Methane, the main component of natural gas and considered a greenhouse gas, was converted to value-added hydrocarbons (C₂₊) using synthesized Na₂WO₄ and MnTiO₃ supported on SBA-15 through the oxidative coupling of methane. The MnTiO₃ co-impregnated with Na₂WO₄ on SBA-15 (MnTiO₃-NW/SBA-15) was more active than catalysts that were prepared using a simple one-pot impregnation of Mn²⁺, Ti⁴⁺, and Na₂WO₄ over fumed-SiO₂, MCM-41, or SBA-15. Characterizations of the catalysts suggested that the presence of MnTiO₃ was more important in the activation of methane relative to Mn₂O₃. The highest C₂₊ yield obtained from MnTiO₃-NW/SBA-15 was 24.9% with 63.0% C₂₊ selectivity and 39.4% CH₄ conversion at a reaction temperature of 700 °C, a feed ratio of CH₄:O₂:N₂ = 3:1:4, and a space velocity of 18,500 h^-1. A time-on-stream test of MnTiO₃-NW/SBA-15 over 25 h revealed that the C₂₊ yield slowly decreased from 24.9% to 20.2% at the end of the 25 h run, because of a decrease in the catalyst’s surface area, a loss of active Na₂WO₄ from the catalyst, and the destruction of α-cristobalite. Experiments using in-situ diffuse reflectance infrared Fourier transform spectroscopy with mass spectrometry, operated at 475 °C, revealed that the MnTiO₃-NW/SBA-15 catalyst enhanced the formation of CH₃ and H radicals, while no products or intermediates were found when only SBA-15 was tested.

甲烷是天然气的主要成分，被认为是一种温室气体，利用甲烷的氧化偶联作用，将合成的Na ₂ WO ₄和MnTiO ₃负载在SBA-15上，将其转化为高附加值的碳氢化合物（C ₂₊）。所述MnTiO ₃共浸渍用Na ₂ WO ₄上SBA-15（MnTiO ₃ -NW / SBA-15）比使用锰的简单一锅浸渍制备的催化剂更具活性²⁺，钛⁴⁺，和Na ₂ WO ₄在热解法SiO ₂，MCM-41或SBA-15上。催化剂的表征表明MnTiO的存在₃是相对于甲烷的活化与Mn更重要₂ ö ₃。从MnTiO ₃ -NW / SBA-15获得的最高C ₂₊产率为24.9％，在700°C的反应温度下，CH ₄：O ₂的进料比具有63.0％的C ₂₊选择性和39.4％的CH ₄转化率。：N ₂  = 3：1：4，并且空速为18,500 h ^-1。MnTiO ₃ -NW / SBA-15经过25小时的运行时间测试显示，在25小时运行结束时，C _2+的收率从24.9％缓慢降低至20.2％，这是由于催化剂的降低所致。表面积，活性钠的损失₂ WO ₄由催化剂中和，破坏α-方英石。在475°C下使用原位漫反射红外傅里叶变换质谱联用质谱进行的实验表明，MnTiO ₃ -NW / SBA-15催化剂可增强CH ₃和H自由基的形成，而未发现任何产物或中间体仅测试了SBA-15。