Hydrogen storage for stationary and mobile applications is an expanding research topic. One of the more promising hydrogen techniques relies on reversibility high selectivity liquid organic hydrides, in particular, methylcyclohexane (MCH). The use hydrides also provides gravimetric volumetric density, low potential risk, capital investment because it largely compatible with current transport infrastructure. Despite its technical, economical, environmental advantages, concept carriers has not...

Three vacuum residual oils (VR) derived from Ratawi Burgan (RB), Lower Fars (LF), and Eocene (EOC) crude were subjected to thermal cracking in a pilot plant, which simulates the Eureka process, produce cracked distillate petroleum products pitch. The reaction was performed at 430 °C for 50 min. chemical composition of produced byproduct pitch studied determine its relationship variations properties feedstock. Saturates, aromatics, resins asphaltenes (SARA) analysis residues, oils, show that...

The main objective of this work is to determine the effect thermal cracking on asphaltene molecular structure by using nuclear magnetic resonance (NMR). NMR used identify and quantify structural parameters functional groups, which subsequently helped in deriving a hypothetical average for molecules. analysis revealed number valuable findings developed better understanding about nature changes that molecules undergo during vacuum residues (VRs). For instance, polyaromatic parent VRs consists...

The main objective of this study is to provide an in-depth analysis that reveals the impact thermal treatment on different functional groups exist in asphaltene molecules. This contribution important further understand nature changes take place asphaltenes during distillation and cracking processes. A slight increase was observed aromatic −CH groups, compared aliphatic as crude oil processed atmospheric vacuum residues. decrease also intensity ratio between methylene methyl (CH2/CH3) with...

Various kinetic models were developed for methylcyclohexane (MCH) dehydrogenation over supported Pt catalysts. The best fitting mechanistic model is of the non-Langmuirian/noncompetitive Horiuti−Polanyi type. In this model, aromatic hydrogenation mechanism, which assumes an atomic hydrogen addition to aromatics on catalyst surface, applied in reverse MCH dehydrogenation. also that and molecules adsorb noncompetitively two different types sites accommodate observed near zero-order dependence...

The primary objective of this work is to study the hydrocracking associated with hydrotreatment atmospheric residue (AR) feedstock and develop a kinetic model describing undergoing cracking reactions. Experimental data were obtained for three types conventional hydrotreating catalysts [hydrodesulfurization (HDS), hydrodemetalization (HDM), hydrodenitrogenation (HDN)] at space velocities operating temperatures. developed based on continuous lumping approach, which assumes concentration...

The kinetics of methylcyclohexane (MCH) dehydrogenation over supported Pt catalysts was successfully described by a non-Langmuirian/noncompetitive Horiuti−Polanyi model (Ind. Eng. Chem. Res., in press). daily reversible and irreversible deactivation, associated with activity tests, satisfactorily included the model. objective this work is to incorporate long-term deactivation catalysts, life or kinetic This has been achieved assuming that sum two exponential decay processes, one rapid...

The impact of thermal cracking reaction on asphaltene structure and morphology has been investigated by using scanning electron microscopy (SEM) transmission (TEM). structural morphological changes at a microscopic level were monitored comparing the parent asphaltenes from different vacuum residues (VRs) to their corresponding thermally treated asphaltenes, obtained by-product pitch after treatment. SEM analysis indicated that aggregates extracted atmospheric have smooth rough surfaces with...

Thermogravimetric analysis (TGA) was employed to investigate the thermal stability of asphaltenes at different environments (inert and oxidizing atmosphere) identify their refractory nature. TGA differential scanning calorimetry were carried out a temperature range 50-700 °C, for asphaltene samples obtained from atmospheric residues, vacuum residues (VRs), aromatic petroleum pitch samples, which cracking VRs temperatures. The results clearly indicate that degradation takes place in single...

Abstract The experimental data of six different types Pt‐containing alumina catalysts are used to study the detailed and rigorous kinetics methylcyclohexane dehydrogenation reaction. A large number kinetic rate equations were formulated using power law Langmuir‐Hinshelwood‐Hougen‐Watson (LHHW) kinetics, which tested against data. For each catalyst, elementary reaction step “the loss first molecular hydrogen” in LHHW single‐site surface mechanism was observed be rate‐determining step. form...

A method for synthesizing graphene derivatives from asphaltene is proposed in this work. The are mainly composed of few-layer graphene-like nano-sheets randomly distributed heteroatoms; sulfur and nitrogen. based on a thermal treatment which carbonized rotating quartz-tube furnace under an inert atmosphere at temperature the range 400-950 °C. Asphaltenes different origins were employed to verify synthesis method. results indicate that obtained high carbonization have similar structural...

The objective of this research is to develop catalysts for residue hydrocracking that can enhance the yield middle distillates. support compositions were tailored achieve optimal textural properties and desired acidic function, catalyst hydrogenation function (i.e., active metal, promoter, their composition) was chosen attain required hydrotreating activity. supports synthesized by incorporating amorphous crystalline SiO2 in porous Al2O3. catalysts, on other hand, prepared coimpregnating...