Dehydrogenation catalyst and method for preparing same

Abstract

The invention discloses a dehydrogenation catalyst, which comprises a carrier, and an active component and an accessory ingredient which are carried on the carrier, wherein the carrier is Al2O3; the active component is a noble metal Pd; the accessory ingredient is a metal accessory ingredient which is the mixture of any two or more than three of Ni, Fe, Ba, Ce, La, Sm or Pr; the load of the noble metal Pd is 0.25 to 1.0 weight percent; and the ratio of the amount of the noble metal Pd to the total amount of metallic substances in the metal accessory ingredient is 0.3-1.5:1. The invention also discloses a method for preparing the dehydrogenation catalyst and an oxyhydrogen complex reaction applied to a dehydrogenation process in an environment with little hydrogen. The dehydrogenation catalyst has the following advantages that: due to the adoption of special preparation technology, the obtained dehydrogenation catalyst of the invention has the characteristics of high dispersity, high low-temperature activity, high poison resistance, high moisture resistance and the like; and as the load of the heavy metal Pd is only 0.25 to 1.0 weight percent, high activity and low cost are achieved.

Description

(1) Technical field [0001] The invention relates to a hydrogen-removing catalyst used in a hydrogen-containing environment and a preparation method thereof. The working principle is to eliminate trace amounts of hydrogen in the environment by catalyzing hydrogen-oxygen recombination into water. (2) Background technology [0002] With the widespread use of organic hydrogenation synthesis processes, there are more and more micro-hydrogen environments. Such as various hydrogen laboratories; during the charging and discharging process of lead-acid batteries, part of the water is decomposed to produce hydrogen; in nuclear submarines, the water electrolysis oxygen generator is used to produce oxygen for the submarine crew to breathe, and the hydrogen is discharged out of the boat; nuclear power plant containment Inside, hydrogen gas is also produced due to the reaction of high-temperature metals with water. All these places where hydrogen is used and where traces of hydrogen are ...

AI Technical Summary

Problems solved by technology

[0003] It is the most effective and convenient method to remove hydrogen by catalytically combining hydrogen and oxygen into water. In order to ensure its high efficiency, catalysts with noble metals Pt and Pd are generally used as the main active components. However, in order to ensure the high efficiency, long life and low cost of the catalyst, Still need to solve the following problems from the prior art: 1, because the hydrogen-oxygen recombination reaction is a gas-solid heterogeneous catalytic reaction, in order to keep the activity of the catalyst, the surface of the catalyst cannot be wetted by liquid water (i.e. wet water problem), while the product of the reaction is It is water, so how to control the temperature of the reaction system is extremely critical, neither too high nor too low. Proper reaction temperature control can make the product water leave the reaction system in gaseous form to ensure the effective operation of the catalyst

[0004] Existing hydrogen elimination catalysts have patent reports (US4459270, CN1040156A, etc.), but generally all use two kinds of noble metals, Pt and Pd, as the main agent, and due to the limitation of its preparation method, there is not high dispersion and the amount of noble metals (≥ 1wt %) are larger and more costly, and do not fully address the wet water problem