A low temperature catalytic-type combustible gas sensor based on Pt supported zeolite catalyst films
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A low temperature catalytic-type combustible gas sensor based on Pt supported zeolite catalyst films Pan Wang1,*
1
, Xuemin Tian1, Meng Yan1, Boxuan Yang1, and Zhongqiu Hua1
Tianjin Key Laboratory of Electronic Materials and Devices, School of Electronics and Information Engineering, Hebei University of Technology, Tianjin 300401, China
Received: 19 July 2020
ABSTRACT
Accepted: 10 November 2020
In this study, a catalytic-type combustible gas sensor was fabricated by the screen-printing method. Pt supported catalysts (Pt-HZSM5) were prepared by a wet impregnation method using HZSM5 zeolite as support. It was found that PtHZSM5 catalysts have a highly catalytic activity to H2 and CO at low temperatures and a selectively and fully combustible was observed at only 150 °C. A good dispersion state of Pt nanoparticles on HZSM5 zeolite particles was beneficial for the catalytic oxidization of CO and H2. However, a high loading amounts lead to a poor dispersion state and a weak catalytic activity. The thick film sensor based on Pt-HZSM5 catalyst was found to be highly sensitive to combustible gas with a good linearity up to 2% and a limitation of detection (LOD) around 50 ppm. Due to the low operation temperature, a highly selectivity was obtained for CO and H2 and no cross-sensitivity to interfering gases such as CH4 and VOCs. It was indicated that the present developed catalytictype gas sensors could be used for the leakage detection and monitor for H2 and CO with a low power consumption and a good selectivity.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
Introduction CO, H2, and methane are colorless, odorless, and flammable gases [1]. In particular, carbon monoxide (CO) is a highly toxic and non-irritating gas [2]. This is a serious threat to our lives. Therefore, combustible gas detection has an important significance. Nowadays, low temperature-operative gas sensor has
Handling Editor: Catalin Croitoru.
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https://doi.org/10.1007/s10853-020-05563-w
gained enormous attention such as semiconductor, electrochemical, and catalytic combustion-type sensor. Semiconductor and electrochemical sensors have been widely used in the detection of flammable gases [3]. However, catalytic sensors need to reduce power consumption as much as possible [3]. One of the common solutions is to reduce the chip size and the other is to develop low temperature catalytic sensitive materials [4]. In this case, the detection of
J Mater Sci
combustible gases H2 and CO by catalytic combustion sensors has attracted extensive attention. One important feature of catalytic type sensors are generally not susceptible to environmental temperature and humidity fluctuations, which is unavoidable in the environment [4]. Additionally, the catalytic device has a wide linearity and even up to 5% in volume. K. Fukui et. al., have fabricated catalytic sensors with SnO2 ceramics and silicon-containing zeolite coating for CO detection [5]. SnO2 is coated on the zeolite and the
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