Preparation method of titanium dioxide catalyst selectively deposited with platinum-copper alloy particles

Abstract

The invention belongs to the technical field related to materials and environment. It discloses a method for preparing a titanium dioxide catalyst with platinum-copper alloy particles selectively deposited, which includes the following steps: using HF acid as an end-capping agent, and preparing {101 by a solvothermal method. } and {001} twin crystal faces expose the titanium dioxide crystal powder; the titanium dioxide nanocrystal powder is placed in a sodium hydroxide solution with a concentration of 0 to 10 mol / L and stirred for 0 to 5 hours, and then the solid matter in the solution is centrifuged Separate, wash and dry to obtain light blue powder; disperse the light blue powder, copper nitrate, and chloroplatinic acid powder in deionized water to obtain a mixed solution, and then stir the mixed solution at 80°C for 12 hours. The mixture is evaporated to dryness to obtain black powder; the black powder is calcined in an air environment and then calcined in a hydrogen flow to obtain a titanium dioxide catalyst with platinum-copper alloy particles selectively deposited on the crystal surface.

Description

technical field [0001] The invention belongs to the technical field related to materials and the environment, and more specifically relates to a method for preparing a titanium dioxide catalyst selectively deposited with platinum-copper alloy particles. Background technique [0002] The greenhouse effect caused by the emission of a large amount of greenhouse gases such as CO2, CH4, etc. has become a global focus. In recent years, the increase of CO2 concentration in the atmosphere due to human production activities has accelerated the greenhouse effect. How to effectively control CO2 emissions has become a top priority for all countries. Among them, using photocatalytic reduction technology to convert CO2 into methane, carbon monoxide, methanol and other organic substances is an effective method to reduce CO2 emissions. The above methods play an important role in reducing CO2 emissions. At the same time, it also realizes the resource utilization of CO2. Photocatalytic redu...

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Problems solved by technology

[0003] Titanium dioxide has become the most widely used photocatalyst due to its strong photocatalytic oxidation ability, light corrosion resistance, low cost, and non-toxicity. However, the photocatalytic reduction of CO2 by titanium dioxide still has the problems of low conversion efficiency and poor product selectivity.

[0004] At present, those skilled in the art have done some research. For example, the patent application number 201110184138.8 discloses a method for preparing a carbon-doped titania-supported platinum-copper alloy catalyst. The method utilizes ultrasonic dispersion to support the platinum-copper alloy catalyst on carbon-doped titania; however, this method cannot control the selective deposition of platinum-copper alloy particles on different crystal faces of titania

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