Formaldehyde oxidation on Pd/USY catalysts at room temperature: The effect of acid pretreatment on supports  

作　　者：Xiaofeng Liu Chunying Wang Yumin Chen Qi Qin Yaobin Li Hong He 

机构地区：[1]Center for Excellence in Regional Atmospheric Environment,Key Laboratory of Urban Pollutant Conversion,Chinese Academy of Sciences,Institute of Urban Environment,Xiamen 361021,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control,Chinese Academy of Sciences,Ningbo Urban Environment Observation and Research Station-NUEORS,Ningbo 315800,China [4]State Key Joint Laboratory of Environment Simulation and Pollution Control,Research Center for Eco-environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China [5]Xiamen Key Laboratory of Materials for Gaseous Pollutant Control,Chinese Academy of Sciences,Institute of Urban Environment,Xiamen 361021,China

出　　处：《Journal of Environmental Sciences》2023年第3期811-822,共12页环境科学学报（英文版）

基　　金：supported by the Central government guides local funds for science and technology development (No. 2020L3023);the NSF of Fujian Province (No. 2018J01024), Youth Innovation Promotion Association, Chinese Academy of Sciences (CAS) (No. 2020310);the Fujian Institute of Research on the Structure of Matter and Institute of Urban Environment (FJIRSM&IUE) Joint Research Fund (No. RHZX-2019-001);the Science and Technology Planning Project of Xiamen City (No. 3502Z20191021)。

摘　　要：The complete catalytic oxidation of formaldehyde (HCHO) to CO_(2)and H_(2)O at room temperature is a green route for indoor HCHO removal.Zeolite is an excellent carrier material for HCHO oxidation due to its large surface area,intricate pores and high adsorption capacity.However,the zeolite-supported noble metal catalysts have currently shown relatively low activity especially at room temperature.In this work,we present a facile acid treatment strategy for zeolite catalysts to improve the hydroxyl concentration and further enhance their catalytic activity for HCHO oxidation.Activity tests illustrated that HCHO could be completely oxidized to CO_(2)and H_(2)O at a nearly 100%conversion rate with a weight hourly space velocity (WHSV) of 150,000 mL/(g·hr) at 25℃,when the support of Pd/USY catalysts was pretreated by hydrochloric acid with a concentration of 0.20 mol/L.The characterization results revealed that the active hydroxyl groups originated from the dealumination in the acid treatment play a key role in the HCHO oxidation reaction.The deduced reaction mechanism suggests that bridging hydroxyl groups may oxidize HCHO to dioxymethylene(DOM) species and terminal hydroxyl groups are responsible for the transformation of DOM groups to formate (HCOO) species.

关 键 词：Formaldehyde oxidation USY zeolite Acid treatment Hydroxyl groups 

分 类 号：X51[环境科学与工程—环境工程]