%I Springer
%X Phosphorus modification of ZSM-5 leads to extra framework ps+ and probably incorporation of +3 valence state of P in the framework. The resulting system has increased Bronsted
acidity. Theoretical calculations also favour the postulate that phosphorus in +3 valence state can be incorporated into the lattice
%A Viswanathan B
%A Alex Pulikottil C
%D 1993
%J Catalysis Letters
%P 373-379
%L catalysis99
%V 22 
%T Surface properties of ZSM-5 modified by phosphorus