Transition metal oxide/silicon dioxide nano composite powder body catalyst, its synthesis method and carbon nano tube prepared by using said catalyst

Abstract

The present invention relates to a method for synthesizing transition metal oxide / silicon dioxide nano composite powder catalyst. Said invention adopts precursor hydrothermal method to make synthesis, and said catalyst can be used for preparing carbon nano tube, and said method includes the following steps: placing the catalyst into the catalytic bed quartz tube, heating to 500-600 deg.C under the condition of inert gas atmosphere, introducing hydrogen gas and reducing for 0.4-1.5 hr, when the temp. is reached to 630-780 deg.C, introducing acetylene and hydrogen gas whose volume ratio is 9:1-1:1 in the flowing rate of 40-200 ml / min to make it prduce cracking reaction to synthesize carbon nano tube, its reaction time is 0.5-1.0 hr.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and more specifically relates to a transition metal oxide / silicon dioxide nanocomposite powder catalyst and a synthesis method thereof, as well as a method for the catalyst to prepare carbon nanotubes. Background technique [0002] Carbon nanotubes have been recognized internationally as a new type of functional material and structural material with excellent performance, which can be used as high-density hydrogen storage materials, high-strength composite materials, high-definition flat panel displays, nano-devices and new electromagnetic wave-absorbing materials Wait. At present, there are mainly three methods for preparing carbon nanotubes: catalytic cracking method, arc method and laser evaporation method. The preparation of carbon nanotubes by catalytic cracking usually requires the use of transition metals (Ni, Co, Fe) or their compounds as catalysts. The effective dispers...

AI Technical Summary

Problems solved by technology

The preparation of carbon nanotubes by catalytic cracking usually requires the use of transition metals (Ni, Co, Fe) or their compounds as catalysts. The effective dispersion and size of catalyst particles are one of the key factors for the synthesis of carbon nanotubes. Currently, the commonly used sol - The catalyst powder synthesized by the gel atmospheric pressure drying method has poor dispersibility, large and uneven particle size, and the resulting carbon nanotubes have a low yield, large diameter, and wide distribution range, etc.