Microwave-Assisted Synthesis of Ethylene Glycol-Intercalated NiAl LDHs and Their Application for Intracrystalline Catalytic Esterification with Naphthenic Acids in Crude Oil
Microwave-Assisted Synthesis of Ethylene Glycol-Intercalated NiAl LDHs and Their Application for Intracrystalline Catalytic Esterification with Naphthenic Acids in Crude Oil
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微波辅助合成乙二醇插层NiAl LDHs及其在原油中环烷酸晶内催化酯化反应中的应用
DOI：
10.1021/acs.energyfuels.7b01424
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发表时间：
2017-08
期刊：
影响因子：
5.3
通讯作者：
Guo Ke
中科院分区：
文献类型：
--
作者：
Wang Hao;Liu Xinyue;Wu Yan;Hou Chunyan;Qiu Yue;Guo Ke
采用微波辅助离子交换法制备了不同Ni/Al摩尔比的乙二醇层状双氢氧化物。与传统的离子交换方法相比，这种方法可以获得更有序的层状结构，并将离子交换时间从12h缩短到30min。将所制备的EG插层水滑石作为酯化催化剂，用于脱除原油中的环烷酸。结果表明，EG插层LDHs可以作为纳米晶内催化微反应器，这归因于预插层EG减小了扩散阻力，增大了层间空间，有利于环烷酸的进入，以及层中金属催化中心的作用。受限的层间空间加强了反应物之间的碰撞，加速了反应。因此，EG插层LDHs的脱酸率和EG转化率是硝酸型LDHs的数倍。随着Ni/Al比的增加，催化剂S的用量增加。
Ethylene glycol (EG)-intercalated layered double hydroxides (LDHs) with various Ni/Al molar ratios were prepared by a microwave-assisted ion exchange method. In comparison with the conventional ion exchange method, this method can achieve a more ordered layered structure and reduce the ion exchange time from 12 h to 30 min. The as-prepared EG-intercalated LDHs were used as esterification catalysts to remove naphthenic acids in crude oil. It is found that EG-intercalated LDHs may act as nanosized intracrystalline catalytic microreactors, attributed to the preintercalated EG which reduces the diffusion resistance, the enlarged interlayer space which facilitates the access of naphthenic acids, and metal catalytic sites in the layer. The confined interlayer space enhances the collision between reactants and accelerates the reaction. Therefore, EG-intercalated LDHs exhibit several times higher acid removal ratio and EG conversion than nitrate LDHs. The increasing Ni/Al ratio increases the amount of catalytic s...
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