Synthesis Of Light Hydrocarbons Research Articles

Synthesis of Light Hydrocarbons from Biogas and Hydrogen: Investigation of a Fe‐Mn‐K/MgO Catalyst

Synthesis of Light Hydrocarbons from Biogas and Hydrogen: Investigation of a Fe‐Mn‐K/MgO Catalyst

Front Cover: Plasma‐Assisted Catalytic Effects of TiO2/Macroporous SiO2 on the Synthesis of Light Hydrocarbons from Methane (ChemCatChem 20/2020)

Front Cover: Plasma‐Assisted Catalytic Effects of TiO₂/Macroporous SiO₂ on the Synthesis of Light Hydrocarbons from Methane (ChemCatChem 20/2020)

Plasma‐Assisted Catalytic Effects of TiO2/Macroporous SiO2 on the Synthesis of Light Hydrocarbons from Methane

AbstractValuable light hydrocarbons such as ethane, propane, butane and corresponding olefins were successfully synthesized using a plasma‐assisted catalytic system. The catalytic activity of titania nanoparticles seemed to selectively increase the conversion of intermediates into longer C5+ hydrocarbons, while suppressing the dehydrogenation of intermediates to coke. In addition, DFT calculations revealed that the intermediate hydrocarbon radicals on titania active sites seemed to prefer to form longer hydrocarbons rather than coke in terms of dehydrogenation energy and relative adsorption energy. In addition, the proper selection of support material in terms of dielectric constant, particle size, and pore size could greatly improve the selectivity toward saturated light hydrocarbons. The fraction of saturated hydrocarbons in C2–C4 was measured over 80 %. By adopting macroporous silica with a large pore size, the required bed weight was appreciably reduced, without compromising performance.

Synthesis of Light Hydrocarbons from Biogas and Hydrogen: Investigation of a Fe‐Mn‐K/MgO Catalyst

AbstractFischer‐Tropsch synthesis of the CO2 in biogas aims at producing light hydrocarbons and increasing its calorific value for feeding into the grid. Fe catalysts with Mn and K as promoters are supposed to yield high amounts of light hydrocarbons. Using a Fe‐Mn‐K/MgO catalyst, a parameter screening and long‐term experiments were carried out. The catalyst shows, within the examined range, the highest selectivity to C2–C4 hydrocarbons at 450 °C, 8 bar(a), and a gas hourly space velocity of 350 h−1. Calcination of the catalyst resulted in a significant drop of activity and an almost complete loss of selectivity to hydrocarbons. Admixture of steam to the reactant gas lowers the tendency to carbon deposition but also promotes the water‐gas shift reaction and results in lower yields of hydrocarbons.

Synthesis of Light Hydrocarbons via Oxidative Coupling of Methane over Silica-supported Na2WO4-TiO2 Catalyst

Synthesis of Light Hydrocarbons via Oxidative Coupling of Methane over Silica-supported Na2WO4-TiO2 Catalyst

Enhanced Catalytic Performance of CuO–ZnO–Al2O3/SAPO-5 Bifunctional Catalysts for Direct Conversion of Syngas to Light Hydrocarbons and Insights into the Role of Zeolite Acidity

Synthesis of light hydrocarbons from synthesis gas using bifunctional catalysts consisting of CuO–ZnO–Al2O3 methanol synthesis catalysts and SAPO-5 were investigated in a fixed bed reactor. The operating results showed that both the temperature and the ratio of CZA/SAPO-5 influenced the CO conversion and the selectivity of the catalysts. The effects of different dehydration component such as HZSM-5, HMOR and SAPO-5 and subsequently the impact of the zeolite acidity on the catalytic performance were also investigated. Experimental results indicated that zeolites in bifunctional catalysts played the crucial role for the distribution of hydrocarbons, and SAPO-5 was superior to the other zeolites in terms of better conversion and C3–C5 selectivity due to its suitable topology and proper acidic property. The efficiency of the CZA/SAPO-5 catalysts was found to be directly proportional to the Bronsted acid sites density of the zeolite and Bronsted acid sites are the likely zeolite active sites for DME dehydration. High time–space yield (461.6 mg mL−1 h−1) and high selectivity (88.1%) of light hydrocarbons (C3–C5) could be achieved on the CZA/SAPO-5-0.4 catalyst at 290 °C.

Promotion effect of Co on Cu–Zn–Al/Hβ catalyst for light hydrocarbons (C3–C5) synthesis from syngas

The synthesis of light hydrocarbons from syngas has received great attention due to the environmentally benign characteristics and uses as clean fuels and raw chemical feedstock of C3–C5 hydrocarbons. In this work, the synthesis of C3–C5 hydrocarbons was carried out over hybrid catalysts of Cu–Zn–Al/Co–Hβ at low reaction temperature (290°C). Introduction of minor amount of Co significantly promoted the yield of C3–C5 hydrocarbons. When the weight percentage of Co in Co–Hβ was 0.113wt.%, Cu–Zn–Al/Co–Hβ showed the best performance. This study will contribute to the development of efficient catalysts for production of hydrocarbons from syngas.

Synthesis of light hydrocarbons over Fe/AC catalysts

A series of Fe/AC catalysts for catalytic hydrogenation of CO to light hydrocarbons (LHCs) were prepared by decomposing Fe(CO)5 in an autoclave. The catalysts activities were tested in a high-pressure micro reactor. The results show that both CO conversion and LHCs selectivity were significantly affected by the amount of Fe loaded onto the catalysts. The optimum Fe content was determined to be 10% by weight of the catalyst. Over the corresponding catalyst (i.e., 10% Fe/C catalyst), the conversion of CO and the selectivity of LHCs were 94.8% and 59.2%, respectively, at 360°C. Based on various catalyst characterization techniques, such as XRD, BET and SEM, the catalysts surface areas and pore volume decreased and the smaller particles agglomerated at the edges and corners in the outer region of the support with the increasing Fe content. The agglomerated particles increased greatly when the iron content of the catalyst was higher than 10%. The decrease of catalyst activity can be due to the agglomerated particles.

The Effect of Co Loading on the Performance of CoxMn0.06/SiO2 Catalysts for the Synthesis of Light Hydrocarbons from CO Hydrogenation

A series of CoxMn0.06/SiO2 catalysts, which were used for the synthesis of light hydrocarbons from CO hydrogenation, were prepared. The effects of reaction temperature, the morphological and structural properties of the catalysts on the CO conversion and product selectivity were examined. The results show that both CO conversion and C2 to C4 hydrocarbon selectivity are significantly affected by the amount of Co loaded onto the catalysts. The optimum Co content was determined to be 10 wt% (i.e., for Co0.10Mn0.06/SiO2) catalyst, and corresponding CO conversion and the selectivity to C2 to C4 hydrocarbons are 95.3 and 80.6%, respectively, at 400°C.

RETRACTED: Synthesis of light hydrocarbons from CO hydrogenation over CoxMn0.06/SiO2

RETRACTED: Synthesis of light hydrocarbons from CO hydrogenation over CoxMn0.06/SiO2

7-6.活性炭担持触媒による合成ガスからの低級炭化水素製造(Session(7)21世紀の燃料製造技術を目指して)

7-6.活性炭担持触媒による合成ガスからの低級炭化水素製造(Session(7)21世紀の燃料製造技術を目指して)