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How can I dissolve chromia catalyst in lab? 

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The chromia-based catalysts tested here have proved to be quite active but they also lose some chromium from the catalyst, by attack of the nascent Cl2, having thus a short life when the Cl-content in the flue gas is relatively high.
Reduction of Cr species seems rather easy for chromia–zirconia and K-containing chromia–zirconia samples with K contents up to 0.5 wt.%.
Chromia is identified as highly efficient co-catalyst in the presence of CuOx : it is essential for the oxidation of water.
The results reveal that the PECVD method is a solvent free one step method suitable for preparation of chromia containing catalysts.
Unsupported chromia is more active and less selective (at comparable conversions) than the chromium oxide-alumina catalysts.
The results show that chromium evaporation is a key process affecting the oxidation resistance of chromia formers and marginal chromia formers in O2/H2O mixtures.
A study of the catalytic decomposition of H2O2 on chromia shows that the early stages of the reaction are heterogeneous.
The activity of the chromia catalyst compared to alumina might be due to the supply of basic oxygen which can attack the double bond.

Related Questions

Chromium good or bad?3 answersChromium has both beneficial and harmful effects on human health. Trivalent chromium, found in proper quantities, can be quite beneficial. It plays a vital role in balancing glucose, triglyceride, and cholesterol levels in the body. On the other hand, hexavalent chromium is harmful and can cause cancer. Excessive intake of chromium is also harmful, and overexposure to chromium can lead to carcinogenic effects. It is important to consume chromium in adequate amounts, as an insufficient amount may not be beneficial. Overall, trivalent chromium is beneficial, while hexavalent chromium is harmful to human health.
Chromium in protein shake good or bad?3 answersChromium in protein shakes can have both positive and negative effects. On one hand, the use of whey protein fibrils (WPF) and activated carbon (AC) in hybrid membranes has shown promising results in removing heavy metals like chromium from water. Additionally, a study found that chromium complexation with proteins can be quantitatively determined using stripping voltammetry, indicating a potential benefit of chromium-protein interactions. On the other hand, excessive chromium intake can have detrimental effects, especially in diabetic individuals. A study conducted on diabetic rats showed that high protein intake combined with chromium supplementation resulted in improved nutritional and biological status, but also led to a decrease in albumin/globulin ratio. Therefore, while chromium-protein interactions can be beneficial in certain contexts, it is important to consider the overall chromium intake and individual health conditions when consuming protein shakes.
Removal of Chromium from water using based MOFs?5 answersMetal-organic frameworks (MOFs) have been extensively studied for the removal of chromium from water. Various types of MOFs, such as copper-based nanoparticles, zirconium-ferrocene MOFs, bimetallic MOFs, and polyethylenimine (PEI) polymer-based adsorbents, have shown promising results in chromium removal. These materials exhibit high adsorption capacities and selectivity for chromium ions. The synthesis and characterization of these MOFs have been carried out using techniques such as X-ray diffraction, scanning electron microscopy, and Fourier-transform infrared spectroscopy. The adsorption mechanisms of these MOFs involve both chemical reactions and physical adsorption. The adsorption isotherms and kinetics have been studied using models such as Langmuir, Freundlich, and pseudo-second order. The efficiency of these MOFs has been demonstrated in the removal of chromium from simulated drinking water, tap water, sea water, and wastewater. Overall, MOFs offer a promising solution for the removal of chromium from water due to their high adsorption capacity and selectivity.
How to dissolve of insoluble dyes?5 answersInsoluble dyes can be dissolved using various methods. One approach is to use mixed solutions of anionic polyelectrolyte and a cationic surfactant. Another method involves contacting an aqueous solution of the dye with an organic solvent containing an anionic emulsifier, and then separating the phases. Additionally, specific long-chain alkylamine salts with higher fatty acids can be used as solubilizing agents in hydrocarbon solvents. Solid formulations of insoluble dyes can also be prepared using dialkyl sulfosuccinates or C3-C6alkylnaphthalenesulfonates, along with anionic dispersants and other auxiliaries. These formulations exhibit good wettability, dispersibility, and redispersibility, making them suitable for dyeing and printing natural and synthetic fibers.
How to dissolve oleic acid?5 answersOleic acid can be dissolved using various methods. One method involves dissolving industrial oleic acid in an organic solvent to obtain a mixed solution, which is then stirred under low temperatures until solid completely separates out. The liquid concentrate is collected to obtain crude oleic acid. Another method involves dissolving a mixed aliphatic acid, which includes oleic acid, in an organic solvent to obtain a mixed solution, which is then stirred at low temperatures until complete precipitate of a solid product is realized. The obtained liquid is collected and concentrated. Additionally, oleic acid can be dissolved by forming the ethyl ester of oleic acid through a reaction with ethyl alcohol, followed by dissolving the ester in a cooled ethanol solution. Furthermore, oleic acid can be obtained by hydrolyzing beef tallow, dehydrating and distilling the hydrophobic fraction, and then distilling the unsaturated fatty acid.
What is the chemical formula of chromic acid?5 answersChromic acid is not mentioned in any of the provided abstracts.

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