文献类型：期刊文献

英文题名：Effect of acidity and porosity of hierarchical HBEA zeolite on catalytic stability of alpha-methylnaphthalene isomerization

作者：Sun, Hao[1,2,3] Wang, Ao[1,2] Sun, Kang[1,2] Jiang, Jianchun[1,2] Wang, Fang[3] Gu, Zhenggui[3]

第一作者：孙昊;Sun, Hao

通信作者：Sun, H[1];Sun, H[2];Sun, H[3];Gu, ZG[3]

机构：[1]Nanjing Forestry Univ, SFA,Coinnovat Ctr Efficient Proc & Utilizat Fores, Inst Chem Ind Forest Prod,Jiangsu Key Lab Biomass, Chinese Acad Forestry,Natl Engn Lab Biomass Chem, Nanjing 210042, Jiangsu, Peoples R China;[2]Nanjing Forestry Univ, SFA,Coinnovat Ctr Efficient Proc & Utilizat Fores, Inst Chem Ind Forest Prod,Open Lab Forest Chem En, Chinese Acad Forestry,Natl Engn Lab Biomass Chem, Nanjing 210042, Jiangsu, Peoples R China;[3]Nanjing Normal Univ, Coll Chem & Mat Sci, Jiangsu Prov Key Lab Mat Cycling & Pollut Control, Nanjing 210023, Jiangsu, Peoples R China

年份：2019

卷号：26

期号：4

起止页码：961-970

外文期刊名：JOURNAL OF POROUS MATERIALS

收录：;EI(收录号：20184606073011);Scopus(收录号：2-s2.0-85056355742);WOS:【SCI-EXPANDED(收录号:WOS:000475691200004)】；

基金：The project was supported by Jiangsu Key Laboratory for Biomass Energy and Material (JSBEM-S-201506), Guangdong Innovative and Entrepreneurial Research Team Program (2016ZT06N467), National Natural Science Foundation of China (31770629) and National Nonprofit Institute Research Grant of CAFINT (CAFYBB2017SY031).

语种：英文

外文关键词：Hierarchical HBEA zeolite; Acidity; Desilication; alpha-Methylnaphthalene; Isomerization; Stability

摘要：Hierarchical HBEA catalysts were fabricated through alkaline treatment and evaluated in a fixed-bed reactor. The relative crystallinity, pore property, Si/Al molar ratio, coke formation and structure of catalysts were investigated by the methods including X-ray diffraction, N-2 physisorption, X-ray fluorescence, thermogravimetric analysis and transmission electron microscope, respectively. The acidity of catalysts was studied by Fourier transform infrared spectrometry using pyridine as the probe molecule. These results demonstrated that pure NaOH treatment improved the mesoporosity of catalyst, while decreased the beta-methylnaphthalene selectivity and catalyst stability due to the partially destroyed framework and an increase in the concentration of Lewis acid sites. The Lewis acid sites are responsible for the hydride transfer and subsequent reaction that form coke. In contrast, the presence of tetra-propyl-ammonium hydroxide in the mixed-alkali treatment resulted in regular mesopores development, preserved intrinsic zeolite properties and Lewis sites proportion, leading to the maintained beta-MN selectivity and coke deposition rate. The increased mesoporosity and strong Bronsted acid sites amount per number of coke were responsible for the improved coke tolerance of mixed-alkali treated HBEA, and thus its deactivation rate was 41.7% lower than that of HBEA catalyst.