Carrier type platinum-ruthenium catalyst and application to hydrogenation of halide-containing nitro compound

Abstract

The invention discloses a carrier type platinum-ruthenium catalyst. Platinum and ruthenium in the catalyst are loaded on a same carrier, the mass ratio of the platinum to the ruthenium in the catalyst is 1: (0.01-5), and the total mass of the platinum and the ruthenium in the catalyst is 0.1-20% of the total mass of the catalyst. The invention further provides an application of the carrier type platinum-ruthenium catalyst to a selective hydrogenation method of a halide-containing nitro compound. The active component platinum and the active component ruthenium are loaded on the same carrier, so that activity of the catalyst is improved; and when the catalyst is applied to the selective hydrogenation reaction of the halide-containing nitro compound, other auxiliaries are not required to be added, reaction speeds can be greatly accelerated, and high conversion rates and high selectivity of the reaction can be kept under low temperatures and low pressure.

Description

technical field [0001] The invention relates to a carrier-type catalyst, in particular to a carrier-type platinum-ruthenium catalyst and its application in hydrogenation of halogen-containing nitro compounds. Background technique [0002] Amine compounds and their derivatives are widely used in chemical industry, medicine, dyes, pesticides and other fields, and most of the amine compounds and their derivatives are derived from the reduction of corresponding nitro compounds. [0003] The reduction of nitro compounds to amine compounds mainly includes classical chemical reduction method, electrolytic reduction method, CO / H 2 O system reduction method and selective catalytic hydrogenation reduction method. [0004] Classical chemical reduction methods mainly include iron powder method, formaldehyde method, soda sulfide method, hydrazine hydrate method, etc. These methods have a long process flow, a lot of three wastes, and great environmental pollution. It is necessary to find...

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Problems solved by technology

[0009] (2) Selectivity is poor, product yield is low, and reaction temperature is high

The reaction temperature using Raney nickel catalyst is usually higher than 100°C, and amino compounds are easy to generate tar above 100°C, which affects the yield and the normal progress of the reaction

[0010] (3) Catalyst consumption is large

Due to the low activity of the Raney nickel catalyst, a large amount of catalyst needs to be added in the reaction. In addition, the recovery of the catalyst is difficult, which increases the consumption of the catalyst and increases the production cost.

[0011] (4) There are potential safety hazards in production

For example, the addition of dehalogenation inhibitors will cause the inhibitors to remain in the product, increasing the production process and production costs; adding other metal components does not improve the selectivity of the single platinum catalyst, or affects the catalyst activity, so that the reaction speed is greatly reduced. Slow; improving the preparation method basically improves the reaction selectivity by reducing the activity of the catalyst and slowing down the reaction speed, but the reduction in activity increases the amount of the catalyst, greatly increasing the production cost, and the reaction conditions are not improved at the same time; using a homogeneous catalyst, At present, the yield and selectivity are not as good as those of platinum-supported catalysts, and at the same time, it has the disadvantage of difficulty in recovery and application

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