Temperature and catalyst concentration

In this paper, we discuss the efficiency of using a Fe2V4O13 catalyst in a heterogeneous Fenton-like process for the degradation and mineralization of Ind. We examined various factors that influence the reaction, such as the initial pH of the reaction mixture, the initial concentration of hydrogen peroxide, the amount of the Fe2V4O13 catalyst, and the reaction temperature was investigated.

9p vijeff 30-11-2023 5 2   Download

The activity of n-hexane isomerization with 0,8 %kl Pd/HZSM-5 was studied in a micro reactor in the temperature range of 225-325oC at 0,1 Mpa with the molar ratio H2/ hydrocarbon of 5.92, n-hexane concentration of 9.2 %mol, GHSV 2698 h-1 at atmospheric pressure.

5p vichristinelagarde 04-07-2022 7 1   Download

At present, the methanol electrooxidation reaction (MOR) activities of carbon supported bimetallic Pt-Ru (M-PtRu@C) catalyst and monometallic Pt (M-Pt@C) catalysts prepared via microwave assisted polyol method and carbon supported Pt-Ru (P-PtRu@C) catalysts prepared by conventional polyol were examined to investigate the effect of the preparation method. These catalysts were characterized by X-ray diffraction, X-ray photo electron spectroscopy, and transmission electron microscopy (TEM).

13p langthannam 29-12-2021 11 0   Download

In this study, the synthesis of a novel 1,2-dinaphthyl ethanediol substituted phthalonitrile (2) together with tetra-substituted zinc(II) phthalocyanine (Pc) (3) and cobalt(II) Pc (4) bearing 1,2-dinaphthyl ethanediol at peripheral positions was described. The aggregation behaviors of metallophthalocyanines 3 and 4 in solution were investigated by carrying out Beer–Lambert experiments at different concentrations. In addition, the catalytic activity of new cobalt(II) Pc 4 was investigated for benzyl alcohol oxidation.

35p tudichquannguyet 29-11-2021 7 1   Download

Spectrophotometric monitoring of 4-nitrophenol (4-NP) reduction by sodium borohydride (NaBH4 ) using gold nanoparticles (GNPs) as a catalyst has been extensively studied, but the stability of GNPs in terms of change in the surface plasmon resonance (SPR) at different temperatures has not been explored. In the present investigation, our aim was to evaluate the SPR stability of GNPs as a catalyst during the reduction of 4-NP at different elevated temperatures (i.e. 30–60 °C) and sodium borohydride concentrations.

10p tudichquannguyet 29-11-2021 10 1   Download

In this work, the kinetics rates have been measured by optical microscopy using a single particle approach. The advantages of this analytical technique are an easier management of species transport in solution and a precise following of the dissolution rate.

12p christabelhuynh 30-05-2020 6 2   Download

Consumption of excessive big quantity of trance-isomers leads to organism dysfunction at cellular level. It is established that trance-isomers metabolized in an organism much more slowly than natural cis-isomers. The work is aimed at research of technologies of reception of firm fats with the minimum maintenance of trance isomerized fat acids. At hydrogenation of vegetable oils there are various collateral reactions, including trance isomerization during which natural cis-isomers of fat acids turn to trance-isomers.

5p quenchua2 15-12-2019 12 1   Download

This research illustrates the results of a study on the synthesis of maleic anhydride-vinyl acetate copolymers (MAVA) with the monomer molar ratio of 1:1 by the radical polymerisation method in which benzoyl peroxide was used as a catalyst. The structure and composition of MAVA were characterised by FTIR, 1 H-NMR and 13C-NMR spectra. The molecular weight of the copolymers was determined by the viscosity method. The copolymers were then modified by the esterification reaction with hexadecanol - a long alkyl chain alcohol.

6p caygaocaolon1 13-11-2019 33 1   Download

This paper investigates the eff ects of Ru/MCM-41 catalysts in the pyrolysis of waste tire using a semi-batch reactor. The pure silica support MCM-41 was synthesised via silatrane route. Prior to evaluating the activity of Ru/MCM-41 catalysts, the infl uences of MCM-41 and catalytic temperature were studied. The results indicated a strong impact of MCM-41 and catalytic temperature on the yield and nature of pyrolysis products. Oil yield fi rst decreased then increased with catalytic temperature.

10p quenchua 27-09-2019 29 0   Download

The degradation of aqueous diazinon from an aqueous solution using H2O2/Fe2+ process is performed in a 1L batch chemical reactor. The extent of diazinon degradation (20 mg/L) has been investigated from a known initial pH solution, temperature and catalyst type (Fe2+, Fe3+) and for various initial concentrations of diazinon, H2O2 and Fe2+.

12p vicross2711 20-06-2019 13 0   Download

Acetic acid or formic acid treatment of rice straw with the variation of reaction variables, namely acid concentration, catalyst (HCl or H2SO4) concentration, reaction time, temperature and liquor ratio, was investigated to ascertain effects on the dissolution of hemicellulose, which facilitates the dissolution of lignin during alkaline extraction or peroxyacid treatment and improved the drainability of straw pulp.

9p aquaman27 15-01-2019 25 1   Download

Kinetics is the study of how fast chemical reactions occur. There are 4 important factors which affect rates of reactions: Reactant concentration, temperature, action of catalysts, and surface area. Invite you to consult.

60p leminhuy 01-11-2015 49 4   Download