Ammonia synthetic catalyst and method for making the same

Abstract

The present invention relates to catalyst, and is especially new ammonia synthesizing catalyst, which has noble metal Ru as active component, fluoride of alkali metal or alkali earth metal as assistant and magnesia as carrier and has high activity, and its preparation process. The catalyst has Ru / MgO ratio of 3-8 % and molar Ru / MFx of 0.5-8, the solvent adopted is water or organic solvent capable of dissolving RuCl3.nH2O or carbonyl ruthenium. The catalyst is prepared via soaking process or mechanically mixing, calcination and soaking process. It is used mainly in catalyzing the synthesis of ammonia with nitrogen and hydrogen. The greater electronegativity of F in fluoride may accelerate the hydrogenation of N to synthesize ammonia, and the catalyst has activity 1-3 times that of catalyst with oxide rather than fluoride and has the lower use temperature and pressure of ammonia synthesizing Ru catalyst maintained.

Description

(1) Technical field [0001] The invention relates to an ammonia synthesis catalyst, in particular to a novel highly active ammonia synthesis catalyst which uses noble metal ruthenium as an active component, alkali metal or alkaline earth metal fluoride as an auxiliary agent, and magnesium oxide as a carrier and a preparation method thereof. (2) Background technology [0002] Ammonia synthesis catalyst is the most important catalyst in the ammonia synthesis industry, which directly affects the economic benefits of ammonia synthesis and the production process of ammonia synthesis. The traditional ammonia synthesis catalyst is a molten iron catalyst, which is relatively mature in technology, but its operating pressure and temperature are relatively high. It not only requires high equipment, but also requires high energy consumption in the process. Therefore, finding a low-temperature, low-pressure and high-activity ammonia synthesis catalyst has become the direction and goal of ...

AI Technical Summary

Problems solved by technology

However, most of the ruthenium-based ammonia synthesis catalysts are based on carbon, which involves issues such as the stability of the catalyst in the production process.