N-butane isomerization catalyst and preparation method thereof
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A technology for isomerization and n-butane, which is applied in the field of n-butane isomerization catalyst and its preparation, can solve the problems of high reaction temperature and large energy consumption, and achieves low reaction temperature, high n-butane isomerization activity, Good reproducibility and catalytic stability
Inactive Publication Date: 2017-08-18
CHINA UNIV OF PETROLEUM (BEIJING)
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Molecular sieve catalysts require high reac
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Embodiment 1
[0054] The present embodiment provides a kind of preparation method of n-butane isomerization catalyst, it comprises the following steps:
[0055] (1) Preparation of nano-scale tetragonal zirconia support
[0056] Get zirconium oxychloride and lanthanum nitrate to be dissolved in deionized water (concentration of zirconium is 0.4mol / L, and the content of lanthanum is 2% (w)), while stirring, drip the ammoniacal liquor that concentration is 10% to adjust pH, make solution pH = 7-8, then moved into a hydrothermal kettle, hydrothermally reacted at 170°C for 24 hours; after cooling down, filtered and washed with a Buchner funnel, and dried at 110°C for 24 hours to obtain a nano-sized tetragonal zirconia carrier. figure 1 It is a nanoscale tetragonal zirconia support electron micrograph, figure 2 It is the XRD spectrum of nano-sized tetragonal zirconia.
[0057] (2) Composite pickling molding
[0058] The nanoscale tetragonal phase zirconia carrier prepared in step (1) is confi...
Embodiment 2
[0062] Identical with embodiment 1 operating method, difference is (1) step takes zirconium oxychloride to be dissolved in deionized water (concentration of zirconium is 0.4mol / L, and the content of lanthanum is 0% (w)) and makes catalyst B, Its active component content and n-butane isomerization rate are shown in Table 1.
Embodiment 3
[0064] The operation method is the same as in Example 1, except that (1) the step is to dissolve zirconium oxychloride in deionized water, and while stirring, dropwise add ammonia water with a concentration of 10% to adjust the pH to make the solution pH=7-8, and then move into Hydrothermal kettle, hydrothermal reaction at 170°C for 24 hours; after cooling down, use a Buchner funnel to filter and wash, then dip lanthanum nitrate into an aqueous solution, then filter and wash, and dry at 110°C for 24 hours (the concentration of zirconium is 0.4mol / L, The content of lanthanum is 2% (w)) and catalyst C is prepared, and its active component content and n-butane isomerization rate are shown in Table 1.
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Abstract
The invention provides an n-butane isomerization catalyst and a preparation method thereof. The preparation method comprises the following steps: preparing hydroxide by using a coprecipitation method, introducing lanthanum salt to increase the ratio of a tetragonal phase, performing hydro-thermal treatment, drying so as to obtain zirconium oxide which is sufficiently crystallized into the tetragonal phase, soaking to load a sulfate radical and molybdate, roasting so as to increase the acid strength of the catalyst, molding, further soaking into a VIII group metal, and performing synthesis, thereby obtaining the n-butane isomerization catalyst which adopts the tetragonal phase zirconium oxide as a carrier. The n-butane isomerization catalyst adopts the nano-grade tetragonal phase zirconium oxide as the carrier; on the basis of the dry basis of the tetragonal phase zirconium oxide carrier, the n-butane isomerization catalyst comprises the following active components in percentage by mass: 0.5-5.0% of lanthanum, 0.5-2.5% of sulfur, 0.5-2.5% of molybdenum and 0.01-5.0% of the VIII group metal. The n-butane isomerization catalyst is high in isomerization activity and selectivity, good in repeatability and catalysis stability, low in reaction temperature, and still relatively high in n-butane isomerization activity at high temperature.
Description
technical field [0001] The invention relates to a n-butane isomerization catalyst and a preparation method thereof, belonging to the technical field of catalyst preparation. Background technique [0002] With the increasingly stringent environmental protection requirements, the quality specification requirements of automotive gasoline products are getting higher and higher. Aromatics reduction, sulfur reduction, and olefin reduction are measures that must be taken to improve gasoline quality. Clean gasoline standards are developing towards low sulfur, low olefins, and low aromatics, so that people continue to take measures to further reduce the sulfur content and olefins in catalytic gasoline from the aspects of raw material pretreatment, new process development of catalytic cracking, and catalytic gasoline post-treatment. From the perspective of product blending, increasing isoparaffins and developing environmentally friendly new processes can increase the octane number of...
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