Nengjie Feng's research while affiliated with Nanjing Tech University and other places
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Publications (52)
Artificial photosynthesis of fuels has garnered significant attention, with SrTiO3 emerging as a potential candidate for photocatalysis due to its exceptional physicochemical properties. However, selectively converting CO2 into fuels with desired reaction products remains a grand challenge. Herein, we design an updated method via an aging strategy...
Artificial photosynthesis of fuels has garnered significant attention, with SrTiO 3 emerging as a potential candidate for photocatalysis due to its exceptional physicochemical properties. However, selectively converting CO 2 into fuels with desired reaction products remains a grand challenge. Herein, we design an updated method via an aging strateg...
Manganese oxides for catalytic combustion of VOCs are high profile owing to their excellent redox properties and oxygen storage capacities, while the precise regulation of microstructure to improve the activity remains challenging. Herein, imidazolium-based ionic liquids are employed as the template agents to synthesize a range of MnO2 for differen...
The exposed crystal facets are crucial to heterogeneous catalysis. Herein, the facet controlled Ce1-xLaxOδ (0≤x≤0.30) nanocomposites have been constructed elaborately via a hydrothermal route and used for soot abatement. The catalysts were characterized by XRD, TEM, Raman, FT-IR, XPS, H2-TPR, and so forth. With the increasing content of La³⁺, part...
Catalytic fixation of greenhouse gas CO2 into value-added chemicals under mild conditions was deemed as an effective pathway for carbon emissions mitigation, though facing big challenges. Herein, a novel hydroxyl-ionic liquid functionalized metalloporphyrin (ZnTpyp-IL) catalyst bearing hydrogen bond donor (HBD), Lewis acidic and nucleophilic sites...
In this work, Ag-Ce modified 3DOM LaMnO3 catalysts were first synthesized by redox etching precipitation and used for NOx-assisted soot oxidation. Compared with wetness impregnation method, Ag introduced by redox etching precipitation method showed smaller size and stronger interaction with 3DOM LaMnO3, thus presented better catalytic performance....
Herein, a series of K, Ce modified 3DOM LaMnO3 catalysts, named K/xCe/LM (x = 0, 10, 15 and 20 wt%) had been prepared and used for NOx-assisted soot oxidation. 3DOM LaMnO3 employed as the matrix could offer an ideal environment to hinder the agglomeration of CeO2. Meanwhile, introducing CeO2 on the surface of LaMnO3 would drive the generation of Mn...
A well dispersed magnetically separable palladium complex (MNPs-phenanthroline-Pd) has been synthesized via the immobilization of palladium (II) complex on the surface of silica-coated magnetic nanoparticles modified with phenanthroline ligand. The as-fabricated MNPs-phenanthroline-Pd nanocatalyst was well characterized a series of spectroscopic te...
A ternary copolymerized poly(ionic liquid) of bis-imidazolium-based ionic liquid and crosslinking agents (divinylbenzene (DVB), N, N’-methylene bisacrylamide (MBA)) was rationally designed as versatile precursor to synthesize nitrogen-doped porous carbons by self-templating method for efficient CO2 separation. The ionic liquid monomer and MBA could...
Catalytic combustion is one of the most effective soot elimination technologies, whereby the development of catalyst with high performance and stability becomes the emphasis. Herein, we elaborately fabricated an innovative catalyst of K-Cu decorated 3DOM La0.8Sr0.2MnO3 perovskite called 5KxCLSM for soot combustion, in which Cu species were introduc...
A series of manganese dioxide have been synthesized by ionic liquid assisted hydrothermal method and used for propane combustion. 1-butyl-3-methylimidazolium tetrafluoroborate [BMIM-BF4] was selected as the structure-directing agent, which could generate extended hydrogen bonds under hydrothermal conditions. These hydrogen bonds could be used for e...
The emission of soot and NOx is one of the most severe environmental issues, and the key factor is the development of catalysts in after-treatment systems. In this study, an innovative non-noble metal catalyst, named HKLSM, was fabricated by etching 3DOM La0.8Sr0.2MnO3 with citric acid and synchronously anchoring potassium salt, for soot and NOx si...
Construction of an efficient and separable Bronsted acid catalyst to realize one-pot conversion from low-value oils to biodiesel has been a hot and difficult spot in recent years. Herein, a novel magnetically recyclable catalyst was fabricated by grafting the sponge-like structure of poly (ionic liquid) on the surface of support Fe3O4/SiO2. The gra...
The Co−Mn mixed metal oxide was firstly fabricated using Co(NO3)2, KMnO4 and K2CO3. The tuned catalysts, donated as xM‐Co3Mn1 (x=0, 0.025, 0.05 and 0.1), were synthesized by selective dissolve method (SD). The physicochemical properties induced by different acid concentrations on catalysts were explored via a series of characterization techniques....
The construction of porous perovskite nanotubular materials with a good intrinsic activity, as well as a greater dispersion of the active sites is an effective strategy to obtain a high-performance catalyst used in soot removal. Thence, macro-mesoporous Co3O4-La0.88Sr0.12CoO3-δ nanotubes with large specific surface area (154.4 m²·g⁻¹) from the acid...
The porous perovskite-type La0.6Sr0.4CoO3-δ nanotubes are synthesized by sol-gel method combined with electrospinning technique following the calcination, while the porous nanotubular structure can increase the utilization of active sites related to the catalytic activity in soot oxidation. In order to further improve the catalytic activity, porous...
CeO2@MnO2 nanocomposite oxide with trepang-like hierarchical structure was prepared by hydrothermal method followed by calcination using Ce(OH)CO3 and KMnO4 as the precursor. The catalyst was characterized by several techniques and investigated for soot oxidation. During the hydrothermal process, KMnO4 could oxidize Ce(OH)CO3 into CeO2, accompanyin...
To improve the catalytic activity when utilizing metal oxides for the combustion of VOCs, Mn/Al-SBA-15 catalysts have been successfully synthesized through an emerging wetness impregnation technique involving Mn(NO3)2 on Al-SBA-15, which has been directly prepared from attapulgite by a hydrothermal method. Compared to Mn/SBA-15, which is prepared w...
Series of ordered mesoporous CexMn1-xOδ (x = 0, 0.1, 0.3, 0.5) were successfully prepared with a hard template method using KIT-6. Among the mesoporous CexMn1-xOδ catalysts, the rutile β-Ce0.1Mn0.9Oδ supports exhibited excellent catalytic activity for toluene oxidation. On basis of these, the effects of MOx (M = Co, Cu, Fe) on Ce0.1Mn0.9Oδ catalyst...
The perovskite-type La0.9K0.1CoO3-δ nanofibers were fabricated in success using electrospinning technique with calcination, based on the successful preparation of LaCoO3 nanofibers considering the enhancement in the activity by K+, which could facilitate the oxygen species transferring and accelerate the redox circulation. Furthermore, the hollow s...
Improving the accessible reaction sites of catalysts is vital to diesel soot elimination. Herein, hierarchical brush-like α-MnO2&Co3O4 nanoarrays were in-situ grown on AISI304 stainless steel wire-mesh via a two-step hydrothermal method. Morphology investigation displayed that compared with sole α-MnO2 or Co3O4 nanoarrays, α-MnO2&Co3O4 nanoarrays p...
As a result of the low partial pressure of CO2 in most industrial waste gases, capturing CO2 especially at low pressure was a priority. A facile method was utilized to build mesoporous UiO-66s with adjustable pore sizes via crystal defect engineering. The mesopores were generated through the removal of instable Cu clusters and lauric acid after rea...
The core-shell structured Co-Z@TiO2 (N2+O2) catalyst, which was prepared by subsequent pyrolysis and calcination from precursor ZIF-67 coated by amorphous TiO2, was applied in Fischer-Tropsch synthesis (FTS). Compared with Co-Z@TiO2 catalyst which was directly calcinated in air (Co-Z@TiO2 (O2)) or pyrolyzed in N2 (Co-Z@TiO2 (N2)), the Co-Z@TiO2 (N2...
Guided by oxidation-reduction reactions, we in-situ grew MnO 2 coating on three novel 3D structured foams, Ni, Fe and Fe 75 Ni 25 (written as MN, MF and MFN) for diesel soot elimination. Systematic characterizations including SEM, HRSTEM-EDS, XRD, Raman spectroscopy, FT-IR, XPS, H 2 -TPR and soot-TPR revealed that the substrates affected greatly th...
The PrBa 0.5 Sr 0.5 Co 0.2 Fe 1.8 O 5+δ double perovskite porous nanotubular webs are prepared by a simple electrospinning technique following calcination. It shows better catalytic activity compared with the bulk PrBa 0.5 Sr 0.5 Co 0.2 Fe 1.8 O 5+δ prepared by citrate method, due to its larger specific surface area and higher utilization of active...
A facile strategy to construct the N-enriched hierarchically porous carbon nanosheets was developed while the bis-vinylimidazolium based poly(ionic liquids) (PIL-Ac) served as ideal carbon precursors and zinc acetate (Zn(Ac) 2 ) as a potent template based on Zn(Ac) 2 /PIL-Ac coordination interaction. Interestingly, the pore structure of PNCs could...
Three-dimensionally ordered macroporous (3DOM) La0.5Sr0.5MnO3 perovskite was prepared by colloidal crystal templating method and extra mesopores were created by selective dissolution method successively. The acid-nonresistant Sr cations acting as self-template were dissolved by dilute nitric acid, making overstoichiometric Mn spill to the surface o...
Targeting CO 2 capture at low pressure due to the partial pressure of CO 2 in flue gases (0.01 MPa–0.02 MPa), a facile method was constructed to build functional UiO-66 structure via mixing ligands of terephthalic acid and 1,2,4-benzenetricarboxylic acid. The free -COOH from 1,2,4-benzenetricarboxylic acid could graft quantitative and dispersive de...
Manganese Oxides (MnOx) growing on AISI304 stainless steel wire-mesh monoliths with excellent catalytic performance and firm adhesion were synthesized via a hydrothermal route. The effect of calcination temperatures was deeply investigated. Systematic characterizations including XRD, Raman spectra, FT-IR, N2 adsorption-desorption, SEM, HRSTEM-EDS,...
The soot particulates emitted from diesel engines have been ultimately evidenced cancerogenic and successive rigorous emission legislations have been approved in many countries. Monolithic metal-based purification materials are able to tackle the harsh working conditions. Hence, monolithic birnessite MnO2/Ni foam catalysts were facilely synthesized...
Three-dimensionally ordered macroporous (3DOM) perovskite catalysts possessing sufficient contact points are conducive to polishing catalytic combustion of soot. In this work, 3DOM Sr1-xKxTiO3 (x=0, 0.1, 0.2, 0.3) perovskite-type catalysts were prepared through colloidal crystal templating method. The as-prepared samples were analyzed by FESEM, TEM...
Perovskite-type macro/mesoporous nanotube shows large specific surface area and high utilization of catalytic sites, which gives rise to the enhancement of catalytic activity and broaden their application. In this work, perovskite-type La1-xKxFeO3-δ nanotubes were prepared for efficient soot oxidation by a simple electrospinning technique following...
Targeting CO2capture application, a new strategy for building multiple adsorption sites in metal-organic framework MIL-101(Cr) was constructed through the incorporation of diethylenetriamine-based ionic liquid (DETA-Ac) via a post-synthetic modification approach. The DETA-Ac, with multi-amine-tethered cation and acetate anion, could not only provid...
A novel hybrid material constituted of MIL-101(Cr) and mesoporous silica was successfully assembled through an in-situ hydrothermal method. The MCM-41 with well-ordered mesopores acted as the structure-directing agent, which regulated the growth of MIL-101(Cr) crystals along a certain direction and restricted the expansion of framework. Meanwhile,...
The HKUST-1@SBA-15 composites with hierarchical pore structure were constructed by in situ self-assembly of metal-organic framework (MOF) with mesoporous silica. The structure directing role of SBA-15 had an obvious impact on the growth of MOF crystals, which in turn affected the morphologies and structural properties of the composites. The pristin...
La1-xCexCrOδ (0 ≤ x ≤ 0.3) composite oxides with three-dimensionally ordered macroporous (3DOM) structures were constructed by a colloidal crystal template method and characterized via XRD, FT-IR, FESEM, N2 adsorption-desorption, XPS, H2-TPR, and O2-TPD techniques. The catalytic performances of the as-prepared samples for soot oxidation were furthe...
Three-dimensionally ordered macroporous (3DOM) La0.8Ce0.2FeO3 perovskite was successfully constructed through a colloidal crystal template way. And the K-Mn/3DOM La0.8Ce0.2FeO3 catalyst was obtained by an incipient-wetness impregnation method. The physicochemical characterizations of the material were conducted by means of XRD, FESEM, TEM, N2 adsor...
Three-dimensionally ordered macroporous (3DOM) silicon-doped La0.8K0.2CoO3 perovskite catalysts were prepared by a colloidal crystal templating method. The as-prepared samples were characterized by XRD, FT-IR, FESEM, N2 adsorption-desorption, XRF, XPS and H2-TPR techniques to investigate the physical-chemical properties of the catalysts. The silica...
MnO2 nanocomposites with porous structure were successfully synthesized by a facile hydrothermal route from KMnO4 without the addition of any acid. Among CeO2, CuO and Co3O4, an accelerated synthesis of MnO2 assisted by CeO2 was observed, which contributed to the redox transformation between Ce3+ and Mn7+. The as-prepared catalysts were characteriz...
Mg-substituted La0.8Ce0.2CoO3 (LCCM) perovskite oxides with large surface areas (148.7 m2/g) were prepared by a modified citric acid complexation method. Then, K promoted LCCM catalysts were synthesized via impregnation. The samples were characterized by XRD, FT-IR, N2 adsorption-desorption, SEM, TEM, XPS and TG/DTA techniques. The addition of Mg n...
Three-dimensionally ordered macroporous (3DOM) La0.8Ce0.2Mn1-xFexO3 perovskites were successfully prepared by colloidal crystal template method and KNO3-supported 3DOM La0.8Ce0.2Mn1-xFexO3 catalysts were prepared by wetness impregnation method. Physicochemical properties of these catalysts were characterized by XRD, FT-IR, FESEM, TEM, BET, H2-TPR,...
Three-dimensionally ordered macroporous (3DOM) La1-xCexFe1-yCoyO3 (x = 0-0.4, y = 0-0.6) perovskite catalysts were successfully prepared by colloidal crystal templating method and employed for soot combustion. The morphology, structure, and redox properties of the catalysts were characterized by XRD, FT-IR, SEM, BET, UV-Vis DRS, XPS, O2-TPD and H2-...
K and Mg substituted perovskite catalysts La-1 (-) xKxCo1 (-) yMgyO3 (x = 0-0.4, y = 0-0.2) for soot combustion were prepared by citric acid complexation and characterized by XRD, FT-IR, SEM, TEM, EDS, H-2-TPR, XPS and TG. Soot combustion was remarkably accelerated when K was introduced into LaCoO3. Then Mg was doped into the K substituted LaCoO3,...
Citations
... While, after the addition of Ru, the above two peaks both shifted to lower temperatures with the peak at 278 • C becoming the main peak and that at 327 • C becoming the shoulder peak. These results indicated the enhanced interaction between RuO x and δ-MnO 2 [ 30]. As the Ru content increased to 1wt%, the peak at 278 • C and 327 • C shifted to lower temperatures at 229 • C and 279 • C, respectively. ...
... Fe-Mn bimetallic oxides exhibit super-catalytic oxidation activities owing to the synergistic effect between MnO x and FeO x [16,17]. Ren et al. [18] prepared MnO 2 -decorated iron-manganese composite oxides via combining hydrolysis driving redox reaction and hydrothermal method, and claimed that the highest activity was achieved over the bayberry-like 3MnO 2 /5Mn1Fe catalyst with T 90 of 233 °C. Chen et al. [19] prepared a class of homogeneous Fe-Mn oxides by hydrolysisdriven redox method, and found that toluene removal efficiency by Fe-Mn oxides is 100% at 215 °C at WHSV of 20,000 mL/g / h. ...
... The selectivity for isoheptane decreased with increasing reaction temperature, and high temperatures irreversibly damaged the structure of some catalysts. 33 The rate of hydrocracking reaction increased at higher temperatures. 4 The selectivity order of catalysts was 2%MoO x -Pd/Ce-M > 1%MoO x -Pd/Ce-M > 3%MoO x -Pd/Ce-M > Pd/Ce-MCM-48. ...
... Copper doping into CeO 2 (Cu-CeO 2 ) can generate abundant structure defects that can enhance catalytic oxidation activity [17,18]. According to the literature, many studies on designing Cu-CeO 2 catalysts suggest that it is possible to obtain a catalyst with selective exposed crystal facets, a three-dimensionally ordered macroporous structure, particle-based and with a nanoarray structure [19,20]. Furthermore, Cu-CeO 2 catalyst with an Cu/Ce atomic ratio of 1 is most active in catalyzing the combustion of diesel soot [21]. ...
... The following supporting information can be downloaded at https: //www.mdpi.com/article/10.3390/catal14020135/s1, Table S1: Comparative studies of catalytic activity for soot oxidation among various materials and our designed catalysts [15,[37][38][39][40][41][42][43][44][45][46][47]; Figure S1: Cycled soot oxidation profiles of 3Ag/SMO. Reaction conditions: 10% O 2 /N 2 , GHSV = 100,000 h −1 , heating rate = 5 • C/min [51-54]; Figure S2: C 1s spectra for the catalysts [40]. ...
... To gain a deeper understanding of the reaction mechanism of model reaction of CO 2 with ECH, detailed kinetic studies were carried out in the temperature range 40-70 • C. Based on the reaction rate theory and following the previous reports [67,[91][92][93], the reaction was assumed to be a pseudo-first order reaction for ECH and the corresponding reaction rate equations (Eq. respectively; k and k obs represent the reaction rate constant. ...
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... This indicated that these peaks in H 2 -TPR profiles should be assigned to the reduction of high valence manganese to Mn 2+ , mainly proceeding along the reduction process of Mn 4+ → Mn 3+ → Mn 2+ , 47 i.e., the multimodal reduction process of MnO 2 → Mn 2 O 3 → Mn 3 O 4 → MnO. 50 Commonly, the peaks below ∼300°C were assigned to the reduction from Mn 4+ species to Mn 3+ , and the peaks above 300°C were assigned to the reduction from Mn 3+ species in different compound forms to Mn 2+ species. The amount of H 2 consumption increased in the order of MnO 2 -IV < MnO 2 -I < MnO 2 -III < MnO 2 -II, in contrast to their deO 3 activity sequence, and the sample that consumed less H 2 generally exhibited a better deO 3 performance. ...
... When it comes to adsorption, whether solid sorbents can be quickly separated from the system is a topic worth thinking about. Considering the mass loss and energy consumption, it is a feasibility measure to endow the adsorbents magnetic and adopt the external magnetic control to improve separation efficiency [24]. Fe 3 O 4 nanoparticles (NPs) appear super paramagnetic at room temperature [25]. ...
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... O surf is the active oxygen species in catalytic oxidation [48]. The formation of active O surf is related to the generation of oxygen vacancies, which is conducive to the adsorption and activation of oxygen molecules [49][50][51]. As a result, when the doping amount of Mn increases, the O surf ratio (O surf /(O surf + O latt )) value increases at first-from 54.17% (Co 3 O 4 ) to 65.33% (Mn 0.05 Co 1 )-and then decreases, suggesting a superior catalytic activity of the Mn 0.05 Co 1 catalyst when compared to other Mn-Co 3 O 4 catalysts. ...
... The catalysts with ordered morphology of the 3DOM-type decrease diffusion limitations of the reactant gases. The developed network of mesopores and/or macropores improves the contact efficiency between the soot particles and the catalysts [32,33]. ...
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