Preparation method and use of difunctional low-carbon alkane dehydrogenation catalyst

A technology for dehydrogenation catalysts and low-carbon alkanes, which is applied in the direction of hydrocarbons, hydrocarbons, metal/metal oxides/metal hydroxide catalysts, etc., can solve the problem of different dehydrogenation catalysts and oxidation catalysts, and achieve inhibition Effects of carbon deposition, low acid content on the surface, and low carbon deposition

Inactive Publication Date: 2015-01-07
南京沃来德能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above two disclosed methods realize the combination of oxidative dehydrogenation and hydrodehydrogenation, but the dehydrogenation catalyst and oxidation catalyst used are different

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The preparation of the catalyst is the same as in Comparative Example 1.

[0047] The propane dehydrogenation process scheme is as follows: fill the catalyst precursor in the isothermal reactor, feed hydrogen, and reduce at 500°C for 10 hours to reduce the catalyst precursor to a low-carbon alkane dehydrogenation catalyst, and then feed hydrogen, water vapor and Mixed gas of propane, inject air into the reactor at the same time, carry out propane dehydrogenation reaction at 580~640°C, wherein: the molar ratio of hydrogen to propane is 0.33, the molar ratio of water vapor to propane is 0.3, and the reaction pressure is 0.3Mpa, the mass space velocity of propane fed is 8h -1 , the molar ratio of oxygen and hydrogen injected into the reactor is 0.025, and the injection amount of oxygen-containing compound is calculated according to this ratio. After the reaction product is separated from hydrogen, water, cracked products and olefins, the unreacted propane is recycled back...

Embodiment 2

[0050] The preparation of the catalyst is the same as in Comparative Example 2.

[0051] The isobutane dehydrogenation process scheme is as follows: an adiabatic radial reactor is used, and a heater is installed in front of the reactor to supplement the heat required for the reaction. Fill the catalyst precursor in the reactor, pass into hydrogen, reduce 5 hours at 550 ℃, make the catalyst precursor reduction become low-carbon alkane dehydrogenation catalyst, pass into the mixed gas of hydrogen, water vapor and isobutane then, simultaneously Inject air into the reactor, and carry out isobutane dehydrogenation reaction at 570~620°C, wherein: the molar ratio of hydrogen to isobutane is 2.0, the molar ratio of water vapor to isobutane is 0.1, and the reaction pressure is 0.1Mpa, the mass space velocity of the isobutane fed is 5h -1 , the molar ratio of oxygen and hydrogen injected into the reactor is 0.02, and the injection amount of oxygen-containing compound is calculated acco...

Embodiment 3

[0054] The catalyst preparation process is as follows:

[0055] Step a, gamma-Al prepared by known drop ball forming method 2 o 3 The pellets are used as a carrier, impregnated with zinc nitrate aqueous solution for 6 hours at 70°C, and then dried for 8 hours at 100°C;

[0056] Step b, using the catalyst carrier loaded with metal Zn ions obtained in step a, at 70°C, impregnating the lanthanum nitrate aqueous solution for 6h, then at 100°C, drying for 8h; 500°C, roasting for 6h;

[0057] Step c, γ-Al loaded with metal Zn ions and La ions obtained by step b 2 o 3 The pellet carrier was then immersed in an aqueous sodium chloride solution at 70°C for 6h, then dried at 100°C for 8h; roasted at 500°C for 6h;

[0058] Step d, γ-Al loaded with metal Zn ions, La ions and Na ions obtained by step c 2 o 3 The small ball carrier is then at 70°C, impregnated with chloroplatinic acid aqueous solution, tin tetrachloride aqueous solution and 25wt% hydrochloric acid aqueous solution for...

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PUM

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Abstract

The invention discloses a preparation method and use of a difunctional low-carbon alkane dehydrogenation catalyst. The difunctional low-carbon alkane dehydrogenation catalyst is prepared by a dipping method, utilizes gamma-Al2O3 as a carrier, Pt as an active component, and Sn, Na, La and Zn as auxiliary agents, and optionally contains Cl as a modifier. Under the low-carbon alkane dehydrogenation conditions, hydrogen-vapor-low carbon alkane mixed gas and an oxygen-containing compound are simultaneously injected into a reactor, and the catalyst in the reactor has dual functions of low-carbon alkane dehydrogenation and hydrogen selective combustion. Through selective combustion of hydrogen, dehydrogenation reaction equilibrium is shifted toward right and simultaneously, the released combustion heat can be supplied for a dehydrogenation reaction. Through use of the difunctional low-carbon alkane dehydrogenation catalyst, a dehydrogenation reaction conversion rate and selectivity are high and stability is good.

Description

technical field [0001] The invention relates to a preparation method and application of a dual-functional low-carbon alkane dehydrogenation catalyst, which is suitable for gas-solid phase catalytic reactions and belongs to the technical field of industrial catalysis. Background technique [0002] The dehydrogenation reaction of low-carbon alkanes is a process of converting large quantities of cheap low-carbon alkanes into corresponding alkenes with high added value that are in short supply in the market, which has important research significance and economic value. [0003] The dehydrogenation of light alkanes can be divided into two forms: oxidative dehydrogenation and hydrodehydrogenation. The enthalpy change of oxidative dehydrogenation is less than zero, which is an exothermic reaction without external heating, saving energy, and the reaction is not limited by thermodynamic equilibrium. However, oxidative dehydrogenation of olefins results in low selectivity since olefi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63C07C11/06C07C11/09C07C11/04C07C5/333
CPCY02P20/52
Inventor 王向华黄力吴沛成刘宽张建国周钰明孙勇徐隽
Owner 南京沃来德能源科技有限公司
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