Abstract
Propylene oxide (PO) is a versatile chemical, mainly used in the synthesis of polyurethane plastics. Propylene epoxidation using molecular oxygen could replace the tedious current synthesis protoco...
Highlights
INTRODUCTIONPropene (C3H6), commonly referred to as propylene (as it will be referred to in this work), is produced during oil refining as a result of cracking of larger hydrocarbons
Propene (C3H6), commonly referred to as propylene, is produced during oil refining as a result of cracking of larger hydrocarbons
The reaction was run with molecular oxygen at atmospheric pressure, and the maximum Propylene oxide (PO) selectivity was achieved at 210 °C
Summary
Propene (C3H6), commonly referred to as propylene (as it will be referred to in this work), is produced during oil refining as a result of cracking of larger hydrocarbons. Propylene oxide (PO) is a colorless volatile liquid with a high commercial value ($10.5 billion market value in 2017).5 It is a raw material in the manufacturing of polyurethane foams (furniture and automobile seating, insulation foams, and food packaging). Oxidation by abundant and cheap oxygen is highly preferred, but a suitable catalytic process that can selectively epoxidize propylene is still unknown. The main (and dominant) competitive reaction is allylic hydrogen stripping (AHS), which is a dehydrogenation reaction involving nucleophilic oxygen species and produces acrolein This means that the electrophilic/nucleophilic character of the oxidizing species is crucial to govern the reaction selectivity. This review covers original scientific papers as well as patent literature and will focus on experimental, DFT, and engineering approaches aimed at improving PO selectivity over silverand copper-based catalysts
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