Syntheses, structure solutions, and catalytic performance of two novel layered silicates

Two novel layered silicates, PKU-13 and PKU-13a, were hydrothermally synthesized by using trimethyl-propylammonium hydroxide as the structure directing agent (SDA). Their structures were solved by using powder X-ray diffraction data in combination with electron diffraction technique and NMR spectroscopy. These two silicates are built from the same r52 layer in different stacking modes: the adjacent r52 layers in PKU-13a have a 0.5b + 0.68c shift compared with those in PKU-13. The difference is due to the SDA cations located between the layers. The SDA cations exist as a monolayer in the structure of PKU-13, and link the adjacent layers by Coulomb actions in combination with strong hydrogen bonds. In PKU-13a, the SDA cations present in the bi-layer expend the distance between layers and destroy the inter-layer hydrogen bonds. PKU-13a can transform to PKU-13 after treatment with acetic acid solution. The co-existence of intra-layer hydrogen bonds in PKU-13 interfere in its condensation to an ordered crystalline microporous framework. Both PKU-13 and PKU-13a exhibit good catalytic activities as base catalysts in the Knoevenagel condensation reaction.

Su, JieStockholms universitet,Institutionen för material- och miljökemi (MMK)(Swepub:su)jsu (author)
Chen, Yanping (author)
Li, Zhaofei (author)
Li, Kuo (author)
Zhang, Hao (author)
Zou, XiaodongStockholms universitet,Institutionen för material- och miljökemi (MMK)(Swepub:su)xzou (author)
Liao, Fuhui (author)
Wang, Yingxia (author)
Lin, Jianhua (author)
Stockholms universitetInstitutionen för material- och miljökemi (MMK) (creator_code:org_t)

In:Dalton Transactions: Royal Society of Chemistry (RSC)44:35, s. 15567-155751477-92261477-9234

By the author/editor: Liang, Jie; Su, Jie; Chen, Yanping; Li, Zhaofei; Li, Kuo; Zhang, Hao; show more...; Zou, Xiaodong; Liao, Fuhui; Wang, Yingxia; Lin, Jianhua; show less...

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