Synthesis of gasoline-range hydrocarbons from nitrogen-rich syngas over a Mo/HZSM-5 bi-functional catalyst

Abstract

Keywords:Hydrocarbons Syngas Mo/HZSM-5 Bi-functional catalyst Coke deposition a b s t r a c tThe production of gasoline-range hydrocarbons from nitrogen-rich syngas was studied over a Mo/HZSM-5 bi-functional catalyst in a bench-scale continuous stainless steel fixed-bed reactor with different reaction conditions. The reaction conditions, i.e., temperature, pressure, and gas hourly space velocity (GHSV), significantly affected the hydrocarbon selectivity. Mo/HZSM-5 was more active in a temperature zone between 350 and 380 C, a reaction pressure of 1000 psig, and a GHSV of 600 h À1 within the test operation condition ranges that were used. More than 20 hydrocarbons were mainly identified from the oil phase sample and can be classified as iso-paraffin, aromatic and naphthene hydrocarbons. The carbon number of the oil sample from the nitrogen-rich syngas mainly contained C 8 eC 10 hydrocarbons. A high content of nitrogen in syngas was found to have an effect on the liquid hydrocarbon distribution over the Mo/HZSM-5 catalyst.

Effect of Co-Feeding Inorganic and Organic Molecules in the Fe and Co Catalyzed Fischer–Tropsch Synthesis: A Review

“…These results are different from the findings of Jess et al [75] and Xu et al [78]. Lu et al [42] findings are partially in agreement with conclusions from Muleja et al [41] studies. Muleja et al [41] investigated the effect of nitrogen co-feeding to an FT reactor while maintaining the partial pressures of reactants and concluded that the selectivity to all light hydrocarbons decreased while the selectivity to C 5+ in mainly C 5 -C 19 fraction is enhanced.…”

“…The presence of nitrogen in the reactor has little influence on the kinetics if the reactants (carbon monoxide and hydrogen) partial pressures are kept constant. However, Lu et al [42] used feed composed of nitrogen-rich syngas in FTS and obtained more C 10 hydrocarbons and smaller amounts of C 8 hydrocarbons which were more when compared to FTS carried out with pure syngas. These results are different from the findings of Jess et al [75] and Xu et al [78].…”

“…The effects of co-feeding nitrogen (N 2 ) in the FTS in a fixed bed reactor over a Co/TiO 2 catalyst was investigated by to elucidate the effect on the catalytic activity, selectivity, and the implication on the FTS kinetics [41]. Nitrogen-rich syngas was used to gain an understanding of its behavior in thermochemical catalytic conversion to gasoline range hydrocarbon [42]. As such, researchers [43] have recently proposed that when operating a cobalt-based FTS process, the olefin and paraffin formation rates should be considered separately.…”

One-Step Synthesis of Aromatics from Syngas over K-Modified FeMnO/MoNi-ZSM-5

“…It has been commonly reported that the thermogravimetric curve of the catalyst with large amounts of carbon deposit drops obviously during the high temperature stage. 1,5,30 In contrast, the weight curve of the K-modified FeMnO/MoNi-ZSM-5 catalyst increased instead. It can be inferred that the content of carbon deposited on the catalyst after the reaction was quite lower.…”

The Effects of the Crystalline Phase of Zirconia on C–O Activation and C–C Coupling in Converting Syngas into Aromatics

“…The conversion of syngas is a promising route to obtain high value chemicals from non-petroleum resources due to the wide variety of sources of syngas [2]. Considerable efforts have been made in the conversion of syngas to a range of hydrocarbons such as lower olefins, gasoline, diesel, and aromatics [3][4][5][6]. Syngas to hydrocarbons reaction was firstly achieved in 1923, known as the Fischer-Tropsch synthesis (FTS).…”