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 Pt-HZSM5 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 catalytic-type gas sensors could be used for the leakage detection and monitor for H2 and CO with a low power consumption and a good selectivity.

中文翻译：

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基于铂负载沸石催化剂薄膜的低温催化型可燃气体传感器

在这项研究中，通过丝网印刷方法制造了催化型可燃气体传感器。以 HZSM5 沸石为载体，通过湿浸渍法制备 Pt 负载型催化剂（Pt-HZSM5）。发现 Pt-HZSM5 催化剂在低温下对 H2 和 CO 具有高度催化活性，并且仅在 150 °C 下观察到选择性和完全可燃。Pt纳米颗粒在HZSM5沸石颗粒上的良好分散状态有利于CO和H2的催化氧化。然而，高负载量导致较差的分散状态和弱催化活性。发现基于 Pt-HZSM5 催化剂的厚膜传感器对可燃气体高度敏感，具有高达 2% 的良好线性和约 50 ppm 的检测限 (LOD)。由于工作温度低，获得了对 CO 和 H2 的高度选择性，并且对干扰气体（如 CH4 和 VOC）没有交叉敏感性。结果表明，目前研制的催化型气体传感器可用于氢气和一氧化碳的泄漏检测和监测，具有低功耗和良好的选择性。