كوثر خسروي

Reduction of energy resources and global warming are the vital phenomena that impress human’s life. Dry reforming of methane reaction is compatible with environment that uses methane and carbon dioxide to produce synthesis gas. Nickel-based catalysts are the common one that employs in this reaction due to its high performance, good selectivity, accessibility and cheapness. In this study, activated carbon, which possessed mesoporous structure and high specific area, was used as support. Also, in order to modify the structural properties of activated carbon, the HNO3 was employed. Nickel-based catalysts with various loadings supported on modified activated carbon fabricated via wet impregnation method. The impact of nickel loading and calcination temperature on textural features and catalytic performance was investigated. Besides, in order to eva‎luate characteristic properties of catalysts, the XRD, BET, H2-TPR, TPO and FESEM analyses was used. Outcomes revealed that all catalysts possessed high BET area (1218- 1483 m2/g), mesoporous structure and pore size distributions in the range of 2/18-2/26 nm. According to activity tests, catalytic performance was increased with enhancement of nickel percentage from 2/5 to 15 wt.%. However, much carbon was formed over catalysts. The 12/5 wt.%. NiO/AC catalyst possessed the superior catalytic performance with methane conversion of 64/58 and CO2 conversion of 63/5 at 700C, total flow rate of and feed composition of CH4: CO2 =1. Also, this catalyst showed the best stability at 700 C during 5 h compared to other catalysts. Besides, catalytic performance decreased with increase of calcination temperature from 400 to 600C because of agglomeration of particles and formation of large crystals at higher temperatures. In the second phase of study, some promoters such as barium, strontium, calcium and magnesium oxides doped with activated carbon to eva‎luate textural features and catalytic performance of catalysts. Among the promoters, the Sr-promoted catalyst possessed high methane conversion and high stability at 700C compared to other promoters. Results exhibited that increase of SrO loading up to 7 wt.%. improved methane conversion about 7% than other catalysts. Furthermore, the influence of feed composition, reduction temperature, calcination temperature and GHSV was assessed on catalytic performance and textural features of catalysts in all the two phases of project.

گاز سنتز , كربن فعال , ريفرمينگ خشك

Synthesisgas , Activatedcarbon , Dryreforming

Kosar Khosravi

Dr. Mehdi Alavi Amlashi