Sun Lanlan, Wang Yu, Gu Xuesong, Zhao Meng, Yuan Lijuan
Department of Application Chemistry, College of Biotechnology and Food Science, Tianjin University of Commerce, Tianjin 300134, China.
School of Materials Science and Engineering and National Institute for Advanced Materials, Nankai University, Tianjin 300350, China.
Molecules. 2024 May 11;29(10):2273. doi: 10.3390/molecules29102273.
Cu/SAPO-34 synthesized via a one-pot method with relatively low silicon content and copper loading at around 2 wt.% facilitated continuous oxidation of methane to methanol with a methanol space time yield of 504 μmol/g/h. Remarkably, the methanol yield exceeded 1800 mmol/mol/h at 623 K. Typically, the presence of trace oxygen in the system was the key to maintaining the high selectivity to methanol. Characterization results from a series of techniques, including XRD, SEM, TEM, H-TPR, NH-TPD, UV-vis, and FTIR, indicated that Cu existed in the position where it moves from hexagonal rings to elliptical cages as the active center.
通过一锅法合成的硅含量相对较低且铜负载量约为2 wt.%的Cu/SAPO-34，促进了甲烷连续氧化为甲醇，甲醇时空产率为504 μmol/g/h。值得注意的是，在623 K时甲醇产率超过1800 mmol/mol/h。通常，体系中痕量氧的存在是保持对甲醇高选择性的关键。包括XRD、SEM、TEM、H-TPR、NH-TPD、UV-vis和FTIR在内的一系列技术的表征结果表明，Cu作为活性中心存在于从六元环向椭圆形笼迁移的位置。
