Effective additives of Ni/α-Al2O3 catalyst at low methane conversion of oxidative reforming for syngas formation

Oxidative reforming of methane was conducted at 650 °°C, 1 MPa, and GHSV= 2,000,000 N ml/(g h) using Ni/α-Al2O3 catalyst. Dilution of catalyst bed with α-Al2O3 prevented the formation of hot-spots in the catalyst bed. Element X (X=BX=B, P, Ca, Mn, Fe, Cd, Ce, Gd and Re) was added to Ni/α-Al2O3, and the catalyst activities were experimentally observed to obtain training data of an artificial neural network (ANN). Then the physicochemical properties of element X and the observed values (CH4 conversion, H2 selectivity, or CO selectivity) of Ni–X/α-Al2O3 catalyst were used for ANN training. After the training, the ANN was able to predict the catalytic performance of Ni–Z/α-Al2O3 based on the physicochemical properties of element Z where Z is a possible additive other than X. In addition to La and Ce, Sc and Nd were predicted to promote the activity of Ni/α-Al2O3. The experimentally observed activity of Ni–Sc/α-Al2O3 was five times higher than that of unpromoted Ni/α-Al2O3 catalyst.

Oxidative reforming of methane was conducted at 650 °°C, 1 MPa, and GHSV=2,000,000GHSV=2,000,000 N ml/(g h). Screening for effective additives was conducted by means of a new methodology consisting of an artificial neural network and physicochemical properties of elements to find new additives such as Sc and Nd. The initial reaction rate with Ni–Sc/α-Al2O3was five times higher than that with Ni/α-Al2O3 catalyst.Figure optionsDownload as PowerPoint slide