Y-Ba-Cu-O mixed oxides for production of diphenols in liquid-solid phase

来源 :Chinese Journal of Chemistry | 被引量 : 0次 | 上传用户:tcf274617008
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
Superconductor mixed oxides were often used as catalysts at higher temperature in gas phase oxidations, and considered not suitable for lower temperature reactions in the liquid-solid phase; here the catalysis of YBa2Cu3O7+x and Y2BaCuO5+x in the phenol hydroxylation at lower temperature with H2O2 as oxygen donor was studied, and found that the superconductor YBaCu3O7±x has no catalytic activity for phenol hydroxylation, but Y2BaCuO5±x does, even has better catalytic activity and stability than most previously reported ones. With the studies of catalysis of other simple metal oxides and perovskite-like mixed oxides, a radical substitution mechanism is proposed and the experimental facts are explained clearly, and draw a conclusion that the perovskite-like mixed oxides with (AO)(ABO3) and (AO)2(ABO3) structure have better catalytic activity than the simple per-ovskite oxides with (ABO3)3 structure alone, and (AO) structure unit is the key for the mixed oxides to have the phenol hydroxylation activity.
其他文献
参选内容:此次年度创新大奖共分为5大类别分开并公开进行评选。5大类别分别为:工具软件、工具硬件、电子及测试、工程材料、运动控制。各个厂商可以依照类别,各自选出2012年最具创新意识的产品参与各个奖项的评选。  奖项设置: 每个大类分别产出冠亚季军三组  评选方式:材料收集完毕后,我社将从60万名读者中选取20万名,发送邀请参与评选的邮件,让读者自行从中选取自己心目中最能代表当前类别最高技术水平的产
免疫球蛋白Ig是由浆细胞、前浆细胞或淋巴细胞产生的,人体每天约有1/4的免疫球蛋白进行更换。健康人每日可合成2~5克免疫球蛋白,但在感染、应急反应时,合成量能增加7倍。所以
问任何一个医学生,他或她都会告诉你阿司匹林可以减轻发热、疼痛及炎症,但可以引起溃疡。医学生还可能想到它可以延长出血、预防脑卒中及心脏病发作,但不太可能知道它在癌症
期刊
东方汽轮机厂(以下简称东汽)是我国研究、设计、制造大型电站汽轮机的重大动力装备制造企业,也是德阳建设国家重大技术装备制造业基地的三大支柱企业之一。东汽在过去发展的
Ab initio calculation,B32 and B32H~-14Ab initio molecular orbital theory,fullerene,ni- trogen cluster,boron nitride cluster 490Ab initio,p-complex structure,iso
参七固肾丸系我院名老中医余惠民积40余年临床经验研制而成。余惠民主任中医师悬壶济世50余年,专攻内科,独钟肾病,现为“第二届湖北中医名师”、“湖北省知名中医师”。参七
请下载后查看,本文暂不支持在线获取查看简介。 Please download to view, this article does not support online access to view profile.
《柳如是别传》是陈寅恪是大部头的一部专著,也是历史考证学派的压轴之作。柳如是深明民族大义、坚守民族气节,但又热衷功名、攀附权贵,其生活和性格是复杂的。本书在诗学上的价
《天方夜谭》是阿拉伯民间故事集《一千零一夜》的中译名,名字译得诡异,最终作为成语收入《成语大辞典》,比喻离奇不经、不足凭信的言行。阿里巴巴是《天方夜谭》中一篇故事《阿里巴巴和四十大盗》的主角,出身穷苦,一贫如洗,一个偶然的机会,他发现了四十大盗的藏宝库,并记下了“芝麻芝麻请开门”的暗语,历经劫难,化险为夷,最终将山洞里的财宝分与穷人,让大家都过上了好日子。  这个一千多年前的阿拉伯民间故事,9月1
The concerted reaction mechansim of the ketene-methylenimine cycloaddition reaction was reconfirmed by IRC calculation at HF/6-31G level.Other possible reactio