Carbon dioxide assisted dehydrogenation catalyst and preparation method thereof

By loading Pt and Group VIB metal carbides onto a honeycomb substrate as a carbon dioxide-assisted dehydrogenation catalyst, the CO2 activation problem was solved, olefin selectivity was improved, equipment modification was simplified, and a highly efficient hydrocarbon oxidative dehydrogenation reaction was achieved.

CN122164459APending Publication Date: 2026-06-09CHINA PETROLEUM & CHEMICAL CORP +1
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Patent Information

Application Number
CN202411793894.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-09
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

In existing technologies, CO2 is far less active than O2, making it difficult to effectively activate CO2 as an oxidant for hydrocarbon oxidative dehydrogenation reactions. This results in low olefin selectivity and complex equipment modifications, and the honeycomb boron nitride catalyst has a limited upper limit on its dehydrogenation capacity.

Method used

A carbon dioxide-assisted dehydrogenation catalyst employing the synergistic combination of Pt and Group VIB metal carbides is developed. By loading Pt and Group VIB metal carbides in a modified silica-alumina coating onto a honeycomb substrate, dual active centers are formed, activating the dissociation and adsorption of CO2 and alkanes, thus avoiding excessive oxidation.

Benefits of technology

It improves olefin selectivity, simplifies equipment modification, reduces energy consumption, avoids carbon buildup problems, and has the advantages of strong mass and heat transfer capabilities, low pressure drop, and narrow residence time distribution.

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Abstract

The invention discloses a carbon dioxide assisted dehydrogenation catalyst and a preparation method thereof, the catalyst comprises a honeycomb matrix, a modified silicon-aluminum coating on the surface of the honeycomb matrix and a first active component Pt, and the coating contains VIB group metal carbide; in an XRD (X-Ray Diffraction) spectrogram, lattice shift occurs on characteristic peaks representing VIB group metal carbides at positions of 36 degrees, 42 degrees, 61 degrees and 74 degrees. The preparation method comprises the following steps: (1) dissolving a group VIB metal precursor and / or an auxiliary metal salt in water to obtain a solution A; (2) mixing alumina powder, pseudo-boehmite, a surfactant, a silicon source and the solution A to obtain slurry; (3) loading the honeycomb substrate with the slurry, drying and roasting to obtain a carrier; and (4) loading Pt on the carrier to obtain the catalyst. The double active centers in the catalyst cooperate with each other, so that the catalyst has double functions of activating carbon dioxide and dissociating and adsorbing alkane, and has a wide application prospect in the fields of selective oxidation, oxidative dehydrogenation and the like.
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