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Mechanism of byproducts formation in the isobutane/butene alkylation on HY zeolites
RSC Advances ( IF 3.9 ) Pub Date : 2018-01-17 00:00:00 , DOI: 10.1039/c7ra12629h Zhiwei Chen 1 , Feng Gao 1 , Kun Ren 1 , Quangui Wu 2 , Yan Luo 3 , Hongjun Zhou 1 , Meng Zhang 4 , Quan Xu 1
RSC Advances ( IF 3.9 ) Pub Date : 2018-01-17 00:00:00 , DOI: 10.1039/c7ra12629h Zhiwei Chen 1 , Feng Gao 1 , Kun Ren 1 , Quangui Wu 2 , Yan Luo 3 , Hongjun Zhou 1 , Meng Zhang 4 , Quan Xu 1
Affiliation
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Submicron-size HY zeolites with a particles size of 200–700 nm were synthesized employing a crystal precipitation method in this study. The catalytic activity for the isobutane/butene alkylation was evaluated. The results indicated that butene conversion was above 90% and the selectivity of expected products (C8) was nearly at 90% within 72 h. The micropores-blocking and coverage of acid sites resulting from high hydrocarbons increased the difficulty for the diffusion of products to the bulk and inhibited the adsorption of reactant on activity sites, which caused deactivation of catalyst. The ultimate C12 content in alkylate oil, stemmed from trimerization of butene, was reduced via the addition reaction with butene to C16 and the cracking to C5–C7. The formation mechanisms and transformation processes of byproducts in alkylate oil revealed that the source of C9–C11 switched from cracking of C16+ to the addition of C5–C7 carbocations with butene when acid sites concentration was reduced by accumulating oligomers.
中文翻译：
HY沸石异丁烷/丁烯烷基化副产物形成机理
本研究采用晶体沉淀法合成了粒径为 200-700 nm 的亚微米级 HY 沸石。评价了异丁烷/丁烯烷基化的催化活性。结果表明，丁烯的转化率在 90% 以上，72 小时内预期产物（C8）的选择性接近 90%。高烃导致的微孔堵塞和酸性位点的覆盖增加了产物向本体扩散的难度，抑制了反应物在活性位点的吸附，导致催化剂失活。源自丁烯三聚的烷基化油中的最终 C12 含量通过以下方法降低与丁烯的加成反应生成 C16，裂解生成 C5-C7。烷基化油中副产物的形成机制和转化过程表明，当通过积累低聚物降低酸位浓度时，C9-C11 的来源从 C16+ 的裂解转变为 C5-C7 碳正离子与丁烯的添加。
更新日期：2018-01-17
中文翻译：
HY沸石异丁烷/丁烯烷基化副产物形成机理
本研究采用晶体沉淀法合成了粒径为 200-700 nm 的亚微米级 HY 沸石。评价了异丁烷/丁烯烷基化的催化活性。结果表明，丁烯的转化率在 90% 以上，72 小时内预期产物（C8）的选择性接近 90%。高烃导致的微孔堵塞和酸性位点的覆盖增加了产物向本体扩散的难度，抑制了反应物在活性位点的吸附，导致催化剂失活。源自丁烯三聚的烷基化油中的最终 C12 含量通过以下方法降低与丁烯的加成反应生成 C16，裂解生成 C5-C7。烷基化油中副产物的形成机制和转化过程表明，当通过积累低聚物降低酸位浓度时，C9-C11 的来源从 C16+ 的裂解转变为 C5-C7 碳正离子与丁烯的添加。
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