Bimetallic nanoparticles usually have more excellent catalytic, optical and electrical properties than that of corresponding monometallic nanoparticles. Co-reduction, successive reduction, galvanic replacement reaction, chemical vapor deposition, microemulsion and microwave assisted heating method are widely used for the preparation of bimetallic nanoparticles. Alloy, core@shell and hollow-structured bimetallic nanocatalysts with controllable structure and uniform particle size that prepared under mild conditions via galvanic reaction, usually possess highly catalytic activities. Recently development of bimetallic nanoparticles prepared by galvanic replacement reactions with structure of alloy, core@shell and hollow are introduced in present paper, and the effects of preparation condition such as the kind and composition of template nanoparticles, protective agents, reaction medium, reaction time and temperature, precursor concentration on the structure, and the catalytic activity of the as-prepared bimetallic nanoparticles are reviewed in detail. The present problems and potential development directions on bimetallic nanocatalysts with different structures synthesized by replacement reaction are also proposed.

Contents
1 Introduction
1.1 Application and structure of bimetallic nanocatalysts
1.2 Synthesis methods of bimetallic nanocatalysts
1.3 Galvanic replacement reaction
2 Alloy-structured bimetallic nanocatalysts prepared by replacement reaction
2.1 Catalytic property of alloy-structured bimetallic nanocatalysts
2.2 Formation mechanism of alloyed bimetallic nanocatalysts prepared by replacement reaction
2.3 Control synthesis of alloyed bimetallic nanocatalysts by replacement reaction
3 Core@shell-structured bimetallic nanocatalysts prepared by replacement reaction
3.1 Catalytic property of core@shell-structured bimetallic nanocatalysts
3.2 Formation mechanism of core@shell nanocatalysts prepared by replacement reaction
3.3 Control synthesis of core@shell nanocatalysts by replacement reaction
4 Hollow-structured bimetallic nanocatalysts prepared by replacement reaction
4.1 Catalytic property of hollow-structured bimetallic nanocatalysts
4.2 Formation mechanism of hollow nanocatalysts prepared by replacement reaction
4.3 Control synthesis of hollow nanocatalysts by replacement reaction
5 Conclusion and outlook