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Insight into the promotion mechanism of activated carbon on the monolithic honeycomb red mud catalyst

《环境科学与工程前沿(英文)》 2021年 第15卷 第5期 doi: 10.1007/s11783-020-1337-7

摘要:

• Activated carbon was proposed to be an efficient accelerant for molded red mud catalyst.

关键词: NOx     Selective catalytic reduction     Iron-based catalyst     Red mud     Monolithic catalyst     Activated carbon    

Performance and kinetics of iron-based oxygen carriers reduced by carbon monoxide for chemical looping

Xiuning HUA,Wei WANG,Feng WANG

《环境科学与工程前沿(英文)》 2015年 第9卷 第6期   页码 1130-1138 doi: 10.1007/s11783-015-0821-y

摘要: Chemical looping combustion is a promising technology for energy conversion due to its low-carbon, high-efficiency, and environmental-friendly feature. A vital issue for CLC process is the development of oxygen carrier, since it must have sufficient reactivity. The mechanism and kinetics of CO reduction on iron-based oxygen carriers namely pure Fe O and Fe O supported by alumina (Fe O /Al O ) were investigated using thermo-gravimetric analysis. Fe O /Al O showed better reactivity over bare Fe O toward CO reduction. This was well supported by the observed higher rate constant for Fe O /Al O over pure Fe O with respective activation energy of 41.1±2.0 and 33.3±0.8 kJ·mol . The proposed models were compared via statistical approach comprising Akaike information criterion with correction coupled with F-test. The phase-boundary reaction and diffusion control models approximated to 95% confidence level along with scanning electron microscopy results; revealed the promising reduction reactions of pure Fe O and Fe O /Al O . The boosting recital of iron-based oxygen carrier support toward efficient chemical looping combustion could be explained accurately through the present study.

关键词: chemical looping combustion     iron-based oxygen carriers     reduction kinetics     carbon monoxide     statistics    

A review on research and development of iron-based sorbents for removal of hydrogen sulfide from hot

Jianglong YU, Liping CHANG, Fan LI, Kechang XIE

《化学科学与工程前沿(英文)》 2010年 第4卷 第4期   页码 529-535 doi: 10.1007/s11705-010-0519-4

摘要: In poly-generation and integrated gasification-combined cycle (IGCC) systems for clean energy conversion, it is essential to remove impurities such as sulfur species from hot coal gases prior to entering the subsequent units. This paper provides a comprehensive review on previous studies on high temperature removal of hydrogen sulfide from high temperature coal gases using iron-based sorbents. A two-step desulphurization process for hot coal gas cleanup is highlighted, which is integrated with direct production of elemental sulfur during regeneration of iron-based sorbents in the primary desulphurization step. Different kinetic modeling approaches for sulfidation and regeneration were compared. Limited research on activated carbon supported sorbents was also briefly summarized.

关键词: hot coal gas cleanup     iron-based sorbents     sulfidation     regeneration     sulphur recovery    

Modified iron-molybdate catalysts with various metal oxides by a mechanochemical method: enhanced formaldehyde

Xue Liu, Lingtao Kong, Shengtao Xu, Chaofan Liu, Fengyun Ma

《化学科学与工程前沿(英文)》 2021年 第15卷 第5期   页码 1099-1110 doi: 10.1007/s11705-020-2008-8

摘要: A mechanochemical method was employed to prepare modified iron molybdate catalysts with various metal salts as precursors. The physicochemical properties of the iron molybdate catalysts were characterized, and their performances in catalyzing the reaction from methanol to formaldehyde (HCHO) were evaluated. Iron molybdate catalysts doped with Co(NO ) ·6H O and Al(NO ) ·9H O resulted in high HCHO yields. Compared with a commercial catalyst, the HCHO yields in the reaction with the modified catalyst at an optimal Co/Mo molar ratio reached 97.37%. According to chemical state analysis, the formation of CoO and the efficient decrease in the MoO sublimation rate could be important factors enhancing the HCHO yield in reactions catalyzed with iron molybdate doped with different Co/Mo mole ratios.

关键词: iron molybdate catalyst     metal oxides     methanol to formaldehyde     Co/Mo ratio     formaldehyde yield    

A review on sustainable reuse applications of Fenton sludge during wastewater treatment

《环境科学与工程前沿(英文)》 2022年 第16卷 第6期 doi: 10.1007/s11783-021-1511-6

摘要:

• The sustainable approaches related to Fenton sludge reuse systems are summarized.

关键词: Fenton sludge     Heavy metals     Coagulant     Iron source     Heterogeneous catalyst    

Desulfurization performance of iron-manganese-based sorbent for hot coal gas

Xiurong REN, Weiren BAO, Fan LI, Liping CHANG, Kechang XIE

《化学科学与工程前沿(英文)》 2010年 第4卷 第4期   页码 429-434 doi: 10.1007/s11705-010-0504-y

摘要: A series of iron-manganese-based sorbents were prepared by co-precipitation and physical mixing method, and used for H S removal from hot coal gas. The sulfidation tests were carried out in a fixed-bed reactor with space velocity of 2000 h (STP). The results show that the suitable addition of manganese oxide in iron-based sorbent can decrease H S and COS concentration in exit before breakthrough due to its simultaneous reaction capability with H S and COS. Fe O and MnO are the initial active components in iron-manganese-based sorbent, and FeO and Fe are active components formed by reduction during sulfidation. The crystal phases of iron affect obviously their desulfurization capacity. The reducibility of sorbent changes with the content of MnO in sorbent. S7F3M and S3F7M have bigger sulfur capacities (32.68 and 32.30 gS/100 g total active component), while S5F5M has smaller sulfur capacity (21.92 gS/100 g total active component). S7F3M sorbent has stable sulfidation performance in three sulfidation-regeneration cycles and no apparent structure degradation. The sulfidation performance of iron- manganese-based sorbent is also related with its specific surface area and pore volume.

关键词: iron-manganese-based sorbent     sulfidation performance     regeneration     hot coal gas    

Cadmium removal mechanistic comparison of three Fe-based nanomaterials: Water-chemistry and roles of

《环境科学与工程前沿(英文)》 2022年 第16卷 第12期 doi: 10.1007/s11783-022-1586-8

摘要:

● nZVI, S-nZVI, and nFeS were systematically compared for Cd(II) removal.

关键词: Nano zero valent iron     Sulfided zero valent iron     FeS     Cd(II) immobilization     Fe dissolution    

Iron oxide nanoparticle-based theranostics for cancer imaging and therapy

Xiaoqing REN,Hongwei CHEN,Victor YANG,Duxin SUN

《化学科学与工程前沿(英文)》 2014年 第8卷 第3期   页码 253-264 doi: 10.1007/s11705-014-1425-y

摘要: Theranostic platform, which is equipped with both diagnostic and therapeutic functions, is a promising approach in cancer treatment. From various nanotheranostics studied, iron oxide nanoparticles have advantages since IONPs have good biocompatibility and spatial imaging capability. This review is focused on the IONP-based nanotheranostics for cancer imaging and treatment. The most recent progress for applications of IONP nanotheranostics is summarized, which includes IONP-based diagnosis, magnetic resonance imaging (MRI), multimodal imaging, chemotherapy, hyperthermal therapy, photodynamic therapy, and gene delivery. Future perspectives and challenges are also outlined for the potential development of IONP based theranostics in clinical use.

关键词: theranostics     iron oxide nanoparticles     MRI     drug delivery     photothermal therapy     photodynamic therapy    

Revealing the GHG reduction potential of emerging biomass-based CO utilization with an iron cycle system

《环境科学与工程前沿(英文)》 2023年 第17卷 第10期 doi: 10.1007/s11783-023-1727-8

摘要:

● Greenhouse gas mitigation by biomass-based CO2 utilization with a Fe cycle system.

关键词: Carbon dioxide utilization     Hydrothermal reactions     Biomass-based CO2 reduction     Simulation     Ex-ante LCA    

Effect of glow discharge plasma on rhodium-based catalyst for oxygenates synthesis

HUANG Lihong, CHU Wei, XU Junqiang, HONG Jingping, YI Min

《化学科学与工程前沿(英文)》 2007年 第1卷 第1期   页码 16-19 doi: 10.1007/s11705-007-0004-x

摘要: Rhodium-based catalysts were prepared by impregnation, treated with glow discharge plasma, characterized by X-ray diffraction, X-ray photoelectron spectroscopy, H2 temperature-programmed reduction, H2 temperature-programmed desorption and CO temperature-programmed desorption, and investigated for oxygenate synthesis from CO hydrogenation. Based on the characterization results, plasma treatment endowed the samples with smaller particle size, higher dispersion of active components, and an enrichment of active components on the surface as well. As a result, the reducibility and adsorption properties were modified. In catalytic tests, the catalytic activity for CO hydrogenation over the samples treated by plasma was improved remarkably: the conversion of CO and the yield of oxygenates increased at most by a factor of 78.62% and 51.96%, respectively, while the selectivity of ethanol and methanol in the oxygenates was enhanced as well.

Exploration of the oxygen transport behavior in non-precious metal catalyst-based cathode catalyst layer

Shiqu CHEN, Silei XIANG, Zehao TAN, Huiyuan LI, Xiaohui YAN, Jiewei YIN, Shuiyun SHEN, Junliang ZHANG

《能源前沿(英文)》 2023年 第17卷 第1期   页码 123-133 doi: 10.1007/s11708-022-0849-1

摘要: High cost has undoubtedly become the biggest obstacle to the commercialization of proton exchange membrane fuel cells (PEMFCs), in which Pt-based catalysts employed in the cathodic catalyst layer (CCL) account for the major portion of the cost. Although non-precious metal catalysts (NPMCs) show appreciable activity and stability in the oxygen reduction reaction (ORR), the performance of fuel cells based on NPMCs remains unsatisfactory compared to those using Pt-based CCL. Therefore, most studies on NPMC-based fuel cells focus on developing highly active catalysts rather than facilitating oxygen transport. In this work, the oxygen transport behavior in CCLs based on highly active Fe-N-C catalysts is comprehensively explored through the elaborate design of two types of membrane electrode structures, one containing low-Pt-based CCL and NPMC-based dummy catalyst layer (DCL) and the other containing only the NPMC-based CCL. Using Zn-N-C based DCLs of different thickness, the bulk oxygen transport resistance at the unit thickness in NPMC-based CCL was quantified via the limiting current method combined with linear fitting analysis. Then, the local and bulk resistances in NPMC-based CCLs were quantified via the limiting current method and scanning electron microscopy, respectively. Results show that the ratios of local and bulk oxygen transport resistances in NPMC-based CCL are 80% and 20%, respectively, and that an enhancement of local oxygen transport is critical to greatly improve the performance of NPMC-based PEMFCs. Furthermore, the activity of active sites per unit in NPMC-based CCLs was determined to be lower than that in the Pt-based CCL, thus explaining worse cell performance of NPMC-based membrane electrode assemblys (MEAs). It is believed that the development of NPMC-based PEMFCs should proceed not only through the design of catalysts with higher activity but also through the improvement of oxygen transport in the CCL.

关键词: proton exchange membrane fuel cells (PEMFCs)     non-precious metal catalyst (NPMC)     cathode catalyst layer (CCL)     local and bulk oxygen transport resistance    

2-Aminopyridine functionalized cellulose based Pd nanoparticles: An efficient and ecofriendly catalyst

Peibo Hu,Yahao Dong,Xiaotian Wu,Yuping Wei

《化学科学与工程前沿(英文)》 2016年 第10卷 第3期   页码 389-395 doi: 10.1007/s11705-016-1575-1

摘要: A palladium catalyst supported on 2-aminopyridine functionalized cellulose was synthesized and fully characterized by inductively coupled plasma atomic emission spectroscopy, transmission electron microscope, Fourier transform infrared spectroscopy, thermogravimetric analysis and X-ray photoelectron spectrometry. This catalyst can be applied in the Suzuki cross-coupling reaction of aryl halides with arylboronic acids in 50% ethanol to afford biaryls in?good yields, and easily recycled by simple filtration after reaction without the loss of metal Pd.

关键词: cellulose-supported     2-aminopyridine     palladium nanoparticles     ecofriendly catalyst     Suzuki cross-coupling reaction    

Research Trends in Fischer--Tropsch Catalysis for Coal to Liquids Technology

Emiel J. M. Hensen,Peng Wang,Wayne Xu

《工程管理前沿(英文)》 2016年 第3卷 第4期   页码 321-330 doi: 10.15302/J-FEM-2016051

摘要: Fischer–Tropsch Synthesis (FTS) constitutes catalytic technology that converts synthesis gas to synthetic liquid fuels and chemicals. While synthesis gas can be obtained from any carbonaceous feedstock, current industrial FTS operations are almost exclusively based on natural gas. Due to the energy structure of China where cheap coal is abundant, coal to liquids (CTL) technology involving coal gasification, FTS and syncrude upgrading is increasingly being considered as a viable option to convert coal to clean transportation fuels. In this brief paper, we review some pertinent issues about Fe- and Co-based FTS catalysts. Fe is better suited to convert synthesis gas derived from coal gasification into fuels. The authors limit themselves to noting some important trends in the research on Fe-based catalysts. They focus on the preparation of phase-pure carbides and innovative cheap synthesis methods for obtaining active and stable catalysts. These approaches should be augmented by (1) computational investigations that are increasingly able to predict not only mechanism, reaction rates and selectivity but also optimum catalyst composition, as well as (2) characterization of the catalytic materials under conditions close to the operation in real reactors.

关键词: Fischer–Tropsch     FTS     CTL     Fe catalyst     iron carbide     computational modeling    

Validation of polymer-based nano-iron oxide in further phosphorus removal from bioeffluent: laboratory

Ming HUA, Lili XIAO, Bingcai PAN, Quanxing ZHANG

《环境科学与工程前沿(英文)》 2013年 第7卷 第3期   页码 435-441 doi: 10.1007/s11783-013-0508-1

摘要: The efficient removal of phosphorous from water is an important but challenging task. In this study, we validated the applicability of a new commercially available nanocomposite adsorbent, i.e., a polymer-based hydrated ferric oxide nanocomposite (HFO-201), for the further removal of phosphorous from the bioeffluent discharged from a municipal wastewater treatment plant, and the operating parameters such as the flow rate, temperature and composition of the regenerants were optimized. Laboratory-scale results indicate that phosphorous in real bioeffluent can be effectively removed from 0.92 mg·L to<0.5 mg·L (or even<0.1 mg·L as desired) by the new adsorbent at a flow rate of 50 bed volume (BV) per hour and treatable volume of 3500–4000 BV per run. Phosphorous removal is independent of the ambient temperature in the range of 15°C–40°C. Moreover, the exhausted HFO-201 can be regenerated by a 2% NaOH+ 5% NaCl binary solution for repeated use without significant capacity loss. A scaled-up study further indicated that even though the initial total phosphorus (TP) was as high as 2 mg·L , it could be reduced to<0.5 mg·L , with a working capacity of 4.4–4.8 g·L HFO-201. In general, HFO-201 adsorption is a choice method for the efficient removal of phosphate from biotreated waste effluent.

关键词: bioeffluent     phosphorus removal     nanocomposite adsorbent     hydrated ferric oxide    

randomized, controlled, open label non-inferiority trial of intravenous ferric carboxymaltose versus ironsucrose in patients with iron deficiency anemia in China

《医学前沿(英文)》 2024年 第18卷 第1期   页码 98-108 doi: 10.1007/s11684-023-1001-2

摘要: Iron deficiency (ID) and ID anemia (IDA) pose significant public health concerns in China. Although iron sucrose (IS) treatment is well-established in the country, ferric carboxymaltose (FCM) offers the advantage of higher doses and fewer infusions. This open label, randomized, controlled, non-inferiority trial was conducted at multiple sites in China to compare the outcomes of FCM (maximum of 2 doses, 500 or 1000 mg iron) and IS (up to 11 infusions, 200 mg iron) treatments in subjects with IDA. The primary endpoint was the achievement of hemoglobin (Hb) response (an increase of ≥2 g/dL from baseline) within 8 weeks, whereas secondary endpoints included changes in Hb, transferrin saturation, and serum ferritin levels. Among the 371 randomized subjects, a similar percentage of subjects treated with FCM and IS achieved Hb-response (FCM 99.4%, IS 98.3%), thereby confirming the non-inferiority of FCM compared with IS (difference 1.12 (−2.15, 4.71; 95% confidence interval (CI))). Furthermore, a significantly higher proportion of FCM-treated subjects achieved early Hb-response at Week 2 (FCM 85.2%, IS 73.2%; difference 12.1 (3.31, 20.65; 95% CI)). Additionally, the increase in TSAT and serum ferritin levels from baseline was significantly greater at all time points for FCM-treated subjects. The safety profiles of FCM and IS were comparable, with the exception of transient hypophosphatemia and pyrexia, which are consistent with FCM’s known safety profile. In conclusion, FCM proves to be an efficacious treatment for IDA, providing faster Hb-response and correction of ID with fewer administrations than IS.

关键词: iron deficiency     anemia     intravenous iron     ferric carboxymaltose     iron sucrose     Hb response     early response    

标题 作者 时间 类型 操作

Insight into the promotion mechanism of activated carbon on the monolithic honeycomb red mud catalyst

期刊论文

Performance and kinetics of iron-based oxygen carriers reduced by carbon monoxide for chemical looping

Xiuning HUA,Wei WANG,Feng WANG

期刊论文

A review on research and development of iron-based sorbents for removal of hydrogen sulfide from hot

Jianglong YU, Liping CHANG, Fan LI, Kechang XIE

期刊论文

Modified iron-molybdate catalysts with various metal oxides by a mechanochemical method: enhanced formaldehyde

Xue Liu, Lingtao Kong, Shengtao Xu, Chaofan Liu, Fengyun Ma

期刊论文

A review on sustainable reuse applications of Fenton sludge during wastewater treatment

期刊论文

Desulfurization performance of iron-manganese-based sorbent for hot coal gas

Xiurong REN, Weiren BAO, Fan LI, Liping CHANG, Kechang XIE

期刊论文

Cadmium removal mechanistic comparison of three Fe-based nanomaterials: Water-chemistry and roles of

期刊论文

Iron oxide nanoparticle-based theranostics for cancer imaging and therapy

Xiaoqing REN,Hongwei CHEN,Victor YANG,Duxin SUN

期刊论文

Revealing the GHG reduction potential of emerging biomass-based CO utilization with an iron cycle system

期刊论文

Effect of glow discharge plasma on rhodium-based catalyst for oxygenates synthesis

HUANG Lihong, CHU Wei, XU Junqiang, HONG Jingping, YI Min

期刊论文

Exploration of the oxygen transport behavior in non-precious metal catalyst-based cathode catalyst layer

Shiqu CHEN, Silei XIANG, Zehao TAN, Huiyuan LI, Xiaohui YAN, Jiewei YIN, Shuiyun SHEN, Junliang ZHANG

期刊论文

2-Aminopyridine functionalized cellulose based Pd nanoparticles: An efficient and ecofriendly catalyst

Peibo Hu,Yahao Dong,Xiaotian Wu,Yuping Wei

期刊论文

Research Trends in Fischer--Tropsch Catalysis for Coal to Liquids Technology

Emiel J. M. Hensen,Peng Wang,Wayne Xu

期刊论文

Validation of polymer-based nano-iron oxide in further phosphorus removal from bioeffluent: laboratory

Ming HUA, Lili XIAO, Bingcai PAN, Quanxing ZHANG

期刊论文

randomized, controlled, open label non-inferiority trial of intravenous ferric carboxymaltose versus ironsucrose in patients with iron deficiency anemia in China

期刊论文