Surface characterization of metal oxides-supported activated carbon fiber catalysts for simultaneous catalytic hydrolysis of carbonyl sulfide and carbon disulfide
Surface characterization of metal oxides-supported activated carbon fiber catalysts for simultaneous catalytic hydrolysis of carbonyl sulfide and carbon disulfide
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DOI：
10.1016/j.jes.2020.03.019
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发表时间：
2020-10-01
影响因子：
6.9
通讯作者：
Mei, Yi
中科院分区：
文献类型：
--
作者：
Li, Kunlin;Wang, Chi;Mei, Yi
采用溶胶-凝胶法制备了一系列负载金属氧化物的活性炭纤维（ACF），并测试了其在60 ℃低温下对羰基硫（COS）和二硫化碳（CS2）的同时催化水解活性。考察了金属氧化物的种类、用量、焙烧温度等制备条件对催化剂性能的影响。活性测试表明，催化剂与5重量%，400 ℃焙烧后的Ni（Ni（5）/ACF（400））对COS和CS2的同时催化水解性能最好。采用扫描电子显微镜-能谱仪（SEM-EDS）、比表面积（BET）、X射线衍射（XRD）、CO2程序升温脱附（CO2-TPD）和漫反射傅里叶变换红外光谱（DRFIR）等方法对ACF的表面和结构进行了表征。用电子顺磁共振（EPR）方法研究了金属阳离子缺陷。表征结果表明，Ni在ACF上的负载使ACF催化剂呈碱性，增加了比表面积和微孔数量，提高了催化水解活性。DRFIR结果表明，-OH物种能促进COS和CS2的水解，-COO和-C-O物种能促进催化水解产物H2S的氧化. EPR结果表明，高温煅烧条件下，COS和CS2的吸附提供了更多的活性反应中心。(C)2020中国科学院生态环境科学研究中心由爱思唯尔公司出版
The sol-gel method was used to synthesize a series of metal oxides-supported activated carbon fiber (ACF) and the simultaneous catalytic hydrolysis activity of carbonyl sulfide (COS) and carbon disulfide (CS2) at relatively low temperatures of 60 degrees C was tested. The effects of preparation conditions on the catalyst properties were investigated, including the kinds and amount of metal oxides and calcination temperatures. The activity tests indicated that catalysts with 5 wt.% Ni after calcining at 400 degrees C (Ni(5)/ACF(400)) had the best performance for the simultaneous catalytic hydrolysis of COS and CS2. The surface and structure properties of prepared ACF were characterized by scanning electron microscope-energy disperse spectroscopy (SEM-EDS), Brunauer-Emmett-Teller (BET), X-ray diffraction (XRD), carbon dioxide temperature programmed desorption (CO2-TPD) and diffuse reflectance Fourier transform infrared reflection (DRFTIR). And the metal cation defects were researched by electron paramagnetic resonance (EPR) method. The characterization results showed that the supporting of Ni on the ACF made the ACF catalyst show alkaline and increased the specific surface area and the number of micropores, then improved catalytic hydrolysis activity. The DRFTIR results revealed that-OH species could facilitate the hydrolysis of COS and CS2;-COO and-C-O species could facilitate the oxidation of catalytic hydrolysate H2S. And the EPR results showed that high calcination temperature conditions provide more active reaction center for the COS and CS2 adsorption. (C) 2020 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.