scholarly journals Identification of C2–C5 products from CO2 hydrogenation over PdZn/TiO2–ZSM-5 hybrid catalysts

2021 ◽  
Author(s):  
Jonathan Ruiz Esquius ◽  
Hasliza Bahruji ◽  
Michael Bowker ◽  
Graham J. Hutchings
Keyword(s):  
High Temperature ◽  
Co2 Hydrogenation ◽  
Chain Growth ◽  
Hybrid Catalysts

PdZn/TiO2 combined with ZSM-5 zeolites allowed for consecutive CO2 hydrogenation to CH3OH, CH3OH dehydration to DME, and MTH/DMTH in a one-pass single bed reactor. PdZn alloys, although stable at high temperature, hydrogenate olefins, limiting MTH/DMTH chain growth.

scholarly journals Synergistic Effect of Alkali Na and K Promoter on Fe-Co-Cu-Al Catalysts for CO2 Hydrogenation to Light Hydrocarbons

Catalysts ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 735
Author(s):  
Yuhao Zheng ◽  
Chenghua Xu ◽  
Xia Zhang ◽  
Qiong Wu ◽  
Jie Liu
Keyword(s):  
Synergistic Effect ◽  
Active Sites ◽  
Intermediate Formation ◽  
Active Phase ◽  
Dissociative Adsorption ◽  
Co2 Hydrogenation ◽  
Chain Growth ◽  
Co2 Conversion ◽  
Light Hydrocarbons ◽  
Active Centers

Alkali metal K- and/or Na-promoted FeCoCuAl catalysts were synthesized by precipitation and impregnation, and their physicochemical and catalytic performance for CO2 hydrogenation to light hydrocarbons was also investigated in the present work. The results indicate that Na and/or K introduction leads to the formation of active phase metallic Fe and Fe-Co crystals in the order Na < K < K-Na. The simultaneous introduction of Na and K causes a synergistic effect on increasing the basicity and electron-rich property, promoting the formation of active sites Fe@Cu and Fe-Co@Cu with Cu0 as a crystal core. These effects are advantageous to H2 dissociative adsorption and CO2 activation, giving a high CO2 conversion with hydrogenation. Moreover, electron-rich Fe@Cu (110) and Fe-Co@Cu (200) provide active centers for further H2 dissociative adsorption and O-C-Fe intermediate formation after adsorption of CO produced by RWGS. It is beneficial for carbon chain growth in C2+ hydrocarbons, including olefins and alkanes. FeCoCuAl simultaneously modified by K-Na exhibits the highest CO2 conversion and C2+ selectivity of 52.87 mol% and 89.70 mol%, respectively.

The High Temperature Gel Permeation Chromatography Study on Poly (Phenylene Sulfide) Linear Chain Propagation

2010 ◽  
Vol 139-141 ◽  
pp. 661-665
Author(s):  
Yu Zhou ◽  
Bo Wen Cheng ◽  
Zhen Huan Li ◽  
De Xin Shen ◽  
Sheng Zhang ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Temperature ◽  
Sodium Sulfide ◽  
Linear Chain ◽  
Gel Permeation Chromatography ◽  
Chain Propagation ◽  
Chain Growth ◽  
Gel Permeation ◽  
Methyl Pyrrolidone ◽  
Phenylene Sulfide

A linear and high molecular weight poly(phenylene sulfide) (PPS) was synthesized from P-dichlorobenzene (P-DCB) and anhydrous sodium sulfide in N-methyl pyrrolidone (NMP), and the High Temperature Gel Permeation Chromatography (HTGPC) technique was utilized to investigate the effects of reaction condition on PPS chain propagation. The experiment results indicated that the high pro-reaction temperature or high post-temperature would interfere with PPS chain propagation, and post-reaction time was another important factor to influence PPS molecular weight (Mw) extension. Furthermore, the optimized ratio of high Mw PPS polymer synthesis was typically at 3-6% molar excess of Na2S over p-dichlorobenzene, and N-methyl-2-pyrrolidone (NMP) were beneficial to the production of high Mw PPS due to the formation of sodium 4-(N-methylamino) butanoate (SMAB). The alkaline reagents such as Na3PO4 and K3PO4 et al could capture the H of -SH, which changed -SH into -SNa and promoted the chain growth of PPS to achieve extension.

Acidity control of zeolite functionality on activity and stability of hybrid catalysts during DME production via CO2 hydrogenation

2018 ◽  
Vol 24 ◽  
pp. 398-406 ◽  
Author(s):  
G. Bonura ◽  
M. Migliori ◽  
L. Frusteri ◽  
C. Cannilla ◽  
E. Catizzone ◽  
...  
Keyword(s):  
Co2 Hydrogenation ◽  
Hybrid Catalysts

Enhanced selectivity of CO2 reverse water-gas reaction over Ni2P/CeO2 catalyst

2021 ◽  
Author(s):  
Sha Cui ◽  
Xiaosheng Wang ◽  
Luhui Wang ◽  
Xianmin Zheng
Keyword(s):  
High Temperature ◽  
Transition Metal ◽  
Hydrogenation Reaction ◽  
Co2 Hydrogenation ◽  
Ni Catalyst ◽  
Metal Phosphide ◽  
Transition Metal Phosphide ◽  
Water Gas ◽  
Metal Sintering ◽  
Enhanced Selectivity

Ni catalyst tended to methanation and easily metal sintering at high temperature in CO2 hydrogenation reaction. Herein, Ni2P, typical kind of transition metal phosphide, had been demonstrated to be efficient...

Hybrid Catalysts for Acetylenes Polymerization Prepared by Anchoring [Rh(cod)Cl]2 on MCM-41, MCM-48 and SBA-15 Mesoporous Molecular Sieves - The Effect of Support Structure on Catalytic Activity in Polymerization of Phenylacetylene and 4-Ethynyl-N-{4-[(trimethylsilyl)ethynyl]benzylidene}aniline

2003 ◽  
Vol 68 (10) ◽  
pp. 1861-1876 ◽  
Author(s):  
Hynek Balcar ◽  
Jan Sedláček ◽  
Jan Svoboda ◽  
Naděžda Žilková ◽  
Jiří Rathouský ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Molecular Sieves ◽  
Catalyst Support ◽  
Mesoporous Molecular Sieves ◽  
Chain Growth ◽  
Homogeneous Catalyst ◽  
Molecular Weights ◽  
Hybrid Catalysts ◽  
Effect Of Support ◽  
Mcm 41

Hybrid catalysts for polymerization of acetylenes were prepared by anchoring, via (3-aminopropyl)trimethoxysilane linker, the [Rh(cod)Cl]2 complex on siliceous mesoporous molecular sieves differing in the pore size and architecture (MCM-41, MCM-48 and SBA-15). In comparison with [Rh(cod)Cl]2 used as homogeneous catalyst, all hybrid catalysts exhibited comparable or even higher catalytic activity in the polymerization of phenylacetylene and 4-ethynyl-N-{4-[(trimethylsilyl)ethynyl]benzylidene}aniline. The initial polymerization rate increased with increasing accessibility of mesoporous surface of catalysts in the order: MCM-41 < MCM-48 < SBA-15. Molecular weights of the prepared polymers increased in reverse order suggesting suppression of the chain growth termination reactions by space limitations in the pores. No effect of catalyst support on the microstructure of formed polymers was found.

Dimethyl ether synthesis from CO2 hydrogenation over hybrid catalysts: effects of preparation methods

2017 ◽  
Vol 121 (1) ◽  
pp. 317-327 ◽  
Author(s):  
A. Kornas ◽  
R. Grabowski ◽  
M. Śliwa ◽  
K. Samson ◽  
M. Ruggiero-Mikołajczyk ◽  
...  
Keyword(s):  
Dimethyl Ether ◽  
Co2 Hydrogenation ◽  
Preparation Methods ◽  
Hybrid Catalysts ◽  
Dimethyl Ether Synthesis ◽  
Ether Synthesis

Direct synthesis of dimethyl ether from CO2 hydrogenation over Cu–ZnO–ZrO2/SO42−–ZrO2 hybrid catalysts: effects of sulfur-to-zirconia ratios

2015 ◽  
Vol 5 (4) ◽  
pp. 2347-2357 ◽  
Author(s):  
Thongthai Witoon ◽  
Tinnavat Permsirivanich ◽  
Nawapon Kanjanasoontorn ◽  
Chalairat Akkaraphataworn ◽  
Anusorn Seubsai ◽  
...  
Keyword(s):  
Dimethyl Ether ◽  
Sulfur Content ◽  
Sulfated Zirconia ◽  
Direct Synthesis ◽  
Co2 Hydrogenation ◽  
Hybrid Catalysts ◽  
Sulfated Zirconia Catalysts ◽  
Synthesis Of Dimethyl Ether

Methanol can be dehydrated to form DME over sulfated zirconia catalysts via pathway I, if the sulfur content is low, and pathway II, if the sulfur content is high.

Stepwise tuning of metal-oxide and acid sites of CuZnZr-MFI hybrid catalysts for the direct DME synthesis by CO2 hydrogenation

2015 ◽  
Vol 176-177 ◽  
pp. 522-531 ◽  
Author(s):  
F. Frusteri ◽  
G. Bonura ◽  
C. Cannilla ◽  
G. Drago Ferrante ◽  
A. Aloise ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Acid Sites ◽  
Co2 Hydrogenation ◽  
Dme Synthesis ◽  
Hybrid Catalysts

Hydrocarbon synthesis through CO2 hydrogenation over CuZnOZrO2/zeolite hybrid catalysts

1998 ◽  
Vol 44 (1-4) ◽  
pp. 165-173 ◽  
Author(s):  
Young-Kwon Park ◽  
Kwang-Cheon Park ◽  
Son-Ki Ihm
Keyword(s):  
Co2 Hydrogenation ◽  
Hydrocarbon Synthesis ◽  
Hybrid Catalysts
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