Effects of Natural Dolomite Catalysts on Cracking Anthracene Oil

Abstract

Natural dolomite catalysts, representing a cheap and environmentally friendly alternative to nickel-based compounds, can be used for the cracking of anthracene oil to form more valuable products. The impact of operating conditions (temperature, water/oil mass ratio, and space velocity) on the distribution and yield of pyrolysis products was investigated in a fixed-bed reactor, providing insights into the mechanism of cracking. The gaseous products were analyzed by gas chromatography; the catalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy; and the pyrolysis oil was analyzed by gas chromatography–mass spectrometry. The obtained results revealed that the gaseous products comprised H2, CO, CO2, CH4, and C2+. In comparison to anthracene oil, the pyrolysis oil contained significantly decreased amounts of alkyl aromatic hydrocarbons and indene compounds as well as an increased content of polycyclic aromatic hydrocarbons, such as naphthalene and phenanthrene. XRD and SEM analyses revealed granular coke deposition on the catalyst surface at a high temperature accompanied by partial conversion of the catalyst to CaCO3, which could be mitigated using high water/oil ratios. Thus, this study demonstrated the influence of reaction conditions on natural-dolomite-catalyzed cracking of anthracene oil, which is important for optimizing industrial production processes.

Study on Sulfur Conversion Characteristics in Catalytic Cracking of Coal Tar in the Presence of Dolomite-Supported Catalysts

“…It is generally believed that catalytic cracking technology is very suitable for the upgrading of coal tar and achieved good results. 3 However, coal tar contains some sulfur-containing compounds such as thiol, thioether, disulfide, thiophene, and 1-benzothiophene, and so forth. These sulfur-containing pollutants are prone to cause catalyst poisoning or even permanent deactivation during catalytic cracking of coal tar.…”

“…This is not conducive to the efficient cleaning and utilization of tar. It is generally believed that catalytic cracking technology is very suitable for the upgrading of coal tar and achieved good results . However, coal tar contains some sulfur-containing compounds such as thiol, thioether, disulfide, thiophene, and 1-benzothiophene, and so forth.…”

An Effective Approach for Separating Carbazole and Its Derivates from Coal-Tar-Derived Anthracene Oil Using Ionic Liquids

“…The compounds derived from anthracene oil (AO) have the potential to be significant contributors for obtaining high-grade electrode materials and value-added chemicals (VACs) . AO is a mixture obtained by distilling coal tar, which mainly consists of condensed arenes with 2–5 aromatic rings . Carbazole, mainly derived from coal tars, is an important nitrogen-containing organic compound (NCOC) for chemical production.…”

Study on Modification and Sulfur-Resistance Characteristics of Dolomite Catalysts over Wash Oil Catalytic Cracking

“…However, there is more heavy tar in cracked oil after dolomite cracking although its amount is decreased compared to raw oil. Liang et al 16 discovered that anthracene oil got higher C/H and became more condensed through natural dolomite cracking. Moreover, dolomite catalysts have low mechanical strength and reactivity, and this problem is still a nodus in industrial production.…”