In situ synthesis of solid base catalysts for the regeneration of degradation products formed during the anthraquinone process for the manufacture of hydrogen peroxide

• Published in: Applied catalysis. A, General Vol. 401; no. 1; pp. 163 - 169
• Main Authors: Guo, Zitian, Feng, Junting, Feng, Yongjun, Evans, David G., Li, Dianqing
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 15.07.2011; Elsevier
• Subjects: Anthraquinone degradation; Anthraquinones; Catalysis; Catalysts; Chemistry; Colloidal state and disperse state; Degradation; Exact sciences and technology; General and physical chemistry; Hydrogen peroxide; In situ synthesis; LDHs; MgAl-LDO; Porous materials; Regeneration; Specific surface; Synthesis; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; LDHs; MgAl-LDO; Regeneration; Anthraquinone degradation; In situ synthesis; Binary compound; Catalyst regeneration; Hydrogen peroxide; In situ; Porous material; Solid; Degradation; Crystallites; Anthraquinone; Synthesis; Efficiency; Ureas; Structure; Aluminium oxide; Scanning electron microscopy; Magnesium oxide; Complexes; X ray diffraction; Base; Mesoporosity; Heterogeneous catalysis; Impregnation; Urea; Layered double hydroxide; Homogeneity; Surface area; Alumina; Degradation product; Catalyst
• ISSN: 0926-860X; 1873-3875
• DOI: 10.1016/j.apcata.2011.05.013

[Display omitted] ► MgAl-LDHs was synthesized on the surface of γ-Al 2O 3 as a catalyst precursor. ► Calcination of MgAl-LDHs/γ-Al 2O 3 precursor, LDO/γ-Al 2O 3 catalyst was obtained. ► The surface basicity of the catalysts increased with increasing LDO loading. ► LDO/γ-Al 2O 3 exhibits high efficiency of anthraquinone degradation regeneration. MgAl–CO 3-layered double hydroxides (MgAl-LDHs) have been synthesized on the surface of spherical γ-Al 2O 3 by an in situ synthesis technique using urea as a precipitant. After calcination, LDH crystallites are transformed into complex metal oxides (LDO) with high homogeneity and MgAl-LDO/γ-Al 2O 3 solid base catalysts containing different LDO content were obtained. X-ray diffraction, scanning electron microscopy, and surface area measurements using the Brunauer–Emmett–Teller method indicated that the MgAl-LDO/γ-Al 2O 3 catalysts possess high specific surface area and rich mesoporous structure. The MgAl-LDO/γ-Al 2O 3 catalysts were used to regenerate anthraquinone degradation products formed in the anthraquinone process for the manufacture of hydrogen peroxide. The efficiency of regeneration of the anthraquinone degradation products was found to increase with increasing LDO loading in the catalysts. Compared with commercial catalysts of NaOH/γ-Al 2O 3 and MgO/γ-Al 2O 3 prepared by the impregnation method, MgAl-LDO/γ-Al 2O 3 catalysts exhibited not only higher activity but also longer life.