Homogeneous mesoporous rhodium oxide / alumina composite catalysis material, preparation method and application thereof

Abstract

A preparation method of a homogeneous mesoporous rhodium oxide / alumina composite catalysis material of the invention comprises the following steps: (1) stirring a template and aluminum salt in absolute ethyl alcohol to obtain a homogeneous alumina sol; (2) dissolving rhodium salt in deionized water to prepare a solution, adding the solution into the alumina sol and carrying out ultrasonic disperse to obtain a rhodium oxide / alumina composite sol; (3) stirring the composite sol at room temperature and volatilizing solvent to obtain a rhodium oxide / alumina composite gel; (4) calcining the composite gel under 400-600 DEG C and removing the template to obtain the homogeneous mesoporous rhodium oxide / alumina composite catalysis material. The composite catalysis material can be applied to preparation of a methane catalysis combustion sensor and has beneficial effects of high specific surface area, loosening porous structure and capability of enhancing catalytic activity of a catalyst; the methane catalysis combustion sensor has characteristics of micromation, low power dissipation, short response time, high output signal, large signal to noise ratio, portability and convenience, etc.

Description

technical field [0001] The invention relates to the technical field of inorganic material synthesis and sensors, in particular to a homogeneous mesoporous rhodium oxide / alumina composite catalytic material, a preparation method thereof, and an application of the material to a MEMS methane catalytic combustion sensor. Background technique [0002] Mesoporous materials have the advantages of regular and orderly arrangement of pores, adjustable pore size and extremely narrow distribution range, and easy chemical modification of the surface. Adsorption, separation, and catalytic reactions are possible. In the field of mesoporous catalysis, non-silicon mesoporous materials are often those that can really play a catalytic role or have a synergistic effect with supported catalysts. Therefore, the research on non-silicon-based mesoporous materials has become a new subject in recent years, and has become a hot spot in the field of new material research. However, the synthesis of no...

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Problems solved by technology

[0006] The first defect is: the mechanical strength of the catalytic element of the sensor is not very good, and the catalytic activity will decay after long-term use

Because the Pt wire used for winding the wire is very thin, and it is often in a state of cold and hot cycles (due to different gas concentrations, the heat released by catalytic combustion will change, and the heat loss will also be different due to different gas flow rates), and The frequent vibration and collision in the industrial environment can easily cause the broken wire of the catalytic element of the sensor, resulting in the failure of the element

In addition, the working temperature of the catalyst is above 500 degrees Celsius, and the attenuation of the activity of the catalytic element of the sensor after long-term use is inevitable

[0007] The second disadvantage is: the high power consumption of the catalytic element of the sensor

However, the heating area of ​​this micro heater is very small, usually 0.01mm 2 It is only about 1% of the size of the traditional catalytic combustion element. Therefore, the amount of catalyst loaded by it is very small. As a result, the signal strength generated by the catalytic combustion of methane during the measurement process is weak and the signal-to-noise ratio is small, which is difficult to be practical. application and other issues

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