scholarly journals Acidic Mesoporous Zeolite ZSM-5 Supported Cu Catalyst with Good Catalytic Performance in the Hydroxysulfurization of Styrenes with Disulfides

Nanomaterials ◽  
2017 ◽  
Vol 7 (12) ◽  
pp. 459 ◽  
Author(s):  
Jun Hu ◽  
Chaojie Zhu ◽  
Feifei Xia ◽  
Zhongxue Fang ◽  
Fengli Yang ◽  
...  
Keyword(s):  
Catalytic Performance ◽  
Mesoporous Zeolite ◽  
Cu Catalyst

Oxidative Carbonylation of Methanol to Dimethyl Carbonate by Chlorine-Free Homogeneous and Immobilized 2,2'-Bipyrimidine Modified Copper Catalyst

2007 ◽  
Vol 72 (8) ◽  
pp. 1094-1106 ◽  
Author(s):  
Szilárd Csihony ◽  
László T. Mika ◽  
Gábor Vlád ◽  
Katalin Barta ◽  
Christian P. Mehnert ◽  
...  
Keyword(s):  
High Pressure ◽  
Dimethyl Carbonate ◽  
Copper Catalyst ◽  
Catalytic Performance ◽  
Spectroscopic Studies ◽  
Oxidative Carbonylation ◽  
Cu Catalyst

A chlorine-free catalyst, prepared in situ from Cu(II) acetate and 2,2'-bipyrimidine, can be used for the oxidative carbonylation of methanol to dimethyl carbonate. In situ high pressure IR and NMR spectroscopic studies suggest the formation of [Cu(2,2'-bipyrimidine)(CO)- (OMe)] as one of the key intermediates. The catalytic performance of the 2,2'-bipyrimidine-modified Cu-catalyst is similar to the CuCl-based system. The chlorine free catalyst can be immobilized by using the copolymer of 5-vinyl-2,2'-bipyrimidine and styrene.

scholarly journals Designing a Mesoporous Zeolite Catalyst for Products Optimizing in n-Decane Hydrocraking

Catalysts ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 766 ◽  
Author(s):  
Li Tan ◽  
Xiaoyu Guo ◽  
Xinhua Gao ◽  
Noritatsu Tsubaki
Keyword(s):  
Mass Transfer ◽  
Active Sites ◽  
Zeolite Catalyst ◽  
Catalytic Performance ◽  
Hydrogen Spillover ◽  
Mesoporous Zeolite ◽  
Mesoporous Catalyst ◽  
Hydrogen Atoms ◽  
Effect Factors ◽  
And Diffusion

Mesoporous ZSM-5 zeolite is developed to enhance the catalytic performance in a hydrocracking reaction. The generated mesopores and mesoporous channels in the new catalyst supply more opportunities for reactant accessing the active sites according to the better mass transfer and diffusion. Meanwhile, the acidity of the mesoporous catalyst is also weakened because of the removal of Si and Al species from its MFI structure, which makes the products distribution drift to more valued chemicals such as olefins. In the modified mesoporous ZSM-5 zeolites via different metallic promoters, the olefins’ selectivity increases as the alkalinity of the catalyst increases. The reason for this is that the formed olefins will be further hydrogenated into corresponding alkanes immediately over the extremely acidic zeolite catalyst. Hence, the moderate alkalinity will limit this process, while at the same time the remaining olefins products will too. Furthermore, the Pd-based mesoporous ZSM-5 zeolite shows an excellent n-decane conversion and high propane selectivity due to the occurrence of hydrogen spillover via the Pd promoter. The phenomenon of hydrogen spillover supplies more chemisorbed sites of hydrogen atoms for hydrocracking and hydrogenating in this reaction. In short, this study explores the important effect factors in n-decane hydrocracking reaction activity and products distribution. It also shows a potential for the further industrial application of petroleum-derived fuel hydrocracking according to the optimized products distribution under metallic promoted mesoporous zeolite.

Facile Synthesis of Mesoporous Zeolite Y with Improved Catalytic Performance for Heavy Oil Fluid Catalytic Cracking

2014 ◽  
Vol 53 (8) ◽  
pp. 3406-3411 ◽  
Author(s):  
Junsu Jin ◽  
Chaoyun Peng ◽  
Jiujiang Wang ◽  
Hongtao Liu ◽  
Xionghou Gao ◽  
...  
Keyword(s):  
Heavy Oil ◽  
Catalytic Cracking ◽  
Zeolite Y ◽  
Catalytic Performance ◽  
Fluid Catalytic Cracking ◽  
Mesoporous Zeolite ◽  
Facile Synthesis

A novel supported Cu catalyst with highly dispersed copper nanoparticles and its remarkable catalytic performance in methanol decomposition

RSC Advances ◽  
2014 ◽  
Vol 4 (94) ◽  
pp. 52008-52011 ◽  
Author(s):  
Shaojun Qing ◽  
Xiaoning Hou ◽  
Yajie Liu ◽  
Hongjuan Xi ◽  
Xiang Wang ◽  
...  
Keyword(s):  
Copper Nanoparticles ◽  
Catalytic Performance ◽  
Methanol Decomposition ◽  
Impregnation Method ◽  
Highly Dispersed ◽  
Cu Catalyst

Modification of SiO2 by starch makes it possible to prepare an efficient Cu/SiO2 catalyst for methanol decomposition by the simple impregnation method.

scholarly journals Anchoring Cu1 species over nanodiamond-graphene for semi-hydrogenation of acetylene

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Fei Huang ◽  
Yuchen Deng ◽  
Yunlei Chen ◽  
Xiangbin Cai ◽  
Mi Peng ◽  
...  
Keyword(s):  
Transition Metal ◽  
Selective Hydrogenation ◽  
High Selectivity ◽  
Catalytic Performance ◽  
Transition Metal Catalysts ◽  
Effective Activation ◽  
Earth Abundant ◽  
Unique Structural Feature ◽  
Cu Catalyst ◽  
Excellent Catalytic Performance

Abstract The design of cheap, non-toxic, and earth-abundant transition metal catalysts for selective hydrogenation of alkynes remains a challenge in both industry and academia. Here, we report a new atomically dispersed copper (Cu) catalyst supported on a defective nanodiamond-graphene (ND@G), which exhibits excellent catalytic performance for the selective conversion of acetylene to ethylene, i.e., with high conversion (95%), high selectivity (98%), and good stability (for more than 60 h). The unique structural feature of the Cu atoms anchored over graphene through Cu-C bonds ensures the effective activation of acetylene and easy desorption of ethylene, which is the key for the outstanding activity and selectivity of the catalyst.

Enhancing catalytic performance of Cu-SSZ-13 for NH3-SCR reaction via in situ introduction of Fe3+ with diatomite

2021 ◽  
Author(s):  
Mengyang Chen ◽  
Yingzhen Wei ◽  
Jinfeng Han ◽  
Wenfu Yan ◽  
Jihong Yu
Keyword(s):  
High Temperature ◽  
Catalytic Performance ◽  
Hydrothermal Stability ◽  
Highly Efficient ◽  
Nh3 Scr ◽  
Cu Catalyst

The SSZ-13 zeolite supported Cu catalyst is highly efficient in eliminating the NOx and introduction of Fe3+ ions can significantly improve the high-temperature activity and the hydrothermal stability of Cu-SSZ-13....

Superior Catalytic Performance of Mesoporous Zeolite TS-1 for the Oxidation of Bulky Organic Sulfides

ChemCatChem ◽  
2013 ◽  
Vol 5 (8) ◽  
pp. 2191-2194 ◽  
Author(s):  
Zhenzhen Kang ◽  
Guoyong Fang ◽  
Qingping Ke ◽  
Jianbo Hu ◽  
Tiandi Tang
Keyword(s):  
Catalytic Performance ◽  
Mesoporous Zeolite ◽  
Organic Sulfides

The Structure, Morphology and Catalytic Performance of a Silica Supported Cu Catalyst for Ethylene Glycol Synthesis

2011 ◽  
Vol 217-218 ◽  
pp. 1070-1074 ◽  
Author(s):  
Ling Jun Zhu ◽  
Shu Rong Wang ◽  
Xiao Lan Ge ◽  
Xin Bao Li ◽  
Zhong Yang Luo
Keyword(s):  
Ethylene Glycol ◽  
Catalytic Performance ◽  
Sem And Tem ◽  
Structure Morphology ◽  
Cu Catalyst ◽  
Hydrolysis Of ◽  
Phase Solution

A silica supported Cu catalyst with good performance for ethylene glycol (EG) production was prepared by the hydrolysis of tetramethoxysilane (TMOS) in one phase solution using methanol as co-solvent, followed by the precipitation of copper on SiO2 by ammonia evaporation. XRD, SEM and TEM were carried out to characterize the structural and morphology properties of the catalyst. The results showed that Cu particles were homogeneously dispersed on the support and thus lead to the high catalytic performance.

scholarly journals Synthesis of Mesoporous Zeolite ZSM-5 via Gel Conversion with Polyethyleneglycol as Template and Its Catalytic Performance

2015 ◽  
Vol 30 (11) ◽  
pp. 1148 ◽  
Author(s):  
AN Jian-Guo ◽  
GAO Xiang ◽  
JIN Jun-Jiang ◽  
GU Jin-Lou ◽  
LI Liang ◽  
...  
Keyword(s):  
Catalytic Performance ◽  
Mesoporous Zeolite
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