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Preparation and use of samarium oxide catalyst

A catalyst, samarium oxide technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problems of high by-product CO2 and low hydrocarbon selectivity , to achieve the effect of stable performance and simple manufacturing process

Inactive Publication Date: 2007-08-22
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the isomerization synthesis catalysts reported in the literature, the target product isomer C 4 The selectivity of hydrocarbons is not very high, and the by-product CO 2 still more

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0007] The present invention provides a kind of preparation method and application of samarium oxide catalyst; The preparation of samarium oxide catalyst is based on samarium nitrate (Sm(NO 3 ) 3 ·6H 2 O) or samarium chloride (SmCl 3 ·6H 2 (2) is raw material, is dissolved in deionized water, is mixed with the aqueous solution that concentration is 0.1-0.3mol / L, drips into the aqueous solution that the ammoniacal liquor that concentration is 20-30wt% accounts for 10% (volume ratio), aging 2- 3h to produce Sm(OH) 3 Hydrogels. Then fully stirred and washed with ionic water, and suction filtered to obtain a filter cake, and the filter cake was placed in air or N at 110 ° C. 2 Dry in an air atmosphere for 5-24h, and the dried sample is placed in a muffle furnace at 500-600°C in air or N 2 Roasting in air atmosphere for 3-8h, the prepared samarium oxide catalyst is denoted as Sm 2 o 3 -B, Sm 2 o 3 -C, Sm 2 o 3 -D, Sm 2 o 3 -B*, Sm 2 o 3 -D* or Sm 2 o 3 -E*.

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Embodiment 1

[0034] Sm prepared using the above method 2 o 3 -B is used as a catalyst for isomerization synthesis, the amount of catalyst is 500mg, using CO / H 2 Mixed gas (CO:H 2 =1:1) is the reaction raw material gas, the flow rate of the raw material gas is 12ml / min, and the isomerization synthesis reaction is carried out at a total pressure of 5.0MPa and a reaction temperature of 425°C. Analysis reaction tail gas, the conversion rate that obtains carbon monoxide is 4.4%, and the selectivity of total hydrocarbon product is 56.0%, and isobutene and isobutane account for C 4 The proportion of hydrocarbons was 85.0%. The analysis results are listed in Table 1.

Embodiment 2

[0036] Except for the Sm prepared by the above method 2 o 3 -C is used as a catalyst, and other operations are the same as in Example 1. The analysis results are listed in Table 1.

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PUM

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Abstract

The present invention belongs to the field of catalyst preparation in chemical technology. The samarium nitrate or samarium chloride is prepared into the samarium oxide catalyst through the steps of dissolving in deionized water, dropping into ammonia water solution as precipitant, ageing, washing, drying and roasting to obtain the samarium oxide catalyst of Sm2O3-B, Sm2O3-C, Sm2O3-D, Sm2O3-B*, Sm2O3-D* or Sm2O3-E*. The catalyst is used in the isomerized synthesis with mixed CO and H2 material under heating and pressurized condition in a fixed bed reactor to obtain isomerized C4 hydrocarbon product. It has CO converting rate of 3-8 %, isomerized C4 hydrocarbon mixture gas selectivity of 42-69 %, the ratio between the C4 hydrocarbon to isomerized C4 hydrocarbon mixture gas of 35-77 %, and the ratio of isobutylene and isobutane to isomerized C4 hydrocarbon of 44-100 %.

Description

technical field [0001] The invention belongs to the field of catalyst preparation in chemical technology, and in particular relates to a preparation method and application of a samarium oxide catalyst. Background technique [0002] Isobutene and isobutane are important organic chemical raw materials. Chemical products such as isobutanol, methyl tert-butyl ether, methacrylic acid, tert-butylamine, di-tert-butylphenol, tert-butylmercaptan, and methacrylonitrile can be prepared from isobutene, among which isobutanol is still Excellent gasoline additive. Isobutene is oligomerized to obtain isooctene and then hydrogenated to obtain isooctane. As a gasoline additive, isooctane can increase the octane number of gasoline. Dehydrogenation of isobutane produces isobutene. At present, isobutene is mainly obtained from the by-product C4 fraction in the process of producing ethylene from naphtha steam cracking and catalytic cracking. The strong growth of market demand makes the suppl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/10B01J37/03
Inventor 贺德华董国利师磊李映伟朱起明
Owner TSINGHUA UNIV