scholarly journals Biosynthesized Ag/α-Al2O3 catalyst for ethylene epoxidation: the influence of silver precursors

RSC Advances ◽  
2014 ◽  
Vol 4 (52) ◽  
pp. 27597-27603 ◽  
Author(s):  
Xiaolian Jing ◽  
Huixuan Wang ◽  
Huimei Chen ◽  
Jiale Huang ◽  
Qingbiao Li ◽  
...  
Keyword(s):  
Surface State ◽  
Catalytic Performance ◽  
Ethylene Epoxidation ◽  
Ammonia Complex ◽  
Ethylenediamine Complex ◽  
Structure Surface ◽  
Α Al2o3 ◽  
Ag Catalyst ◽  
Al2o3 Catalyst

The catalytic performance of biosynthesized Ag/α-Al2O3 catalysts was strongly affected by silver precursors. Ag catalyst prepared from silver–ethylenediamine complex showed a better activity for ethylene epoxidation than catalysts from AgNO3 and silver–ammonia complex. The influence of silver precursors on the structure, surface state, oxidation property of the catalysts was investigated.

Effect of Ba on the catalytic performance of Co-Ru/Al2O3 catalyst for Fischer-Tropsch synthesis

Fuel ◽  
2021 ◽  
Vol 292 ◽  
pp. 120398
Author(s):  
Shupeng Guo ◽  
Zhongyi Ma ◽  
Jungang Wang ◽  
Bo Hou ◽  
Litao Jia ◽  
...  
Keyword(s):  
Catalytic Performance ◽  
Tropsch Synthesis ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis ◽  
Al2o3 Catalyst

scholarly journals Influence of incorporating a small amount of silica on the catalytic performance of a MoO3/Al2O3 catalyst in ethanol oxidative dehydrogenation

2018 ◽  
Vol 16 (6) ◽  
Author(s):  
Aline Villarreal ◽  
Gabriella Garbarino ◽  
Paola Riani ◽  
Aida Gutiérrez Alejandre ◽  
Jorge Ramírez ◽  
...  
Keyword(s):  
Oxidative Dehydrogenation ◽  
Active Sites ◽  
Catalytic Performance ◽  
Redox Behavior ◽  
Acid Base ◽  
Pure Alumina ◽  
Molybdenum Catalyst ◽  
Al2o3 Catalyst ◽  
Dehydrogenation Of Ethanol

The influence of incorporating a small amount of silica on the catalytic performance of MoO3/Al2O3 catalyst was studied. Molybdenum supported on pure alumina and 5% SiO2-Al2O3 supports were synthesized. The catalysts were characterized by XRD, Raman, UV-Vis and IR spectroscopies, FE-SEM microscopy, and their activity was evaluated in the oxidative dehydrogenation of ethanol to acetaldehyde. Molybdenum supported on pure alumina gives a 74% yield to acetaldehyde (at 573 K) due to the generation of oxy-dehydrogenation active sites by molybdenum and to the decrement of the alumina dehydration sites. For the molybdenum catalyst supported on silica-containing alumina, the molybdenum species were displaced from the strongest alumina’s acid-base couples, located on nanoparticles edges, corners and defects, to weaker ones located on plane faces causing the rise of weakly bonded species with less active redox behavior.  

scholarly journals Research on Catalytic Denitrification by Zero-Valent Iron (Fe0) and Pd-Ag Catalyst

2021 ◽  
Author(s):  
Yu Zhou ◽  
Yupan Yun ◽  
Xueyou Wen
Keyword(s):  
Response Surface Methodology ◽  
Catalytic Performance ◽  
Zero Valent Iron ◽  
Optimal Conditions ◽  
Single Factor ◽  
Condition Optimization ◽  
Performance Response ◽  
Real Wastewater ◽  
Ag Catalyst ◽  
Orthogonal Tests

Abstract This study primarily focused on how to effectively remove nitrate by catalytic denitrification through zero-valent iron (Fe0) and Pd-Ag catalyst. In order to get better catalytic performance, response surface methodology (RSM), instead of the single factor experiments and orthogonal tests, was firstly applied to optimize the condition parameters of the catalytic process. Results indicated that RSM is accurate and feasible for the condition optimization of catalytic denitrification. Better catalytic performance (71.6% N2 Selectivity) was obtained under the following conditions: 5.1 pH, 127 min reaction time, 3.2 mass ration (Pd: Ag), and 4.2 g/L Fe0, which was higher than the previous study designed by the single factor experiments (68.1%) and orthogonal tests (68.7%). However, under the optimal conditions, N2 selectivity showed a mild decrease (69.3%), when the real wastewater was used as the influent. Further study revealed that the cations (e.g., K+, Na+, Ca2+, Mg2+, and Al3+) and anions (e.g., Cl-, HCO3-, and SO42-) exist in wastewater may have distinctive influence on N2 selectivity. Finally, the reaction mechanism and kinetic model of catalytic denitrification were further studied.

scholarly journals DRIFTS study of Fe promoter effect on Rh/Al2O3 catalyst for C2 oxygenates synthesis from syngas

2019 ◽  
Vol 9 (3-4) ◽  
pp. 211-219
Author(s):  
Fang Li ◽  
Weixing Qian
Keyword(s):  
Co Adsorption ◽  
Catalytic Performance ◽  
Desorption Rate ◽  
Hydrogenation Activity ◽  
Promoter Effect ◽  
Fe Content ◽  
Adsorbed Co ◽  
Key Steps ◽  
Performance Results ◽  
Al2o3 Catalyst

Abstract DRIFTS experiments such as CO adsorption, CO-TPSR and CO+H2 were designated to study the effect of Fe promoter on the key steps of C2 oxygenates formation from syngas. The CO adsorption results demonstrated that Fe weakened CO adsorption and especially the bridging adsorption. It was found in CO-TPSR experiments that the catalyst with lower Fe loading is more easily dissociated while the ones with higher Fe loading own stronger hydrogenation activity. Moreover, it was observed by CO+H2 experiments that Fe plays a role in stabilizing the lineally adsorbed CO species and decreasing the CO desorption rate. The catalytic performance results indicated that when Fe content is 4wt. %, the selectivity of total C2 oxygenates is the highest, which was in accordance with the DRIFTS results.

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