A rare earth element-doped perovskite-type supported ruthenium ammonia synthesis catalyst

Abstract

The invention discloses a BaZrO3-δ-based perovskite-type supported ruthenium ammonia synthesis catalyst doped with rare earth elements and a preparation method thereof. The ruthenium-based ammonia synthesis catalyst is BaZrO3-δ-based perovskite doped with rare earth elements The type composite oxide is the carrier, the molecular formula is Ba1-xLnx+yZr1-yO3-δ, and metal ruthenium is the active component. The doping amount of rare earth elements is 1-20% of the total mass of the carrier, and the active component uses K2RuO4 as a precursor, which is directly impregnated into the carrier material, and the loading amount is 0.5%-10% of the weight of the carrier in terms of Ru. The preparation method of the invention is simple, the equipment is simple, no additives need to be added, the amount of noble metal is low, and the prepared catalyst has good activity at low temperature and low pressure and high stability.

Description

technical field [0001] The invention relates to a BaZrO doped with rare earth elements, which takes metal ruthenium as the active component 3-δ The invention discloses an ammonia synthesis catalyst and a preparation method of a perovskite-based carrier loaded with ruthenium, which belong to the technical field of fertilizer catalysts and are applied to the synthesis of ammonia from a mixture of hydrogen and nitrogen. Background technique [0002] The ruthenium-based ammonia synthesis catalyst is known as the second-generation ammonia synthesis catalyst after the molten iron catalyst, and has the characteristics of low temperature, low pressure and high activity. Among them, the ruthenium-based ammonia synthesis catalyst supported by graphitized activated carbon materials has achieved industrial application in the 1990s. Chinese patents CN101362080A and CN101053834A disclose an ammonia synthesis catalyst with ruthenium as an active component, activated carbon as a carrier, a...

AI Technical Summary

Problems solved by technology

However, the contact between carbon materials and ruthenium makes methanation reaction prone to occur under ammonia synthesis conditions, which reduces the stability and life of the catalyst, thus adversely affecting the industrial application of ruthenium catalysts.

Therefore, the preparation of highly active ruthenium-based ammonia synthesis catalysts using highly stable oxide materials instead of activated carbon as a carrier has become a research hotspot in this field; the common oxide carriers in the field of ruthenium-based ammonia synthesis catalysts are mainly Al 2 o 3 , MgO, rare earth oxides and other porous nanomaterials have low ammonia synthesis activity under low temperature and low pressure conditions, and have no industrial application value