Properties and Reactivity of Lanthanide (Eu and Yb) Catalysts dispersed on SiO2

DOI: 10.1039/ft9928802251

Source and publish data:

Journal of the Chemical Society - Faraday Transactions p. 2251 - 2256 (1992)

Update date:2022-08-30

Topics:

Authors:

Imamura, Hayao

Konishi, Tomohiro

Sakata, Yoshihisa

Tsuchiya, Susumu

Read Full Text PDF DownLoad Join now for total 90,000,000 free articles

Article abstract of DOI:10.1039/ft9928802251

Lanthanide metals (Ln: Eu and Yb) dissolved in liquid ammonia react with SiO2 to form active Ln/SiO2 catalysts.The behaviour of lanthanides present on SiO2 varies markedly with the level of lanthanide loading.For low loadings, lanthanide catalysts immobilized on SiO2, formed by the preferential reaction of lanthanides with surface hydroxyl groups on SiO2 and which Fourier-transform infrared studies have shown have the structure , exhibited selective hydrogenation properties, discriminating between conjugated and non-conjugated dienes.This was further confirmed by using polyvinyl alcohol (PVA) with uniform hydroxyl groups as a model compound.The lanthanide-bound PVA exhibited similar catalytic properties and the turnover frequencies of Ln/PVA were very close to those of Ln/SiO2.For high loadings of lanthanide, Ln/SiO2 additionally showed selective hydrogenation of alkynes; only internal C-C triple bonds were reduced in marked contrast to terminal C-C bonds.The active catalysts were those in which the lanthanide used, in excess compared with the surface hydroxyl groups on SiO2, was highly dispersed on the support in an active metallic form, leading to the selective hydrogenation of alkynes.

Full text of DOI:10.1039/ft9928802251

View Online / Journal Homepage / Table of Contents for this issue

View Online

Products guided by the article

Product name:1-Butene

Cas No:106-98-9

R&D Labs maybe for 106-98-9

Suzhou Kangrun Pharmaceutical, Inc

Contact:86-512-63912376，63913329

Address:Building 2, No. 2358 ,Chang'an Rd, Wujiang Economic Development Zone Pioneering park, china
Jiangxi Hito Chemical Co., Ltd.

Contact:+86-792-3170318

Address:No. 6, Tianhong Ave., Xinghuo Industry Park, Yongxiu, Jiujiang, Jiangxi, China
Shanghai SMEC Trading Co., Ltd.

website:http://www.shanghaismec.com

Contact:+86-21-68811293

Address:ROOM 1101,NO.800 SHANGCHENG RD,SHANGHAI,CHINA
BOC Sciences

website:https://www.bocsci.com/

Contact:1-631-485-4226

Address:Ramsey Road
HEZE KINGVOLT CHEMICAL CO., LTD

Contact:86-573-82118911

Address:Juancheng Industry Park

Relevant to this article

Zirconium oxychloride as a new and efficient catalyst for the synthesis of 3,4-dihydropyrimidine-2(1h)-thione/one under solvent-free microwave irradiation conditions

Doi:10.1515/HC.2007.13.1.67
(2007)
In situ fabrication of AgI/AgVO₃ nanoribbon composites with enhanced visible photocatalytic activity for redox reactions

Doi:10.1039/c5cy00787a
(2016)
A condensed phenylpropanoid glucoside and pregnane saponins from the roots of Hemidesmus indicus

Doi:10.1007/s11418-012-0659-6
(2013)
Synthesis, vibrational spectroscopic investigations, molecular docking, antibacterial studies and molecular dynamics study of 5-[(4-nitrophenyl)acetamido]-2-(4-tert-butylphenyl)benzoxazole

Doi:10.1016/j.molstruc.2016.12.020
(2017)
Origin of "Hetero Effect" on Nitrogen Inversion. Comparison of Hydroxylamines and Aminoxide Anions

Doi:10.1021/jo00025a016
(1991)
Thermal [2 + 2]-Cycloaddition of Ketenes with Chiral Enol Ethers: Route to Densely Substituted Cyclobutanones

Doi:10.1021/acs.orglett.6b01058
(2016)

Article Doi