Propane dehydrogenation catalyst and preparation method thereof

A propane dehydrogenation and catalyst technology, which is applied in catalyst activation/preparation, catalyst, catalyst carrier and other directions, can solve the problems of catalyst deactivation, instability of platinum metal and tin, poor stability, etc., and achieves good application prospects and improved conversion rate. , the effect of selective enhancement

Active Publication Date: 2018-07-27
贵研工业催化剂(云南)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN1201715 discloses a kind of Pt-Sn-K/Al 2 o 3 The preparation method of low-carbon alkanes (C1-C5) dehydrogenation catalyst, the propane conversion rate and the selectivity of the catalyst are very high, but the catalyst is prone to carbon deposition and deactivation under high temperature condit

Method used

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  • Propane dehydrogenation catalyst and preparation method thereof
  • Propane dehydrogenation catalyst and preparation method thereof
  • Propane dehydrogenation catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1.1. Preparation of carrier

[0033] Weigh 6.41g of magnesium nitrate, add 50mL of absolute ethanol, and sonicate for 0.5h; at the same time, weigh 10.21g of aluminum isopropoxide, pour it into 100mL of absolute ethanol, sonicate for 0.5h, and stir magnetically until the aluminum isopropoxide ethanol solution forms an emulsified cloud solution, slowly add the magnesium nitrate ethanol solution dropwise to the aluminum isopropoxide alcohol solution, the dropping rate is 2s / 1 drop; then continue magnetic stirring for 2h, and then transfer the resulting mixed solution to a hydrothermal kettle for alcohol thermal reaction, the reaction The temperature is 135°C, and the reaction time is 8h. Then add 0.25 g of ammonium borate and continue aging for 12 hours. The reaction product was volatilized at room temperature, then dried at 110°C for 8 hours, the solid product was ground, the solid powder was sieved, the sample was collected, and the crystal plane-oriented magnesium-alu...

Embodiment 2

[0042] 2.1, carrier preparation

[0043]Weigh 6.41g of magnesium nitrate, add 50mL of absolute ethanol, and ultrasonicate for 0.5h; at the same time, weigh 10.21g of aluminum isopropoxide, add 100mL of absolute ethanol, ultrasonicate for 0.5h, and stir magnetically until the aluminum isopropoxide ethanol solution forms an emulsion , slowly add the magnesium nitrate ethanol solution dropwise to the aluminum isopropoxide ethanol solution, the dropping rate is 5s / 1 drop, and then continue magnetic stirring for 2h, then transfer the resulting mixed solution to a hydrothermal kettle for alcohol thermal reaction, the reaction temperature 135°C, reaction time 8h. Then add 12.5 g of ammonium borate and continue to age for 12 hours. The reaction product was volatilized at room temperature, then dried at 110°C for 8 hours, the solid product was ground, the solid powder was sieved, the sample was collected, and it was calcined at 800°C for 9 hours to obtain a crystal plane-oriented magn...

Embodiment 3

[0051] 3.1. Vector preparation

[0052] Weigh 6.41g of magnesium nitrate, add 50mL of absolute ethanol, and ultrasonicate for 0.5h; at the same time, weigh 10.21g of aluminum isopropoxide, add 100mL of absolute ethanol, ultrasonicate for 0.5h, and stir magnetically until the aluminum isopropoxide ethanol solution forms an emulsion , slowly add magnesium nitrate ethanol solution dropwise to the emulsion of aluminum isopropoxide ethanol solution, the dropping rate is 2s / 1 drop, continue magnetic stirring for 2h, and then transfer the resulting mixed solution to a hydrothermal kettle for alcohol thermal reaction , the reaction temperature is 120°C, and the reaction time is 12h. Then add 2.5g of ammonium borate and continue aging for 12h. The reaction product was evaporated at room temperature for 12 hours, then dried at 110°C for 8 hours, ground to obtain a solid sample powder, sieved, and calcined at 600°C for 12 hours to obtain a crystal plane-oriented magnesium-aluminum spine...

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Abstract

The invention discloses a propane dehydrogenation catalyst, which is obtained by loading metal platinum on magnesium aluminate spinel carriers, wherein the metal platinum of the catalyst is in a one-dimensional or two-dimensional highly dispersed state on the surface of the carrier; platinum atoms exist in a single atom or sub-nanometer cluster form; the particle diameter of the sub-nanometer cluster is smaller than 1nm. The invention also discloses a preparation method of the propane dehydrogenation catalyst. Compared with a catalyst prepared by the existing method, the obtained propane dehydrogenation catalyst has the advantages that the conversion rate and the selectivity are obviously improved; the stability is high; good application prospects are realized.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a propane dehydrogenation catalyst and a preparation method thereof. Background technique [0002] Catalytic dehydrogenation of propane is a process for the direct production of propylene from propane. Due to the low molecular activity of propane and the small thermodynamic equilibrium constant of the dehydrogenation reaction, the reaction needs to be carried out at high temperature. Under high-temperature reaction conditions, the surface of the catalyst is easy to coke, and the active metal and support structure are not easy to stabilize. This is the biggest problem facing the development of propane dehydrogenation catalysts. [0003] Platinum (Pt) is recognized as a metal with high dehydrogenation activity. Due to its high price, it is usually required to achieve a high degree of dispersion when used as an active component of a catalyst to improve the utilization...

Claims

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Application Information

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IPC IPC(8): B01J23/58B01J21/10B01J32/00B01J37/02B01J37/08B01J37/18B82Y20/00B82Y30/00B82Y40/00C07C5/333C07C11/06
CPCB01J21/005B01J23/005B01J23/58B01J37/0201B01J37/082B01J37/18B82Y20/00B82Y30/00B82Y40/00C07C5/3337C07C2523/58C07C11/06Y02P20/52
Inventor 隋志军王海之张薇孙利利叶光华朱贻安周静红周兴贵
Owner 贵研工业催化剂(云南)有限公司
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