C-SiC loaded platinum-based catalyst, preparation method and applications thereof

A catalyst, platinum-based technology, applied in the field of platinum-based catalysts, can solve the problems of non-resistance to sintering, low catalyst activity, etc., and achieve the effects of improving conversion rate, simple and feasible preparation method, and avoiding catalyst carbon deposition and deactivation.

Active Publication Date: 2015-11-04
SINOPEC YANGZI PETROCHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the objectives of the present invention is to provide a C-SiC loaded platinum-

Method used

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  • C-SiC loaded platinum-based catalyst, preparation method and applications thereof

Examples

Experimental program
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Example Embodiment

[0039] The preparation method of C-SiC supported platinum-based catalyst comprises the following steps:

[0040] (1) The step of contacting the platinum component precursor, the auxiliary element precursor and C-SiC according to a predetermined ratio (preferably in the presence of a dispersion medium such as water) to obtain a contact product (hereinafter referred to as the contact step);

[0041] (2) A step of calcining the contact product to obtain the C-SiC supported platinum-based catalyst (hereinafter referred to as the calcining step).

[0042] The predetermined ratio can be such that the composition of the C-SiC supported platinum-based catalyst finally obtained after the calcination step complies with the foregoing provisions of the present invention.

[0043] The platinum component precursor refers to the substance that can generate the platinum mentioned above through the roasting of the step (2), preferably the soluble salt and soluble acid of platinum, more prefera...

Example Embodiment

[0053] According to one embodiment of the present invention, the contacting step comprises the following steps:

[0054] (1a) Weighing a predetermined amount of platinum component precursor and additive element precursor, mixing and dissolving them in water, optionally adding an appropriate amount of pH regulator etc. as needed, to prepare an aqueous solution;

[0055] (1b) mixing a predetermined amount of C-SiC with the aqueous solution under stirring to obtain a mixed slurry; and

[0056] (1c) drying (such as at 60-150° C., preferably at 70-120° C.) the mixed slurry to obtain the contact product.

[0057] The "predetermined amount" specified here for the platinum component precursor, the auxiliary element precursor and C-SiC meets the requirements of the present invention with the composition of the C-SiC supported platinum-based catalyst finally obtained after the calcination step The foregoing provisions shall prevail, and no special provisions are required. In view of thi...

Example Embodiment

[0074] Example 1

[0075] Dissolve 0.017g of platinum nitrate (molecular weight: 319.09) and 0.041g of lithium nitrate (molecular weight: 68.9) in 15ml of water to make a mixed solution of platinum nitrate and lithium nitrate, and add BET to the above solution with a surface area of ​​125m 2 g -1 20.1g CDC-SiC porous C-SiC sample with an average pore diameter of 12.2nm (prepared with reference to Journal of Materials Chemistry, 2012, Volume 22, pages 14155-14159), stirred in a constant temperature water bath at 80°C for 10 minutes, and dried at 120°C , and calcined at 620°C for 5 hours to obtain a C-SiC supported platinum-based catalyst, code-named A1, in which the mass percentage of Pt was determined to be 0.05%, and the mass percentage of Li was 0.02%. The prepared C-SiC supported platinum-based catalyst was loaded into a fixed-bed reactor, passed through hydrogen for reduction at 200°C for 5 hours, and then passed through a mixture of propane and hydrogen preheated to 340°...

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Abstract

The present invention discloses a C-SiC composite carrier loaded platinum-based catalyst and a preparation method thereof, and applications of the C-SiC composite carrier loaded platinum-based catalyst in catalytic dehydrogenation reactions of alkyl compounds having more than or equal to a C2-C12 chain. The catalyst comprises, by mass, 96-99.2% of a carrier C-Si, 0.05-2% of a platinum component loaded on the C-SiC, and 0.02-2.0% of an auxiliary agent element loaded on the C-SiC. According to the present invention, the preparation method is simple, feasible and environmentally friendly; compared with the catalyst in the prior art, the C-SiC loaded platinum-based catalyst has the following characteristics that the catalyst integrates the high surface area and the high porosity of the carbon material, the strong interaction between the noble metal Pt and the carbon material, and the like so as to significantly improve the conversion rate of the chain alkyl compound and the selectivity of the corresponding chain alkenyl compound; and the catalyst SiC of the present invention further has excellent thermal conductivity, such that the problems that the local reactor overheating causes the catalyst carbon deposition and deactivation and the like can be avoided.

Description

technical field [0001] The invention relates to a platinum-based catalyst, in particular to a platinum-based catalyst supported by a C-SiC composite carrier. The invention also relates to the preparation method of the C-SiC composite carrier loaded platinum-based catalyst and its application in the dehydrogenation of one or more C2-C12 chain alkyl compounds. Background technique [0002] C2~C12 chain alkyl compounds of cheap C2~C12 (such as ethane, propane, butane, pentane, ethylbenzene, p-diethylbenzene, ethylcyclohexane, etc., sometimes referred to as chain alkyl compounds) The dehydrogenation reaction of C12 alkanyl groups to convert them into corresponding high value-added alkenyl compounds has attracted more and more attention from academia and industry. For example, as important organic chemical raw materials, propylene and butene traditionally mainly come from naphtha steam cracking and heavy oil catalytic cracking units. With the increasing demand for raw materials...

Claims

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Application Information

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IPC IPC(8): B01J23/58B01J23/656B01J23/652B01J23/60B01J23/52B01J23/62B01J23/63B01J35/10C07C11/02C07C5/333
Inventor 刘经伟李泽壮陈韶辉杨爱武柏基业方晓江
Owner SINOPEC YANGZI PETROCHEM
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