Influence of feed contaminants in hydroxylation of benzene

N2O from adipic acid process as a waste by-product or synthesis via selective oxidation of ammonia is used a feedstock for single-step technology of benzene hydroxylation. Conversion of benzene in the presence of N-containing compounds, CO, O2, and H2O was studied. Phenol productivity and resistance to coke formation of zeolite catalyst were affected by contaminants in different ways. Some of them such as N-containing compounds were shown catalyst poison. CO was found in competition with N2O to reduce in active sites and H2O was presented negative effect on productivity. Complete Oxidation of benzene to CO2 and H2O was occurred in the presence of O2. As the result, phenol was formed with near 97% selectivity and average productivity of 5 mmol/gh while H2O and CO exert a promoting effect on prolong activity of the zeolite catalyst

کلیدواژه ها:

Benzene hydroxylation ، Contaminants ، Catalyst stability ، Fe/ZSM-5