Production of hydrogen

The purpose of the dissertation: Create low molecular weight, water-soluble chitosan with antifungal ability from chitosan by the degradation method by hydrogen peroxide agent to prevent effectly the anthracnose on post-harvest fruit and vegetables (mango, banana and chili pepper)

34p tunelove 11-06-2021 40 3   Download

Purpose: Using the density functional method (DFT) to find out the mechanism of CO2 hydrogenation reaction, the main product, by-products, the optimal reaction path, compare and evaluate the catalytic ability of the Ni5 cluster, Ni5/MgO, and Ni5/AC.

25p thebadguys 08-06-2021 12 3   Download

The paper will present background information on exergy theory; identify the core subsystems in an SMR plant coupled with storage systems in support of renewable energy and hydrogen production; perform a thermodynamic exergy analysis; determine the cost allocation among these subsystems; and calculate unit exergetic costs, unit exergoeconomic costs, and first and second law efficiencies.

10p christabelhuynh 30-05-2020 24 1   Download

Recovering useful hydrocarbons from sewage sludge using zirconia-supporting iron oxide catalysts was investigated. Zirconia has activity for decomposing water molecules to generate active oxygen and hydrogen species.

6p tuananhhumg 04-11-2013 37 2   Download

Human hepatitis delta (HDV) ribozyme is one of small ribozymes, such as hammerhead and hairpin ribozymes, etc. Its secondary structure shows pseudoknot structure com-posed of four stems (I to IV) and three single-stranded regions (SSrA, -B and -C). The 3D structure of 3¢-cleaved product of genomic HDV ribozyme provided extensive information about tertiary hydrogen bonding interactions between nucleotide bases, phosphate oxygens and 2¢OHs including new stem structure P1.1.

12p tumor12 22-04-2013 38 3   Download

The synthesis and involvement of H2O2 during the early stages of melano-genesis involving the oxidations of DOPA and dopamine (diphenolase activity) were established by two sensitive and specific electrochemical detection systems. Catalase-treated reaction mixtures showed diminished rates of H2O2 production during the autoxidation and tyrosinase-mediated oxidation of both diphenols.

0p awards 06-04-2013 32 3   Download

Cytochrome P450 enzymes promote a number of oxidative biotransformations including the hydroxylation of unacti-vated hydrocarbons.

26p awards 05-04-2013 44 7   Download

Hydrogen sulfide is a potent toxin of aerobic respiration, but also has physiological functions as a signalling molecule and as a substrate for ATP production. A mitochondrial pathway catalyzing sulfide oxidation to thio-sulfate in three consecutive reactions has been identified in rat liver as well as in the body-wall tissue of the lugworm,Arenicola marina.

10p galaxyss3 07-03-2013 34 4   Download

The production of H2O2 by isolated mitochondria is frequently used as a measure of mitochondrial superoxide formation. Matrix superoxide dismu-tase quantitatively converts matrix superoxide to H2O2. However, matrix enzymes such as the glutathione peroxidases can consume H2O2 and com-pete with efflux of H2O2 , causing an underestimation of superoxide produc-tion.

13p mobifone23 21-01-2013 42 3   Download

BASICS OF CRUDE OIL Crude oils are complex mixtures containing many different hydrocarbon compounds. An average crude oil contains about 84% carbon, 14% hydrogen, 1 ÷ 3% sulfur and less than 1% each of nitrogen, oxygen, metals and salts. Simple crude oil assays are used to classify crude oils as paraffinic, naphthenic, aromatic or mixed, based on the predominant proportion of similar hydrocarbon molecules. The comprehensive crude assays determine the value of the crude: its yield and quality of useful products.

5p vitconsieuquay 19-08-2011 251 141   Download

Abstract A new method is presented for improving the performance of red mud as a hydrogenation catalyst (a residue from the production of alumina by the Bayer process that contains iron oxides), based on the method developed by K.C. Pratt and V. Christoverson, Fuel 61 (1982) 460. The activation method consists essentially in dissolving red mud in a mixture of aqueous hydrochloric and phosphoric acids, boiling the resulting solution, adding aqueous ammonia until pHˆ8, and ®ltering, washing, drying and calcining the resulting precipitate. ...

11p tudoia 06-04-2011 67 5   Download

Abstract Red mud is a residue in the production of alumina by the Bayer process. It contains oxides of iron and titanium, and has been shown to be active in sulfided form as hydrogenation catalyst. The evolution of sulfided red mud activity and selectivity with reaction time was studied for the hydrogenation of a light fraction of an anthracene oil.

15p tudoia 06-04-2011 93 11   Download

Catalytic oxidation of organic compounds is an extremely important field of chemistry, spanning the range from biological oxidations to large scale industrial production of commodity chemicals. However, many of these transformations can hardly be classified as organometallic reactions, since the catalysts (often simple metal salts) and the intermediates can be rather regarded as coordination complexes than organometallic compounds.

7p boyminsk 10-06-2010 103 18   Download