Method for preparing titanium dioxide catalyst with selectively deposited platinoid alloy granule

Abstract

The invention belongs to the technical field of materials and environments, and discloses a method for preparing a titanium dioxide catalyst with selectively deposited platinoid alloy granules. The method comprises the following steps: by adopting HF (Hydrofluoric Acid) as an end-capping reagent, preparing {101} and {001} double-crystal surface exposed titanium dioxide crystal powder by using a solvent thermal method; putting the titanium dioxide crystal powder into a 0-10mol / L sodium hydroxide solution, stirring for 0-5 hours, and performing centrifugal separation and water washing drying on solid substances in the solution so as to obtain light blue powder; dispersing the light blue powder, copper nitrate and chloroplatinic acid powder in deionized water so as to obtain a mixed liquid, stirring the mixed liquid for 12 hours at a temperature of 80 DEG C, and performing evaporation drying till black powder is prepared; calcining the black powder in an air environment, and calcining in hydrogen flow, so as to obtain the titanium dioxide catalyst with the selectively deposited platinoid alloy granules.

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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