scholarly journals Effect of loading sequence between Cu and Fe on SCR-C3H6 performance for Al-PILC based bimetallic catalysts

2021 ◽  
Vol 2079 (1) ◽  
pp. 012009
Author(s):  
Nini Wen ◽  
Jianghao Cheng ◽  
Yaxin Su ◽  
Mingtao Hu ◽  
Wenyi Deng ◽  
...  
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Bimetallic Catalysts ◽  
Active Phase ◽  
Adsorbed Oxygen ◽  
No Conversion ◽  
Loading Sequence

Abstract To investigate the effect of impregnation sequence on SCR-C3H6 performance, Al-PILC based catalysts with different impregnation sequences between Cu and Fe were prepared. Activity result showed that impregnation sequence influenced the SCR-C3H6 performance, where, the NO conversion followed the order from high to low: Cu-Fe/Al-PILC>FeCu/Al-PILC>CuFe/Al-PILC. XRD results indicated that the dispersion of the active phase was related to the impregnation sequence. The specific surface area was not the crucial factor affecting the activity. UV-Vis demonstrated that isolated Cu2+ and Fe3+ contributed to activity rather than CuO and Fe2O3 particles, and more isolated Cu2+ and Fe3+ existed on Cu-Fe/Al-PILC. H2-TPR and XPS results revealed that superior reduction ability and more surface adsorbed oxygen led to the excellent SCR-C3H6 performance for Cu-Fe/Al-PILC catalyst.

scholarly journals Oxidative processing of propane into important petrochemical products on deposited vanadium catalysts

2019 ◽  
pp. 12-18
Author(s):  
Gulnar Kaumenova ◽  
Rabiga Sarsenova ◽  
Banu Kazhdenbek ◽  
Damir Abdyhalykov ◽  
Zauresh Zheksenbaeva ◽  
...  
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Active Phase ◽  
Vanadium Catalyst ◽  
Oxidative Conversion ◽  
Vanadium Catalysts ◽  
Petrochemical Products

The paper presents the data on activity of the deposited catalyst based on vanadium. The developed catalyst allows conducting the process of oxidative conversion of propane into ethylene and hydrogen using CO2 as an oxidant. The study of the activity of the developed vanadium catalyst at the oxidative conversion of propane showed that the maximum ethylene yield was 24.5% at: C3H8:CO2=2:1, T=700°C and W=1000 h-1. The increase of temperature to 800°C resulted in the in formation of 27.5% hydrogen. By methods of BET and XRD the developed catalyst 5% V/Al2O3, is differed by increase of specific surface area and bonding of the carrier with active phase, contributing to increase of efficiency of the developed catalyst in the oxidative conversion of propane to ethylene and hydrogen.

Metal Oxides (such as Al2O3 and TiO2) as Catalyst Supports for Hydrogen Release by Hydrolysis of Sodium Borohydride NaBH4

2010 ◽  
Vol 65 ◽  
pp. 209-214
Author(s):  
Ouardia Akdim ◽  
Umit Bilge Demirci ◽  
Philippe Miele
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Supported Catalysts ◽  
High Surface ◽  
High Surface Area ◽  
Active Phase ◽  
Hydrogen Release ◽  
Catalytic Systems ◽  
Hydrolysis Of

Hydrolysis of NaBH4 to release molecular hydrogen is today an intensely investigated reaction and most of the studies focus on the material used as catalyst. Among the various metals tested up to now, cobalt has soon showed to be the most attractive in terms of reactivity and cost. Nevertheless, in order to further decrease its cost by decreasing its amount as well as to increase its reactivity, cobalt has been dispersed over supports. The as-formed supported catalysts have showed to be more efficient. This is the topic of the present study. Herein it is showed that CoCl2 supported over an Al2O3 support with a specific surface area of 180 m2 g-1 is more reactive than CoCl2 supported over a high-surface-area activated carbon (780 m2 g-1), CoCl2 being in-situ reduced into the Co-based active phase. CoCl2-Al2O3 is besides as reactive as another CoCl2-Al2O3 catalyst, the latter support having a higher specific surface area (i.e. 250 m2 g-1). In fact, CoCl2-Al2O3 is more performing than neat CoCl2 whereas the latter has been often showed as being one of the best catalytic systems. To further gain in reactivity, a new, alternative strategy has been envisaged. The Al2O3 was mixed together with a controlled amount of another oxide, namely TiO2. The CoCl2- Al2O3-TiO2(20 wt%) was found to be more reactive than CoCl2-Al2O3. All of these reactivity data are reported and briefly discussed hereafter. Further studies are in progress to highlight the reasons of such improved reactivity.

Fuels Desulphurisation by Adsorbtion on Fe / Bentonite

2017 ◽  
Vol 68 (3) ◽  
pp. 483-486
Author(s):  
Constantin Sorin Ion ◽  
Mihaela Bombos ◽  
Gabriel Vasilievici ◽  
Dorin Bombos
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Pore Volume ◽  
Pore Diameter ◽  
Adsorption Process ◽  
Continuous System ◽  
Gas Oil ◽  
Average Pore ◽  
Atmospheric Distillation

Desulfurisation of atmospheric distillation gasoline and gas oil was performed by adsorption process on Fe/ bentonite. The adsorbent was characterized by determining the adsorption isotherms, specific surface area, pore volume and average pore diameter. Adsorption experiments of atmospheric distillation gasoline and gas oil were performed in continuous system at 280�320oC, 5 atm and volume hourly space velocities of 1�2 h-1. The efficiency of adsorption on Fe / bentonite was better at desulphurisation of gasoline versus gas oil.

scholarly journals Nanoporous Quasi-High-Entropy Alloy Microspheres

Metals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 345 ◽  
Author(s):  
Lianzan Yang ◽  
Yongyan Li ◽  
Zhifeng Wang ◽  
Weimin Zhao ◽  
Chunling Qin
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
High Specific Surface Area ◽  
High Entropy Alloy ◽  
Face Centered Cubic ◽  
High Entropy ◽  
Hierarchical Porous

High-entropy alloys (HEAs) present excellent mechanical properties. However, the exploitation of chemical properties of HEAs is far less than that of mechanical properties, which is mainly limited by the low specific surface area of HEAs synthesized by traditional methods. Thus, it is vital to develop new routes to fabricate HEAs with novel three-dimensional structures and a high specific surface area. Herein, we develop a facile approach to fabricate nanoporous noble metal quasi-HEA microspheres by melt-spinning and dealloying. The as-obtained nanoporous Cu30Au23Pt22Pd25 quasi-HEA microspheres present a hierarchical porous structure with a high specific surface area of 69.5 m2/g and a multiphase approximatively componential solid solution characteristic with a broad single-group face-centered cubic XRD pattern, which is different from the traditional single-phase or two-phase solid solution HEAs. To differentiate, these are named quasi-HEAs. The synthetic strategy proposed in this paper opens the door for the synthesis of porous quasi-HEAs related materials, and is expected to promote further applications of quasi-HEAs in various chemical fields.

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