Method for preparing low-carbon alkane dehydrogenation catalyst and capable of controlling distribution of active components

A dehydrogenation catalyst and active component technology, applied in the field of catalysis, can solve the problems of low selectivity and insufficient stability of alkane dehydrogenation catalysts

Active Publication Date: 2015-03-18
CNOOC TIANJIN CHEM RES & DESIGN INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the disadvantages of insufficient stability and low selectivity of the alkane dehydrogenation catalysts prepared in the previous literature, and provide a high activity, high selectivity and hydrothermal stability, performance Stable light alkane dehydrogenation catalyst complex

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Weigh 75 grams of chromium trioxide, 5.9 grams of lanthanum nitrate, and 8 grams of sodium nitrate and dissolve them in 90 milliliters of water to obtain an impregnation solution. Take 30 grams of carbon powder and impregnate it with 25 milliliters of impregnation solution, and dry it at room temperature for 30 minutes to obtain a pretreated pore-enlarging agent.

[0030] Take by weighing 240 grams of 100-150 micron pseudo-boehmite powder, 60 grams of 70-120 micron pyrenite powder, mix evenly with the processed pore-enlarging agent, then add 220 milliliters of 8% nitric acid, Kneading is carried out in a kneader to obtain a paste-like mass. The agglomerate was shaped on an extruder, then dried at 120°C for 5 hours, and calcined at 600°C for 4 hours to obtain a semi-finished catalyst.

[0031] Add 50 milliliters of water to the remaining impregnating liquid, impregnate the semi-finished catalyst with the impregnating liquid, then dry at 120°C for 6 hours, and roast at 7...

Embodiment 2

[0039] Weigh 75 grams of chromium trioxide, 7.2 grams of cerium nitrate, and 12 grams of potassium nitrate and dissolve them in 85 milliliters of water to obtain an impregnation solution. After mixing 25 grams of cellulose powder and 10 grams of sawdust powder, impregnate with 30 milliliters of impregnating solution, and dry at 50° C. for 4 hours to obtain a pretreated pore-enlarging agent.

[0040] Weigh 280 grams of pseudo-boehmite powder with a particle size of 70-110 microns, 20 grams of θ-alumina powder with a particle size of 50-80 microns, mix them evenly with the treated pore-enlarging agent, and then add 25% nitric acid 220 to the kneader ml for kneading to obtain a paste-like mass. The agglomerate was shaped on an extruder, then dried at 120°C for 4 hours, and calcined at 600°C for 5 hours to obtain a semi-finished catalyst.

[0041] Add 65 milliliters of water to the remaining impregnating solution, impregnate the catalyst semi-finished product with equal volume, t...

Embodiment 3

[0044] Weigh 75 grams of chromium trioxide, 6.2 grams of zirconyl nitrate, and 3 grams of magnesium nitrate and dissolve them in 100 milliliters of water to obtain an impregnation solution. Take 20 grams of carbon powder and 20 grams of scallop powder, mix them, impregnate them with 50 milliliters of impregnating solution, and dry them at 120° C. for 5 hours to obtain a pretreated pore-enlarging agent.

[0045] Weigh 180 grams of amorphous aluminum hydroxide powder with a particle size of 100-150 microns, 60 grams of pseudo-boehmite of 80-120 microns, 60 grams of noalite powder of 50-70 microns, and the processed pore-enlarging agent Mix well, then add the remaining impregnating liquid and 200 ml of 15% nitric acid in a kneader for kneading to obtain a paste-like mass. The agglomerate was shaped on an extruder, then dried at 120°C for 8 hours, and calcined at 760°C for 3 hours to obtain the finished catalyst a3.

[0046] The propane dehydrogenation reaction performance test m...

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Abstract

The invention relates to a method for preparing a low-carbon alkane dehydrogenation catalyst and capable of controlling distribution of active components. The method is characterized in that a pore-enlarging agent is added in the preparation process of the catalyst, so that the pore volume of the catalyst is increased and the pore distribution of the catalyst is improved. Part of active components are loaded on the pore-enlarging agent and the water content of the pore-enlarging agent is adjusted, so that part of or all of the active components are concentratedly distributed on the surfaces of the pores in the catalyst, and distribution of the active components in the catalyst is controlled.

Description

field of invention [0001] The invention relates to the technical field of catalysis, in particular to a method for preparing a low-carbon alkane dehydrogenation catalyst which controls the distribution of active components. Background of the invention [0002] With the rapid development of the chemical industry and the plastic products industry, the demand for low-carbon olefins has also increased rapidly. For example, the growth rate of demand for propylene as an organic chemical raw material has exceeded that of ethylene. It is a known method to produce low-carbon alkenes such as propylene and butene by dehydrogenating lower-carbon alkanes in the presence of a catalyst. Catalysts include noble metal catalysts using platinum and chromia / alumina catalysts with chromium as the main active component. Both of these catalysts require alkane dehydrogenation reaction at high temperature, which makes the catalyst activity easy to decrease. [0003] Using alumina as a carrier, sup...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/26C07C11/06C07C5/333
CPCY02P20/52
Inventor 杨玉旺戴清高旭东孙彦民于海斌刘红光
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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