Topic
Carbochemistry
About: Carbochemistry is a research topic. Over the lifetime, 1010 publications have been published within this topic receiving 16626 citations.
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TL;DR: In this paper, it was shown that pyrolysis of the methane quite independently of the coal, except with the possible catalysis by coal, coke or mineral matter in the coal ash.
26 citations
TL;DR: In this paper, a simple particle model is used to interpret differential thermogravimetric data taken on the gasification of coal/char with CO2, H2 and H2O.
Abstract: A simple particle model is used to interpret differential thermogravimetric data taken on the gasification of coal/char with CO2, H2 and H2O. The model takes into account the major physical factors which influence the gasification rate, viz., the changing magnitudes of surface area, porosity, activation energy and effective diffusivity during gasification. Specific reaction rate constants based on surface area and activation energies are extracted from the data. Practical criteria for regimes of reaction rate and diffusion control and for particle isothermality are developed. For isothermal particles at low classical Thiele moduli, the data can be correlated with only one parameter, which has a simple physical interpretation.
26 citations
TL;DR: In this paper, the kinetics of oxygen removal reactions and total hydrocarbon conversion were studied during supercritical water and toluene extraction of a subbituminous coal, and the results correlated well with a second-order kinetic model.
Abstract: The kinetics of oxygen removal reactions and total hydrocarbon conversion were studied during supercritical water and toluene extraction of a subbituminous coal. The results from both water and toluene extractions correlated well with a second-order kinetic model. Comparisons were made between water and toluene extractions in terms of possible mechanistic pathways for aqueous and organic supercritical fluid reactions with coal. Supercritical water consistently gave higher hydrocarbon conversions and oxygen removal than supercritical toluene. The changes in the enthalpies of activation with degrees of completion suggest suggest that, in addition to pyrolysis, other bond rupture reactions, most likely hydrolysis, contribute to total conversion and oxygen removal during supercritical water extraction of coal
26 citations
TL;DR: In this paper, the tetrahydrofuran (THF) solubles were converted to tetrahedral tetrahedroquinoline (THQ), quinoline or tetralin.
26 citations
TL;DR: In the absence of poisons such as sulphur, arsenic, phosphorous, and heavy metals, the major way in which the catalyst loses activity is due to accumulation of carbonaceous residues on its surface as mentioned in this paper.
Abstract: One of the most interesting and intriguing topics in the field of heterogeneous catalysis is the mechanism by which metallic particles influence the gasification of graphite. The gasification of carbon by oxidizing gases is often the limiting factor in the performance of graphite structures at high temperatures. Currently, one of the most important areas involves the function of metals in the removal of carbonaceous deposits from spent catalysts and steam cracker tubes. Supported metal catalysts are employed in a variety of commercial hydrocarbon conversion processes. Such catalysts consist, in general, of small metal crystallites (0.5 to 2.5 nm diameter) dispersed on nonmetallic oxide supports. In the absence of such poisons as sulphur, arsenic, phosphorous, and heavy metals, the major way in which the catalyst loses activity is due to accumulation of carbonaceous residues on its surface. Catalyst regeneration is usually achieved by gasification of the deposit in an oxidizing environment at about 500°C. The efficiency of this process is variable and so there is an increasing demand to learn more about the process so that gasification can be optimized.
26 citations