Scientists at Cardiff University have taken a step towards a greener and more sustainable way, creating a plastic material that is used in a range of items from toothbrushes and guitar strings to medical implants, building materials and car parts. This plastic material can be found.Science, the team reports an entirely new way to make cyclohexanone oxime — a precursor to the plastic material nylon 6, a key building material used in the automotive, aircraft, electronics, apparel and medical industries.
Global annual production of nylon 6 is estimated to reach around 9 million tons per year by 2024, prompting scientists to look for greener and more sustainable ways to produce cyclohexanone oxime.Currently, cyclohexanone oxime is produced industrially through a process involving hydrogen peroxide (H2O2), ammonia (NH3), and a catalyst called titanosilicate-1 (TS-1).The H2O2 used in this chemical process, and many others, is produced elsewhere and needs to be brought in before it can be used in chemical reactions.This is a costly and carbon-intensive process that also requires transporting high concentrations of H2O2 to the end user prior to dilution, which effectively wastes a lot of the energy used in the enrichment process.
Likewise, stabilizers typically used to extend the shelf life of H2O2 limit the useful life of the reactor and often need to be removed before reaching the final product, resulting in further economic and environmental costs.To address this issue, the team devised a method to in situ synthesize H2O2 from dilute hydrogen and oxygen streams using a catalyst consisting of gold-palladium (AuPd) nanoparticles loaded directly onto TS-1 or an auxiliary support.
Nanoparticles, measured between approximately 1 and 100 nanometers, are very useful materials for use as catalysts due to their large surface area to volume ratio compared to bulk materials.This method is perfectly formed under conditions previously considered extremely unfavorable for H2O2 production, and can produce yields comparable to cyclohexanone oxime seen in current commercial processes, while avoiding the major disadvantages associated with commercial H2O2.
In addition, the team was able to demonstrate the versatility of the approach, said lead author Dr Richard Lewis of the Cardiff Institute for Catalysis Institute’s Max Planck-Cardiff Centre for Fundamentals of Heterogeneous Catalysis: “This work represents This is a positive first step towards more sustainable selective chemical transformations and has the potential to replace the current industrial route for cyclohexanone oxime.” The H2O2 produced by this new method can be used for a wide range of other industrial applications currently Relying on the use of TS-1 and H2O2 may represent a sea change in hatred of industrial oxidation chemistry.”This clearly shows that through academic and industrial collaboration, significant improvements to current state-of-the-art technologies can be made, resulting in significant cost savings and reductions in greenhouse gas emissions from a major industrial process.”
Post time: Jun-06-2022