Solid acid catalyst

Ebook "Characterization and design of zeolite catalysts: Solid acidity, shape selectivity and loading properties" provide us the strong acidity with the fine distribution which enables various useful catalytic reactions. When some metals and cations are loaded in close to the acid sites, these loaded elements show extraordinary characters, and many catalytic reactions proceed thereon. Microporosity provides us a unique property of the shape selectivity, and the excellent selectivity is observed.

189p manmanthanhla0201 26-02-2024 1 1   Download

The isomerization of α-pinene – a renewable bioresource – was investigated as a relatively simple method for the syntheses of camphene and limonene, industrially important products. The catalytic activity of H2SO4-modified clinoptilolite was evaluated without any solvent and the results show its applicability as a novel, green, reusable and promising catalyst in organic syntheses.

14p vironald 15-12-2022 7 2   Download

This article has reviewed the progress that has been made in bioleaching research of metals using filamentous fungi. This review has focused on fungal bioleaching from various metal sources, including mine tailings, electronic waste, solid mine wastes, spent catalysts, and low-grade ores. Filamentous fungi are used in bioleaching due to their ability to secrete organic acids and facilitate the solubilization of metal ions from the solution phase.

15p thebadguys 15-01-2022 9 0   Download

A novel melamine–formaldehyde resin (MFR) supported solid acid with Lewis and Brønsted acid sites was synthesized through the immobilization of acidic ionic liquid and cuprous ion on MFR. The scanning electron microscopy (SEM) characterization showed that addition of PEG-2000 in the synthesis of MFR could promote the formation of regular particles with diameters around 3.7 µm. The XRD pattern demonstrated that some cuprous ions were aggregated.

7p langthannam 29-12-2021 7 0   Download

Biodiesel, fatty acid methyl ester produced by the transesterification of vegetable oil with methanol, is a promising alternative to petroleum-based diesel fuel. In the present study, the methanolysis of high free fatty acid (FFA) Jatropha curcas oil in a transesterification reaction using K2CO3/CaO solid base catalyst was studied. The various reaction parameters in the transesterification reaction were also discussed.

17p tudichquannguyet 29-11-2021 7 1   Download

A one-pot, environmentally friendly, and efficient protocol for the synthesis of novel polyfunctionalized benzo[a]pyrimido[5’,4’:5,6]pyrido[2,3-c ]phenazine derivatives has been reported by a one-pot, four-component sequential reaction between 2-hydroxynaphthalene-1,4-dione, benzene-1,2-diamines, benzaldehydes, and 6-amino-1,3-dimethyluracil in the presence of p-TSA as a nontoxic, inexpensive, ecofriendly, and efficacious solid acid catalyst. Two C-C bonds, two C=N bonds, and one C-N bond, as well as two new rings, were formed in this reaction.

10p tudichquannguyet 29-11-2021 19 1   Download

Potentially active and eco-friendly solid acid catalysts have been synthesized by loading different weight percentages (10, 15, and 50) of nickel oxide on thermally activated Turkish perlite through the deposition-precipitation method. Structural features of prepared catalysts were analyzed using BET surface area analysis, X-ray diffraction, scanning electron microscope (SEM), SEM-EDX, transmission electron microscopy (TEM), Fourier-transform infrared (FT-IR), pyridine adsorbed FT-IR, UV-Vis diffuse reflectance spectroscopy (DRS), and thermogravimetric analysis (TGA) techniques.

18p tudichquannguyet 29-11-2021 9 0   Download

The results showed that the active component Zr(SO4 )2 was successfully adhered to the mesoporous SiO2 , and the acid amount of Zr(SO4)2/SiO2 increased with the increasing of the Zr(SO4)2 loadings. Finally, the wheat stalk was used as raw material and depolymerized over Zr(SO4)2/SiO2 to produce ethyl levulinate (EL). The reaction mixture was separated and purified by filtration and vacuum distillation. The kinetic characteristics and the reaction pathway were also studied. A comparative study showed that 20 wt.% Zr(SO4)2/SiO2 exhibited higher catalytic activity.

13p tudichquannguyet 29-11-2021 8 1   Download

Sevelamer (polyallyamine resin)-supported sulfonic acid (S-SO3H) has been prepared from the reaction of sevelamer with chlorosulfonic acid and characterized using FT-IR spectroscopy, scanning electronmicroscopy (SEM) and ther‑ mogravimetric analysis (TGA).

7p vijiraiya2711 27-05-2020 11 1   Download

Iron is an essential micro-mineral in human nutrition. It is a mineral found in every cell of the body and required to make part of blood cell. It participates as a catalyst in several metabolic reactions. As a component of haemoglobin, myoglobin, cytochrome and other proteins, iron plays an important role in the transport, storage and utilization of oxygen and cellular proliferation. In this study, an attempt was made to prepare dahi by using 1% starter culture, fortified with iron by using ferrous lactate @ 40 mg/kg milk.

6p chauchaungayxua5 05-05-2020 12 2   Download

In this study, we successfully synthesized Zn-Sn and Al-Sn catalysts by the combination of co-precipitation and hydrothermal methods. These catalysts were prepared by hydrothermal method using ZnCl2, SnCl4 and AlCl3 precursors. Structure and physical properties of catalysts were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). The products of glycerol conversion product was also tested by gas chromatography.

9p abcxyz123_02 18-03-2020 11 1   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

The main purpose of this study was to find out optimal conditions for producing biodiesel via esterification of palmitic acid in excess methanol using solid acid catalyst, viz. Amberlite™ IR-120 (H) resin. A stepwise regression for Box-Behnken design was performed to optimize parameters of this process. A 93.94 % of conversion efficiencies could be explained by an insignificant lack-of-fit response surface model (R 2 = 0.9394; p = 0.259). Optimum conditions were found as follows: 8:1 in the molar feed ratio of methanol to palmitic acid, a reaction temperature as 61.

8p ketaucho 20-11-2019 24 0   Download

In this study, a carbon–based solid acid catalyst was prepared via hydrothermal carbonization method (HTC) using glucose and pyrolysed waste tyre as carbon precursors and aqueous solution of H2SO4 as sulfonation agent. Prepared catalysts were characterized by X–ray diffraction (XRD), scanning electron microscope (SEM), Fourier transform infrared FT–IR and Brunauer–Emmett–Teller (BET). As the result, catalysts were manufactured with the appropriate physical and chemical characteristics and high acidity.

7p cumeo3000 01-08-2018 26 0   Download

Two FCC catalysts with a 60
m average size, prepared with different crystallite sizes (0.4 and 0.9
m), are studied in terms of total acidity, energy of ammonia desorption, specific surface area, relative amount of Brönsted and Lewis acid sites, crystallite and particle size, and micropore size distribution.

17p tuananhhumg 04-11-2013 59 5   Download

Reactive liquid-liquid extraction of inorganic acids with amines and effect of solvating diluents; Liquid extraction of tall oil from wastewaters of paper industry • Supercritical fluid extraction of natural products; Enzymatic reactions in supercritical CO2; Solubilities of liquids and solids in dense CO2 with entrainer • Relation between the morphology and application properties of polymer catalysts and adsorbents • Study of the permeation and pervaporation of volatile organic substance (propan-1-ol, toluene) • Observation of the competitive adsorption on Vycor glass membrane App...

66p lulanphuong 22-03-2012 83 12   Download