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Characterization of zeolite supporte...

Xu, Liqiang.

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Characterization of zeolite supported mono- and bimetal clusters and their interaction with protons.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Characterization of zeolite supported mono- and bimetal clusters and their interaction with protons./
作者:	Xu, Liqiang.
面頁冊數:	290 p.
附註:	Source: Dissertation Abstracts International, Volume: 55-01, Section: B, page: 0111.
Contained By:	Dissertation Abstracts International55-01B.
標題:	Chemistry, Inorganic. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9415836

Characterization of zeolite supported mono- and bimetal clusters and their interaction with protons.
Xu, Liqiang.

Characterization of zeolite supported mono- and bimetal clusters and their interaction with protons. - 290 p.

Source: Dissertation Abstracts International, Volume: 55-01, Section: B, page: 0111.

Thesis (Ph.D.)--Northwestern University, 1993.

The objectives of this research are to study the interaction of Pd with zeolitic protons and to characterize bimetal PdCuSubjects--Topical Terms:

517253
Chemistry, Inorganic.

Characterization of zeolite supported mono- and bimetal clusters and their interaction with protons.
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100 1 $a Xu, Liqiang. $3 1906915
245 1 0 $a Characterization of zeolite supported mono- and bimetal clusters and their interaction with protons.
300 $a 290 p.
500 $a Source: Dissertation Abstracts International, Volume: 55-01, Section: B, page: 0111.
500 $a Adviser: Wolfgang M. H. Sachtler.
502 $a Thesis (Ph.D.)--Northwestern University, 1993.
520 $a The objectives of this research are to study the interaction of Pd with zeolitic protons and to characterize bimetal PdCu $\ sb{\rm x} $, PdFe $\ sb{\rm x} $ and PtFe $\ sb{\rm x} $ clusters in Y zeolite.
520 $a Mass spectroscopy and FTIR were used to monitor the isotopic exchange of zeolitic protons with D $\ sb2 $. Discrete groups of protons were differentiated from their exchange kinetics. Protons proximal to Pd particles were exchanged with D $\ sb2 $ as rapidly as H atoms adsorbed on Pd. For more remote protons the exchange rate was lower. Spillover of deuterium atoms from Pd particles over a longer distance was excluded because of the small exchange rate observed with a physical mixture of proton-free Pd/NaY and HY. Zeolitic protons enhanced metal dispersion by "chemically anchoring" small reduced Pd particles. These protons also reduced the propensity of very small Pd clusters to chemisorb hydrogen. The mononuclear Pd proton adduct (Pd-H $\ sb{\rm x}\rbrack\sp{\rm x+} $ did not catalyze D/H isotope exchange at 21 $\ sp\circ $\ sb2 $ or D $\ sb2 $.
520 $a The presence of Pd and Pt enhanced the reducibility of Cu $\ sp{2+} $ and Fe $\ sp{2+} $ in Y-zeolites. The extent of Pd-enhanced reduction of Fe $\ sp{2+} $ to Fe $\ sp\circ $ decreased with increasing proton concentration in the zeolite.
520 $a Bimetal PdCu particles in zeolite Y have been characterized using temperature programmed techniques in conjunction with EXAFS. It was shown that the protons generated from the reduction of Pd $\ sp{2+} $ and Cu $\ sp{2+} $ can selectively reoxidize Cu $\ sp\circ $ to Cu $\ sp+ $ and Cu $\ sp{2+} $ at 210 $\ sp\circ $\ sp\circ
520 $a The formation of PdFe $\ sb{\rm x} $ and PtFe $\ sb{\rm x} $ alloy clusters in NaY has been verified by TPR, TPD, FMR, FTIR, Mossbauer spectroscopy and CO hydrogenation studies. The extent of Fe reduction and reoxidation by zeolitic protons was quantified by TPR and TPD. An average composition of Pd $\ sb{16} $\ sb1 $, Pt $\ sb{10} $\ sb1 $ and Pd $\ sb{10} $\ sb3 $ was found for the reduced clusters in PdFe/NaHY, PtFe/NaHY and neutralized PdFe/NaY, respectively. No $\ alpha $- Pd hydride is formed with PdFe $\ sb{\rm x} $ clusters under conditions where this hydride forms readily with Pd clusters. Strong ferromagnetic resonance signals owing to PdFe $\ sb{\rm x} $ or PtFe $\ sb{\rm x} $ particles suggested that Pd and Pt atoms surrounding an Fe atom became polarized. The presence of Fe significantly changed the activity and selectivity of NaY supported Pd and Pt catalysts in the conversion of CO + H $\ sb2 $.
590 $a School code: 0163.
650 4 $a Chemistry, Inorganic. $3 517253
690 $a 0488
710 2 0 $a Northwestern University. $3 1018161
773 0 $t Dissertation Abstracts International $g 55-01B.
790 1 0 $a Sachtler, Wolfgang M. H., $e advisor
790 $a 0163
791 $a Ph.D.
792 $a 1993
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9415836