The catalytic activity of trimethyl phosphite modified HZSM-5 zeolite and un-modified HZSM-5zeolite treated with 100% steam at 673,773,873,973 and 1073K, respec
A method for determinaiton of sulfur content at ppb leve in light oils is proposed .The key technique of the method inluces the design of a new of pyrolysis tub