To clarify the Ni species of NiO/SiO2-Al2O3 catalysts that are active for ethylene oligomerization, 18 types were prepared using three Ni-loading methods (i.e., ion-exchange, impregnation, and homogeneous precipitation), with different Ni-loadings (1–20 wt%), examined respect to their structure catalytic activity oligomerization. Characterized by N2 adsorption, powder XRD, FE-SEM, H2-TPR, NH3-T...

Mikroporöse Materialien In der Zuschrift auf S. 17478 berichten Dan Zhao et al. über Tetrazol-funktionalisierte Zirconium-organische Käfige für effiziente C2H2/C2H4- und C2H2/CO2-Stofftrennungen.

Waste nitrous oxide (N2O) was utilized as an oxidant for ethane oxydehydrogenation reaction at the temperature range from 450 ◦C to 700 ◦C over the mesoporous Cr/Al2O3 catalyst synthesized via the one-pot evaporation-induced self-assembly (EISA) method. The catalyst was characterized by X-ray diffraction, transmission electron microscopy, and nitrogen adsorption-desorption analysis. The obtaine...

Biological Attributes of Ethylene: Colorless gas at biological temperatures. Naturally occurring organic compound. Readily diffuses from tissue. Produced from methionine via ACC by a highly regulated metabolic pathway. Key enzymes are ACC synthase and ACC oxidase. C2H4 synthesis is inhibited by C2H4 in vegetative and immature reproductive tissue. C2H4 synthesis is promoted (autocatalytic) by C2...

The electrocatalytic CO2 reduction technology is expected to simultaneously alleviate increasing emissions and the depletion of fossil resources. However, it still a big challenge improve selectivity toward valuable multi-carbon products in reaction. In this study, synergistic role Cu+ Cu0 species Cu2O-Cu interfaces unravelled through density functional theory (DFT) calculations, which electrod...

Reactions of neutral vanadium oxide clusters with small hydrocarbons, namely C2H6, C2H4, and C2H2, are investigated by experiment and density functional theory (DFT) calculations. Single photon ionization through extreme ultraviolet (EUV, 46.9 nm, 26.5 eV) and vacuum ultraviolet (VUV, 118 nm, 10.5 eV) lasers is used to detect neutral cluster distributions and reaction products. The most stable ...

By means of density functional theory computations, we demonstrated that C2H4 is the ideal terminal group for zigzag graphene nanoribbons (zGNRs) in terms of preserving the edge magnetism with experimental feasibility. The C2H4 terminated zGNRs (C2H4-zGNRs) with pure sp(2) coordinated edges can be stabilized at rather mild experimental conditions, and meanwhile reproduce the electronic and magn...

The objective of this study was to get more information about the root zone, mainly the gas composition in substrates, which are used in closed hydroponic systems. For analyses of carbon dioxide (CO2), ethylene (C2H4) and oxygen (O2) different methods were proved and used. For analyses of carbon dioxide and ethylene, a gas sampling system was used to get gas samples from the root zone. CO2 gas ...

Wu, M.J., Zacarias, L. and Reid. M.S., 1991. Variation in the senescence of carnation (Dianthus cao,ophyllus L.) cultivars. II. Comparison o f sensitivity to exogenous ethylene and of ethylene binding. Scientia Hortic., 48:109-116. Flowers o f the 'Sandra' and "Chinera" cultivars o f carnation (Dianthus caryophyllus L. ) last about twice as long ( 14 days) as those o f 'Whi te Sim' cultivar (7 ...

full factorial experimental design (23) for the evaluation of slurry ethylene polymerization in the presence of an industrial ticl4/mgcl2 ziegler-natta catalyst was employed. the following parameters were used as independentvariables: al/ti molar ratio, reaction temperature and hydrogen partial pressure. the total polymerization pressure was 9 bar. catalyst activity, mfi (melt flow index) and m...