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Catalytic upgrading of pyrolysis vapors from lignite over mono/bimetal-loaded mesoporous HZSM-5
Fuel ( IF 7.4 ) Pub Date : 2018-04-01 , DOI: 10.1016/j.fuel.2018.01.017
Xue-Yu Ren , Jing-Pei Cao , Xiao-Yan Zhao , Zhen Yang , Tian-Long Liu , Xing Fan , Yun-Peng Zhao , Xian-Yong Wei

Abstract HZSM-5 was modified via alkaline treatment and wet impregnation method which loading transition metals (Co, Mo–Co and Ni–Co). The performance of catalysts for the catalytic fast pyrolysis of lignite was tested in a drop tube reactor at 600 °C. In comparison to non-catalytic experiment, the chemical composition of upgrading tar was obviously simplified, which mainly contains light aromatics such as benzene, toluene, ethylbenzene, xylene and naphthalene (BTEXN). The yield of BTEXN was significantly increased from 12.9 to 26.4 mg/g when Ni/Co-H-5 was used. Meanwhile, the Ni/Co-H-5 treated by NaOH solution achieved considerable deoxygenation performance (86.6%) than other ones. The addition of bimetallic Mo–Co or Ni–Co significantly enhanced the BTEXN selectivity of HZSM-5. Ni promoted H 2 formation in gaseous product and caused the decrease of naphthalenes yield. Whereas the yields of toluene and o -xylene increased after the pyrolysis vapors pass through Mo/Co-H-5. The zeolite treated by NaOH solution (AT-HZSM-5) favors the generation of aromatics and phenolics, conversely naphthalene derivatives. Moreover, AT-Mo/Co-H-5 and AT-Ni/Co-H-5 inhibited the coke formation. A catalytic pathway was also proposed to describe the diffusion process of pyrolysis vapors on the active site of catalyst.

中文翻译:

褐煤热解蒸气在单/双金属负载介孔 HZSM-5 上的催化升级

摘要 HZSM-5 采用碱处理和湿浸渍法改性,负载过渡金属(Co、Mo-Co 和 Ni-Co)。在 600 °C 的滴管反应器中测试了用于褐煤催化快速热解的催化剂的性能。与非催化实验相比,焦油改质的化学成分明显简化,主要含有苯、甲苯、乙苯、二甲苯和萘(BTEXN)等轻芳烃。当使用 Ni/Co-H-5 时,BTEXN 的产量从 12.9 显着增加到 26.4 mg/g。同时,用NaOH溶液处理的Ni/Co-H-5比其他方法获得了相当大的脱氧性能(86.6%)。双金属 Mo-Co 或 Ni-Co 的添加显着提高了 HZSM-5 的 BTEXN 选择性。Ni促进气态产物中H 2 的形成并导致萘收率降低。而甲苯和邻二甲苯的产率在热解蒸汽通过 Mo/Co-H-5 后增加。用 NaOH 溶液 (AT-HZSM-5) 处理的沸石有利于生成芳烃和酚类化合物,相反,生成萘衍生物。此外,AT-Mo/Co-H-5 和 AT-Ni/Co-H-5 抑制了焦炭的形成。还提出了一种催化途径来描述热解蒸气在催化剂活性位点上的扩散过程。
更新日期:2018-04-01
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