Platinum-based catalyst with SiO2 (at) C as carrier and preparation method and application of platinum-based catalyst

Abstract

The invention discloses a platinum catalyst with SiO2 (at) C as a carrier and a preparation method and application of the platinum catalyst. The preparation method comprises the following steps: firstly, preparing a SiO2 inner core by adopting a stober method, then adding a carbon source precursor to coat the SiO2 inner core, then preparing a SiO2 (at) C core-shell structure carrier with an inner core silicon dioxide and an outer graphitized carbon shell layer through high-temperature roasting, finally impregnating the carrier with a precursor solution of platinum, drying and then reducing to obtain the platinum-coated C core-shell structure carrier. The core-shell structure platinum-based catalyst comprises the inner core SiO2 in the graphitized carbon shell and is loaded with the active metal Pt nano-particles outside the graphitized carbon shell. The prepared catalyst is novel in structure, has good activity and stability in a low-carbon alkane dehydrogenation reaction, is simple in preparation method, and has important reference significance in development of low-carbon alkane catalysts with high stability and activity.

Description

technical field [0001] The present invention relates to a kind of low-carbon alkane reaction dehydrogenation catalyst and preparation method thereof, specifically, is a kind of SiO 2 A platinum-based catalyst with a core-shell structure as the inner core and C as the outer shell as a carrier, and a preparation method and application thereof. Background technique [0002] The catalysts commonly used in the process of dehydrogenation of propane to propylene are Pt catalysts, and the commonly used supports are alumina, molecular sieve, magnesium-aluminum spinel, etc., but dehydrogenation of propane to propylene is a thermodynamically limited reaction, requiring high temperatures above 550 °C In order to achieve the equilibrium conversion rate required in industry, high temperature can easily cause the sintering of platinum particles and lead to the traditional commercial catalyst Pt / Al 2 O 3 In addition, due to the interaction of acidity and weak metal support, the propane de...

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Problems solved by technology

[0002] The catalysts commonly used in the process of propane dehydrogenation to propylene are Pt-based catalysts, and commonly used supports include alumina, molecular sieves, magnesium-aluminum spinel, etc. However, propane dehydrogenation to propylene is a thermodynamically limited reaction that requires high temperatures above 550 °C In order to achieve the equilibrium conversion rate required by the industry, the high temperature can easily cause the sintering of platinum particles and lead to the sintering of the traditional commercial catalyst Pt / Al 2 o 3 Inactivation, in addition, due to the interaction of acidity and weaker metal supports, the propane dehydrogenation reaction is accompanied by side reactions such as cracking, hydrogenolysis and isomerization, so a catalyst with high activity and stability can be constructed, tuned and constructed The fine structure of the active substance and its interaction with the carrier are of great significance

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