焙烧温度对非负载二硫化钼催化剂加氢脱硫性能的影响

INFLUENCE OF CALCINATION TEMPERATURE ON PROPERTIES OF UNSUPPORTED MoS_2 CATALYSTS

考察了焙烧温度对以四硫代钼酸铵为前躯体制备二硫化钼催化剂加氢脱硫活性的影响。采用BET,XRD,SEM,HRTEM,XPS等手段对催化剂进行表征,并以二苯并噻吩为原料,在高压釜反应器中评价催化剂活性。结果表明:随着焙烧温度的升高,MoS2的比表面积、结晶度逐渐升高,惰性气氛中焙烧时,主要通过改变催化剂中S元素的含量和价态来影响催化剂的物化性质;焙烧温度为400℃时,所得催化剂的活性最高。

Unsupported MoS2 were obtained from the decomposition of ammonium tetrathiomolybdate（ATM）at variable temperatures（200—600℃）under N2.The effect of calcination temperature on the HDS activity of MoS2 using ATM as precursor was tested.The structures and properties of the catalysts were investigated by means of BET,XRD,SEM,TEM and XPS.The dibenzothiophene HDS activity was studied in an autoclave reactor.The results indicate that as the calcination temperature rises,the surface area and crysatllinity gradually increase.The characterizations show that the properties of the catalysts are affected by the amount and valence state of S.The optimal calcination temperature for the ATM was 400 ℃,resulting in the highest catalytic activity.