Abstract
A novel dual Ni-based catalytic process (DCP) to control the H2/CO ratio of 2 in the syngas product within one step at temperature <700 °C was created and constructed. With the sequence of the catalysts located in the single reactor, the endothermic combined steam and CO2 reforming of methane (CSCRM) reaction and the exothermic ultra-high-temperature water–gas shift (UHT-WGS) reaction work continuously. During the process, the H2/CO ratio is raised suddenly at UHT-WGS after the syngas is produced from CSCRM, and CSCRM utilizes the heat released from UHT-WGS. Due to these features, DCP is more compact, enhances energy efficiency, and thus decreases the capital cost compared to reformers connecting with shift reactors. To prove this propose, the DCP tests were done in a fixed-bed reactor under various conditions (temperature = 500, 550, and 600 °C; the feed mixture (CH4, CO2, H2O, and N2) with H2O/(CH4 + CO2) ratio = 0.33, 0.53, and 0.67). According to the highest CH4 conversion (around 65%) with carbon tolerance, the recommended conditions for producing syngas with the H2/CO ratio of 2 as a feedstock of Fischer–Tropsch synthesis include the temperature of 600 °C and the H2O/(CH4 + CO2) ratio of 0.53.
Highlights
The ongoing contamination of air by greenhouse gases has been a critical issue as it causes adverse environmental impacts around the world
CO2 reforming of methane (CSCRM) has received considerable attention for syngas production in order to control the H2 /CO ratio of syngas by adjusting the feed composition of H2 O and CO2 without the additional units of the oxygen supply [13,14]
combined steam and CO2 reforming of methane (CSCRM) and the ultra-high-temperature water–gas shift (UHT-WGS) reactions as a dual catalytic process, the operating temperature should equilibrium conversions (23% at 500 ◦ C, 39% at 550 ◦ C, and 59% at 600 ◦ C) calculated using the be limited at 600 °C to maintain the activity of the UHT-WGS due to its nature of exothermic reaction reactivity test conditions
Summary
The ongoing contamination of air by greenhouse gases has been a critical issue as it causes adverse environmental impacts around the world. Jabbour et al [23] developed “one-pot” mesoporous nickel alumina-based catalysts using the EISA method for the CSCRM reaction operating at 800 ◦ C These high Ni dispersion catalysts enhanced activity and stability (CH4 conversion of around 80%) with a sustainable H2 /CO molar ratio close to 2 in gas production. Ni-based catalytic process (DCP) that converts CH4 and CO2 , the main greenhouse gases, into syngas with the H2 /CO ratio of about 2 at relatively low temperatures (
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
