Novel heterogeneous Fe-based catalysts for carbon dioxide hydrogenation to long chain α-olefins-A review.

The thermocatalytic conversion of carbon dioxide (CO) into high value-added chemicals provides a strategy to address the environmental problems caused by excessive carbon emissions and the sustainable production of chemicals. Significant progress has been made in the CO hydrogenation to long chain α-olefins, but controlling C-O activation and C-C coupling remains a great challenge. This review focuses on the recent advances in catalyst design concepts for the synthesis of long chain α-olefins from CO hydrogenation.

Synthesis of Liquid Hydrocarbon via Direct Hydrogenation of CO over FeCu-Based Bifunctional Catalyst Derived from Layered Double Hydroxides.

Here, we report a Na-promoted FeCu-based catalyst with excellent liquid hydrocarbon selectivity and catalytic activity. The physiochemical properties of the catalysts were comprehensively characterized by various characterization techniques. The characterization results indicate that the catalytic performance of the catalysts was closely related to the nature of the metal promoters.

HO Derivatives Mediate CO Activation in Fischer-Tropsch Synthesis: A Review.

The process of Fischer-Tropsch synthesis is commonly described as a series of reactions in which CO and H are dissociated and adsorbed on the metals and then rearranged to produce hydrocarbons and HO. However, CO dissociation adsorption is regarded as the initial stage of Fischer-Tropsch synthesis and an essential factor in the control of catalytic activity. Several pathways have been proposed to activate CO, namely direct CO dissociation, activation hydrogenation, and activation by insertion into growing chains.

Effect of glucose pretreatment on Cu-ZnO-AlO catalyzed CO hydrogenation to methanol.

A series of Cu-ZnO-AlO catalysts (CZA) were prepared by glucose pretreatment and applied for methanol synthesis from CO hydrogenation. The advantages of the glucose pretreatment and the effects of glucose content were investigated by XRD, N physisorption, SEM, NO chemisorption, CO-TPD, H-TPR, TG, and XPS characterization techniques. The influence of glucose pretreatment on the average Cu particle size and the interaction between different components, as well as the effects of the amount of glucose on the Cu specific surface area, the ratio of Cu/Cu and the performance of the catalysts were discussed.

Ratiometric optical detection of pyrophosphate based on aggregation-caused dual-signal response of gold nanoclusters.

Sensing of pyrophosphate ion (PPi) has received much attention due to the strong demand for clinical diagnostics. Here, based on gold nanoclusters (Au NCs), a ratiometric optical detection method for PPi is developed by simultaneously detecting the dual signals of fluorescence (FL) and second-order scattering (SOS). The PPi is detected by inhibiting the formation of aggregates of Fe with Au NCs.

Insight into the Compositional Features of Organic Matter in Xilinguole Lignite through Two Mass Spectrometers.

Ethanolysis of lignite is an effective approach for converting organic matter of lignite to liquid coal derivatives. Xilinguole lignite (XL) was reacted with ethanol at 320 °C. Then ethanol and isometric carbon disulfide/acetone mixture were used to extract the reaction mixture in a modified Soxhlet extractor to afford extractable portion 1 (EP) and extractable portion 2 (EP), respectively.

Selective Conversion of Glycerol to Methanol over CaO-Modified HZSM-5 Zeolite.

Biodiesel is generally produced from vegetable oils and methanol, which also generates glycerol as byproduct. To improve the overall economic performance of the process, the selective formation of methanol from glycerol is important in biodiesel production. In the present study, a CaO modified HZSM-5 zeolite was prepared by an impregnation method and used for the conversion of glycerol to methanol.

5D-QSAR studies of 1H-pyrazole derivatives as EGFR inhibitors.

Epidermal growth factor receptor (EGFR) is highlighted as a target for anticancer treatment. Several EGFR inhibitors were approved in cancer treatment. Comparatively, 5D-QSAR is a new methodology which considers an ensemble of different induced-fit models.

Anti-inflammatory and PTP1B inhibitory sesquiterpenoids from the twigs and leaves of Aglaia lawii.

Twelve sesquiterpenoids with seven different carbon skeletons, including four isodaucanes (1-4), an aromadendrane (5), a guaiane (6), a cadalane (7), two eudesmanes (8 and 9), two bisabolanes (10 and 11), and a megastigmane (12), were isolated from the twigs and leaves of Aglaia lawii (Wight) C. J. Saldanha et Ramamorthy.

Cu/PCN Metal-Semiconductor Heterojunction by Thermal Reduction for Photoreaction of CO-Aerated HO to CHOH and CHOH.

g-CN-based materials show potential for photoreduction of CO to oxygenates but are subjected to fast recombination of photogenerated charge carriers. Here, a novel Cu-dispersive protonated g-CN (PCN) metal-semiconductor (m-s) heterojunction from thermal reduction of a CuO/PCN precursor was prepared and characterized using in situ X-ray diffraction, scanning transmission electron microscopy, X-ray photoelectron spectroscopy, ultraviolet-visible (UV-vis) spectra, photoluminescence (PL) spectra, transient photocurrent response, and electrochemical impedance spectroscopy (EIS). The Cu amount in Cu/PCN and the reduction temperature affected the generation of CHOH and CHOH from the photoreaction of CO-aerated HO.

Cu/ZnVO Heterojunction Interface Promoted Methanol and Ethanol Generation from CO and HO under UV-Vis Light Irradiation.

Adopting the concurrent reduction of CuO during hydrothermal preparation of ZnVO, metal-semiconductor heterojunction Cu/ZnVO nanorods were synthesized and applied to the catalytic generation of methanol and ethanol from CO aerated water under UV-vis light irradiation. 10Cu/ZnVO obtained from 10 wt % composite amount of CuO exhibited a total carbon yield of 6.49 μmol·g·h.

Influence of Ni Precursors on the Structure, Performance, and Carbon Deposition of Ni-AlO Catalysts for CO Methanation.

Three Ni-AlO catalysts were prepared, in planetary ball-milling machine, by the mechanochemical method with Al(NO)·9HO as the aluminum precursor, (NH)CO as the precipitant, and Ni(NO)·6HO, NiCl·6HO, and Ni(CHCOO)·4HO as nickel precursors (the corresponding catalysts were labeled as Ni-NO, Ni-Cl, and Ni-Ac). The prepared catalysts were characterized by X-ray diffraction (XRD), temperature-programmed reduction (H-TPR), and N adsorption-desorption technologies, and CO methanation performance evaluation was carried out for the catalysts. Results showed that the catalyst with Ni(NO)·6HO as the precursor presented good Ni dispersibility and a small Ni grain size of 6.

Molecular dynamics-guided receptor-dependent 4D-QSAR studies of HDACs inhibitors.

Histone deacetylases (HDACs) were highlighted as a novel category of anticancer targets. Several HDACs inhibitors were approved for therapeutic use in cancer treatment. Comparatively, receptor-dependent 4D-QSAR, LQTA-QSAR, is a new approach which generates conformational ensemble profiles of compounds by molecular dynamics simulations at binding site of enzyme.

Efficient hydrogen production at a rationally designed MoSe@CoO p-n heterojunction.

During the past several years, transition metal compounds have shown high activity in the field of photocatalysis. Therefore, the MoSe@CoO with excellent photocatalytic properties through simple hydrothermal and physical mixing methods was prepared. This composite material was composed of n-type semiconductor MoSe and p-type semiconductor CoO.

Preparation of Porous Carbon Materials Derived from Hyper-Cross-Linked Asphalt/Coal Tar and Their High Desulfurization Performance.

The development of simple and highly effective desulfurization technology is attracting more and more interest in both industrial and academic fields. Here, a new family of precursors was prepared based on hyper-cross-linked asphalt and coal tar building blocks. Thanks to the preintroduced porous structure, the precursors were converted into carbons with high surface area and large micropore volume via a uniform carbonization process.

Structurally diverse halosesquiterpenoids from the red alga Laurencia composita Yamada.

A phytochemical investigation on the MeOH extract of the red alga Laurencia composita Yamada led to the discovery of six new highly halogenated sesquiterpenoids, including two bisabolane-type sesquiterpenoids (1 and 2), one nerolidol derivative (7), and three chamigrane-type sesquiterpenoids (9, 10, and 18), together with 13 known sesquiterpenoids. Their structures, including relative configuration, were elucidated by extensive spectroscopic analysis, and by comparison with data for related known compounds. The absolute configuration at C-10 of laurecomposin A (1) was determined by the modified Mosher's method.

Spinel-structure catalyst catalyzing CO hydrogenation to full spectrum alkenes with an ultra-high yield.

Spinel-like ZnFeO is tailor-made synthesized for catalyzing CO hydrogenation, achieving an ultra-high yield (1858.1 g kg h) of full spectrum alkenes in a three-stage reactor system. This study provides rational design concepts from catalyst to equipment amelioration by combining promoter regulation and ex situ water removal, efficiently catalyzing CO into valuable chemical feedstocks with industrial potential.

Facile Synthesis of Proton-Type ZSM-5 by Using Quasi-Solid-Phase (QSP) Method.

Herein, a simple and green quasi-solid-phase (QSP) method for facile synthesis of proton-type ZSM-5 avoiding use of excessive water, dry gel, Na cation and fluoride is reported. Crystallization by using the stoichiometric amount of TPAOH (tetrapropylammonium hydroxide) at 180 °C for only 12 h gave well-structured HZSM-5 crystals with high specific surface area of 429 m  g and high thermal stability. 5MRs was observed to closely relate the formation of MFI structure and QSP method exhibits shorter induction period (t ), higher nucleation rate (V ), and faster growth rate (V ).

Insight into molecular characteristics of a Chinese coal via separation, characterization, and data processing.

Dayan lignite was subjected to thermal dissolution sequentially with cyclohexane, acetone, and methanol. Each thermal dissolution extract was subjected to further separation/enrichment using column chromatography, which was sequentially eluted with petroleum ether, a mixture of ethyl acetate and petroleum ether (vol:vol = 1:1), and ethyl acetate. The three thermal dissolution extracts and nine enrichment subfractions were characterized by an Orbitrap mass spectrometry equipped with an atmospheric pressure chemical ionization ion source.

Hydroxides Ni(OH)&Ce(OH) as a novel hole storage layer for enhanced photocatalytic hydrogen evolution.

In this work, a novel photocatalyst Ni(OH)2&Ce(OH)3@P-CdS was synthesized successfully by phosphorization of CdS and in situ loading of Ni(OH)2&Ce(OH)3 on the surface of P-CdS. It was found that the introduction of the element P can expand the absorption range of light, prolong the lifetime of the photoinduced carriers of CdS and enhance photocatalytic hydrogen evolution activity. Importantly, we found that Ni(OH)2&Ce(OH)3 can play the role of storing holes, which can efficiently inhibit the recombination of photoinduced electron-hole pairs, thus enhancing hydrogen evolution activity, the hydrogen evolution activity of Ni(OH)2&Ce(OH)3@P-CdS is 11.

Strategies to control zeolite particle morphology.

Aluminosilicate zeolites with controllable morphology have attracted considerable attention due to their potential applications in catalysis, adsorption, and separation technologies, as well as the biomedical field. However, the rational design and preparation of zeolites with the required morphology have not been achieved because the zeolite crystallization mechanism has not been fully understood, and therefore, the nucleation and crystal growth processes cannot be oriented. This paper reviews the progresses achieved in zeolite morphology control.

Dictyoptesterols A-C, ∆-24-oxo cholestane-type sterols with potent PTP1B inhibitory activity from the brown alga Dictyopteris undulata Holmes.

Three new cholestane-type sterols bearing an unusual ∆-24-oxo side chain, namely, dictyoptesterols A-C (1-3), were isolated from the brown alga Dictyopteris undulata Holmes, together with five known strutural analogues (4-8). Their structures were elucidated on the basis of by extensive spectroscopic analysis. The absolute configurations of the steroidal nuclei of the new compounds were proposed by a comparison of NMR data with those of related known compounds as well as biogenetic considerations.

Human heart cell proteins interacting with a C-terminally truncated 2A protein of coxsackie B3 virus: identification by the yeast two-hybrid system.

Protein 2A is a non-structural protein of coxsackievirus B3 (CVB3), an important human pathogen that can cause a variety of human diseases. Protein 2A not only participates in viral life cycle, but also regulates host cell functions; however, the underlying mechanisms remain poorly understood. In order to better understand the molecular mechanisms of CVB3 2A's function, the yeast two-hybrid (Y2H) system was adopted to screen for CVB3 2A interactive proteins in the human heart cDNA library.