HY分子筛对萘和α-十四碳烯烷基化的催化性能及工业试验,New Journal of Chemistry

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HY分子筛对萘和α-十四碳烯烷基化的催化性能及工业试验
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2021-12-21 , DOI: 10.1039/d1nj04876g
Mengke Wang ₁ , Leiting Kuai ₁ , Li Shi ₁ , Xuan Meng ₁ , Naiwang Liu ₁

Affiliation

烷基萘作为一种性能优良的合成润滑剂，广泛应用于石油化工和制造业。烷基萘是由萘和α-十四碳烯在烷基化催化剂的作用下生成的。测试了几种固体酸催化剂（粘土、硫酸化氧化锆和 HFAU 沸石）对这种烷基化的活性。试验结果表明，烷基化催化剂的活性与酸度、比表面积和孔结构密切相关。适当的酸度和酸量是必要的。此外，沸石的选择性催化有利于烷基化。HFAU沸石的使用寿命是在工业条件下测量的。采用XRD、SEM、TG/DTG、BET和Py-IR等手段研究了HFAU沸石的失活和再生行为。结果表明，新鲜HFAU沸石使用寿命达到480小时，萘转化率可达95%。后原位再生，使用寿命达到240小时，单烷基萘选择性接近100%。因此，主要问题是活动的迅速丧失。根据失活催化剂的表征，无定形焦对孔隙的堵塞和活性位点的覆盖是HFAU沸石失活的主要原因。此外，强布朗斯台德酸位点首先被焦炭覆盖。失活催化剂的活性可以通过在实验室中进行煅烧来很大程度上恢复。

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Catalytic performance and industrial test of HY zeolite for alkylation of naphthalene and α-tetradecene

As a synthetic lubricant with excellent properties, alkyl naphthalene is widely used in petrochemical and manufacturing industries. Alkyl naphthalene is formed by naphthalene and α-tetradecene under the action of an alkylation catalyst. The activities of several solid acid catalysts (clay, sulfated zirconia and HFAU zeolite) for such alkylation were tested. Results of the test showed that the activity of the alkylation catalyst was closely related to acidity, specific surface area and pore structure. Appropriate acidity and acid amount are necessary. In addition, the selective catalysis of zeolite was favorable for alkylation. The service life of HFAU zeolite was measured under industrial conditions. The deactivation and regeneration behaviors of HFAU zeolite were studied by XRD, SEM, TG/DTG, BET and Py-IR. The results showed that the service life of fresh HFAU zeolite reached 480 hours and the conversion of naphthalene can reach 95%. After in situ regeneration, the service life reached 240 hours and the selectivity of monoalkyl naphthalene reached nearly 100%. Thus the main problem was the rapid loss of activity. According to the characterization of deactivated catalyst, the blockage of pores by amorphous coke and the covering of active sites were the main reasons for HFAU zeolite deactivation. Moreover, the strong Brønsted acid sites were first covered by coke. The activity of the deactivated catalyst can be largely restored by calcinations in the laboratory.

更新日期：2022-01-13

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