在改性的V/SiO_2催化剂上甲烷部分氧化合成甲醇

Partial oxidation of methane to methanol over an improved V/SiO 2 catalyst

用Ｌ９（３４）正交配置实验对２％Ｖ／ＳｉＯ２催化剂进行改性研究，常压下用Ｏ２作氧化剂，４５０～５００℃得到较高的甲醇选择性（５０％以上）和较高的甲烷转化率（４％以上），在４８０℃，Ｖ（ＣＨ４）／Ｖ（Ｏ２）＝３时甲醇收率最高。经ＮＨ３－ＴＰＤ、ＴＰＲ和ＦＴ－ＩＲ分析表明，催化剂具有较多的弱酸性中心和表面羟基，Ｖ２Ｏ５及助剂与载体可形成多种相互作用相。

A study on the modification of a 2% V/SiO 2 catalyst is carried out by L 9(3 4)orthogonal experiment. Both the selectivity to methanol and conversion of methane are higher (>50% and > 4%, respectively) in partial oxidation of methane to methanol over the modified catalyst at atmospheric pressure and 450～500℃ with O 2 as an oxidant. The yield of methanol is highest at 480℃ and V (CH 4)/ V (O 2)=3. It is proved by NH 3-TPD, TPR and FT IR studies that the catalyst possesses more weak acid sites and HO on the surface, and a few kinds of interaction may occur between V 2O 5 and promoters with the supporter.