By R. Archibald
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Extra resources for American Math. Soc. Semicentennial Pubs (Vol 1 of 2)
The increase of SiO,/Al,O, ratio leads to the reduction of acid sites concentration and, consequently, to a change in catalytic properties Zeolite Catalysis in the Conversion of Methanol into Olejns 45 of mordenite. Zeolites X and Y have faujasite-like structure. The typical composition of these zeolites can be expressed as gH,O, NapAlpSi,,,-pO,,, where p varies between 74 and 96 for X zeolite and from 48 to 74 for Y zeolite. The value of q is between 250 and 270. The faujasite framework is an array of truncated, octahedra linked by D6R prisms (Figure 9).
The lower acid strength of Fe-silicate, which was evidenced by NH,-TPD experiments, was held responsible for this. 4% butene). The conversion was not specified, but it was not complete. 8 C-mol%. 16, studied the catalytic properties of beryllium-silicates with a zeolite-type structure. Methanol conversion yielded primarily olefins, while on the isostructural aluminum-silicate catalyst paraffins and aromatics were obtained. The methanol conversion was considerably higher on the [Al]-ZSM-5 than on the [Be]-ZSM-5, except in one example (Table 12).
Judging from the product distribution, this must have been high. At 600 "C and complete conversion of methanol, a selectivity of 70 w t % C,-C, olefins was obtained. For moderate reaction conditions, Dehertog and Fromentlo4 also reported a significant increase in the maximum yield of light olefins on PHZSM-5 as compared with HZSM-5. At temperatures above 480 "C this effect was no longer observable. 6% on P-HZSM-5. VBdrine et a1 ,1 3 2 however , attained higher yields on the P-modified zeolites at higher temperature: at 480 "C the hydrocarbon fraction obtained on the P-ZSM-5 contained 71 w t % C,-C, olefins, whereas with HZSM-5 this was only 49 w t % at comparable methanol conversions (83% to 86%).