检索结果-南通市图书馆

Optimization of conditions for preparation of ZSM-5@silicalite-1 core–shell catalysts via hydrothermal synthesis

Chinese Journal of Chemical Engineering 2018年第10期26卷 2070-2076页

作者： Chuang Liu Yihua Long Zhengbao Wang Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology College of Chemical and Biological Engineering Zhejiang University

Although the preparation of ZSM-5@silicalite-1(ZS) core–shell catalysts has been reported in the literature,their selectivity to para-xylene(PX)in the toluene alkylation with methanol is difficult to *** we present the effects of water and ZSM-5 adding amounts in the synthesis solution,the hydrothermal synthesis time,and the Si/Al ratio of core ZSM-5 on the catalytic performance of ZS core–shell *** ZS core–shell catalysts were characterized by X-ray diffraction (XRD),N_2 adsorption,and NH_3 temperature-programmed desorption (NH_3-TPD) *** highest PX selectivity of 95.5%was obtained for the ZS(Si/Al=140) catalyst prepared in the synthesis solution with a molar ratio of 0.2 TPAOH:1TEOS:250H_2O at 175°C and 10 r·min^(-1) for only 2 h and the corresponding toluene conversion is as high as 22.8% for the alkylation of toluene with methanol.

关键词： ZSM-5 Silicalite-1 Core–shell catalyst Alkylation para-selectivity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Visible-light-enabled ruthenium-catalyzed para-C-H difluoroalkylation of anilides

引用

Chinese Chemical Letters 2023年第3期34卷 293-297页

作者： Yaohang Cheng Xian Zhang Guanghui An Guangming Li Zhenyu Yang Key Laboratory of Functional Inorganic Material Chemistry(MOE) School of Chemistry and Materials ScienceHeilongjiang UniversityHarbin 150080China School of Pharmaceutical and Materials Engineering Taizhou UniversityTaizhou 318000China

Visible-light-mediated para-C-H difluoroalkylation of anilides via combination of steric effects and Lewis acid activation strategies has been developed. The addition of(C_6H_5O)_(2)P(O)OH and Ag_(2)CO_(3) properly tune the redox potential of ruthenium catalyst and leads to mild reaction conditions. The protocol exhibits broad functional group tolerance and allows the late-stage functionalization of complex bioactive molecules.

关键词： C-H activation para-selectivity Photocatalysis Difluoroalkylation Late-stage functionalization

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Ruthenium(Ⅱ)-catalyzed para-selective C—H difluoroalkylation of aromatic aldehydes and ketones using transient directing groups

引用

Chinese Chemical Letters 2021年第4期32卷 1437-1441页

作者： Yaohang Cheng Yuhang He Jie Zheng Hui Yang Jun Liu Guanghui An Guangming Li Key Laboratory of Functional Inorganic Material Chemistry(MOE) School of Chemistry and Materials ScienceHeilongjiang UniversityHarbin 150080China College of Materials Science and Chemical Engineering Harbin Engineering UniversityHarbin 150001China

A Ru(Ⅱ)-catalyzed para-difluoroalkylation of aro matic alde hydes and ketones with a tra nsient directing group has been *** utilizes less expensive ruthenium catalysts and allows facile access to challenging difluoroalkylated *** mechanism studies suggest that the distinct coordination mode of ruthenium complex with imine moieties is responsible for para-selectivity.

关键词： para-selectivity C-H activation Difluoroalkylation Ruthenium catalysis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：