A kind of relatively stable propane dehydrogenation propylene catalyst and preparation method thereof

Abstract

A relatively stable catalyst for propane catalytic dehydrogenation to propylene, with composite oxide alumina-chromium oxide as composite support, metal Pt as active component, metal Sn, La and Y as additives, and its chemical formula is Pt ‑Sn‑La‑Y / Cr2O3·Al2O3, the mass ratio of Cr2O3 and Al2O3 in the composite carrier is 2:1, the loading amount of the promoter in the catalyst: Pt is 0.2‑1.0wt%, Sn is 0.4‑1.5wt%, La is 0-1.4 wt%, and Y is 0.2-1.2 wt%. The invention has the advantages that: the preparation method is simple in process and easy to implement, the prepared catalyst has higher propane conversion rate, higher activity and longer service life, and the stability of the catalyst is obviously improved; the selectivity of propylene is higher, The catalyst has a small deactivation coefficient, has significant economic and technical effects, and is beneficial to industrial promotion.

Description

technical field [0001] The invention relates to a preparation technology for propane dehydrogenation to propylene, in particular to a relatively stable catalyst for propane catalytic dehydrogenation to propylene and a preparation method thereof. Background technique [0002] As an important chemical raw material, propylene is widely used in the production of polypropylene, acrylic acid and butanol and octanol. However, propylene supply growth has lagged behind demand growth, with propylene production accounting for only about 70% of equivalent demand. In 2007, my country's annual output of propane was 8.166 million tons. In 2013, the output increased to 20.28 million tons, a 1.5-fold increase. Even so, the supply and demand of propylene is still in short supply. Traditional propylene production technologies such as catalytic cracking and ethylene co-production have been difficult to meet the imbalance between supply and demand of propylene, and the development and applicati...

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Problems solved by technology

[0004] In short, the catalytic dehydrogenation of propane to propylene will play an increasingly important role in solving the problem of unbalanced supply and demand of propylene, but its defects are also obvious. High-temperature reactions cause the catalyst to be prone to carbon deposition, deactivation, etc., and further research and development is required to stabilize the properties. , a catalyst with high activity and high conversion

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