检索结果-南通市图书馆

Spacial hindrance induced recovery of over-poisoned active acid sites in pyridine-modified h-mordenite for dimethyl ether carbonylation

引用

Chinese Journal of Catalysis 2019年第6期40卷 895-904页

作者： Na Zhao Ye Tian Lifu Zhang Qingpeng Cheng Shuaishuai Lyu Tong Ding Zhenpeng hu Xinbin Ma Xingang Li Collaborative Innovation Center of Chemical Science and Engineering(Tianjin) School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China Tianjin Key Laboratory of Applied Catalysis Science and Engineering Tianjin UniversityTianjin 300072China School of Physics Nankai UniversityTianjin 300071China Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China

Zeolite catalysts,such as h-mordenite(h-MOR),are readily deactivated by coke deposition in carbonylation *** modification of h-MOR can improve its stability but can lead to an undesirable loss in catalytic ***,we report the intrinsic impact of the pyridine adsorption behavior on h-MOR and the spacial hindrance of the zeolite frameworks on dimethyl ether(DME)carbonylation at a molecular *** discovered that acid sites at O2 positions,located on common walls of eight-membered ring(8-MR)side pockets and 12-MR channels,were active in DME carbonylation,but were unfortunately poisoned during pyridine *** functional theory calculations revealed that the pyridine-poisoned acid sites at the O2 positions could be easily regenerated due to the spacial hindrance of the zeolite ***,they can be facilely regenerated by proper thermal treatment,which induces 60%promotion in the catalytic activity along with a high *** findings demonstrate the determining role of O2 positions in h-MOR for DME carbonylation and provide a new avenue for the rational design of other efficient zeolite-relevant catalytic systems.

关键词： h-mordenite Pyridine modification Dimethyl ether Carbonylation Regeneration Spacial hindrance

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

Bi-Pt催化剂在h-mordenite载体上的甘油选择性氧化

引用

燃料化学学报 2012年第11期40卷 1323-1327页

作者：周洁赵宁肖福魁魏伟孙予罕中国科学院山西煤炭化学研究所山西太原030001 中国科学院研究生院北京100049 中国科学院上海高等研究院低碳能源转化中心上海201203

以Bi-Pt/h-mordenite为催化剂,对甘油(GLY,Glycerol)选择性氧化制备二羟基丙酮(DhA,Dihydroxyacetone)进行了研究。采用BET对催化剂进行表征,结果表明,催化剂的比表面积对催化剂的反应性能影响较小。甘油的裂解是主要的副反应,而h-morde... 详细信息

以Bi-Pt/h-mordenite为催化剂,对甘油(GLY,Glycerol)选择性氧化制备二羟基丙酮(DhA,Dihydroxyacetone)进行了研究。采用BET对催化剂进行表征,结果表明,催化剂的比表面积对催化剂的反应性能影响较小。甘油的裂解是主要的副反应,而h-mordenite可以抑制甘油的裂解,提高DhA的选择性。最佳反应条件为温度353 K,反应时间2～4 h,空气流量20 mL/min,甘油(水-乙醇1:1混合溶液的质量分数为10%),催化剂为1%Bi-5%Pt/h-mordenite时,甘油的转化率为70.6%,DhA的选择性为61.0%。

关键词：甘油选择性氧化 Bi—Pt h-mordenite 二羟基丙酮

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

highly selective hydration reaction of a-pinene over h-mordenites pretreated with quaternary ammonium salts

引用

Chinese Journal of Chemistry 1995年第3期13卷 280-283页

作者： YU, Jin-Quan ZhOU, Ping XIAO, Shu-DeGuangzhou Institute of Chemistry, Chinese Academy of Sciences, P. O. Box 1122, Guangzhou, Guangdong 510650, China

The application of shape-selectivity of zeolite in petrochemistry has been an ac-tive research area since it was first proposed by Weisz and Frilette, and the tendencyto utilize the potential for specific, highly selective syntheses in the field of inter-mediates and fine chemicals has continued steadily in recent years. Nevertheless,

关键词： α-Pinene h-mordenite quaternary ammonium salts hydration shape-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

halide-free carbonylation of methanol with h-MOR supported CuCeO_(x) catalysts

引用

Frontiers of Chemical Science and Engineering 2021年第5期15卷 1075-1087页

作者： Chaoli Tong Jiachang Zuo Danlu Wen Weikun Chen Linmin Ye Youzhu Yuan State Key Laboratory of Physical Chemistry of Solid Surfaces National Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-EstersiChEMCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen361005China

heterogeneous halide-free carbonylation of methanol to acetates,including methyl acetate(MA)and acetic acid,using non-precious metal catalysts has been a topic of interest for *** key issue is that the water produced by methanol dehydration inhibits the formation of acetyl species and reduces the MA ***,we report that CuCeO_(x)/h-mordenite(h-MOR)catalyst can nearly eliminate the inhibiting effect of water on carbonylation by a water-gas shift reaction(WGSR)on-site,and can thus achieve 96.5%methanol conversion with 87.4%MA selectivity for the halide-free carbonylation of *** results of powder X-ray diffraction,transmission electron microscopy,and scanning electron microscopy show that the Cu and Ce species are highly dispersed on h-MOR even when the CuCeO_(x)contents are as high as 29 wt-%.Fourier transform infrared spectroscopy and CO chemisorption analysis reveal that a small portion of Cu species can migrate into the channel of h-MOR when CuCeO_(x)/h-MOR is calcined at 500℃and these Cu species are converted into Cu^(+) sites upon *** Cu^(+) sites facilitate the WGSR and are also active sites for methanol *** introduction of Ce benefits the inhibition of coke deposits and thus enhances the catalyst stability.

关键词： methanol carbonylation halide-free methyl acetate h-mordenite copper and cerium oxide

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

Modifying the acidity of h-MOR and its catalytic carbonylation of dimethyl ether

引用

Chinese Journal of Catalysis 2016年第9期37卷 1530-1538页

作者： Meixia Wang Shouying huang Jing Lü Zaizhe Cheng Ying Li Shengping Wang Xinbin Ma Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and Technology Tianjin UniversityCollaborative Innovation Center of Chemical Science and Engineering （Tianjin） Tianjin 300072 China

Among the reactions catalyzed by zeolites there are some that exhibit high selectivity due to the spatial confinement effect of the zeolite *** the acidity,particularly the distribution and location of the Bronsted acid sites in the zeolite is effective for making it a better catalyst for these *** prepared a series of h-mordenite（h-MOR） samples by varying the composition of the sol-gel,using different structure directing agents and ***3-TPD and IR characterization of adsorbed pyridine were employed to determine the amount of Bronsted acid sites in the 8-membered ring and 12-membered ring *** was shown that controlled synthesis was a promising approach to improve the concentration of Bronsted acid sites in MOR,even with a low Al *** an appropriate composition of Si and Al in the sol-gel favored a higher proportion of Bronsted acid sites in the 8-membered ring *** as a structure-direct agent gave an obvious enrichment of Bronsted acid sites in the 8-membered *** of dimethyl ether was used as a probe reaction to examine the modification of the acid properties,especially the Bronsted acid sites in the 8-membered ring *** was a linear relationship between methyl acetate formation and the number of Bronsted acid sites in the 8-membered ring channels,demonstrating the successful modification of acid *** results provide information for the rational design and modification of zeolites with spatial constraints.

关键词： Zeolite h-mordenite Modification of acidity hydrothermal synthesis Structure-direct agent Post treatment Carbonylation of dimethyl ether

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

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

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：