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Tetralin Hydrogenation over Supported Nickel Catalysts
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2021-10-20 , DOI: 10.1021/acs.iecr.1c03138 Ahmed K. AlAsseel 1 , S. David Jackson 1
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2021-10-20 , DOI: 10.1021/acs.iecr.1c03138 Ahmed K. AlAsseel 1 , S. David Jackson 1
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An investigation was carried out to study the feasibility of using 5% nickel/alumina catalysts synthesized with different methods and metal precursors for the hydrogenation of tetralin. The catalysts were characterized using atomic absorption spectroscopy, thermogravimetric analysis, X-ray powder diffraction, X-ray photoelectron spectroscopy (XPS), hydrogen chemisorption, and surface area and pore volume analyses. The catalysts were tested in a continuous-flow, fixed-bed, reactor using solvent-free tetralin feed under the conditions of 5 barg hydrogen, 210 °C, a weight hourly space velocity of 5 h–1, and a H2/HC ratio of 7.5 (gas hourly space velocity, 4220 h–1). These reaction conditions were much milder than the ones reported in literature but showed considerably higher catalytic activity even with low metal loadings. The study indicated that the product’s isomer ratio was governed by kinetics. Indeed, a remarkable difference was observed in the selectivity for the catalysts synthesized with different metal precursors in relation to cis/trans decalin ratios, where catalysts derived from nickel carbonate showed higher selectivity to cis-decalin compared to catalysts prepared from nickel nitrate. It was speculated that the dispersion and particle size played an important role in this variance, as suggested by XPS and hydrogen chemisorption. It was also found that this change in selectivity was not related to conversion. Similarly, different deactivation patterns were observed over these catalysts.
中文翻译：
负载型镍催化剂上的四氢萘加氢
进行了一项调查，以研究使用不同方法合成的 5% 镍/氧化铝催化剂和金属前体用于四氢化萘加氢的可行性。使用原子吸收光谱、热重分析、X 射线粉末衍射、X 射线光电子能谱 (XPS)、氢化学吸附以及表面积和孔体积分析对催化剂进行表征。在 5 barg 氢气、210 °C、5 h –1重时空速和 H 2 /HC条件下，使用无溶剂四氢化萘进料在连续流动、固定床反应器中测试催化剂比值 7.5（气时空速，4220 h –1）。这些反应条件比文献中报道的条件温和得多，但即使在金属负载量较低的情况下也表现出相当高的催化活性。研究表明产物的异构体比例受动力学控制。事实上，观察到用不同金属前体合成的催化剂在顺式/反式十氢化萘比例方面的选择性存在显着差异，其中源自碳酸镍的催化剂对顺式的选择性更高-十氢化萘与由硝酸镍制备的催化剂相比。据推测，正如 XPS 和氢化学吸附所表明的那样，分散度和粒度在这种变化中起重要作用。还发现选择性的这种变化与转化率无关。类似地，在这些催化剂上观察到不同的失活模式。
更新日期：2021-11-03
中文翻译：
负载型镍催化剂上的四氢萘加氢
进行了一项调查，以研究使用不同方法合成的 5% 镍/氧化铝催化剂和金属前体用于四氢化萘加氢的可行性。使用原子吸收光谱、热重分析、X 射线粉末衍射、X 射线光电子能谱 (XPS)、氢化学吸附以及表面积和孔体积分析对催化剂进行表征。在 5 barg 氢气、210 °C、5 h –1重时空速和 H 2 /HC条件下，使用无溶剂四氢化萘进料在连续流动、固定床反应器中测试催化剂比值 7.5（气时空速，4220 h –1）。这些反应条件比文献中报道的条件温和得多，但即使在金属负载量较低的情况下也表现出相当高的催化活性。研究表明产物的异构体比例受动力学控制。事实上，观察到用不同金属前体合成的催化剂在顺式/反式十氢化萘比例方面的选择性存在显着差异，其中源自碳酸镍的催化剂对顺式的选择性更高-十氢化萘与由硝酸镍制备的催化剂相比。据推测，正如 XPS 和氢化学吸附所表明的那样，分散度和粒度在这种变化中起重要作用。还发现选择性的这种变化与转化率无关。类似地，在这些催化剂上观察到不同的失活模式。
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