Novel bimetallic 1%M-Fe/Al2O3-Cr2O3 (2:1) (M = Ru, Au, Pt, Pd) catalysts for Fischer-Tropsch synthesis

The main objective of this work was to study the physicochemical and catalytic properties of bimetallic supported catalysts [1%M-Fe/Al2O3-Cr2O3 (2:1) (M = Ru, Au, Pt, Pd)] in Fischer-Tropsch synthesis. Furthermore, the study investigated the effect of noble metal addition to iron-supported catalysts on their physicochemical properties and reactivity. The physicochemical properties of the catalysts were studied using a range of characterization techniques such as X-ray diffraction (XRD), temperature-programmed reduction (TPR-H2), temperature-programmed desorption of ammonia (TPD-NH3) and BET (Brunauer – Emmett - Teller method). The activity tests were performed by Fischer-Tropsch synthesis in a high-pressure fixed-bed reactor using a gas mixture of H2 and CO with a molar ratio of 1:1. The correlation between the physicochemical properties of the investigated catalysts and their catalytic performance in CO hydrogenation was also investigated. The reactivity results showed that the most active system exhibited a high specific surface area, the highest total acidity and was the most reducible catalyst compared to the other catalysts tested. In addition, the Au–Fe system showed high selectivity towards liquid product formation during CO hydrogenation

Plasma-assisted catalysis for CH4 and CO2 conversion

This paper presents a critical review of recent advances in the processes of converting CO2 and CH4 gases into fine chemicals using plasma-assisted catalysis. The general principles of plasma-catalytic processes are summarized, presenting schematics and operation principles of typical plasma reactors for applications in catalysis. The applications of plasma in various catalytic CO2 and/or CH4 conversion processes are discussed and the advantages of using plasma in catalysis compared to traditional thermal processes are highlighted. Among all the plasma reactors presented in the review, the use of the DBD reactor for CO2 and CH4 conversion is described in detail due to its simplicity, possible configuration changes, easy catalyst replacement and its mild operating conditions during the process compared to other types of plasma reactors. The paper presents also the postulated reaction paths and a comparison of the efficiency and the selectivities obtained during the dry reforming of methane process using various type of reactors. Current challenges and outlook for plasma-assisted catalytic processes are also presented.</p

The Influence of Si/Al Ratio on the Physicochemical and Catalytic Properties of MgO/ZSM-5 Catalyst in Transesterification Reaction of Rapeseed Oil

This work presents the comparative physicochemical and catalytic studies of metal oxide MgO catalysts in a transesterification reaction. The influence of the Si/Al ratio in the catalytic material on their catalytic properties in the studied process was extensively evaluated. In addition, the effect of the type of zeolite ZSM-5 form on the catalytic reactivity of MgO based catalysts was investigated. In order to achieve the main goals of this work, a series of MgO/ZSM-5 catalysts were prepared via the impregnation method. Their physicochemical properties were studied using X-ray diffraction (XRD), BET, FTIR and TPD-CO2 methods. The highest activity in the studied process exhibited MgO catalyst supported on ZSM-5 characterized by the highest ratio between silica and alumina. The most active catalyst system in the transesterification reaction was 10% MgO/ZSM-5 (Si/Al = 280), which showed the highest value of higher fatty acid methyl esters (94.6%) and high yield of triglyceride conversion (92.9%). The high activity of this system is explained by the alkalinity, sorption properties in relation to methanol and its high specific surface area compared to the rest of the investigated MgO based catalysts

Plasma-assisted catalysis for CH4 and CO2 conversion

This paper presents a critical review of recent advances in the processes of converting CO2 and CH4 gases into fine chemicals using plasma-assisted catalysis. The general principles of plasma-catalytic processes are summarized, presenting schematics and operation principles of typical plasma reactors for applications in catalysis. The applications of plasma in various catalytic CO2 and/or CH4 conversion processes are discussed and the advantages of using plasma in catalysis compared to traditional thermal processes are highlighted. Among all the plasma reactors presented in the review, the use of the DBD reactor for CO2 and CH4 conversion is described in detail due to its simplicity, possible configuration changes, easy catalyst replacement and its mild operating conditions during the process compared to other types of plasma reactors. The paper presents also the postulated reaction paths and a comparison of the efficiency and the selectivities obtained during the dry reforming of methane process using various type of reactors. Current challenges and outlook for plasma-assisted catalytic processes are also presented

Synthesis, Spectroscopic, Thermal and Catalytic Properties of Four New Metal (II) Complexes with Selected N- and O-Donor Ligands

Four solid compounds with formulae: Co(OAc)2(Im)&middot;H2O (I), Ni(OAc)2(Im)1.5&middot;2H2O (II), Cu2(OAc)4(Im) (III) and Zn(OAc)2(Im)&middot;H2O (IV) (where: Im = 1H-Imidazole) were prepared and characterized by chemical and elemental analysis, powder X-ray diffraction patterns and FTIR spectroscopy. Catalytic properties of each complex for styrene oxidation reaction were investigated. Furthermore, thermal properties of compounds were studied using the TG-DTG and DSC techniques under dry air atmosphere. Additionally, volatile thermal decomposition and fragmentation products were also investigated using the TG-FTIR spectra in air