Metal-semiconductor composite photocatalyst for photocatalytic synthesis for preparing ammonia gas from nitrogen and hydrogen, and preparation method and applications thereof

Abstract

The invention discloses a high efficient metal-semiconductor composite photocatalyst for photocatalytic synthesis for preparing ammonia gas from nitrogen and hydrogen, and a preparation method and applications thereof, and belongs to the technical field of catalysis of ammonia synthesis. Super para-magnetic dual-metal (iron-platinum, iron-palladium, iron-gold, or iron-nickel) nano clusters are loaded on semiconductor nitrides, semiconductor oxides, and semiconductor silicon (g-C3N4, ZnO, MoO2, or Si) to obtain the composite photocatalyst with high catalytic activity. The photocatalytic can catalyze synthesis of ammonia namely reactions between N2 and H2 at a room temperature under a normal pressure in the presence of light. The provided novel photocatalyst can be used to replace a conventional catalyst, NH3 can be synthesized from N2 and H2 under milder conditions, the NH3 synthesis cost is reduced, and thus the energy consumption and environmental pollution are effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of ammonia synthesis catalysis, and in particular relates to a metal-semiconductor composite photocatalyst capable of highly efficient photocatalysis for synthesis of ammonia from nitrogen and hydrogen, a preparation method and an application thereof. Background technique [0002] Nitrogen is an essential element in living organisms and widely exists in proteins and nucleic acids. Although the atmosphere contains a large amount of nitrogen (N 2 ), but since N 2 Has a strong non-polar nitrogen-nitrogen covalent bond, resulting in N 2 In fact, it is difficult to be directly applied. Even today, effectively fixing N 2 Still a challenge. Ammonia is an important chemical and energy raw material, which has been widely used. The use of nitrogen in the air to synthesize ammonia is known as the greatest scientific progress of the century. At present, the most important way to synthesize ammonia is the Haber-Bo...

AI Technical Summary

Problems solved by technology

In addition, another key issue in photocatalytic ammonia synthesis is from photocatalyst to N 2 Inefficient interfacial electron transfer between molecules is not conducive to improving the efficiency of ammonia synthesis

Therefore, it is necessary to scientifically and rationally design catalysts to achieve efficient photocatalytic N 2 Ammonia synthesis to solve photocatalytic N 2 The inefficiency of ammonia synthesis

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