CN111229298A - In-situ synthesis of Pt-HZSM-5 supported catalyst - Google Patents
In-situ synthesis of Pt-HZSM-5 supported catalyst Download PDFInfo
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- CN111229298A CN111229298A CN201811437783.4A CN201811437783A CN111229298A CN 111229298 A CN111229298 A CN 111229298A CN 201811437783 A CN201811437783 A CN 201811437783A CN 111229298 A CN111229298 A CN 111229298A
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- hzsm
- molecular sieve
- supported catalyst
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- ethylene glycol
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J29/00—Catalysts comprising molecular sieves
- B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
- B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
- B01J29/40—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11, as exemplified by patent documents US3702886, GB1334243 and US3709979, respectively
- B01J29/42—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11, as exemplified by patent documents US3702886, GB1334243 and US3709979, respectively containing iron group metals, noble metals or copper
- B01J29/44—Noble metals
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
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Abstract
The invention discloses a method for in-situ synthesis of a Pt-HZSM-5 supported catalyst, which comprises the steps of adding an HZSM-5 molecular sieve into a reaction solution for synthesizing Pt nanoparticles, and loading the Pt nanoparticles on the HZSM-5 molecular sieve in situ. The preparation method is simple and easy to operate, and Pt is uniformly dispersed on the HZSM-5 molecular sieve and has strong binding force with the molecular sieve. The Pt-HZSM-5 composite catalyst is a bifunctional catalyst, has catalytic cracking performance and a dehydrogenation function, can be used for catalytic cracking reaction of alkane, and improves the conversion rate of the alkane and the yield of low-carbon alkene.
Description
Technical Field
The invention relates to the field of catalyst preparation, in particular to a technology for synthesizing a supported catalyst in situ.
Background
The catalyst is one of the key factors influencing catalytic cracking reaction, and the high-efficiency catalytic cracking catalyst is always a hotspot of research in the field. The catalytic cracking catalysts commonly used at present include molecular sieve catalysts, metal oxide catalysts and composite catalysts.
The molecular sieve with regular pore channels has the advantages of shape selectivity, strong acidity, easy modulation, high yield of low-carbon olefin and the like, and is the most widely researched catalyst at present. The low-carbon alkane resources in China are relatively surplus, the utilization rate is low, and the method has important significance for preparing the low-carbon olefin by using the low-carbon alkane as the raw material for catalytic cracking in order to improve the chemical utilization rate of the low-carbon alkane. However, alkane has the disadvantages of low conversion rate and low yield of low-carbon olefin compared with the olefin with the same carbon number. For the supported nano metal catalyst, the inherent properties of the metal and the carrier can improve the catalytic performance of the catalyst, so the invention discloses a preparation method for in-situ synthesis of the Pt-HZSM-5 supported catalyst, which enables Pt to be uniformly dispersed on an HZSM-5 molecular sieve and has stronger binding force with the molecular sieve, so that the catalyst has catalytic cracking performance and dehydrogenation function, can be used for catalytic cracking reaction of low-carbon alkane, and improves the conversion rate of the alkane and the yield of the low-carbon alkene.
Disclosure of Invention
The invention mainly solves the technical problem of providing a preparation method of a Pt-HZM-5 supported catalyst, and solves the problems of uneven dispersion and poor binding force of Pt on an HZSM-5 molecular sieve.
In order to solve the technical problems, the invention provides a preparation method of an in-situ synthesized Pt-HZSM-5 supported catalyst, which comprises the following steps: adding a certain amount of molecular sieve into the ethylene glycol solution, performing ultrasonic treatment, and stirring to uniformly disperse HZSM-5 in the ethylene glycol solution; heating to 110 deg.C, and maintaining for 30 min; respectively dissolving a certain amount of chloroplatinic acid and polyvinylpyrrolidone in ethylene glycol, simultaneously dripping 0.5mL of chloroplatinic acid and polyvinylpyrrolidone into an ethylene glycol solution of HZSM-5, reacting for 1.5h, centrifuging, washing and drying to obtain the Pt-HZSM-5 supported catalyst. The method can ensure that the Pt is uniformly dispersed on the HZSM-5 molecular sieve and has stronger binding force with the molecular sieve. The Pt-HZSM-5 supported catalyst has catalytic cracking performance and a dehydrogenation function, can be used for catalytic cracking reaction of alkane, and improves the conversion rate of the alkane and the yield of low-carbon alkene.
Drawings
FIG. 1 is a transmission electron micrograph of a Pt-HZSM-5 supported catalyst in example.
Detailed Description
(1) Adding quantitative HZSM-5 molecular sieve into ethylene glycol solution, ultrasonically stirring to uniformly disperse the HZSM-5 molecular sieve in the ethylene glycol solution, heating to 110 deg.C, and maintaining for 30min
(2) Respectively dissolving a certain amount of chloroplatinic acid and polyvinylpyrrolidone into ethylene glycol, simultaneously dripping 0.5mL of chloroplatinic acid and polyvinylpyrrolidone into the solution obtained in the step (1), and reacting for 1.5 h;
(3) and after the reaction is finished, cooling, centrifuging, washing and drying to obtain the Pt-HZSM-5 supported molecular sieve.
The above embodiments are only for the purpose of promoting an understanding of the core concepts of the invention, and any obvious modifications, equivalents or other improvements made without departing from the spirit of the invention are intended to be included within the scope of the invention.
Claims (4)
1. In-situ synthesizing a Pt-HZSM-5 supported catalyst; the method is characterized in that: adding an HZSM-5 molecular sieve into a reaction solution for synthesizing the Pt nano particles, and loading Pt on the HZSM-5 molecular sieve in situ.
2. The in situ synthesized Pt-HZSM-5 supported catalyst of claim 1; the method is characterized in that: adding a certain amount of molecular sieve into the ethylene glycol solution, performing ultrasonic treatment, and stirring to uniformly disperse HZSM-5 in the ethylene glycol solution; heating to 110 deg.C, and maintaining for 30 min; respectively dissolving a certain amount of chloroplatinic acid and polyvinylpyrrolidone in ethylene glycol, simultaneously dripping 0.5mL of chloroplatinic acid and polyvinylpyrrolidone into an ethylene glycol solution of HZSM-5, reacting for 1.5h, centrifuging, washing and drying to obtain the Pt-HZSM-5 supported catalyst.
3. The in situ synthesized Pt-HZSM-5 supported catalyst of claim 1; the method is characterized in that: the Pt is uniformly dispersed on the HZSM-5 molecular sieve, and the binding force between the Pt and the molecular sieve is stronger.
4. The in situ synthesized Pt-HZSM-5 supported catalyst of claim 1; the method is characterized in that: the Pt-HZSM-5 supported catalyst has catalytic cracking performance and a dehydrogenation function, can be used for catalytic cracking reaction of alkane, and improves the conversion rate of the alkane and the yield of low-carbon alkene.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811437783.4A CN111229298A (en) | 2018-11-29 | 2018-11-29 | In-situ synthesis of Pt-HZSM-5 supported catalyst |
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| CN201811437783.4A CN111229298A (en) | 2018-11-29 | 2018-11-29 | In-situ synthesis of Pt-HZSM-5 supported catalyst |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115722070A (en) * | 2021-08-25 | 2023-03-03 | 中国科学院城市环境研究所 | Electromagnetic induction heating material, preparation method and application thereof in VOCs purification |
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2018
- 2018-11-29 CN CN201811437783.4A patent/CN111229298A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115722070A (en) * | 2021-08-25 | 2023-03-03 | 中国科学院城市环境研究所 | Electromagnetic induction heating material, preparation method and application thereof in VOCs purification |
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