3Franz J E, Crestwood. Process for producing N- phosphonomethylglycine[ P]. US :3 954 848,1976 - 05 - 04.
4Chou S K, Chesterfield. Process for removing surface oxides from activated carbon catalyst[ P]. US :4 624 937,1986 - 11 -25.
5Chou S K,Chesterfield. Amine oxidation using carbon catalyst having oxides removed from surface[ P]. US :4 696 772,1987 -09 - 29.
6Farmer R W,Vaughn R H. Method for the manufacture of N- phosphonomethyl-glycine from N-phosphonomethyliminodiacetic acid using a low temperature catalyst carbon [ P ]. US : 594 243, 1999 - 08 - 24.
7Nakano K, Sayama S, Hirayama Y ,et al. Process for producing N- phosphonomethylglycine[ P]. US :5 948 938,1999 - 09 - 07.
8Franz J E, Crestwood. Process for producing N- phosphonomethylglycine [ P ]. US : 3 950 402,1976 - 04 - 13.
9Felthouse T R, Louis St. Oxidation with encapsulated cocatalyst [P]. US:4 582 650,1986-04-15.
10Leiber M A,Ebner J R,Wan K T,et al. Use of a supplemental promoter in conjunction with a carbon-supported, noble -metal containing catalyst in liquid phase oxidation reactions [ P ]. US6 586 621,2003 -07 -01.
