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Method for converting n-alkane into fully conjugated polyene

A technology of n-alkanes and conjugated polyenes, applied in chemical instruments and methods, preparation of organic compounds, catalysts, etc., can solve problems such as unreported synthesis methods

Pending Publication Date: 2022-06-24
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The chemical conversion of long-chain n-alkanes to fully conjugated polyenes involves multistep, controlled C-H bond scission, a previously unreported synthetic approach

Method used

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  • Method for converting n-alkane into fully conjugated polyene
  • Method for converting n-alkane into fully conjugated polyene
  • Method for converting n-alkane into fully conjugated polyene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1: n-docosane (molecule (I)) was grown on the surface of Cu(110) single crystal cleaned by argon sputtering annealing by organic molecular beam epitaxy, wherein the diameter of the substrate was 9 mm, and the lining was The bottom temperature is room temperature, and the deposition environment is ultra-high vacuum (1x10 -10 mbar), the deposition temperature was 100 degrees Celsius, and the deposition time was 5 minutes. The deposited samples were characterized by scanning tunneling microscopy (Omicron LT-STM, Germany) as follows figure 1 a shown. Due to the mismatch between the molecular and the substrate period in the assembled structure, in scanning tunneling microscopy, such as figure 1 A superstructure pattern with a period of 14.7 Å is shown in b. The frequency-shifted images obtained by in situ scanning with a non-intrusive atomic force microscope (Omicron LT-STM, Germany) are as follows: figure 1 c shown.

[0038] The samples were annealed at 180°C f...

Embodiment 2

[0039] Example 2: growing n-docosane (molecule (I)) onto a clean Cu (110) single crystal surface by organic molecular beam epitaxy, wherein the substrate diameter is 9 mm, the substrate temperature is room temperature, and the deposition The environment is ultra-high vacuum (1x10 -10 mbar), the deposition temperature was 105 degrees Celsius, and the deposition time was 10 minutes. The deposited samples were characterized by scanning tunneling microscopy as Figure 4 a shown.

[0040] The alkane-deposited sample was heated by a thermal radiation heating stage at a constant heating power (5 watts) for one hour, and the substrate temperature measured by the thermocouple was 196.2 degrees Celsius. The heat-treated samples were characterized by scanning tunneling microscopy, and the results were as follows Figure 4 b shown. There are both unreacted alkane molecules and converted olefin molecules on the surface.

[0041] The samples were further annealed at higher heating powe...

Embodiment 3

[0043] Example 3: Octadecylbenzene (Molecule (III)) was grown on a clean Cu(110) single crystal surface by organic molecular beam epitaxy, wherein the substrate diameter was 9 mm, the substrate temperature was room temperature, and the deposition environment for ultra-high vacuum (1x10 -10 mbar), the deposition temperature was 40 degrees Celsius, and the deposition time was 2 minutes. The deposited samples were characterized by scanning tunneling microscopy as Figure 5 a shown.

[0044] The samples were annealed at 120°C for one hour in an ultra-high vacuum chamber using a thermal radiation heating stage. The treated samples were characterized by scanning tunneling microscopy as Figure 5 b shown. The originally assembled octadecylbenzene molecules became discrete monomers, implying that the conversion of alkanes to polyenes took place. Characterized by non-contact atomic force microscopy, the alkane components in the dispersed single molecules have all been converted in...

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Abstract

The invention relates to a method for converting n-alkanes into fully conjugated polyenes. The invention belongs to the technical field of alkane conversion. The method is characterized in that a transition metal surface, a metal oxide surface selected from ZnO, CuOx and TiO2, a transition metal-loaded oxide surface selected from ZnO, CuOx and TiO2, and a transition metal-loaded straight-hole molecular sieve are used as catalysts. According to the invention, chemical conversion from long-chain n-alkanes to fully-conjugated polyenes is realized.

Description

technical field [0001] The invention belongs to the technical field of alkane conversion. Specifically, it relates to a technical method for converting long-chain n-alkanes into fully conjugated polyenes. Background technique [0002] Alkanes, a major component of petrochemical resources such as oil and natural gas, are commonly used as fuels. Simple alkane molecules only contain low polarity, high bond energy and chemically inert C(sp 3 )-H bonds and C-C bonds, so it is highly challenging to selectively activate the chemical bonds of alkane molecules. In the petrochemical industry, the first conversion of alkanes to olefins is usually the first step in obtaining high value-added chemicals. In general, the direct dehydrogenation of alkanes can provide alpha olefins and even diolefins in considerable yields, but the deep dehydrogenation of alkanes is often uncontrollable and prone to a series of side effects such as isomerization, aromatization and even coking. reaction. ...

Claims

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Application Information

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IPC IPC(8): C07C5/333C07C11/21C07C15/44C07C15/58C07C29/00C07C33/02
CPCC07C5/3335C07C29/00C07C2523/72C07C11/21C07C15/44C07C15/58C07C33/02
Inventor 迟力峰张海明李雪超牛凯丰张俊杰郝争明
Owner SUZHOU UNIV
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