiting from the one-dimensional (1D) transmission pathway and three-dimensional (3D) connection network, the obtained Co-btec SC has ultra-high permeability of 47,647 Barrer. Besides, the H 2 O molecules firmly filled in the pore channels greatly improve the affinity and solubility for CO 2 , and thus Co-btec SC yields CO 2 preferential permeation in CO 2 /H 2 mixture with superior CO 2 /H 2 selectivity of 18.79. In addition, the Co-btec SC shows dramatic high-temperature and high-humidity separation stabilities. To demonstrate the versatility of this strategy, we also successfully fabricated hydrogen-bonded organic framework single crystals (HOF SCs) with the size of about 0.4 cm. This supersaturation strategy opens a new way to fabricate the large-area MOF single crystal membranes.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Qi Wang,Yishun Ji,Jinsheng Shi,Lili Wang
As a newly emerging treatment strategy for many diseases, hydrogen therapy has attracted a lot of attention because of its excellent biosafety. However, the high diffusivity and low solubility of hydrogen make it difficult to accumulate in local lesions. Herein, we develop a H2 self-generation nanoplatform by in situ water splitting driven by near-infrared (NIR) laser. In this work, core–shell nanoparticles (CSNPs) of NaGdF4:Yb,Tm/g-C3N4/Cu3P (UCC) nanocomposites as core encapsulated with zeolitic imidazolate framework-8 (ZIF-8) modified with folic acid as shell are designed and synthesized. Due to the acid-responsive ZIF-8 shell, enhanced permeability and retention (EPR) effect, and folate receptor-mediated endocytosis, CSNPs are selectively captured by tumor cells. Upon 980 nm laser irradiation, CSNPs exhibit a high production capacity of H2 and active oxygen species (ROS), as well as an appropriate photothermal conversion temperature. Furthermore, rising temperature increases the Fenton reaction rate of Cu(I) with H2O2 and strengthens the curative effect of chemodynamic therapy (CDT). The excess glutathione (GSH) in tumor microenvironment (TME) can deplete positive holes produced in the valence band of g-C3N4 in the g-C3N4/Cu3P Z-scheme heterojunction. GSH also can reduce Cu(II) to Cu(I), ensuring a continuous Fenton reaction. Thus, a NIR-driven H2 production nanoplatform is constructed for H2-mediated cascade-amplifying multimodal synergetic therapy.
研究领域:
纳米技术
·
癌症治疗
·
材料科学
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光热治疗
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化学工程
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生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2017
·
IF 6.035
Xingyu Wu,Wei Liu,Hong Wu,Xue Zong,Leixin Yang,Yingzhen Wu,Yanxiong Ren,Chengyou Shi,Shaofei Wang,Zhongyi Jiang
In this study, novel kinds of MMMs were fabricated by incorporating ZIF-67 nanoparticles into polymers of intrinsic microporosity (PIM-1). ZIF-67 (Co substituted ZIF-8) displays stiffer Co-N bond as compared with the Zn-N bond in ZIF-8, which might led to the slightly smaller effective pore aperture of ZIF-67. Good compatibility between ZIF-67 nanoparticles and PIM-1 matrix rendered ideal interfacial morphology. The intrinsic separation performance of ZIF-67 was estimated from our experimental separation results based on the Maxwell model. The calculation demonstrated its superior CO 2 /CH 4 selectivity of 45, which is twice compared with that of ZIF-8, supporting the high molecular sieving efficiency of PIM-1/ZIF-67 MMMs. Particularly, the CO 2 and H 2 permeability increased by 15.1% and 59.6% for PIM-1 membrane with 20 wt% ZIF-67 loading, meanwhile CO 2 /CH 4 and H 2 /CH 4 selectivity increased by 34.4% and 86.96%, respectively. The strategy of incorporating highly selective ZIFs into polymers of intrinsic microporosity may have promising potential in fabricating high performance membranes for efficient gas separation.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2018
·
IF 4.521
Ting Yi,Yibo Zhang,Xiangguang Yang
Pt@CeO 2 /MCM-56 (PCM) and CeO 2 -CuO (9:1)/MCM-56 (CCM) were combined to purify the exhaust emissions from diesel vehicles in three configuration statuses, defined as configuration A—where CCM stays above PCM, configuration B—where PCM stays above CCM, and configuration C—where CCM mixes with PCM homogeneously in loose contact. Among these combined catalysts, the configuration A is most favorable for the selective catalytic reduction (SCR) reaction, with >80% NO x conversion obtained at the temperature range of 150–550 °C and gas hourly space velocity (GHSV) of 240,000 ml g −1 h −1 . NH 3 -TPD, H 2- TPR and NH 3 conversion measurements demonstrated that NH 3 can be selectively used to reduce NO x in the configuration A but is over-oxidized if the reaction is operated in configuration B or configuration C status, deteriorating the deNO x activity at temperature above 250 °C. Hence, configuration A not only takes advantage but also overcomes the shortcomings of PCM and CCM, leading to high NO x conversion and N 2 selectivity. A significant decrease in the onset temperature of soot combustion was also observed in this research.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 10
·2255
·
IF 4.2
Yan Cui,Zequan Zeng,Yaqin Hou,Shuang Ma,Wenzhong Shen,Zhanggen Huang
Noble metals have become a research hotspot for the oxidation of light alkanes due to their low ignition temperature and easy activation of C-H; however, sintering and a high price limit their industrial applications. The preparation of effective and low-noble-metal catalysts still presents profound challenges. Herein, we describe how a Ru@CoMn2O4spinel catalyst was synthesized via Ru in situ doping to promote the activity of propane oxidation. Ru@CoMn2O4exhibited much higher catalytic activity than CoMn2O4, achieving 90% propane conversion at 217 °C. H2-TPR, O2-TPD, and XPS were used to evaluate the catalyst adsorption/lattice oxygen activity and the adsorption and catalytic oxidation capacity of propane. It could be concluded that Ru promoted synergistic interactions between cobalt and manganese, leading to electron transfer from the highly electronegative Ru to Co2+and Mn3+. Compared with CoMn2O4, 0.1% Ru@CoMn2O4, with a higher quantity of lattice oxygen and oxygen mobility, possessed a stronger capability of reducibility, which was the main reason for the significant increase in the activity of Ru@CoMn2O4. In addition, intermediates of the reaction between adsorbed propane and lattice oxygen on the catalyst were monitored by in situ DRIFTS. This work highlights a new strategy for the design of a low-noble-metal catalyst for the efficient oxidation of propane.
研究领域:
催化
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Han Feng,Luotian Lv,Yankai Huang,Tong Li,Yao Liu,Yongqing Wang
Syngas has important industrial applications, and converting CO 2 to CO is critical for syngas production. Metal-organic frameworks (MOFs) have demonstrated significant potential in photocatalytic syngas conversion, although the impact of catalytic reactions on tunable H 2 /CO ratios remains unclear. Herein, we present a novel bimetallic NiCo-MOF catalyst, Ni 0.4 Co 0.6 , exhibiting high catalytic activity in syngas conversion due to the CO product self-drive effect. Our investigation, integrating experimental data with density functional theory (DFT) analysis, uncovers a high photocurrent response and a low charge-transfer resistance. Furthermore, the introduction of cobalt into Ni-MOF caused an upshift of the d -band center, which facilitated the conversion efficiency of *COOH intermediates, which has been identified as the rate-determining step in CO 2 conversion, resulting in increased CO yield. Additionally, the concentration of undesorbed CO rises, while CO co-adsorption diminishes the catalyst’s binding energy for *H, thereby enhancing H 2 generation. These combined effects contribute to a self-driven enhancement in the catalytic production of syngas. By adjusting the Ni/Co ratio, a tunable H 2 /CO ratio (0.21–0.85) was achieved, with Ni 0.4 Co 0.6 exhibiting optimal catalytic performance, yielding 17.6 mmol·g −1 ·h −1 gas products. This study provides a novel insight into the correlation between reaction products and catalyst design, offering a perspective on perspective on modulating syngas composition.
研究领域:
化学工程
·
材料科学
·
催化反应
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）