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Nb-containing aluminium phosphate molecular sieve composition and its preparation and application

A technology of phosphorus-aluminum molecular sieve and composition, applied in the direction of phosphorus compound, molecular sieve catalyst, molecular sieve characteristic aluminum phosphate, etc., to achieve the effect of high crystallinity and good performance

Inactive Publication Date: 2008-03-26
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] AlPO has not been seen so far 4 Crystal Structure of -5 Aluminum Phosphorus Molecular Sieves, Report on Molecular Sieves Using Niobium Substituting Partial Phosphorous Aluminum as Framework Elements of Tetrahedral Oxide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The synthesis method provided by the present invention is used to synthesize the niobium phosphorus aluminum molecular sieve, which is denoted as C-1.

[0034] According to Al 2 o 3 : 0.660P 2 o 5 : 0.152Nb 2 o 5 : 0.802TPPA: 4.705ETHA: 0.121OXAA: 46.507H 2 O raw material molar ratio, weigh 20 grams of alumina monohydrate, and corresponding amount of phosphoric acid (H 3 PO 4 , 85Wt%), niobic acid, oxalic acid (OXAA), deionized water, ethanol (ETHA), tri-n-propylamine (TPPA), prepare a mixed solution, stir it evenly and place it in a crystallization reactor, crystallize at 150 ° C for 3 days; then filtered, washed, dried, and roasted at 550°C for 5 hours to obtain anhydrous chemical composition (Nb 0.084 al 0.552 P 0.364 )O 2 The niobium phosphorus aluminum molecular sieve, its X-ray powder diffraction test obtained the data listed in Table 1, and its spectrum features basically consistent with Table A.

[0035] Table 1

[0036] 2θ

Embodiment 2

[0038] Using the synthesis method provided by the present invention, a magnesium-niobium-phosphorus-aluminum molecular sieve containing magnesium-substituting elements is synthesized, which is denoted as C-2.

[0039] According to Al 2 o 3 : 0.541P 2 o 5 : 0.038Nb 2 o 5 : 0.227MgO: 0.758TPPA: 2.353ETHA: 0.061OXAA: 27.482H 2 O raw material molar ratio, weigh 40 grams of alumina monohydrate, and corresponding amount of phosphoric acid (H 3 PO 4 , 85Wt%), niobic acid, magnesium acetate, oxalic acid (OXAA), deionized water, ethanol (ETHA), tri-n-propylamine (TPPA), prepare a mixed solution, stir it evenly and place it in a crystallization reaction kettle at 150 ° C Crystallized for 3 days; then filtered, washed, dried, and roasted at 550°C for 5 hours to obtain anhydrous chemical composition (Mg 0.067 Nb 0.022 al 0.591 P 0.320 )O 2 The magnesium-niobium-phosphorus-aluminum molecular sieve substituted by magnesium isomorphism, the X-ray powder diffraction test obtained ...

Embodiment 3

[0043] The boron-niobium-phosphorus-aluminum molecular sieve containing boron substituting elements is synthesized by adopting the synthesis method provided by the present invention, which is denoted as C-3.

[0044] According to Al 2 o 3 : 0.432P 2 o 5 : 0.038Nb 2 o 5 : 0.191B 2 o 3 : 0.756TPPA: 2.352ETHA: 0.304OXAA: 25.368H 2 O raw material molar ratio, weigh 40 grams of alumina monohydrate, and corresponding amount of phosphoric acid (H 3 PO 4 , 85Wt%), niobic acid, boric acid, oxalic acid (OXAA), ionized water, ethanol (ETHA) and tri-n-propylamine (TPPA), prepare a mixed solution, stir it evenly, place it in a crystallization reaction kettle, and crystallize at 150°C 3 days; then filter, wash, dry, and bake at 550°C for 5 hours to obtain anhydrous chemical composition of (B 0.115 Nb 0.023 al 0.602 P 0.260 )O 2 The boron-niobium-phosphorus-aluminum molecular sieve substituted with boron isomorphism, its X-ray powder diffraction test obtained the data listed in...

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Abstract

The present invention provides one kind of Nb-containing aluminum phosphate molecular sieve composition in the AlPO4-5 crystal structure and its preparation process and application. The molecular sieve composition in the AlPO4-5 crystal structure has substituting element Nb or Nb mixture in the tetrahedronal oxide skeleton structure. The Nb-containing aluminum phosphate molecular sieve composition of the present invention has high crystallinity and high catalytic performance.

Description

(1) Technical field [0001] The present invention relates to a kind of phosphorus aluminum molecular sieve composition containing niobium, especially a kind of 4 -5 Niobium-containing phosphorus-aluminum molecular sieve composition with crystal structure and its preparation and application. (2) Background technology [0002] USP4310440 first discloses aluminum phosphate molecular sieve (AlPO 4 -5) Structure and preparation method. For the first time, this new type of molecular sieve does not appear silicon-aluminum tetrahedron in the molecular sieve framework structure, but is composed of AlO 2 and PO 2 Composed of tetrahedrons, the molecular sieve framework is electrically neutral and has no exchangeable cations. Aluminum phosphate molecular sieves are synthesized by hydrothermal crystallization method. First, equimolar activated alumina hydrate and phosphoric acid are mixed in water to form aluminum phosphate gel, and then organic templates are added, stirred evenly and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/54C01B37/04B01J29/83
Inventor 任杰金辉黄国文
Owner ZHEJIANG UNIV OF TECH