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Catalyst for catalyzing acetylene to directly prepare styrene, and preparation method and application thereof

A catalyst and styrene technology, applied in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of polyvinyl chloride overcapacity and low industrial profits, and achieve industrial application, short process routes, The effect of low energy consumption

Active Publication Date: 2020-01-03
ENN SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main downstream product of acetylene, polyvinyl chloride (PVC), has a serious overcapacity and low industrial profits. It is urgent to expand the industrial chain of downstream products of acetylene.
However, there are no related studies and reports

Method used

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  • Catalyst for catalyzing acetylene to directly prepare styrene, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Catalyst preparation

[0042]Catalyst component palladium: niobium: H-ZSM-5 molecular sieve mass ratio = 0.5:5:94.5. Select H-ZSM-5 molecular sieve with a silicon-aluminum ratio of 260 for thermal activation roasting treatment, roasting temperature is 550°C, and roast for 8 hours; then weigh 2.89g of niobium oxalate and 9.45g of activated molecular sieve; add niobium oxalate to 10mL Heat and stir in deionized water to form a uniform metal oxide precursor solution; drop the metal oxide precursor solution into molecular sieves for impregnation, and perform ultrasonic treatment for 2 hours after the addition; dry after ultrasonic treatment at a drying temperature of 80°C. The time is 10 hours; after drying, the catalyst precursor is obtained by roasting at a roasting temperature of 350° C. and a roasting time of 5 hours. Weigh 0.11 g of palladium nitrate and add it to 10 mL of dilute nitric acid solution with a concentration of 0.1 mol / L, heat and stir to form a unifo...

Embodiment 2

[0046] (1) Catalyst preparation

[0047] Catalyst component palladium: niobium: H-ZSM-5 molecular sieve mass ratio = 1:8:91. Select H-ZSM-5 molecular sieve with a silicon-aluminum ratio of 260 for thermal activation roasting treatment, roasting temperature 600°C, and roast for 6 hours; then weigh 4.62g of niobium oxalate and 9.1g of activated molecular sieve; add niobium oxalate to 10mL Heat and stir in deionized water to form a uniform metal oxide precursor solution; add the metal oxide precursor solution dropwise into molecular sieves for impregnation, and perform ultrasonic treatment for 3 hours after the dropwise addition; dry after ultrasonic treatment at a drying temperature of 100°C. The time is 8 hours; after drying, the catalyst precursor is obtained by calcining at a calcining temperature of 400°C and for a calcining time of 4 hours. Weigh 0.22 g of palladium nitrate and add it to 10 mL of dilute nitric acid solution with a concentration of 0.1 mol / L, heat and stir ...

Embodiment 3

[0051] (1) Catalyst preparation

[0052] Catalyst component palladium: niobium: H-ZSM-5 molecular sieve mass ratio = 0.8:7:92.2. Select H-ZSM-5 molecular sieve with a silicon-aluminum ratio of 260 for heat-activated roasting treatment at a roasting temperature of 550°C for 8 hours; then weigh 4.05g of niobium oxalate and 9.22g of activated molecular sieve; add niobium oxalate to 10mL Heat and stir in deionized water to form a uniform metal oxide precursor solution; add the metal oxide precursor solution dropwise into molecular sieves for impregnation, and perform ultrasonic treatment for 3 hours after the dropwise addition; dry after ultrasonic treatment at a drying temperature of 100°C. The time is 8 hours; after drying, the catalyst precursor is obtained by calcining at a calcining temperature of 400°C and for a calcining time of 4 hours. Weigh 0.18 g of palladium nitrate and add it to 10 mL of dilute nitric acid solution with a concentration of 0.1 mol / L, heat and stir to ...

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Abstract

The invention relates to the technical field of catalysts, and particularly discloses a catalyst for catalyzing acetylene to directly prepare styrene, and a preparation method and an application thereof. The catalyst is a molecular sieve modified with metal and metal oxide, the metal (niobium, molybdenum, tungsten and zirconium) oxide component for modifying acid sites and the metal (palladium, platinum and ruthenium) component for adsorbing activated reactant molecules are impregnated step by step by a stepwise impregnation process and are limited in pores of a molecular sieve, the catalyticeffect is changed by regulating the quantity of B acid and L acid in the molecular sieve through the metal oxide, and high-dispersion metal site activated reactant molecules are introduced to stabilize intermediate species and improve the performances of the catalyst. A traditional styrene process technical route is broken through, and downstream products of coal-based acetylene are broadened; andcompared with the traditional styrene process technical route, a method for directly reacting the reacting acetylene with benzene under the action of the catalyst to synthesize styrene has the obvious technical advantages of mild reaction conditions, short process route and low energy consumption.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a catalyst for directly preparing styrene by catalyzing acetylene, a preparation method and application thereof. Background technique [0002] As an important basic chemical raw material, styrene is mainly used for synthetic rubber and resin, and its downstream products mainly include styrene-butadiene rubber, polystyrene resin, ABS engineering plastics and other products, which are widely used in industrial applications and have high demand. At present, styrene basically comes from petrochemical technology, and nearly 90% of its production capacity is mainly through ethylbenzene dehydrogenation technology. The process route is first to produce ethylbenzene through benzene and ethylene, and then to produce styrene through dehydrogenation of ethylbenzene. The process route is long and dehydrogenation The hydrogen process is generally a negative pressure adiabatic reaction, and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/48C07C2/38C07C15/46
CPCB01J29/48C07C2/38C07C15/46Y02P20/584
Inventor 杜波王会升赵锐君
Owner ENN SCI & TECH DEV
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