摘要
提出了一种新方法来制备用于钯催化剂的P-γ-Al_(2)O_(3)涂层改性的α-Al_(2)O_(3)泡沫。采用聚氨酯模板法,通过优化工艺参数,使陶瓷泡沫的显气孔率达到90.28%,体积密度达到0.45 g·cm^(-3),且该泡沫具有可使用强度。将掺有P元素的γ-Al_(2)O_(3)涂层涂覆在α-Al_(2)O_(3)泡沫上,然后通过超声波辅助浸渍法来装载活性催化相(Pd)。结果表明,含P涂层增加了惰性泡沫的比表面积和弱酸性位点,同时减少了强酸性位点的占比。与无涂层的泡沫相比,改性的泡沫更容易装载活性相,且装载的金属Pd不容易被氧化,CO的催化转化温度(T_(50),T_(90))降低了50℃左右。该研究证明了低成本改性α-Al_(2)O_(3)陶瓷泡沫在钯催化剂生产中具有极大的应用潜力。
A novel method for the preparation ofα-alumina foams with P-γ-Al_(2)O_(3)modified coating for the palladium catalysts was proposed.The polyurethane template method was used and the preparation parameters were optimized.The apparent porosity of the ceramic foam is 90.28%,the bulk density is 0.45 g·cm^(-3),and the strength of ceramic foam is satisfying.The P-modifiedγ-Al_(2)O_(3)coating was prepared on theα-alumina foam,and then the active catalytic phase(Pd)was loaded by ultrasound-assisted impregnation.Results show that the P-containing coating increases the surface area and weakly acidic sites of the inert foam while decreasing the proportion of strongly acidic sites.Compared with the uncoated foam,the foam with modified coating can easily load the active phase.In addition,the loaded Pd metal can hardly be oxidized,and the catalytic conversion temperature(T_(50),T_(90))of CO reduces by about 50°C.This research presents the great practical potential of low-cost modifiedα-Al_(2)O_(3)ceramic foams in the palladium catalyst production.
作者
魏郁林
史国普
陈嗣确
杨海玲
冀珺
陈莹莹
李新宇
马德礼
潘保财
张振宇
王红磊
Wei Yulin;Shi Guopu;Chen Sique;Yang Hailing;Ji Jun;Chen Yingying;Li Xinyu;Ma Deli;Pan Baocai;Zhang Zhenyu;Wang Honglei(School of Materials Science and Engineering,University of Jinan,Jinan 250022,China;Anhui Dexinjia Biopharm Co.,Ltd,Fuyang 236600,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2023年第1期87-94,共8页
Rare Metal Materials and Engineering
基金
National Natural Science Foundation of China(51872118,51632003)
Shandong Province Key Research and Development Plan(2020JMRH0401,2019RKB01018)
Shandong Provincial Natural Science Foundation(ZR2018PEM008,ZR2019MEM055)。
