| abstract |
The invention discloses a method for preparing cyclohexanecarboxylic acid by catalyzing the hydrogenation of benzoic acid in a fixed bed. The catalytic hydrogenation reaction is carried out in a fixed bed reactor. The main active component is precious metal Ru, and the auxiliary agent is any one of Na, K, Mn, Fe, Co, Ni, Cu, Mg, Ba and Zn. By adding additives such as alkali metals or transition metals to the catalyst of the present invention, the loading of precious metal Ru is not only reduced, but also the bimetal synergy greatly improves the activity and stability of the catalyst; after the support is doped with N, it can provide a site for anchoring the active metal , so that the active metal is highly dispersed and difficult to agglomerate; the catalyst can convert benzoic acid into cyclohexanecarboxylic acid with high activity, high selectivity and high stability under certain temperature and pressure, and the fixed bed reactor can realize continuous production. |