Experimental and Theoretical Investigation of Interfacial Engineering in FeO/NiFeO Heterostructures toward the Cycloaddition of CO with Styrene Oxide.

The chemical fixation of CO into epoxides for the synthesis of cyclic carbonates is an appealing solution to both reduce global CO emission and produce fine chemicals, but it is still a prime challenge to develop a low-cost, earth-abundant, yet efficient solid catalyst. Herein, FeO/NiFeO heterostructures are facilely constructed for the highly efficient cycloaddition of CO with styrene oxide (SO) to produce styrene carbonate (SC). Both experimental findings and density functional theory (DFT) calculations substantiate the prominent electron transfer and charge redistribution within the heterointerfaces between the biphasic components, which induce a unique interfacial microenvironment that can facilitate the adsorption and activation of SO.

Manipulation of Electronic Effect and Assembly Architecture to Invoke Oxidation of Ethylbenzene by Hierarchical CoO Wreaths.

A high-performance transition-metal oxide catalyst can be designed by appropriately integrating the concepts of morphology regulation and electronic structure modulation. In this work, hierarchical CoO wreaths (CCW) enriched with oxygen vacancies (Ov) were facilely constructed for the selective oxidation of ethylbenzene (EB) to acetophenone (AP). Under the screened optimal reaction conditions, the CCW catalyst can offer a 79.

Hexavalent Chromium Reduction Mediated by Interfacial Electron Transfer over the Co@NC Nanosheet-Assembled Microflowers.

The reductive transformation of Cr(VI) into Cr(III) mediated by formic acid with efficient, stable, and cost-effective catalysts is a promising strategy for remediating Cr(VI) contamination. Herein, we report the facile construction of uniform Co@NC nanosheet-assembled microflowers for the reduction of Cr(VI). Both experimental results and density functional theory (DFT) calculations reveal the vital role of the intensive interfacial electronic interaction between Co nanoparticles and the N-doped carbon layer in facilitating the anchoring and dispersion of Co nanoparticles within the carbon framework.

Coupled Interface and Oxygen-Defect Engineering in CoO/CoMoO Heterostructures toward Active Oxidation of Ethylbenzene.

The catalytic oxidation of ethylbenzene (EB) is a promising route to produce acetophenone (AcPO). Unfortunately, it remains a great challenge to achieve the highly efficient oxidation of EB under solvent-free conditions using molecular oxygen as the sole oxidant. In this contribution, we present a facile strategy to construct hierarchical oxygen vacancy-rich CoO/CoMoO heterostructures (Vö-CCMO), which delivers a high yield value of 74.

Constructing a Pd-Co Interface to Tailor a d-Band Center for Highly Efficient Hydroconversion of Furfural over Cobalt Oxide-Supported Pd Catalysts.

Cobalt is an alternative catalyst for furfural hydrogenation but suffers from the strong binding of H and furan ring on the surface, resulting in low catalytic activity and chemoselectivity. Herein, by constructing a Pd-Co interface in cobalt oxide-supported Pd catalysts to tailor the d-band center of Co, the concerted effort of Pd and Co boosts the catalytic performance for the hydroconversion of furfural to cyclopentanone and cyclopentanol. The increased dispersion of Pd on acid etching CoO promotes the reduction of Co to Co by enhancing hydrogen spillover, favoring the creation of the Pd-Co interface.

Heterostructured VO/FeVO for enhanced liquid-phase epoxidation of cyclooctene.

Efficient cyclooctene epoxidation process under mild reaction conditions highly relies on the rational design and synthesis of high-performance heterogeneous catalysts. Herein, we report the facile one-pot synthesis of VO/FeVO heterostructures featured with heterointerfaces for the boosted epoxidation of cyclooctene. The intensive interfacial electronic interaction between the VO and FeVO phases is versatile in the modulation of coordination microenvironment and formation of abundant oxygen vacancies, contributing to the performance enhancement.

Promoted selective oxidation of ethylbenzene in liquid phase achieved by hollow CeVO microspheres.

Herein, we developed a series of CeVO samples with hierarchical hollow microsphere-like structure obtained at different calcination temperatures for the selective oxidation of ethylbenzene (EB) to acetophenone (AcPO) in the presence of TBHP. The optimized catalyst (CVO-500) exhibits a very high yield value of 95.0% (initial reaction rate of 49.

Pumpkin-derived N-doped porous carbon for enhanced liquid-phase reduction of 2-methyl-4-nitrophenol.

Metal-free catalysts with environmental friendless, cost-competitiveness and less susceptibility to leaching and poisoning over metal-based catalysts, have revolutionized in the catalysis domain. In this respect, we herein report the first application of cheap and abundant pumpkin-derived N-doped porous carbon for the reduction of 2-methyl-4-nitrophenol assisted by NaBH. The obtained catalyst is cost-competitive, efficient and robust, with an attractive mass-normalized rate constant of 4.

Promotional effect of Mn-doping on the catalytic performance of NiO sheets for the selective oxidation of styrene.

The direct oxidation of styrene into high-value chemicals under mild reaction conditions remains a great challenge in both academia and industry. Herein, we report a successful electronic structure modulation of intrinsic NiO sheets via Mn-doping towards the oxidation of styrene. By doping NiO with only a small content of Mn (Mn/Ni atomic ratio of 0.

Intriguing hierarchical Co@NC microflowers in situ assembled by nanoneedles: Towards enhanced reduction of nitroaromatic compounds via interfacial synergistic catalysis.

Developing highly efficient and cost-effective catalyst with tuned microstructure holds great promise in the reduction of nitroaromatic compounds under mild reaction conditions. Herein, we report a new Co@NC-MF catalyst with a fascinating hierarchical flower-like architecture in situ assembled from uniform Co@NC nanoneedles, which can function as a favorable platform for the efficient reduction of nitroaromatic compounds in the presence of NaBH. In addition with the structural advantage, the characterization and experimental results demonstrate the enormous advantage of interfacial synergistic catalysis in enhancing the catalytic performance.

Boosting styrene epoxidation via CoMnO microspheres with unique porous yolk-shell architecture and synergistic intermetallic interaction.

Achieving satisfactory organic transformation reactions under mild conditions using high-performance catalysts that are composed of cost-effective and earth-abundant elements has always been an aspiration for scientists in the field of catalysis. In this work, CoMnO microspheres with intriguing porous yolk-shell architecture have been constructed by a facile solvothermal reaction and post-calcination treatment, and were employed for the first time in the epoxidation reaction of styrene (SER). Among the series of CoMnO catalysts, the one calcined at 600 °C (CMO-600) displays superior catalytic performance in the SER, achieving an excellent conversion of 97.

Hierarchical hollow nickel silicate microflowers for selective oxidation of styrene.

Developing heterogeneous non-precious metal catalysts that can achieve high catalytic activity and good product selectivity at the same time is still a challenging and interesting work for the selective oxidation of styrene into valuable chemicals from environmental and industrial points of view. Herein, hierarchical hollow nickel silicate (NiSiO(OH)) microflowers assembled from well-defined NiSiO(OH) nanosheets have been prepared by a facile one-pot hydrothermal method. The intriguing structure endows the hollow NiSiO(OH) microflowers a high surface area of 177.

Silver nanoparticles-decorated-CoO porous sheets as efficient catalysts for the liquid-phase hydrogenation reduction of p-Nitrophenol.

Developing proper supports for the anchoring of active metals for various applications has been the focus of high interest over the past decades. Herein, we report the facile construction of Ag nanoparticles (NPs) homogeneously decorated on the CoO porous sheets, which can be employed as an efficient and robust catalyst for the liquid-phase hydrogenation reduction of p-Nitrophenol (PNP). The excellent catalytic performance can be attributed to the synergistic effect of the evenly distributed Ag NPs, the porous structure with high surface area, and the electronic synergy between the Ag NPs and the CoO support.

Density functional theory study of selective aerobic oxidation of cyclohexane: the roles of acetic acid and cobalt ion.

A computational study of cyclohexane autoxidation and catalytic oxidation to a cyclohexyl hydroperoxide intermediate (CyOOH), cyclohexanol, and cyclohexanone has been conducted using a hybrid density functional theory method. The activation of cyclohexane and O is the rate-determining step in the formation of CyOOH due to its relatively high energy barrier of 41.2 kcal/mol, and the subsequent reaction behavior of CyOOH controls whether the production of cyclohexanol or cyclohexanone is favored.

Hollow urchin-like NiO/NiCoO heterostructures as highly efficient catalysts for selective oxidation of styrene.

Three-dimensional (3D) hierarchical hollow urchin-like NiO/NiCoO heterostructures have been prepared via a facile one-pot hydrothermal method. The 3D urchin-like structure brings about high specific surface area of 40.2 m g.

Highly selective oxidation of styrene to benzaldehyde over a tailor-made cobalt oxide encapsulated zeolite catalyst.

A tailor-made catalyst with cobalt oxide particles encapsulated into ZSM-5 zeolites (CoO@HZSM-5) was prepared via a hydrothermal method with the conventional impregnated CoO/SiO catalyst as the precursor and Si source. Various characterization results show that the CoO@HZSM-5 catalyst has well-organized structure with CoO particles compatibly encapsulated in the zeolite crystals. The CoO@HZSM-5 catalyst was employed as an efficient catalyst for the selective oxidation of styrene to benzaldehyde with hydrogen peroxide as a green and economic oxidant.

Metallic cobalt nanoparticles imbedded into ordered mesoporous carbon: A non-precious metal catalyst with excellent hydrogenation performance.

Ordered mesoporous carbon (OMC)-metal composites have attracted great attention owing to their combination of high surface area, controlled pore size distribution and physicochemical properties of metals. Herein, we report the cobalt nanoparticles/ordered mesoporous carbon (CoNPs@OMC) composite prepared by a one-step carbonization/reduction process assisted by a hydrothermal pre-reaction. The CoNPs@OMC composite presents a high specific surface area of 544mg, and the CoNPs are uniformly imbedded or confined in the ordered mesoporous carbon matrix.

Three-dimensional nitrogen-doped graphene foam as metal-free catalyst for the hydrogenation reduction of p-nitrophenol.

Developing metal-free catalysts for various applications has been the focus of high interest over the past decade, especially aiming to replace the expensive noble metal-based catalysts. Herein, a well-defined three-dimensional nitrogen-doped graphene foam (3D-NGF) is synthesized and employed as a metal-free catalyst for the hydrogenation reduction of p-Nitrophenol to p-Aminophenol. The apparent activation energy is calculated, and the reaction mechanism with 3D-NGF as the catalyst for the hydrogenation reduction of p-Nitrophenol is proposed.

Catalytic wet peroxide oxidation of aniline in wastewater using copper modified SBA-15 as catalyst.

SBA-15 mesoporous molecular sieves modified with copper (Cu-SBA-15) were prepared by pH-adjusting hydrothermal method and characterized by X-ray diffraction, BET, transmission electron microscopy, UV-Vis and (29)Si MAS NMR. The pH of the synthesis gel has a significant effect on the amount and the dispersion of copper on SBA-15. The Cu-SBA-15(4.

(E)-1-Ferrocenyl-3-phenyl-prop-2-en-1-one.

The title compound, [Fe(C(5)H(5))(C(14)H(11)O)], exists as the E isomer, and the substituent is fully conjugated with the attached five-membered ring. In the ferrocene unit, the substituted cyclo-penta-dienyl ring (Cps) plane and unsubstituted cyclo-penta-dienyl ring (Cp) plane are almost parallel, and the C atoms in Cp and Cps are in an eclipsed conformation. In the crystal structure, mol-ecules are linked into C(5) chains via inter-molecular C-H⋯O hydrogen bonds, and neighbouring chains are assembled into sheets by inter-molecular C-H⋯π(arene) hydrogen bonds along the c axis.

[Observation of IR spectra from doped SO(2)4- / ZrO2 nanosolid superacid].

In this paper, ZrO(OH)2 was prepared with sol-gel method, then a series of metal-ions-doped SO(2)4- /ZrO2 nanosolid superacids were prepared by impregnated ZrO(OH)2 using diluted H2SO4 and Ni2+ , Al3+, Sn4+, Ag+ , Sn2+ etc. salt solutions. The samples were characterized by IR, XRD, TEM and chemical analysis method.