After adding a polyethylene glycol solution to the catalyst and carrying out the reaction, the resulting liquid turns yellow
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I have a question: Polyethylene glycol 200 solid is dissolved in water to form an aqueous solution, which is then added to the catalyst as a pore-expanding agent. Then we calcined the prepared solid catalyst in a muffle furnace, removed it after high-temperature heating, and used this catalyst to catalyze a liquid-phase reaction. It was found that the color of the liquid after the reaction turned yellow; originally, the product liquid obtained from the catalyst prepared without adding PEG 200 aqueous solution was colorless. May I ask: Did the PEG200 added undergo a decomposition reaction, producing a yellow-colored substance that caused the color of the product to darken after the catalytic reaction? What colored substances are formed when PEG-200 is calcined at a high temperature of 400 degrees? Those who know please give an explanation!
This post was last edited by Guderian on 2019-3-15 09:52. Perform thermogravimetry under aerobic and anaerobic conditions respectively. Another approach is to treat the catalyst for the same amount of time under the same temperature and pressure in a solvent system without any reactive starting materials, and check whether the solution changes color.
Has your polyethylene glycol not been completely decomposed?
PEG-2000, not PEG-200 – at what temperature does it generally decompose?
It takes over 500 degrees to decompose it completely