Abstract Coal pyrolysis, hydropyrolysis and hydrogasification were performed in a lab-scale pressurized fluidized bed with or without cobalt-calcium bimetallic catalyst (Co-Ca) to preliminarily discern the role of hydropyrolysis, Co-Ca catalyst and H2 in the course of coal catalytic hydrogasification (CCHG). The hydrogasification reactivity and chemical structure of the coal chars generated after hydropyrolysis were also analyzed by means of pressurized thermogravimetric analyzer (P-TGA), FT-Raman and FT-IR, etc. Results indicate that Co-Ca catalyst possesses catalytic depolymerization and hydrogenation effect on coal during hydropyrolysis, which resulted in the promoted yield of CH4, tar and the high hydrogasification reactivity of the generated char. Co-Ca catalyst alone and H2 alone are hardly to fracture the C C bonds in condensed aromatic rings of coal, but the union of them yields a superior bonds cleavage ability. The catalytic cleavage of C C bonds is the crucial step of CCHG at the temperature above 800 °C with the hydrogen pressure above 1 MPa. Moreover, the CCHG process over Co-Ca catalyst is discussed and the probable pathways of the catalytic cleavage of C C bonds are proposed.

中文翻译：

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加压流化床中钴钙催化剂催化煤加氢：加氢热解和催化过程的作用

摘要 煤的热解、加氢热解和加氢在有或无钴钙双金属催化剂（Co-Ca）的实验室加压流化床中进行，初步认识加氢热解、Co-Ca催化剂和H2在煤催化过程中的作用。加氢气化 (CCHG)。还通过加压热重分析仪（P-TGA）、FT-Raman和FT-IR等分析了加氢热解后产生的煤焦的加氢反应活性和化学结构。结果表明Co-Ca催化剂具有催化解聚和加氢作用加氢热解过程中对煤的影响，从而提高了 CH4、焦油的产率和生成的焦炭的高加氢气化反应性。单独使用 Co-Ca 催化剂和单独使用 H2 很难使煤的稠合芳环中的 CC 键断裂，但它们的结合产生了优异的键断裂能力。CC 键的催化裂解是 CCHG 在 800 °C 以上和 1 MPa 以上氢气压力下的关键步骤。此外，讨论了 Co-Ca 催化剂上的 CCHG 过程，并提出了 CC 键催化裂解的可能途径。