Na-Mn-Zr-W-S-P/SiO2六组分甲烷氧化偶联催化剂制备表征及机理探索

six component catalyst Na-Mn-Zr-W-S-P/SiO2 were prepared and tested on a fixed-bed micro-reactor without inert gases as thinner. Experimental results indicate that the average methane conversion and C2 hydrocarbon selectivity in OCM are about 35%,70%,respectively,the yield is more than 25%, In order to study the catalytic mechanism of multi-component OCM catalysts and farther improve catalytic performance, FT – IR，XRD，XPS and SEM were used to characterize the multi-component OCM catalysts. The experimental results show that Mn2O3 was main active species and addition of Zr further activated methane molecules to improve methane conversion; C2 selectivity was improved by adding W and P, and suppressed deep oxidation property of SiO2; W–O in catalyst surface was not active species.