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[求助]
求助文献依据，关于HY红外『截至到2008年11月21日』
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求助 HY 或NH4Y 分子筛的红外谱图文献详解 最好是能解决 HY 或NH4Y 在1400 cm-1 处的峰代表什么，要求有文献依据。 当HY 或NH4Y 被 Cd离子交换后 1400 cm-1 处的峰消失了，如何解释？ 备注：不是吡啶红外，也不是拉曼光谱，是Ft-IR 先谢谢大家了，我真的很想知道为什么! [ Last edited by clare on 2008-12-3 at 10:05 ] |
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★ ★
clare(金币+2,VIP+0):这篇没用上
clare(金币+2,VIP+0):这篇没用上
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Trimethylamine as a Probe Molecule To Differentiate Acid Sites in Y-FAU Zeolite: FTIR Study. Sarria, Francisca Romero; Blasin-Aube, Vanessa; Saussey, Jacques; Marie, Olivier; Daturi, Marco. Laboratoire Catalyse Spectrochimie, CNRS-ENSICAEN, Caen, Fr. Journal of Physical Chemistry B (2006), 110(26), 13130-13137. Publisher: American Chemical Society, CODEN: JPCBFK ISSN: 1520-6106. Journal written in English. CAN 145:15613 AN 2006:552840 CAPLUS Abstract In heterogeneous catalysis acidity has a very important influence on activity and selectivity: correct detn. of acidic properties is a base to improve industrial processes. The aim of this work was to study trimethylamine (TMA) as a probe mol. able to distinguish between the different Bronsted acid sites in zeolitic frameworks. Our work mainly focused on faujasite-type zeolites because the HY zeolite is one of the most used acidic catalysts in industrial processes. In this paper, typical IR bands assigned to TMA-protonated species (formed in supercages) are detected in the HY zeolite. TMA interacting by hydrogen bonding with the acid sites located in the sodalite units is also obsd. The wavenumbers of some typical IR bands assigned to TMA-protonated species appear to depend on the acidic strength, and a complementary study with ZSM-5 and X-FAU samples confirms this proposition. |
3楼2008-10-28 10:00:51
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clare(金币+2,VIP+0):辛苦了，这是吡啶红外，用不上，哎！
clare(金币+2,VIP+0):辛苦了，这是吡啶红外，用不上，哎！
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Hydrodesulfurization of dibenzothiophene catalyzed by Ni-Mo sulfides supported on a mixture of MCM-41 and HY zeolite Jing Rena, Anjie Wanga, b, , , Xiang Lia, b, Yongying Chena, b, Haiou Liua and Yongkang Hub aState Key Laboratory of Fine Chemicals, Dalian University of Technology, 158 Zhongshan Road, Dalian 116012, PR China bLiaoning Key Laboratory of Petrochemical Technology and Equipments, Dalian University of Technology, Dalian 116012, PR China Received 9 November 2007; revised 8 April 2008; accepted 14 April 2008. Available online 22 April 2008. Abstract High-performance hydrodesulfurization (HDS) catalysts were prepared by supporting Ni-Mo sulfides on a mixture of mesoporous MCM-41 and microporous HY zeolite. The mixed support was obtained either by physically mixing [MCM-41-HY(M)] or by overgrowing MCM-41 over HY zeolite particles [MCM-41-HY(C)]. Their HDS activities were tested in a trickle bed reactor at 280–340 °C, total pressure 5.0 MPa, H2/feed ratio 1200 Nm3 m−3 and WHSV 27 h−1, using a solution of 0.8 wt% DBT (dibenzothiophene) in decalin as the feed. A synergetic effect of the components in the mixed supports was observed on the supported Ni-Mo sulfides. NiMo/MCM-41-HY(M) exhibited both high HDS activity and hydrocracking activity, whereas NiMo/MCM-41-HY(C) showed a comparable HDS activity but a much lower hydrocracking activity. Moreover, the increase in HDS activity of either catalyst was accompanied by an enhancement in the hydrogenation pathway. The large difference between NiMo/MCM-41-HY(M) and NiMo/MCM-41-HY(C) in the hydrocracking activity may result from their different pore structures. |
2楼2008-10-27 19:56:52
★ ★ ★
clare(金币+1,VIP+0):文献全文求助不到
clare(金币+2,VIP+0):没用上，一团乱，谢谢你，辛苦啦
clare(金币+1,VIP+0):文献全文求助不到
clare(金币+2,VIP+0):没用上，一团乱，谢谢你，辛苦啦
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Title In situ Fourier transform infrared spectroscopy study of HY cracking catalysts: coke formation and the nature of the active sites Creator/Author Blackmond, D.G. (Univ. of Pittsburgh, PA) ; Goodwin, J.G. Jr. ; Lester, J.E. Publication Date 1982 Nov 01 OSTI Identifier OSTI ID: 6221384 Other Number(s) CODEN: JCTLA Resource Type Journal Article Resource Relation J. Catal. ; Vol/Issue: 78:1 Subject 020400 -- Petroleum-- Processing; ;AMMONIUM COMPOUNDS-- CATALYTIC EFFECTS;CATALYTIC CRACKING-- CATALYSTS;HEXENES-- COKING;ZEOLITES-- CATALYTIC EFFECTS; ABSORPTION SPECTROSCOPY;FOURIER TRANSFORMATION;HYDROCARBONS;INFRARED SPECTRA Related Subject ALKENES;CARBONIZATION;CHEMICAL REACTIONS;CRACKING;DECOMPOSITION;HYDROCARBONS;INORGANIC ION EXCHANGERS;INTEGRAL TRANSFORMATIONS;ION EXCHANGE MATERIALS;MATERIALS;MINERALS;ORGANIC COMPOUNDS;PYROLYSIS;SPECTRA;SPECTROSCOPY;THERMOCHEMICAL PROCESSES;TRANSFORMATIONS Description/Abstract An in situ Fourier transform infrared spectroscopic investigation of coke formation on HY cracking catalysts was undertaken using NH/sub 4/Y catalysts calcined between 300 and 538/sup 0/C, with 1-hexene and 4-methylcyclohexene used separately as reactants.^Two types of active sites are proposed for the formation of coke.^One site consists of the Broensted acid hydroxyl groups present after low-temperature calcination.^The second type of site involves a sort of synergism between stronger Broensted acid hydroxyl groups and neighboring Lewis acid cationic sites, formed after high-temperature calcination.^This dual-site suggestion for coking parallels similar suggestions made previously for cracking reactions on these catalysts.^The composition of the coke on the catalysts exhibited a distinct lack of aromatic character, suggesting that the route to coke formation need not always proceed through aromatic precursors. |
4楼2008-10-28 10:13:43
6楼2008-10-29 23:02:18
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