However, if the zeolite is washed with phosphoric acid and heated strongly, minute particles of phosphorus(V) oxide are deposited on the surface making the pores slightly smaller. This restricts the diffusion of the 1,2- and 1,3-isomers and they are held in the pores until they are converted into the 1,4-isomer and can escape (Figure 9).
This remarkable selectivity enables the yield of the 1,4-isomer to be increased from 25% to 97%.
However, if the zeolite is washed with phosphoric acid and heated strongly, minute particles of phosphorus(V) oxide are deposited on the surface making the pores slightly smaller. This restricts the diffusion of the 1,2- and 1,3-isomers and they are held in the pores until they are converted into the 1,4-isomer and can escape (Figure 9).This remarkable selectivity enables the yield of the 1,4-isomer to be increased from 25% to 97%.
การแปล กรุณารอสักครู่..
