The effects of dealumination of BEA zeolite on the formation of nickel active sites and the performance of Ni-containing BEA zeolite catalysts in the steam reforming of ethanol have been studied. Ni-containing BEA zeolite catalysts were prepared by the impregnation of unmodified and dealuminated BEA zeolites with Ni(NO₃)₂ precursor. The properties of Ni₁₀HAlBEA and Ni₁₀SiBEA zeolite catalysts were studied by means of X-ray diffraction, ¹H, ²⁷Al and ²⁹Si magic-angle spinning nuclear magnetic resonance, Fourier-transform infrared and Raman spectroscopy, transmission electron microscopy, temperature-programmed reduction, temperature-programmed ammonia and hydrogen desorption methods. High initial activity and selectivity of Ni₁₀HAlBEA to hydrogen and carbon dioxide with unmodified BEA zeolite support in the steam reforming of ethanol reaction performed at 500 °C was observed. However, fast deactivation of Ni₁₀HAlBEA catalyst, manifested in the decrease of water conversion, drop of selectivity to H₂ and CO₂, and increase in the selectivity to ethylene with the time-on-stream, was observed. In contrast, Ni₁₀SiBEA zeolite catalyst showed lower initial activity but higher durability and resistance for carbon deposition. It was stated that dealumination of BEA zeolite led to the slight structural changes and simultaneously pronounced decrease of acidity. Formation of the large nickel crystallites was hindered on Ni₁₀SiBEA zeolite catalyst. TEM and Raman spectroscopy studies indicated that deactivation of Ni₁₀HAlBEA was related to formation of nickel mediated filamentous, graphitic and amorphous carbon deposits. Much smaller amounts of filamentous carbons were observed on the Ni₁₀SiBEA zeolite catalyst prepared by the use of dealuminated zeolite support.

研究了BEA沸石的脱铝对镍活性位的形成的影响以及乙醇蒸汽重整中含Ni的BEA沸石催化剂的性能。通过用Ni（NO ₃）₂前体浸渍未改性和脱铝的BEA沸石来制备含Ni的BEA沸石催化剂。通过X射线衍射，¹ H，²⁷ Al和²⁹的X射线衍射研究了Ni ₁₀ HAlBEA和Ni ₁₀ SiBEA沸石催化剂的性能。硅魔角旋转核磁共振，傅立叶变换红外和拉曼光谱，透射电子显微镜，程序升温还原，程序升温氨和氢解吸方法。在500°C下进行的乙醇反应水蒸气重整中，观察到Ni ₁₀ HAlBEA在未改性的BEA沸石载体上对氢和二氧化碳具有很高的初始活性和选择性。然而，观察到Ni ₁₀ HAlBEA催化剂的快速失活，表现为水转化率的降低，对H ₂和CO ₂的选择性的降低以及对乙烯的选择性随运行时间的增加而增加。相比之下，Ni ₁₀SiBEA沸石催化剂显示出较低的初始活性，但具有较高的耐久性和抗碳沉积性。据指出，BEA沸石的脱铝导致轻微的结构变化并同时显着降低了酸度。在Ni ₁₀ SiBEA沸石催化剂上阻碍了大镍微晶的形成。TEM和拉曼光谱研究表明，Ni ₁₀ HAlBEA的失活与镍介导的丝状，石墨和无定形碳沉积物的形成有关。在通过使用脱铝的沸石载体制备的Ni ₁₀ SiBEA沸石催化剂上观察到的丝状碳的量要少得多。