Netskina Olga, Mucha Svetlana, Veselovskaya Janna, Bolotov Vasily, Komova Oxana, Ishchenko Arkady, Bulavchenko Olga, Prosvirin Igor, Pochtar Alena, Rogov Vladimir
Boreskov Institute of Catalysis SB RAS, Pr. Akademika Lavrentieva 5, 630090 Novosibirsk, Russia.
Materials (Basel). 2021 Nov 10;14(22):6789. doi: 10.3390/ma14226789.
The development of solvent-free methods for the synthesis of catalysts is one of the main tasks of green chemistry. A nickel-alumina catalyst for CO methanation was synthesized by solid-state combustion method using hexakis-(imidazole) nickel (II) nitrate complex. Using X-ray Powder Diffraction (XRD), Transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and Hydrogen temperature-programmed reduction (H-TPR), it was shown that the synthesized catalyst is characterized by the localization of easily reduced nickel oxide on alumina surface. This provided low-temperature activation of the catalyst in the reaction mixture containing 4 vol% CO. In addition, the synthesized catalyst had higher activity in low-temperature CO methanation compared to industrial NIAP-07-01 catalyst, which contained almost three times more hard-to-reduce nickel-aluminum spinel. Thus, the proposed approaches to the synthesis and activation of the catalyst make it possible to simplify the catalyst preparation procedure and to abandon the use of solvents, which must be disposed of later on.
开发无溶剂合成催化剂的方法是绿色化学的主要任务之一。采用六（咪唑）硝酸镍（II）配合物通过固态燃烧法合成了用于CO甲烷化的镍-氧化铝催化剂。利用X射线粉末衍射（XRD）、透射电子显微镜（TEM）、X射线光电子能谱（XPS）和氢气程序升温还原（H-TPR）表明，合成的催化剂的特征在于易还原的氧化镍在氧化铝表面的定位。这使得催化剂在含4 vol% CO的反应混合物中能够低温活化。此外，与工业NIAP-07-01催化剂相比，合成的催化剂在低温CO甲烷化中具有更高的活性，工业NIAP-07-01催化剂含有几乎三倍于难以还原的镍铝尖晶石。因此，所提出的催化剂合成和活化方法使得简化催化剂制备程序并摒弃后续必须处理的溶剂的使用成为可能。
