Bolaform surfactant-directed synthesis of TS-1 zeolite nanosheets for catalytic epoxidation of bulky cyclic olefins

2020 ◽  
Vol 10 (5) ◽  
pp. 1323-1335
Author(s):  
Na Li ◽  
Manyun Wang ◽  
Qing You ◽  
Chenyao Bi ◽  
Huiyong Chen ◽  
...  
Keyword(s):  
Catalytic Performance ◽  
Structure Directing Agent ◽  
Cyclic Olefins ◽  
Catalytic Epoxidation ◽  
Directed Synthesis ◽  
Epoxidation Of Cyclohexene

Hierarchical TS-1 nanosheets were hydrothermally synthesized by using a bolaform surfactant as the structure-directing agent and exhibited improved catalytic performance and superior recyclability in the epoxidation of cyclohexene and cyclooctene.

Positive Role of Synthesis Method and Hard Template on the Catalytic Performance of SAPO-34 in Methanol to Olefin Reaction.

2020 ◽  
Vol 23 ◽  
Author(s):  
Sajjad Rimaz ◽  
Reza Katal
Keyword(s):  
Particle Size ◽  
Synthesis Method ◽  
Catalytic Performance ◽  
Hard Template ◽  
Structure Directing Agent ◽  
Positive Role ◽  
Methanol To Olefin ◽  
Dg Method ◽  
Synthesis Procedure

: In the present study, SAPO-34 particles were synthesized using hydrothermal (HT) and dry gel (DG) conversion methods in the presence of diethyl amine (DEA) as an organic structure directing agent (SDA). Carbon nanotubes (CNT) were used as hard template in the synthesis procedure to introduce transport pores into the structures of the synthesized samples. The synthesized samples were characterized with different methods to reveal effects of synthesis method and using hard template on their structure and catalytic performance in methanol to olefin reaction (MTO). DG conversion method results in smaller particle size in comparison with hydrothermal method, resulting in enhancing catalytic performance. On the other side, using CNT in the synthesis procedure with DG method results in more reduction in particle size and formation of hierarchical structure which drastically improves catalytic performance.

Enhanced Catalytic Performance of the FCC Catalyst with an Alumina Matrix Modified by the Zeolite Y Structure-Directing Agent

2019 ◽  
Vol 58 (14) ◽  
pp. 5455-5463
Author(s):  
Mengjie Xie ◽  
Yifang Li ◽  
Ubong Jerome Etim ◽  
He Lou ◽  
Wei Xing ◽  
...  
Keyword(s):  
Zeolite Y ◽  
Catalytic Performance ◽  
Alumina Matrix ◽  
Structure Directing Agent ◽  
Fcc Catalyst

scholarly journals Ionic Liquids Based on Oxidoperoxido-Molybdenum(VI) Complexes with a Chelating Picolinate Ligand for Catalytic Epoxidation

Reactions ◽  
2020 ◽  
Vol 1 (2) ◽  
pp. 147-161
Author(s):  
Željko Petrovski ◽  
Margarida M. Antunes ◽  
Ana Soraia Mendo ◽  
Luís Cabrita ◽  
Isabel S. Gonçalves ◽  
...  
Keyword(s):  
Differential Pulse ◽  
Catalytic Performance ◽  
Model Reaction ◽  
1H And 13C Nmr ◽  
Catalytic Epoxidation ◽  
Tert Butyl Hydroperoxide ◽  
Ionic Compounds ◽  
Ft Ir ◽  
Pulse Voltammetry ◽  
High Yields

Ionic oxidoperoxido-molybdenum(VI) complexes of the type [Cat][MoO(O2)2(pic)], with pic = N,O-chelated picolinate ligand and Cat = monocation, were prepared in high yields (82–95%) from the precursor complex [H3O][MoO(O2)2(pic)] via [H]+ cation exchange for 1-ethyl-3-methylimidazolium [EMIM]+, 1-butyl-3-methylimidazolium [BMIM]+, 1-octyl-3-methylimidazolium [OMIM]+, N-cetylpyridinium [C16Py]+, and N-methyl-N,N,N-trioctylammonium [Aliquat]+. The structure and purity of the ionic compounds were assessed by 1H and 13C NMR, FT-IR, and elemental analysis (C, H, N), and the electrochemical properties were studied by differential pulse voltammetry (DPV) and cyclic voltammetry (CV). The [Cat][MoO(O2)2(pic)] compounds showed promising catalytic epoxidation activity based on the model reaction of cis-cyclooctene with tert-butyl hydroperoxide as oxidant. The type of cation influenced the physical state of the compound and the catalytic performance.

Preparation and Characterization of Ti-SBA-15 Mesoporous Materials with Varying Si/Ti Molar Ratios

2012 ◽  
Vol 482-484 ◽  
pp. 985-988
Author(s):  
Qiu Ying Huang ◽  
Wei Liu ◽  
Wen Hao Ye ◽  
Xiu Cheng Zheng
Keyword(s):  
Mesoporous Materials ◽  
Hydrothermal Process ◽  
Catalytic Efficiency ◽  
Mesoporous Structure ◽  
Catalytic Performance ◽  
Reaction Conditions ◽  
Molar Ratios ◽  
Good Catalytic Activity ◽  
Epoxidation Of Cyclohexene

Ti-SBA-15 mesoporous materials with different Si/Ti molar ratios were synthesized via a hydrothermal process and characterized by using various techniques. The effect of Si/Ti molar ratios in the gels on the structure and catalytic efficiency in epoxidation of cyclohexene was discussed in details. The results showed that all the Ti-SBA-15 materials retained SBA-15 mesoporous structure and exhibited good catalytic activity. Furthermore,the sample prepared with Si/Ti =50 exhibited the best catalytic performance under the reaction conditions.

Organosilane surfactant-directed synthesis of nanosheet-assembled SAPO-34 zeolites with improved MTO catalytic performance

2019 ◽  
Vol 54 (11) ◽  
pp. 8202-8215 ◽  
Author(s):  
Huiyong Chen ◽  
Manyun Wang ◽  
Mengfei Yang ◽  
Wenjin Shang ◽  
Chenbiao Yang ◽  
...  
Keyword(s):  
Catalytic Performance ◽  
Directed Synthesis

Synthesis of sub-micrometric SAPO-34 by a morpholine assisted two-step hydrothermal route and its excellent MTO catalytic performance

2019 ◽  
Vol 48 (8) ◽  
pp. 2606-2616 ◽  
Author(s):  
Syed ul Hasnain Bakhtiar ◽  
Sher Ali ◽  
Xiaotong Wang ◽  
Fulong Yuan ◽  
Zhibin Li ◽  
...  
Keyword(s):  
Hydrothermal Treatment ◽  
Crystal Size ◽  
Cost Effective ◽  
Catalytic Performance ◽  
Hydrothermal Route ◽  
Light Olefin ◽  
Structure Directing Agent ◽  
Olefin Selectivity

SAPO-34 with a sub-micrometer crystal size was synthesized by a double hydrothermal treatment employing cost-effective morpholine as a structure directing agent, which presented an enhanced catalytic lifetime (nearly 3 times the conventional one) in the reaction of methanol to olefins with a higher light olefin selectivity (total selectivity of 97.1%).

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