TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Component: The superposed catalyst is nickel oxide/amorphous aluminum silicate-aluminum oxide catalyst. It contains 1-12% nickel oxide, 45-82% amorphous aluminum silicate, and 10-50% aluminum oxide.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: When the fixed bed catalytic hydrogenation reactor is a two-section hydrogenation reactor, the superposed catalyst is filled in the first section of hydrogenation reactor. The superposed catalyst is filled at the tail end of a reaction bed layer of the hydrogenation reactor. A superposed reactor is between the first section of hydrogenation reactor and a heat exchanger when the fixed bed catalytic hydrogenation reactor is a two-section hydrogenation reactor. The fixed bed catalytic hydrogenation reactor is a three-section hydrogenation reactor, the superposed reactor is singly or synchronously arranged after the first section of hydrogenation reactor or the second section of hydrogenation reactor. When the fixed bed catalytic hydrogenation reactor is a three-section hydrogenation reactor, the superposed catalyst is filled in the first section of hydrogenation reactor or the second section of hydrogenation reactor. The superposed catalyst is filled at the tail end of reaction bed layer of the hydrogenation reactor. The superposed reaction condition is at 65-130 degrees C, 1.5-2.5 MPa, and an airflow volume speed of 5000-40000-1. The inlet temperature of the fixed bed hydrogenation reactor is 20-80 degrees C. The reaction pressure is 1.5-2.5 MPa. The airflow volume speed is 2000-10000-1. The superposed catalyst is precursor with nickel nitrate as nickel oxide, which is dried and baked by leaching on amorphous aluminum silicate-aluminum oxide carrier that is obtained by doping the aluminum oxide powder with the amorphous aluminum silicate, extruding by adding adhesive, and baking at 400-600 degrees C for 3-6 hours. It is obtained by mixing, extruding, and molding amorphous silicon powder and aluminum oxide dry powder, drying for 2-4 hours at 100-150 degrees C, baking for 2-4 hours at 450-600 degrees C, and obtaining amorphous aluminum silicate-aluminum oxide carrier. Nickel salt is dissolved in deionized water, and leached for 0.2-1 hour. Drying is done for 2-4 hours at 100 -150 degrees C. Baking is conducted for 2-4 hours at 450-600 degrees C to obtain nickel oxide/amorphous aluminum silicate-aluminum oxide catalyst Preferred Component: The acetylene content in the inlet of the first section of hydrogenation reactor is 1-2.5%.