纳米材料载体上的Pd催化剂对CH4传感器技术研究
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"Technology Research on CH4 Sensor with Pd Catalyst using Supported Nano-material Carrier of γ-Al2O3-ZrO2-ThO2"
本文主要探讨了一种使用Pd催化剂和纳米材料载体γ-Al2O3-ZrO2-ThO2的CH4传感器技术研究。在该研究中，科研人员通过原位生长法制备了Al2O3纳米多孔模板，并基于这些模板设计了一种由化学沉积法制得的γ-Al2O3-ZrO2-ThO2纳米材料载体。这种载体具有独特的结构特性，对提高Pd催化剂的催化氧化活性至关重要。
Pd催化剂因其在CH4（甲烷）氧化中的高效性能而被选中。通过将Pd均匀分散在γ-Al2O3-ZrO2-ThO2纳米材料载体上，研究人员成功地制造出了一种高活性的Pd催化剂。扫描电子显微镜（SEM）的分析结果显示，Pd催化剂在纳米材料载体中分布非常均匀，这有助于增强催化剂与甲烷分子的接触，从而提高传感器的检测性能。
利用这种Pd催化剂和纳米载体，科研人员构建了一款CH4传感器。实验结果证明，这款传感器表现出优异的活性和敏感性，能够有效地检测环境中甲烷的存在及其浓度变化。由于γ-Al2O3-ZrO2-ThO2纳米材料载体的特殊性质，如高的比表面积、良好的热稳定性和化学稳定性，以及Pd催化剂的高效氧化能力，使得这款传感器在实际应用中具有广阔前景，特别是在环境监测、工业安全和能源管理等领域。
此外，该研究还可能对其他类型的气体传感器设计产生影响，提供了一种优化催化剂分布和提升传感器性能的新方法。未来的研究可能会进一步探索不同金属催化剂和新型纳米材料载体的组合，以实现对更多种类气体的高效检测。
这项技术研究展示了纳米材料载体与高效催化剂结合在CH4传感器中的潜力，为开发更灵敏、更稳定的气体传感技术提供了新的思路。通过对材料科学和传感器技术的深入理解，可以预见这一领域的未来将会有更多的技术创新和突破。
Technology Research on CH
4
Sensor with Pd
Catalyst using Supported Nano-material Carrier of
γ-Al
2
O
3
-ZrO
2
-ThO
2
Hong-quan Zhang
1
, Kai Zhang
2
, Qing Zhang
1*
, and Ai-dong Liu
3*
1.College of Automation, Harbin Engineering University , China
2. Key Laboratory of In-Fiber Integrated Optics Ministry of Education, Harbin Engineering University , China
3. School of Mechanical and Electrical Engineering, Harbin Engineering University, China
zhanghq1@126.com, s315110052@hrbeu.edu.cn, zhq402@hrbeu.edu.cn, Liuaidong@hrbeu.edu.cn
Abstract—Templates with Al
2
O
3
nanoporous was prepared in
method of in-situ growth. A nano-material carrier of γ-Al
2
O
3
-
ZrO
2
-ThO
2
was designed by chemical deposition based on these
templates. Using this carrier as active components, a Pd catalyst
with high catalytic oxidation activity was fabricated for CH
4
sensor. As analysis of scanning electron microscopy(SEM) shown,
the Pd catalyst could uniformly distribute in the nano-material
carrier of γ-Al
2
O
3
-ZrO
2
-ThO
2
. A CH
4
sensor with Pd catalyst in
the nano-material carrier of γ-Al
2
O
3
-ZrO
2
-ThO
2
was fabricated.
As experiments proved, the activity of this CH
4
sensor has good
linearity and rapidity. In CH
4
concentration range of 0～4.7%,
every 1% CH
4
concentration parallels every 12mv voltage of this
CH4 sensor. Response time from low concentration to 90% high
concentration was 6s. Recover time from high concentration to
90% low concentration was 8s.
Keywords—catalyst; carrier; nano-tube array; CH
4
; sensor
I. INTRODUCTION
Thermal stability at high temperature and activity at low
temperature are the two key problems of catalysts for catalytic
combustion of CH
4
[1,2]. Pd and other supported noble metal
with good catalytic performance is the classic catalyst with
activity at low temperature for combustion of CH
4
. If the
catalyst was the single noble metal, failures caused by high-
temperature sintering and agglomeration evaporation easily
occur[3,4]. Recently, metal oxide catalyst even the one co-
modified by transition metal oxides attracted wide attention.
In high-temperature combustion of CH
4
, it is an effective
method to improve stability of CH
4
sensor by using metal
oxide catalyst co-modified by weak-radioactivity metal oxides
to improve the thermal activity for noble metal catalyst.
Compared to the sensor with Pt or other noble metal coils
as catalyst carrier, the sensor with mesoporous alumina as
catalyst carrier has lower power consumption and drift[5,6,7].
If there is serious carbon deposition on the surface of catalyst
carrier caused by inadequate combustion of high-carbon
Alkanes, the efficiency of the catalyst will be decreased even
the stability of the sensor will be also decreased. Thus, it is the
primary requirement for high-stability sensors that the catalyst
carrier should have high-throughout nano-porous for
polymers[8,9,10].
Because of uniformly distributed nano-porous, there are
more permeable channels in the nano-tubes array carrier based
on Templates with Al
2
O
3
nanoporous prepared in method of
in-situ growth than the classic granular Al
2
O
3
carrier. Thus,
the nano-tubes array carrier may replace the the classic
granular carrier in fabrication of CH
4
sensors.
In this paper, the nano-tubes array Al
2
O
3
was modified to
improve the single γ- Al
2
O
3
carrier in agglomeration, thermal
Stability and restraint of metal catalyst. A CH
4
sensor with Pd
catalyst in the nano-material carrier of γ-Al
2
O
3
-ZrO
2
-ThO
2
was fabricated.
II. FABRICATION OF CH
4
SENSOR
A. Equipment for in-situ growth preparation of templates
with Al
2
O
3
nanoporous
The Equipment for in-situ growth preparation of templates
with Al
2
O
3
nanoporous is a two-electrodes system that
consists of pure Aluminum as cathode, gold foil as anode,
mixture of Sulfuric Acid and oxalic acid as electrolyte, and
AC Voltage Regulator as power. The distance between the
two-eclectrodes could be adjusted. The temperature of the
mixture is measured by a thermometer, controlled by a flume
system, and forced to cycle by an electromagnetic pump.
Fig. 1. Test equipment for preparation of templates for in-situ growth Al
2
O
3
nanoporous
320
978-1-5386-5373-9/18/$31.00 ©2018 IEEE
2018 IEEE 4th Information Technology and Mechatronics Engineering Conference (ITOEC 2018)
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