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- W1982573967 abstract "Acidic properties of NaHZSM-22 zeolites of various exchange degrees were studied by infrared and N1s X-ray photoelectron spectra of chemisorbed pyridine. Two kinds of Brönsted and one type of Lewis sites were detected in fully protonated ZSM-22 zeolite. The concentration of these two kinds of Brönsted acid sites and of Lewis acid sites were determined as a function of sodium content. For fully protonated ZSM-22 zeolite, it has been found that among the total acid sites about 30% are stronger Brönsted acid sites. Introduction of sodium ions into zeolites poisoned both weak and strong Brönsted acid sites simultaneously. Comparison of N1s XPS data with i.r. results allowed us to conclude that at an early stage of sodium poisoning surface Brönsted sites are poisoned preferentially to those in the bulk and that the relative rate of poisoning was higher for stronger Brönsted acid sites than for weak Brönsted acid sites." @default.
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- W1982573967 date "1992-01-01" @default.
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- W1982573967 title "The effect of sodium poisoning on acid sites in ZSM-22 zeolites" @default.
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- W1982573967 doi "https://doi.org/10.1016/0144-2449(92)90014-g" @default.
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