沸石基氨氣傳感器的性能研究
發(fā)布時間：2018-09-12 06:02
【摘要】：近年來,沸石在氣體傳感器領域得到了越來越多的關注。由于沸石的多孔性和離子交換性能,使其在提高氣體傳感器的靈敏度和選擇性方面具有獨特的優(yōu)勢。本文嘗試將沸石材料作為阻抗型氨氣傳感器的功能材料,探索其氣敏性能。首先,采用水熱法合成方法A型和Y型沸石粉末,并對Y型沸石粉末進行不同溫度的燒結處理,通過對燒結后Y型沸石粉末的XRD測試結果進行分析,判定Y型沸石粉末作為功能材料的最佳燒結溫度為600℃。其次,采用Y型沸石粉末為功能材料,用銀漿作電極以絲網(wǎng)印刷工藝制備出電容式結構的沸石基阻抗型氨氣傳感器。為使得傳感器獲得最大的響應值,本文以Na-Y型沸石基傳感器為例,給傳感器加上六種不同的激勵頻率,測試其分別對100 ppm NH3的響應,并測試其在不同濃度氨氣下響應的阻抗譜。測試結果表明:傳感器的激勵頻率為3 k Hz時,傳感器對氨氣有良好的響應,因此后續(xù)實驗均采取3 k Hz作為傳感器的最佳激勵頻率。此外,在150~250℃的工作溫度,一定氣氛條件下,測試該傳感器對NH3氣體的響應特性,測試結果顯示:Na-Y型沸石基傳感器對100 ppm NH3的響應值達36.2%,且傳感器最佳工作溫度為200℃。第三,本文采用液相離子交換法對Na-Y型沸石中Na+進行離子交換,交換的元素分別為質(zhì)子H+,堿金屬元素Li+,稀土元素La3+,貴金屬元素Pd2+和Ag+,采用每一種元素可溶性的鹽溶液。將不同離子交換制備成傳感器,在相同的測試條件下,對其進行上述各項測試,并與Na-Y型沸石基傳感器的性能作對比。結果顯示:使用Ni+、La3+以及Ag+交換制備的傳感器的響應性能均有所提高,但對于H+和Pd2+交換制備的傳感器的響應值卻不及Na-Y型沸石基傳感器。同時,對Ag-Y型沸石基傳感器進行選擇性測試以及對O2的抗干擾能力測試,實驗結果表明:傳感器對CO2與CO存在良好的選擇性,對不同體積分數(shù)的O2對傳感器無影響,但C3H6與NO對傳感器存在微弱影響。第四,改變傳感器的厚度探究改進后的傳感器對氨氣的響應,并設計出不同厚度的傳感器厚度。將不同厚度的Ag-Y型沸石基傳感器,在相同的測試條件下,對其進行上述各項性能測試。研究結果表明:隨著沸石基傳感器的厚度增加,傳感器對氨氣響應程度也隨之增加。最后,本文嘗試使用A型沸石與ZSM-5型沸石代替Y型沸石,制備了相同結構的電容式沸石基傳感器,同時用相同濃度的Ag NO3溶液使用離子交換法對A型沸石與ZSM-5型沸石中的陽離子進行置換,制備出Ag-A型沸石基傳感器與Ag-ZSM-5型沸石基傳感器,探索研究改進后傳感器對NH3氣體的響應特性。結果顯示:Na-A型與Ag-A型沸石基傳感器對氨氣不響應,H-ZSM-5型與Ag-ZSM-5型沸石基傳感器對氨氣均有一定響應,且前者響應大于后者�？傊�,本文系統(tǒng)研究了用于檢測氨氣的沸石基傳感器的一些性能,重點探究了Y型沸石基氨氣傳感器的性能。實驗結果表明:可以使用Ag-Y型沸石基傳感器對檢測氨氣具有良好效果。
[Abstract]:In recent years, zeolite has attracted more and more attention in the field of gas sensors. Because of its porous and ion exchange properties, zeolite has unique advantages in improving the sensitivity and selectivity of gas sensors. Firstly, zeolite A and zeolite Y powders were synthesized by hydrothermal method, and the zeolite Y powders were sintered at different temperatures. By analyzing the XRD results of the sintered zeolite Y powders, the optimum sintering temperature of zeolite Y powders as functional materials was determined to be 600 C. Secondly, zeolite Y powders were used as functional materials and silver was used as functional materials. Zeolite-based impedance ammonia sensor with capacitive structure was fabricated by screen printing with slurry as electrode. In order to maximize the response of the sensor, the Na-Y zeolite-based sensor was used as an example. Six different excitation frequencies were added to the sensor to test its response to 100 ppm NH3, and its response to different concentrations of ammonia was tested. The results show that the sensor has a good response to ammonia when the excitation frequency of the sensor is 3 K Hz. Therefore, the optimal excitation frequency of the sensor is 3 K Hz in the following experiments. In addition, the response characteristics of the sensor to NH3 gas are tested at the operating temperature of 150-250 C and under certain ambient conditions. The results show that the response value of the Na-Y zeolite-based sensor to 100 ppm NH3 is 36.2%, and the optimum working temperature of the sensor is 200 C. Thirdly, the ion exchange of Na + in Na-Y zeolite is carried out by liquid-phase ion exchange method. The exchanged elements are proton H +, alkali metal element Li +, rare earth element La3 +, precious metal element Pd2 + and Ag +, and each of them is used. Soluble salt solution of elements. Sensors prepared by different ion exchanges were tested under the same test conditions and compared with Na-Y zeolite-based sensors. The results showed that the response of sensors prepared by Ni+, La3+ and Ag+ exchanges was improved, but for H + and Pd2+ exchanges, the performance of sensors was improved. At the same time, the selectivity of Ag-Y zeolite-based sensor and the anti-interference ability of O2 were tested. The results showed that the sensor had good selectivity to CO2 and CO, and had no effect on the sensor with different volume fraction of O2, but C3H6 and NO had weak effect on the sensor. Fourth, change the thickness of the sensor to explore the response of the improved sensor to ammonia, and design different thickness of the sensor. Different thickness of Ag-Y zeolite-based sensors, under the same test conditions, to carry out the above performance tests. The results show that: with the increase of the thickness of the zeolite-based sensor, transmission. Finally, the capacitive zeolite-based sensor with the same structure was prepared by using zeolite A and zeolite ZSM-5 instead of zeolite Y. At the same time, the cations in zeolite A and zeolite ZSM-5 were replaced by ion exchange method in the same concentration of Ag-NO3 solution. The results show that the Na-A and Ag-A zeolite-based sensors are not responsive to ammonia, and the H-ZSM-5 and Ag-ZSM-5 zeolite-based sensors have certain responses to ammonia, and the former is more responsive than the latter. Some properties of zeolite-based ammonia sensor used for detecting ammonia are studied, especially the performance of Y-type zeolite-based ammonia sensor. The experimental results show that the Ag-Y type zeolite-based ammonia sensor can be used to detect ammonia with good results.
【學位授予單位】：寧波大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TP212
本文編號：2238122
[Abstract]:In recent years, zeolite has attracted more and more attention in the field of gas sensors. Because of its porous and ion exchange properties, zeolite has unique advantages in improving the sensitivity and selectivity of gas sensors. Firstly, zeolite A and zeolite Y powders were synthesized by hydrothermal method, and the zeolite Y powders were sintered at different temperatures. By analyzing the XRD results of the sintered zeolite Y powders, the optimum sintering temperature of zeolite Y powders as functional materials was determined to be 600 C. Secondly, zeolite Y powders were used as functional materials and silver was used as functional materials. Zeolite-based impedance ammonia sensor with capacitive structure was fabricated by screen printing with slurry as electrode. In order to maximize the response of the sensor, the Na-Y zeolite-based sensor was used as an example. Six different excitation frequencies were added to the sensor to test its response to 100 ppm NH3, and its response to different concentrations of ammonia was tested. The results show that the sensor has a good response to ammonia when the excitation frequency of the sensor is 3 K Hz. Therefore, the optimal excitation frequency of the sensor is 3 K Hz in the following experiments. In addition, the response characteristics of the sensor to NH3 gas are tested at the operating temperature of 150-250 C and under certain ambient conditions. The results show that the response value of the Na-Y zeolite-based sensor to 100 ppm NH3 is 36.2%, and the optimum working temperature of the sensor is 200 C. Thirdly, the ion exchange of Na + in Na-Y zeolite is carried out by liquid-phase ion exchange method. The exchanged elements are proton H +, alkali metal element Li +, rare earth element La3 +, precious metal element Pd2 + and Ag +, and each of them is used. Soluble salt solution of elements. Sensors prepared by different ion exchanges were tested under the same test conditions and compared with Na-Y zeolite-based sensors. The results showed that the response of sensors prepared by Ni+, La3+ and Ag+ exchanges was improved, but for H + and Pd2+ exchanges, the performance of sensors was improved. At the same time, the selectivity of Ag-Y zeolite-based sensor and the anti-interference ability of O2 were tested. The results showed that the sensor had good selectivity to CO2 and CO, and had no effect on the sensor with different volume fraction of O2, but C3H6 and NO had weak effect on the sensor. Fourth, change the thickness of the sensor to explore the response of the improved sensor to ammonia, and design different thickness of the sensor. Different thickness of Ag-Y zeolite-based sensors, under the same test conditions, to carry out the above performance tests. The results show that: with the increase of the thickness of the zeolite-based sensor, transmission. Finally, the capacitive zeolite-based sensor with the same structure was prepared by using zeolite A and zeolite ZSM-5 instead of zeolite Y. At the same time, the cations in zeolite A and zeolite ZSM-5 were replaced by ion exchange method in the same concentration of Ag-NO3 solution. The results show that the Na-A and Ag-A zeolite-based sensors are not responsive to ammonia, and the H-ZSM-5 and Ag-ZSM-5 zeolite-based sensors have certain responses to ammonia, and the former is more responsive than the latter. Some properties of zeolite-based ammonia sensor used for detecting ammonia are studied, especially the performance of Y-type zeolite-based ammonia sensor. The experimental results show that the Ag-Y type zeolite-based ammonia sensor can be used to detect ammonia with good results.
【學位授予單位】：寧波大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TP212
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