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A kind of low-carbon alkane dehydrogenation catalyst and its preparation method and application

A low-carbon alkane and catalyst technology, which is applied in the field of low-carbon alkane chemical utilization, can solve the problems of high price of Pt-based catalyst, low olefin selectivity, and high single-pass conversion rate, and achieves high alkane single-pass conversion rate, simple method and raw materials. easy-to-get effect

Active Publication Date: 2021-07-27
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to overcome the problems that the traditional Cr-based catalyst is not friendly to the environment, the Pt-based catalyst is expensive, and the catalyst prepared by the traditional impregnation method is difficult to precisely regulate the structure of the alloy catalyst, the olefin selectivity is not high and the stability is not good. The present invention Creatively designed a new type of catalytic system for the anaerobic catalytic dehydrogenation of low-carbon alkanes. The developed catalyst has good stability, high olefin selectivity and high single-pass conversion rate, and has a very high commercial application prospect

Method used

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  • A kind of low-carbon alkane dehydrogenation catalyst and its preparation method and application
  • A kind of low-carbon alkane dehydrogenation catalyst and its preparation method and application
  • A kind of low-carbon alkane dehydrogenation catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Weigh 100g SAPO-34 molecular sieve (silicon-aluminum ratio is 0.5), put it into 10mol / L nitric acid solution, stir at 80°C for 12 hours, then filter and fully wash with deionized water until the pH of the filtrate is 7.0; then the washed solid sample was dried in an oven at 100°C for 5 hours, and placed in a muffle furnace for 5 hours at 500°C;

[0040] (2) Take 6 samples of 10.0 g each of the samples treated in step (1), and put them into Co(NO 3 ) 2 , Ni(NO 3 ) 2 , FeCl 2 , Pd(NO 3 ) 2 , Ru(NO 3 ) 3 and RhCl 3 Perform ion exchange in the solution, the concentration of the above solutions is 1.0mol / L, the temperature of ion exchange is 90°C, the time is 15 hours, and the pH value of the solution is 6.9-7.1;

[0041] (3) After ion exchange, use a circulating water vacuum pump (SGB-III) to carry out vacuum filtration (0.01MPa), and fully wash with deionized water until the pH value of the filtrate is 7.0; then wash the solid sample in an oven for 100 ℃ drying...

Embodiment 2

[0046] (1) Weigh 100g of 4A molecular sieve, put it into 10mol / L nitric acid solution, stir and treat it at 80°C for 12 hours, then filter and wash fully with deionized water until the pH value of the filtrate is 7.0; then wash the solid The sample was dried in an oven at 100°C for 5 hours, and placed in a muffle furnace at 500°C for 5 hours;

[0047] (2) Take 6 samples of 10.0 g each of the samples treated in step (1), and put them into Co(NO 3 ) 2 、NiSO 4 , FeCl 2 , Pd(NO 3 ) 2 , Ru(NO 3 ) 3 and RhCl 3 Perform ion exchange in the solution, the concentration of the above solutions is 1.0mol / L, the temperature of ion exchange is 90°C, the time is 15 hours, and the pH value of the solution is 6.9-7.1;

[0048] (3) step (3) is identical with step (3) in embodiment 1, makes the molecular sieve catalyst containing active metal component;

[0049] (4) The catalyzer in the step (3) adopts impregnation method to impregnate auxiliary agent Mn(NO 3 ) 2 solution, Mn(NO 3 ) ...

Embodiment 3

[0052] Take in embodiment 1 by Ni(NO 3 ) 2 The solution realizes ion exchange, and the molecular sieve catalyst Ni / SAPO-34 sample containing active metal components treated in step (3), the solution impregnated in step (4) is replaced by Cu(NO 3 ) 2 solution and Mg(NO 3 ) 2 solution, and the rest of the processes were the same to prepare catalysts Ni-Cu / SAPO-34-IE and Ni-Mg / SAPO-34-IE.

[0053] The contents of active components and promoter metals in the prepared catalysts analyzed by ICP are shown in Table 1. As can be seen from the data in Table 1, the impregnated solutions were replaced by Cu(NO 3 ) 2 solution and Mg(NO 3 ) 2 solution, it can also effectively dope additive metals Cu and Mg, the content of Cu in the catalyst Ni-Cu / SAPO-34-IE is 0.17wt%, and the content of Mg in the catalyst Ni-Mg / SAPO-34-IE is 0.19 wt%.

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Abstract

The invention discloses a low-carbon alkane dehydrogenation catalyst, a preparation method and application thereof, and belongs to the field of low-carbon alkane chemical utilization. The catalyst prepared by the present invention is one or more than two kinds of active metals in Fe, Co, Ni, Ru, Rh and Pd, one or more than two kinds of auxiliary agents and SAPO‑34, 3A, 5A and 4A molecular sieves The carrier is composed of, wherein the active metal component accounts for 0.5-10% of the mass of the catalyst, the auxiliary metal component accounts for 0.01-2% of the mass of the catalyst, and the balance is the carrier. The catalyst prepared by the preparation method of the invention can effectively catalyze low-carbon alkanes (C2-C6) to generate olefin products, has high conversion rate of alkanes per pass, selectivity of olefins in the range of 97-99.5%, and has very good stability. The catalyst preparation method of the invention is relatively simple and has industrial application prospects.

Description

technical field [0001] The invention relates to a low-carbon alkane dehydrogenation catalyst, a preparation method and application thereof, and belongs to the field of low-carbon alkane chemical utilization. Background technique [0002] Low-carbon alkanes, including C2-C6 paraffins, mainly come from natural gas, oilfield associated gas, shale gas, by-products of petrochemical and oil refining processes. They are plentiful and cheap, and because of their inert saturated carbon-hydrogen bonds, they have narrow industrial uses and have been used as low-value fuels. Efficient conversion of them to produce corresponding olefins can not only accelerate the use of non-traditional fuel gas as a supplementary raw material for fossil energy, but also relieve the chemical industry's high dependence on petroleum resources. [0003] The catalytic dehydrogenation of light alkanes to olefins includes aerobic environment and anaerobic environment. In an aerobic environment (such as CO 2...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/85B01J29/78B01J29/76B01J37/08B01J37/30C07C5/333C07C11/04C07C11/06
CPCB01J29/7607B01J29/7807B01J29/85B01J37/08B01J37/30B01J2229/183C07C5/333C07C11/04C07C11/06Y02P20/52
Inventor 刘小浩胥月兵姜枫刘冰
Owner JIANGNAN UNIV
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