Kaewmeesri Rungnapa, Nonkumwong Jeeranan, Witoon Thongthai, Laosiripojana Navadol, Faungnawakij Kajornsak
The Joint Graduate School of Energy and Environment (JGSEE), King Mongkut's University of Technology Thonburi, Bangkok 10140, Thailand.
National Nanotechnology Center (NANOTEC), National Science and Technology Development Agency (NSTDA), Pathum Thani 12120, Thailand.
Nanomaterials (Basel). 2020 Dec 18;10(12):2548. doi: 10.3390/nano10122548.
The catalytic deoxygenation of coconut oil was performed in a continuous-flow reactor over bimetallic NiCo/silicoaluminophosphate-11 (SAPO-11) nanocatalysts for hydrocarbon fuel production. The conversion and product distribution were investigated over NiCo/SAPO-11 with different applied co-reactants, i.e., water (HO) or glycerol solution, performed under nitrogen (N) atmosphere. The hydrogen-containing co-reactants were proposed here as in-situ hydrogen sources for the deoxygenation, while the reaction tests under hydrogen (H) atmosphere were also applied as a reference set of experiments. The results showed that applying co-reactants to the reaction enhanced the oil conversion as the following order: N (no co-reactant) < N (HO) < N (aqueous glycerol) < H (reference). The main products formed under the existence of HO or glycerol solution were free fatty acids (FFAs) and their corresponding C alkanes. The addition of HO aids the triglyceride breakdown into FFAs, whereas the glycerol acts as hydrogen donor which is favourable to initiate hydrogenolysis of triglycerides, causing higher amount of FFAs than the former case. Consequently, those FFAs can be deoxygenated via decarbonylation/decarboxylation to their corresponding C alkanes, showing the promising capability of the NiCo/SAPO-11 to produce hydrocarbon fuels even in the absence of external H source.
在连续流动反应器中，以双金属NiCo/硅铝磷酸盐-11（SAPO-11）纳米催化剂对椰子油进行催化脱氧以生产烃类燃料。在氮气（N）气氛下，研究了不同共反应物（即水（HO）或甘油溶液）存在时NiCo/SAPO-11上的转化率和产物分布。这里提出含氢共反应物作为脱氧的原位氢源，同时也进行了氢气（H）气氛下的反应测试作为参考实验集。结果表明，向反应中加入共反应物可提高油的转化率，顺序如下：N（无共反应物）<N（HO）<N（甘油水溶液）<H（参考）。在HO或甘油溶液存在下形成的主要产物是游离脂肪酸（FFA）及其相应的C烷烃。HO的加入有助于甘油三酯分解为FFA，而甘油作为氢供体有利于引发甘油三酯的氢解，导致FFA的量比前一种情况更高。因此，这些FFA可通过脱羰/脱羧作用脱氧生成相应的C烷烃，这表明即使在没有外部氢源的情况下，NiCo/SAPO-11也具有生产烃类燃料的潜力。
