Dissertation
Dissertation > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation components,parts > Transmitter ( converter),the sensor > Chemical sensors

Different electrocatalytic properties of ammonia oxidation catalyst in the organic electrolyte

Author ChenChong
Tutor LuTianHong
School Nanjing Normal University
Course Physical and chemical
Keywords An electrochemical gas sensor of the current type Ammonia Propylene carbonate Ethylene glycol dimethyl ether Of Pt catalyst Carbon Supported Pt-Ru catalyst Carbon Supported Ir catalyst Carbon Supported Pt-Ir catalysts
CLC TP212.2
Type Master's thesis
Year 2011
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Ammonia has been widely used in industrial production , but ammonia is a toxic gas , even if the concentration of the trace will cause harm to humans . Therefore , monitoring of ammonia in the working and living environment of great significance , so the development of online monitoring ammonia , low cost , high sensitivity and good selectivity amperometric ammonia sensor has a very important significance . In this thesis, a high electro-catalytic performance of the catalyst for ammonia oxidation in organic solvents , development of amperometric ammonia sensor using organic electrolyte assembly and performance testing , the main results obtained are as follows : '1 . Carbon contained Pt (Pt / C) the electrochemical performance of the ammonia oxidation catalyst in propylene carbonate (PC) and ethylene glycol dimethyl ether (DME) in an organic solvent found in the PC and a low viscosity of the DME mixed electrolyte , Pt / C catalyst electrode oxidation of NH3 good electrocatalytic properties , good sensitivity , good selectivity , fast response time , and can withstand high temperatures and low humidity conditions . Two different proportion of carbon contained Pt-Ru (Pt-Ru / C) catalyst in an organic solvent of PC / DME , the electrocatalytic performance of the ammonia oxidation with tetrahydrofuran (THF) complex reduction Preparation of Pt and Ru atom ratio were 1:1,2:1,3:1 and 4:1 , Pt-Ru -containing the total mass percentage of 20% , Pt and Ru alloy formed Pt-Ru / C catalyst. Found in the PC / DME organic solvent , Pt - Ru / C catalyst for the oxidation of NH3 electrocatalytic activity and stability also increases with increasing Ru content . Therefore, when the atomic ratio of Pt and Ru 1:1 Pt-Ru / C catalyst for NH3 oxidation electrocatalytic activity and stability . And CO , NO and NO2 basically NH3 detection without interference , but SO2 and H2S , NH3 detection obvious interference . 3 carbon containing Ir (Ir / C) and the Carbon Supported Pt-Ir (Pt-Ir / C) catalyst for ammonia oxidation electrocatalytic properties found in the PC / DME organic solvent Ir catalyst of higher the NH3 oxidation catalytic activity , but stability is not very good . Electrocatalytic stability of Pt-Ir / C catalyst for ammonia oxidation was significantly better than the Ir / C catalyst .

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