Comparative Study of Acidic Properties of UZM-5 Nanosheets by Stepwise Adsorption Assisted by a Selective External Poisoning Approach

doi:10.1021/jp5079983

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	Comparative Study of Acidic Properties of UZM-5 Nanosheets by Stepwise Adsorption Assisted by a Selective External Poisoning Approach
	Lin, Sen 1; Shi, Lei 2; Yu, Tingting 2
	2015-01-15
发表期刊	JOURNAL OF PHYSICAL CHEMISTRY C
卷号	119 期号:2 页码:1008-1015
摘要	UZM-5 zeolite was hydrothermally synthesized using a TMA(+)/TEA+ mixed-template as a structure-directing agent (SDA). The resulting sample displays a sheet-like morphology and a uniform particle size of 100-300 nm. The thickness of the particles is ca. 15 nm, corresponding to 5 unit cells. UZM-5 has an 8-membered ring (8-MR) micropore system with a pore diameter of 3.8 angstrom, a secondary mesopore system with a narrow pore size distribution centered at 3.5 nm, specific surface area of 576 m(2)/g and significantly large external surface area of 122 m(2)/g. The nature and the location of acid sites were determined from the temperature-programmed desorption (TPD) of basic probes with various sizes and an FT-IR method, combined with topological analysis. It was found that the density of the acid sites on the external surface of particles is higher than that in the micropores. Regarding the acid sites on the external surface of particles, the highly exposed double 4-ring (D4R) units represent dominantly strong Bronsted-type acidity, while the strong Lewis type acid sites distribute mainly inside and/or very close to the wbc cages at the bottom of the 16-membered ring (16-MR) cavities. Besides the topological constraints, the separated acid sites on the large external surface of UZM-5 particles play a negative role on its inferior catalytic performance in the methanol-to-olefin (MTO) process.
文章类型	Article
WOS标题词	Science & Technology ; Physical Sciences ; Technology
DOI	10.1021/jp5079983
关键词[WOS]	METHANOL CONVERSION ; MOLECULAR-SIEVES ; ZEOLITE ; HYDROCARBONS ; MECHANISM ; CATALYSIS ; H-ZSM-5 ; MFI ; 2,6-DIMETHYLPYRIDINE ; ISOMERIZATION
收录类别	SCI
语种	英语
WOS研究方向	Chemistry ; Science & Technology - Other Topics ; Materials Science
WOS类目	Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary
WOS记录号	WOS:000348094000016
引用统计
文献类型	期刊论文
条目标识符	http://ir.qibebt.ac.cn/handle/337004/6104
专题	多相催化转化研究组
作者单位	1.Chinese Acad Sci, Qingdao Inst Bioenergy & Bioproc Technol, Key Lab Biofuels, Qingdao 266101, Peoples R China 2.Qllu Univ Technol, Key Lab Fine Chem Univ Shandong, Jinan 250353, Peoples R China
推荐引用方式 GB/T 7714	Lin, Sen,Shi, Lei,Yu, Tingting. Comparative Study of Acidic Properties of UZM-5 Nanosheets by Stepwise Adsorption Assisted by a Selective External Poisoning Approach[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2015,119(2):1008-1015.
APA	Lin, Sen,Shi, Lei,&Yu, Tingting.(2015).Comparative Study of Acidic Properties of UZM-5 Nanosheets by Stepwise Adsorption Assisted by a Selective External Poisoning Approach.JOURNAL OF PHYSICAL CHEMISTRY C,119(2),1008-1015.
MLA	Lin, Sen,et al."Comparative Study of Acidic Properties of UZM-5 Nanosheets by Stepwise Adsorption Assisted by a Selective External Poisoning Approach".JOURNAL OF PHYSICAL CHEMISTRY C 119.2(2015):1008-1015.