CNT (carbon nano tube) loaded Pt-HxMoO3 catalyst, preparation method and application thereof

Abstract

The invention discloses a CNT (carbon nano tube) loaded Pt-HxMoO3 catalyst, a preparation method and application thereof. The preparation method comprises the following steps: adding soluble Pt metallic compounds into carbon nano tubes dispersed in water, carrying out ultrasonic dispersion on the Pt metallic compounds, stirring and drying the Pt metallic compounds to obtain dry powder; dispersing the dry powder into NaBH4-containing solution of glycol, performing a reaction with stirring, and filtering, washing and drying the mixture to obtain CNT (carbon nano tube) loaded Pt powder; dripping solution of HCl into solution of ammonium molybdate to obtain H2MoO4 hydrosol, and adding zinc sheets into the H2MoO4 hydrosol to obtain HxMoO3 hydrosol; and dispersing the CNT (carbon nano tube) loaded Pt powder into the HxMoO3 hydrosol, carrying out ultrasonic treatment on the mixture, filtering, washing and drying the mixture to obtain the CNT (carbon nano tube) loaded Pt-HxMoO3 catalyst with good methanol catalytic oxidation capacity and anti-poisoning capacity. The preparation method has the advantages of simple raw materials and equipment and low cost; and the obtained catalyst can be used for direct methanol fuel cells.

Description

technical field [0001] The invention particularly relates to a carbon nanotube loaded Pt-H x MoO 3 The catalyst, its preparation method and application belong to the technical field of catalyst manufacture. Background technique [0002] Direct methanol fuel cell (DMFC) directly uses methanol as fuel without reforming to obtain hydrogen-rich fuel gas. Methanol has the advantages of abundant sources, cheap price, low toxicity, easy to carry and store, and high energy density. However, the low catalytic activity of the anode catalyst of direct methanol fuel cells and the poisoning effect of methanol oxidation intermediates hinder the practical application of direct methanol fuel cells. Therefore, the development of anode catalysts with high catalytic activity and strong anti-poisoning ability is one of the problems that must be solved in the field of direct methanol fuel cells. [0003] So far, catalysts that can better adsorb and catalyze methanol oxidation at lower temper...

AI Technical Summary

Problems solved by technology

This catalyst is mainly prepared by impregnation reduction method and sol method: (1) impregnation reduction method is to disperse the carrier evenly in a certain solvent such as water, ethanol, isopropanol or a mixture thereof, and select a certain precious metal precursor such as Chloroplatinic acid (H 2 PtCl 6 ·H 2 O) or ruthenium trichloride (RuCl 3 ) impregnated into the pores of the carrier, adjusted to a suitable pH value, at a certain temperature with an excess reducing agent such as HCHO, NaBH 4 , ethylene glycol, H 2 etc. are reduced to obtain the required supported catalyst, but the catalyst prepared by this method may cause the particle size to be too large due to agglomeration, which reduces the catalyst performance (NaBH 4 and other solutions are reducing agents), or because the reaction temperature is too high, the danger increases (H 2 (2) the colloid method is to prepare the noble metal precursor of the catalyst as a metal colloid in a specific solvent, then adsorb or deposit it on the carrier, or form a specific noble metal oxide colloid, then reduce and At the same time, it is adsorbed on the carrier to prepare a carrier-metal catalyst. However, this method is complicated to operate and the reaction conditions are relatively harsh. Usually, it is necessary to install a reflux device and pass N 2 protection, the reaction temperature is above 130°C

It can be seen that the current anode catalysts for direct methanol fuel cells still have safety issues, cost issues, and catalytic activity issues.

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