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Study on structural characteristics of pillared clay modified phosphate fertilizers and its increase efficiency mechanism

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2005年第3期6卷 195-201页

作者：吴平霄廖宗文 School of Envirnoment Science and Engineering South China University of Technology Guangzhou 510640 China School of Resource and Environment South China Agricultural University Guangzhou 510640 China

Three types of new high-efficiency phosphate fertilizers were made when pillared clays at certain proportions were added into ground phosphate rock. Chemical analyses showed that their soluble phosphorus content decreased more than that of superphosphate. Pot experiment showed that, under equal weights, the new fertilizers increased their efficiency by a large margin over that of superphosphate. Researches on their structures by means of XRD, IR and EPR spectrum revealed that their crystal structures changed considerably, improving their activity and preventing the fixation of available phosphorus in the soil, and consequently, greatly improved the bioavailability and became the main cause of the increase of biomass.

关键词： High-efficiency phosphate fertilizers Structures pillared clay Pot experiment

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Synthesis,Characterization and Catalysis of New pillared Anionic clays by[GaW_(11)O_(39)M(H_(2)O)]^(7-)(M=Mn^(2+),Co^(2+)or Ni^(2+))

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Chemical Research in Chinese Universities 1998年第3期14卷 32-36页

作者： Zhu, Zhi-ping Peng, Wan-pu Zhou, De-feng Liu, Jing-fu NE Normal Univ Dept Chem Changchun 130024 Peoples R China

pillared anionic clays or layered double hydroxides were prepared by means of hydrothermal ion exchange reaction of [Zn 2Al(OH) 6]NO 3· x H 2O (ZnAl NO 3) with [GaW 11 O 39 M(H 2O)] 7- (abbreviated as GaW 11 M, M=Mn 2+ , Co +2 or Ni 2+ ). The layered compounds were characterized by means of XRD, IR, elemental analysis and DTA. The X ray diffraction and IR spectra show that the new anionic clays synthesized are layered compounds with the gallery heights of 0.99-1.00 nm and the Keggin structure tungstogallic heteropolyanions almost completely replace the interlayer NO - 3, entering the layer and retain their Keggin structure. The DTA gives a thermostability order of ZnAl GaW 11 Ni >ZnAl GaW 11 Co>ZnAl GaW 11 Mn>ZnAl NO 3. The ctalytic tests showed that the new pillared compounds have higher catalytic activities in the cyclooxidation reaction of maleic acid.

关键词： Heteropolyanion Intercalation pillared clay Epoxidation

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Gallery-templated Synthesis of Titanium/Silicon-containing Mesoporous Montmorillonite-based Catalytic Materials

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Chinese Chemical Letters 2003年第12期14卷 1285-1288页

作者： Chun Hui ZHOU Zhong Hua GE Xiao Nian LI Hong Qiang GUO Jian SUN College of Chemical Engineering Zhejiang University Of TechnologyHangzhou 310014

A mesoporous titanium/silicon -containing montmorillonite-based catalytic materials has been synthesized by novel gallery-templated techniques. XRD, SEM, framework IR, and N2 adsorptiondesorption isotherms provided evidence of the formation of Si/Ti pillars. The synthetic materials show potential catalytic application for hydroxylation of phenol with peroxide.

关键词： Mesoporous materials montmorillonite pillared clay hydroxylation of phenol.

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