scholarly journals Things go better with coke: the beneficial role of carbonaceous deposits in heterogeneous catalysis

2016 ◽  
Vol 6 (2) ◽  
pp. 363-378 ◽  
Author(s):  
C. H. Collett ◽  
J. McGregor
Keyword(s):  
Heterogeneous Catalysis ◽  
Heterogeneous Catalysts ◽  
Catalyst Deactivation ◽  
Catalytic Performance ◽  
Fischer Tropsch ◽  
Carbonaceous Deposits ◽  
Beneficial Role ◽  
Catalytic Processes

Carbonaceous deposits on heterogeneous catalysts are traditionally associated with catalyst deactivation. However, they can play a beneficial role in many catalytic processes, e.g. dehydrogenation, hydrogenation, alkylation, isomerisation, Fischer–Tropsch, MTO etc. This review highlights the role and mechanism by which coke deposits can enhance catalytic performance.

scholarly journals Designing Heterogeneous Catalysts for Renewable Catalysis Applications Using Metal Oxide Deposition

2019 ◽  
Vol 73 (9) ◽  
pp. 698-706
Author(s):  
Yuan-Peng Du ◽  
Jeremy S. Luterbacher
Keyword(s):  
Heterogeneous Catalysis ◽  
Metal Oxide ◽  
Active Sites ◽  
Heterogeneous Catalysts ◽  
Catalyst Deactivation ◽  
High Surface ◽  
Catalyst Stability ◽  
Synthetic Control ◽  
High Oxygen Content ◽  
Oxide Deposition

Heterogeneous catalysis has long been a workhorse for the chemical industry and will likely play a key role in the emerging area of renewable chemistry. However, renewable molecule streams pose unique challenges for heterogeneous catalysis due to their high oxygen content, frequent low volatility and the near constant presence of water. These constraints can often lead to the need for catalyst operation in harsh liquid phase conditions, which has compounded traditional catalyst deactivation issues. Oxygenated molecules are also frequently more reactive than petroleum-derived molecules, which creates a need for highly selective catalysts. Synthetic control over the nanostructured environment of catalytic active sites could facilitate the creation of both more stable and selective catalysts. In this review, we discuss the use of metal oxide deposition as an emerging strategy that can be used to synthesize and/or modify heterogeneous catalysts to introduce tailored nanostructures. Several important applications are reviewed, including the synthesis of high surface area mesoporous metal oxides, the enhancement of catalyst stability, and the improvement of catalyst selectivity.

Fischer-Tropsch synthesis nanostructured catalysts: understanding structural characteristics and catalytic reaction

2013 ◽  
Vol 2 (5) ◽  
pp. 547-576 ◽  
Author(s):  
Peng Zhai ◽  
Geng Sun ◽  
Qingjun Zhu ◽  
Ding Ma
Keyword(s):  
Structural Characteristics ◽  
Nanostructured Catalysts ◽  
Catalytic Performance ◽  
Tropsch Synthesis ◽  
Fischer Tropsch ◽  
Reaction Conditions ◽  
Catalyst Structure ◽  
Fischer Tropsch Synthesis

AbstractOne key goal of heterogeneous catalysis study is to understand the correlation between the catalyst structure and its corresponding catalytic activity. In this review, we focus on recent strategies to synthesize well-defined Fischer-Tropsch synthesis (FTS) nanostructured catalysts and their catalytic performance in FTS. The development of those promising catalysts highlights the potentials of nanostructured materials to unravel the complex and dynamic reaction mechanism, particularly under the in situ reaction conditions. The crucial factors associated with the catalyst compositions and structures and their effects on the FTS activities are discussed with an emphasis on the role of theoretical modeling and experimental results.

A comprehensive insight into the role of barium in catalytic performance of Co/Al2O3 catalyst for Fischer-Tropsch synthesis

Fuel ◽  
2019 ◽  
Vol 256 ◽  
pp. 115911 ◽  
Author(s):  
Shupeng Guo ◽  
Qiang Wang ◽  
Min Wang ◽  
Zhongyi Ma ◽  
Jungang Wang ◽  
...  
Keyword(s):  
Catalytic Performance ◽  
Tropsch Synthesis ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis ◽  
Al2o3 Catalyst ◽  
Insight Into

scholarly journals Catalytic partial oxidation of methane to syngas over perovskite catalysts

2019 ◽  
Vol 90 ◽  
pp. 01006
Author(s):  
Tan Ji Siang ◽  
Aishah Abdul Jalil ◽  
Hambali Umar Hambali ◽  
Ijaz Hussain ◽  
Azami Mohammad Saifulddin bin Mohd
Keyword(s):  
Partial Oxidation ◽  
Catalyst Deactivation ◽  
Catalyst System ◽  
Catalytic Performance ◽  
Partial Oxidation Of Methane ◽  
Oxidation Of Methane ◽  
Process Chemistry ◽  
Perovskite Catalysts ◽  
Novel Catalyst

Partial oxidation of methane (POM) significantly offers benefits to the industrial production of syngas in comparison with other conventional processes in terms of hydrogen (H2)/carbon monoxide (CO) ratio and degree of catalyst deactivation induced by carbonaceous species. Thus, the increasing concern on commercialisation of POM technology has driven the catalyst system to enter another stage of developing a novel catalyst, namely perovskite. POM is comprehensively reviewed and compared with various perovskite catalysts. Apart from studying process chemistry to understand POM reaction, the role of metal types for perovskite structure on catalytic performance and coke selectivity are also scrutinised and summarised. Additionally, the comprehension of POM pathways and the corresponding pictorial depiction are discussed and provided in this paper.

The role of SiOxCy in the catalytic performance of Co/SiC catalysts for Fischer-Tropsch synthesis

Fuel ◽  
2019 ◽  
Vol 241 ◽  
pp. 669-675 ◽  
Author(s):  
Min Wang ◽  
Shupeng Guo ◽  
Zhiwen Li ◽  
Zhongyi Ma ◽  
Jungang Wang ◽  
...  
Keyword(s):  
Catalytic Performance ◽  
Tropsch Synthesis ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis

scholarly journals Electrochemical promotion of catalysis (EPOC): Perspectives for application to gas emissions treatment

2013 ◽  
Vol 10 (2) ◽  
pp. 226-236
Keyword(s):  
Heterogeneous Catalysis ◽  
Heterogeneous Catalysts ◽  
Catalyst Deactivation ◽  
Supported Catalysts ◽  
Life Time ◽  
Cost Effective ◽  
Electrochemical Promotion ◽  
Gas Emissions ◽  
Simultaneous Control ◽  
Electrochemical Promotion Of Catalysis

Heterogeneous Catalysis and Electrocatalysis can be used very effectively on air pollution control. Air emissions coming either from mobile sources or from stationary sources, including volatile organic emissions, nitrogen oxides, hydrocarbons and carbon monoxide could be well converted to harmless non-pollutants at reasonable temperatures with cost-effective systems utilizing heterogeneous catalysis and suitable catalysts. Some of the disadvantages of conventional heterogeneous catalysts are the high production cost (since most of them are metal supported catalysts), the short life time (due to the catalyst deactivation) and the weakness to control their activity during the catalytic process. A new phenomenon of Solid State Electrochemistry called Electrochemical Promotion of Catalysis (EPOC) combined with classical heterogeneous catalysis could be applied in order to overcome some of the above problems. In this paper we are trying to show with characteristic examples how EPOC could be useful in environmentally important reactions (oxidations, reductions, etc). The results show that EPOC reveals great perspectives in environmental issues and especially in gas emissions treatment technology. The utilization of EPOC could be really useful since we can increase the catalytic activity, alter the selectivity to the desirable products and simultaneous control the reaction rate during a given electrocatalytic process.

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