NDLI: Effect of the type of silicon source on the physicochemical and catalytic properties of mesoporous silicoaluminophosphate molecular sieves

Content Provider	Springer Nature Link
Author	Echevsky, G. V. Weixing, Qi Toktarev, A. V. Wei, W.
Copyright Year	2016
Abstract	Silicoaluminophosphates with the ATO structure have been synthesized using two types of silicon source (metakaolin and silica sol). To determine the composition, morphology, and acid properties, SAPO-31 samples have been characterized by various methods. It has been found that the samples synthesized using different silica sources have very different properties. Samples of SAPO-31 synthesized with metakaolin have a higher acidity and are more active in the catalytic hydroisomerization of n-decane as compared with their counterparts prepared with silica sol. The difference in the effect of the type of silicon source has been explained by morphological features of silica particles formed during the dissolution of silicon source (spherical particles of a ~10 nm size in the case of silica sol and nanoplates of a ~1 nm size in the case of metakaolin). On the basis of data on the enhancement of acidic properties in the SAPO-31 samples with an increase in silicon concentration therein, it has been doubted that the SM3 mechanism of incorporation of Si atoms into the aluminophosphate ATO framework really operates (in any of its form). It has been shown that the SM2 mechanism alone operates instead, involving the independent formation of regions with an aluminosilicate composition.
Starting Page	244
Ending Page	252
Page Count	9
File Format	PDF
ISSN	09655441
Journal	Petroleum Chemistry
Volume Number	56
Issue Number	3
e-ISSN	15556239
Language	English
Publisher	Pleiades Publishing
Publisher Date	2016-05-22
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	silicoaluminophosphates SAPO-31 mechanism of incorporation of isomorphically substituting elements Industrial Chemistry/Chemical Engineering
Content Type	Text
Resource Type	Article
Subject	Chemistry Geochemistry and Petrology Fuel Technology Chemical Engineering Energy Engineering and Power Technology

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