Abstract
Upon addition of gold to silicalite-1 pellets (a MFI-type zeolite), the vapor phase oxidation of ethanol could be addressed to acetaldehyde or acetic acid formation. By optimizing the catalyst composition and reaction conditions, the conversion of ethanol could be tuned to acetaldehyde with 97% selectivity at 71% conversion or to acetic acid with 78% selectivity at total conversion. Considering that unloaded silicalite-1 was found to catalyze the dehydration of ethanol to diethylether or ethene, a green approach for the integrated production of four important chemicals is herein presented. This is based on renewable ethanol as a reagent and a modular catalytic process.
Highlights
Ethanol (“bioethanol”) has emerged as a promising renewable feedstock available from carbohydrate biomass, providing alternative routes towards chemicals currently derived from fossil resources
Some researchers have found that even large gold particles can be Amazingly, acetic acid was obtained over a catalyst having gold present as large particles with a catalytically active, in our case the metal size is too polydispersed to conclude whether the marked wide size distribution
Some researchers have found that even large gold particles can be increase in acetic acid formation and the gain in activity are due to the contribution of these large catalytically active, in our case the metal size is too polydispersed to conclude whether the marked particles
Summary
Ethanol (“bioethanol”) has emerged as a promising renewable feedstock available from carbohydrate biomass, providing alternative routes towards chemicals currently derived from fossil resources. Ford was one of the first to apply vegetable fuels (in particular, ethanol) for transport and the production reached 18 million tons/year in the 1930s at plants in Kansas. Its potential to mitigate greenhouse gases (i.e., CO2 emissions) and replace fossil fuel-based oil represents the main reason why bioethanol is nowadays considered and implemented, but this is fully dependent on its production method. Bioethanol can be obtained by fermenting sugars contained in a wide range of biomass resources, each one differently effective at reducing carbon dioxide emissions and replacing fossil fuels. The most efficient way to achieve ethanol is via Brazilian sugar crops (namely, sugarcanes and beets).
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